update sift to match docstring

Update CHANGELOG for v1.0.2
Fix a data race in Datafile.ReadAt()
2025-01-18 04:03:17 -08:00 · 2022-02-04 02:11:21 -08:00 · 2021-11-01 17:54:39 +10:00 · 2021-11-01 17:54:31 +10:00 · 2021-10-31 07:08:53 +10:00 · 2021-10-31 07:08:01 +10:00
67 changed files with 7284 additions and 1184 deletions
--- a/.chglog/CHANGELOG.tpl.md
+++ b/.chglog/CHANGELOG.tpl.md
@ -0,0 +1,22 @@
+{{ range .Versions }}
+<a name="{{ .Tag.Name }}"></a>
+## {{ if .Tag.Previous }}[{{ .Tag.Name }}]({{ $.Info.RepositoryURL }}/compare/{{ .Tag.Previous.Name }}...{{ .Tag.Name }}){{ else }}{{ .Tag.Name }}{{ end }} ({{ datetime "2006-01-02" .Tag.Date }})
+
+{{ range .CommitGroups -}}
+### {{ .Title }}
+
+{{ range .Commits -}}
+* {{ .Subject }}
+{{ end }}
+{{ end -}}
+
+{{- if .NoteGroups -}}
+{{ range .NoteGroups -}}
+### {{ .Title }}
+
+{{ range .Notes }}
+{{ .Body }}
+{{ end }}
+{{ end -}}
+{{ end -}}
+{{ end -}}
--- a/.chglog/config.yml
+++ b/.chglog/config.yml
@ -0,0 +1,28 @@
+---
+style: Github
+template: CHANGELOG.tpl.md
+info:
+  title: CHANGELOG
+  repository_url: https://git.mills.io/prologic/bitcask
+options:
+  commits:
+    filters:
+      Type:
+        - Add
+        - Fix
+        - Update
+        - Document
+  commit_groups:
+    title_maps:
+      Add: Features
+      Update: Updates
+      Fix: Bug Fixes
+      Document: Documentation
+  header:
+    pattern: "^((\\w+)\\s.*)$"
+    pattern_maps:
+      - Subject
+      - Type
+  notes:
+    keywords:
+      - BREAKING CHANGE
--- a/.drone.yml
+++ b/.drone.yml
@ -1,22 +1,28 @@
+---
 kind: pipeline
 name: default

 steps:
-  - name: build
-    image: golang:latest
+  - name: build & run tests
+    image: r.mills.io/prologic/golang-alpine
    commands:
-      - go test -v -short -cover -coverprofile=coverage.txt ./...
-
-  - name: coverage
-    image: plugins/codecov
-    settings:
-      token:
-        from_secret: codecov-token
+      - make build
+      - make test

  - name: notify
    image: plugins/webhook
-    urls: https://msgbus.mills.io/ci.mills.io
+    settings:
+      urls:
+        - https://msgbus.mills.io/ci.mills.io
    when:
      status:
        - success
        - failure
+
+trigger:
+  branch:
+    - master
+  event:
+    - tag
+    - push
+    - pull_request
--- a/.gitignore
+++ b/.gitignore
@ -1,8 +1,15 @@
 *~*
+*.db
 *.bak
+**.envrc

-/coverage.txt
-/bitcask
-/bitcaskd
 /tmp
 /dist
+/cacheDb
+/coverage.txt
+
+/bitcask
+/bitcaskd
+/bitcask_bench*
+/cmd/bitcask/bitcask
+/cmd/bitcaskd/bitcaskd
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@ -1,34 +1,39 @@
+---
 builds:
-  - 
+  -
+    id: bitcask
    binary: bitcask
    main: ./cmd/bitcask
    flags: -tags "static_build"
-    ldflags: -w -X .Version={{.Version}} -X .Commit={{.Commit}}
+    ldflags: -w -X git.mills.io/prologic/bitcask/internal.Version={{.Version}} -X git.mills.io/prologic/bitcask/internal.Commit={{.Commit}}
    env:
      - CGO_ENABLED=0
-  - 
+    goos:
+      - darwin
+      - linux
+    goarch:
+      - amd64
+      - arm64
+  -
+    id: bitcaskd
    binary: bitcaskd
    main: ./cmd/bitcaskd
    flags: -tags "static_build"
-    ldflags: -w -X .Version={{.Version}} -X .Commit={{.Commit}}
+    ldflags: -w -X git.mills.io/prologic/bitcask/internal.Version={{.Version}} -X git.mills.io/prologic/bitcask/internal.Commit={{.Commit}}
    env:
      - CGO_ENABLED=0
-sign:
-  artifacts: checksum
-archive:
-  replacements:
-    darwin: Darwin
-    linux: Linux
-    windows: Windows
-    386: i386
-    amd64: x86_64
-checksum:
-  name_template: 'checksums.txt'
-snapshot:
-  name_template: "{{ .Tag }}-next"
-changelog:
-  sort: asc
-  filters:
-    exclude:
-    - '^docs:'
-    - '^test:'
+    goos:
+      - darwin
+      - linux
+    goarch:
+      - amd64
+      - arm64
+signs:
+  - artifacts: checksum
+release:
+  gitea:
+    owner: prologic
+    name: bitcask
+  draft: true
+gitea_urls:
+  api: https://git.mills.io/api/v1/
--- a/21
+++ b/21
@ -0,0 +1,21 @@
+# Entries should be added alphabetically in the form:
+#   Name or Organization <email address>
+# The email address is not required for organizations.
+
+Alain Gilbert <alain.gilbert.15@gmail.com>
+Awn Umar <awn@spacetime.dev>
+Bryan Stenson <bryan@siliconvortex.com>
+Christian Muehlhaeuser <muesli@gmail.com>
+Ignacio Hagopian <jsign.uy@gmail.com>
+James Mills <prologic@shortcircuit.net.au>
+Jesse Donat <donatj@gmail.com>
+Kebert Xela kebertxela
+panyun panyun 
+shiniao <zhuzhezhe95@gmail.com>
+Whemoon Jang <palindrom615@gmail.com>
+Yash Chandra <yashschandra@gmail.com>
+Yury Fedorov orlangure
+o2gy84 <o2gy84@gmail.com>
+garsue <labs.garsue@gmail.com>
+biozz <ielfimov@gmail.com>
+jason3gb <jason3gb@gmail.com>
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -0,0 +1,501 @@
+
+<a name="v1.0.2"></a>
+## [v1.0.2](https://git.mills.io/prologic/bitcask/compare/v1.0.1...v1.0.2) (2021-11-01)
+
+### Bug Fixes
+
+* Fix a data race in Datafile.ReadAt()
+* Fix release tool
+
+
+<a name="v1.0.1"></a>
+## [v1.0.1](https://git.mills.io/prologic/bitcask/compare/v1.0.0...v1.0.1) (2021-10-31)
+
+### Features
+
+* Add ErrBadConfig and ErrBadMetadata as errors that consumers can check and use (#241)
+* Add key prefix matching to KEYS command (#237)
+
+### Updates
+
+* Update CHANGELOG for v1.0.1
+* Update image target
+
+
+<a name="v1.0.0"></a>
+## [v1.0.0](https://git.mills.io/prologic/bitcask/compare/1.0.0...v1.0.0) (2021-07-24)
+
+### Updates
+
+* Update CHANGELOG for v1.0.0
+
+
+<a name="1.0.0"></a>
+## [1.0.0](https://git.mills.io/prologic/bitcask/compare/v0.3.14...1.0.0) (2021-07-24)
+
+### Updates
+
+* Update CHANGELOG for 1.0.0
+* Update README
+
+
+<a name="v0.3.14"></a>
+## [v0.3.14](https://git.mills.io/prologic/bitcask/compare/v0.3.13...v0.3.14) (2021-07-21)
+
+### Bug Fixes
+
+* Fix runGC behaviour to correctly delete all expired keys (#229)
+* Fix missing push event
+* Fix how CI is triggered
+* Fix README Go Reference badge
+* Fix README badges
+
+### Features
+
+* Add RangeScan() support (#160)
+
+### Updates
+
+* Update CHANGELOG for v0.3.14
+
+
+<a name="v0.3.13"></a>
+## [v0.3.13](https://git.mills.io/prologic/bitcask/compare/v0.3.12...v0.3.13) (2021-07-16)
+
+### Bug Fixes
+
+* Fix paths used for temporary recovery iles to avoid crossing devices (#223)
+
+### Features
+
+* Add Drone CI config
+
+### Updates
+
+* Update CHANGELOG for v0.3.13
+
+
+<a name="v0.3.12"></a>
+## [v0.3.12](https://git.mills.io/prologic/bitcask/compare/v0.3.11...v0.3.12) (2021-07-13)
+
+### Updates
+
+* Update CHANGELOG for v0.3.12
+
+
+<a name="v0.3.11"></a>
+## [v0.3.11](https://git.mills.io/prologic/bitcask/compare/v0.3.10...v0.3.11) (2021-07-10)
+
+### Bug Fixes
+
+* Fix missing go.sum entries
+* Fix GoReleaser config
+* Fix go.sum
+
+### Documentation
+
+* Document good and possibly poor use-cases of Bitcask (#199)
+
+### Features
+
+* Add support for keys with ttl (#177)
+
+### Updates
+
+* Update CHANGELOG for v0.3.11
+
+
+<a name="v0.3.10"></a>
+## [v0.3.10](https://git.mills.io/prologic/bitcask/compare/v0.3.9...v0.3.10) (2020-12-18)
+
+### Bug Fixes
+
+* Fix a bug when MaxValueSize == 0 on Merge operations
+* Fix link to bitcask-bench
+* Fix CI (again)
+* Fix CI
+
+### Features
+
+* Add support for unlimited key/value sizes
+* Add a few more test cases for concurrent operations
+
+### Updates
+
+* Update CHANGELOG for v0.3.10
+* Update README.md
+
+
+<a name="v0.3.9"></a>
+## [v0.3.9](https://git.mills.io/prologic/bitcask/compare/v0.3.8...v0.3.9) (2020-11-17)
+
+### Bug Fixes
+
+* Fix a race condition around .Close() and .Sync()
+
+### Updates
+
+* Update CHANGELOG for v0.3.9
+
+
+<a name="v0.3.8"></a>
+## [v0.3.8](https://git.mills.io/prologic/bitcask/compare/v0.3.7...v0.3.8) (2020-11-17)
+
+### Updates
+
+* Update CHANGELOG for v0.3.8
+
+
+<a name="v0.3.7"></a>
+## [v0.3.7](https://git.mills.io/prologic/bitcask/compare/v0.3.6...v0.3.7) (2020-11-17)
+
+### Updates
+
+* Update CHANGELOG for v0.3.7
+
+
+<a name="v0.3.6"></a>
+## [v0.3.6](https://git.mills.io/prologic/bitcask/compare/v0.3.5...v0.3.6) (2020-11-17)
+
+### Bug Fixes
+
+* Fix typo in labeler (#172)
+* Fix builds configuration for goreleaser
+* Fix (again) goreleaser config
+* Fix goreleaser config and improve release notes / changelog
+* Fix recoverDatafile error covering (#162)
+* Fix loadIndex to be deterministic (#115)
+
+### Features
+
+* Add configuration options for FileMode (#183)
+* Add imports and log in example code (#182)
+* Add empty changelog
+* Add DependaBot config
+* Add DeleteAll function (#116)
+
+### Updates
+
+* Update CHANGELOG for v0.3.6
+* Update README.md
+* Update CHANGELOG for v0.3.6
+* Update CHANGELOG for v0.3.6
+* Update deps (#140)
+* Update README.md
+
+
+<a name="v0.3.5"></a>
+## [v0.3.5](https://git.mills.io/prologic/bitcask/compare/v0.3.4...v0.3.5) (2019-10-20)
+
+### Bug Fixes
+
+* Fix setup target in Makefile to install mockery correctly
+* Fix glfmt/golint issues
+* Fix spelling mistake in README s/Sponser/Sponsor
+
+### Features
+
+* Add *.db to ignore future accidental commits of a bitcask db to the repo
+* Add unit test for opening bad database with corrupted/invalid datafiles (#105)
+
+### Updates
+
+* Update Drone CI test pipeline
+* Update README.md
+* Update to Go 1.13 and update README with new benchmarks (#89)
+* Update README.md
+
+
+<a name="v0.3.4"></a>
+## [v0.3.4](https://git.mills.io/prologic/bitcask/compare/v0.3.3...v0.3.4) (2019-09-02)
+
+
+<a name="v0.3.3"></a>
+## [v0.3.3](https://git.mills.io/prologic/bitcask/compare/v0.3.2...v0.3.3) (2019-09-02)
+
+### Bug Fixes
+
+* Fix a bug wit the decoder passing the wrong value for the value's offset into the buffer (#77)
+* Fix typo (#65)
+* Fix and cleanup some unnecessary internal sub-packages and duplication
+
+### Updates
+
+* Update README.md
+* Update README.md
+* Update README.md
+* Update README.md
+
+
+<a name="v0.3.2"></a>
+## [v0.3.2](https://git.mills.io/prologic/bitcask/compare/v0.3.1...v0.3.2) (2019-08-08)
+
+### Updates
+
+* Update README.md
+* Update README.md
+* Update CONTRIBUTING.md
+
+
+<a name="v0.3.1"></a>
+## [v0.3.1](https://git.mills.io/prologic/bitcask/compare/v0.3.0...v0.3.1) (2019-08-05)
+
+### Updates
+
+* Update README.md
+* Update README.md
+* Update README.md
+
+
+<a name="v0.3.0"></a>
+## [v0.3.0](https://git.mills.io/prologic/bitcask/compare/v0.2.2...v0.3.0) (2019-07-29)
+
+### Updates
+
+* Update README.md
+* Update README.md
+
+
+<a name="v0.2.2"></a>
+## [v0.2.2](https://git.mills.io/prologic/bitcask/compare/v0.2.1...v0.2.2) (2019-07-27)
+
+
+<a name="v0.2.1"></a>
+## [v0.2.1](https://git.mills.io/prologic/bitcask/compare/v0.2.0...v0.2.1) (2019-07-25)
+
+
+<a name="v0.2.0"></a>
+## [v0.2.0](https://git.mills.io/prologic/bitcask/compare/v0.1.7...v0.2.0) (2019-07-25)
+
+### Bug Fixes
+
+* Fix issue(db file Merge issue in windows env): (#15)
+
+
+<a name="v0.1.7"></a>
+## [v0.1.7](https://git.mills.io/prologic/bitcask/compare/v0.1.6...v0.1.7) (2019-07-19)
+
+### Bug Fixes
+
+* Fix mismatched key casing. (#12)
+* Fix outdated README (#11)
+* Fix typos in bitcask.go docs (#10)
+
+### Updates
+
+* Update generated protobuf code
+* Update README.md
+
+
+<a name="v0.1.6"></a>
+## [v0.1.6](https://git.mills.io/prologic/bitcask/compare/v0.1.5...v0.1.6) (2019-04-01)
+
+### Features
+
+* Add Development section to README documenting use of Protobuf and tooling required. #6
+* Add other badges from img.shields.io
+
+
+<a name="v0.1.5"></a>
+## [v0.1.5](https://git.mills.io/prologic/bitcask/compare/v0.1.4...v0.1.5) (2019-03-30)
+
+### Documentation
+
+* Document using the Docker Image
+
+### Features
+
+* Add Dockerfile to publish images to Docker Hub
+
+### Updates
+
+* Update README.md
+
+
+<a name="v0.1.4"></a>
+## [v0.1.4](https://git.mills.io/prologic/bitcask/compare/v0.1.3...v0.1.4) (2019-03-23)
+
+
+<a name="v0.1.3"></a>
+## [v0.1.3](https://git.mills.io/prologic/bitcask/compare/v0.1.2...v0.1.3) (2019-03-23)
+
+
+<a name="v0.1.2"></a>
+## [v0.1.2](https://git.mills.io/prologic/bitcask/compare/v0.1.1...v0.1.2) (2019-03-22)
+
+
+<a name="v0.1.1"></a>
+## [v0.1.1](https://git.mills.io/prologic/bitcask/compare/v0.1.0...v0.1.1) (2019-03-22)
+
+
+<a name="v0.1.0"></a>
+## [v0.1.0](https://git.mills.io/prologic/bitcask/compare/0.0.26...v0.1.0) (2019-03-22)
+
+
+<a name="0.0.26"></a>
+## [0.0.26](https://git.mills.io/prologic/bitcask/compare/0.0.25...0.0.26) (2019-03-21)
+
+### Features
+
+* Add docs for bitcask
+* Add docs for options
+* Add KeYS command to server (bitraftd)
+* Add Len() to exported API (extended API)
+* Add Keys() to exported API (extended API)
+* Add EXISTS command to server (bitraftd)
+
+
+<a name="0.0.25"></a>
+## [0.0.25](https://git.mills.io/prologic/bitcask/compare/0.0.24...0.0.25) (2019-03-21)
+
+### Features
+
+* Add Has() to exported API (extended API)
+* Add MergeOpen test case
+
+### Updates
+
+* Update README.md
+* Update README.md
+
+
+<a name="0.0.24"></a>
+## [0.0.24](https://git.mills.io/prologic/bitcask/compare/0.0.23...0.0.24) (2019-03-20)
+
+
+<a name="0.0.23"></a>
+## [0.0.23](https://git.mills.io/prologic/bitcask/compare/0.0.22...0.0.23) (2019-03-20)
+
+### Features
+
+* Add bitcaskd to install target
+
+
+<a name="0.0.22"></a>
+## [0.0.22](https://git.mills.io/prologic/bitcask/compare/0.0.21...0.0.22) (2019-03-18)
+
+
+<a name="0.0.21"></a>
+## [0.0.21](https://git.mills.io/prologic/bitcask/compare/0.0.20...0.0.21) (2019-03-18)
+
+
+<a name="0.0.20"></a>
+## [0.0.20](https://git.mills.io/prologic/bitcask/compare/0.0.19...0.0.20) (2019-03-17)
+
+
+<a name="0.0.19"></a>
+## [0.0.19](https://git.mills.io/prologic/bitcask/compare/0.0.18...0.0.19) (2019-03-17)
+
+
+<a name="0.0.18"></a>
+## [0.0.18](https://git.mills.io/prologic/bitcask/compare/0.0.17...0.0.18) (2019-03-16)
+
+
+<a name="0.0.17"></a>
+## [0.0.17](https://git.mills.io/prologic/bitcask/compare/0.0.16...0.0.17) (2019-03-16)
+
+### Features
+
+* Add CRC Checksum checks on reading values back
+
+
+<a name="0.0.16"></a>
+## [0.0.16](https://git.mills.io/prologic/bitcask/compare/0.0.15...0.0.16) (2019-03-16)
+
+
+<a name="0.0.15"></a>
+## [0.0.15](https://git.mills.io/prologic/bitcask/compare/0.0.14...0.0.15) (2019-03-16)
+
+### Bug Fixes
+
+* Fix a race condition + Use my fork of trie
+
+
+<a name="0.0.14"></a>
+## [0.0.14](https://git.mills.io/prologic/bitcask/compare/0.0.13...0.0.14) (2019-03-16)
+
+
+<a name="0.0.13"></a>
+## [0.0.13](https://git.mills.io/prologic/bitcask/compare/0.0.12...0.0.13) (2019-03-16)
+
+### Features
+
+* Add prefix scan for keys using a Trie
+
+
+<a name="0.0.12"></a>
+## [0.0.12](https://git.mills.io/prologic/bitcask/compare/0.0.11...0.0.12) (2019-03-14)
+
+
+<a name="0.0.11"></a>
+## [0.0.11](https://git.mills.io/prologic/bitcask/compare/0.0.10...0.0.11) (2019-03-14)
+
+### Updates
+
+* Update README.md
+
+
+<a name="0.0.10"></a>
+## [0.0.10](https://git.mills.io/prologic/bitcask/compare/0.0.9...0.0.10) (2019-03-14)
+
+### Bug Fixes
+
+* Fix concurrent read bug
+* Fix concurrent write bug with multiple goroutines writing to the to the active datafile
+
+### Updates
+
+* Update README.md
+
+
+<a name="0.0.9"></a>
+## [0.0.9](https://git.mills.io/prologic/bitcask/compare/0.0.8...0.0.9) (2019-03-14)
+
+
+<a name="0.0.8"></a>
+## [0.0.8](https://git.mills.io/prologic/bitcask/compare/0.0.7...0.0.8) (2019-03-13)
+
+
+<a name="0.0.7"></a>
+## [0.0.7](https://git.mills.io/prologic/bitcask/compare/0.0.6...0.0.7) (2019-03-13)
+
+
+<a name="0.0.6"></a>
+## [0.0.6](https://git.mills.io/prologic/bitcask/compare/0.0.5...0.0.6) (2019-03-13)
+
+### Bug Fixes
+
+* Fix usage output of bitcaskd
+
+
+<a name="0.0.5"></a>
+## [0.0.5](https://git.mills.io/prologic/bitcask/compare/0.0.4...0.0.5) (2019-03-13)
+
+### Features
+
+* Add a simple Redis compatible server daemon (bitcaskd)
+
+### Updates
+
+* Update README.md
+
+
+<a name="0.0.4"></a>
+## [0.0.4](https://git.mills.io/prologic/bitcask/compare/0.0.3...0.0.4) (2019-03-13)
+
+### Features
+
+* Add flock on database Open()/Close() to prevent multiple concurrent processes write access. Fixes #2
+
+
+<a name="0.0.3"></a>
+## [0.0.3](https://git.mills.io/prologic/bitcask/compare/0.0.2...0.0.3) (2019-03-13)
+
+
+<a name="0.0.2"></a>
+## [0.0.2](https://git.mills.io/prologic/bitcask/compare/0.0.1...0.0.2) (2019-03-13)
+
+
+<a name="0.0.1"></a>
+## 0.0.1 (2019-03-13)
+
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@ -0,0 +1,12 @@
+# Contributing
+
+No preference. If you know how to use Github and have contributed to open source projects before then:
+
+* File an issue
+* Submit a pull request
+* File an issue + Submit a pull request
+* Use this project somewhere :)
+
+Be sure to add yourself to the [AUTHORS](/AUTHORS) file when you submit your PR(s). Every contribution counts no how big or small!
+
+Thanks for using Bitcask!
--- a/14
+++ b/14
@ -0,0 +1,14 @@
+# Build
+FROM prologic/go-builder:latest AS build
+
+# Runtime
+FROM alpine
+
+COPY --from=build /src/bitcaskd /bitcaskd
+
+EXPOSE 6379/tcp
+
+VOLUME /data
+
+ENTRYPOINT ["/bitcaskd"]
+CMD ["/data"]
--- a/31
+++ b/31
@ -1,4 +1,4 @@
-.PHONY: dev build generate install image release profile bench test clean
+.PHONY: dev build generate install image release profile bench test clean setup

 CGO_ENABLED=0
 VERSION=$(shell git describe --abbrev=0 --tags)
@ -13,11 +13,11 @@ dev: build
 build: clean generate
 	@go build \
 		-tags "netgo static_build" -installsuffix netgo \
-		-ldflags "-w -X $(shell go list).Version=$(VERSION) -X $(shell go list).Commit=$(COMMIT)" \
+		-ldflags "-w -X $(shell go list)/internal.Version=$(VERSION) -X $(shell go list)/internal.Commit=$(COMMIT)" \
 		./cmd/bitcask/...
 	@go build \
 		-tags "netgo static_build" -installsuffix netgo \
-		-ldflags "-w -X $(shell go list).Version=$(VERSION) -X $(shell go list).Commit=$(COMMIT)" \
+		-ldflags "-w -X $(shell go list)/internal.Version=$(VERSION) -X $(shell go list)/internal.Commit=$(COMMIT)" \
 		./cmd/bitcaskd/...

 generate:
@ -25,21 +25,38 @@ generate:

 install: build
 	@go install ./cmd/bitcask/...
+	@go install ./cmd/bitcaskd/...

+ifeq ($(PUBLISH), 1)
 image:
-	@docker build -t prologic/bitcask .
+	@docker build --build-arg VERSION="$(VERSION)" --build-arg COMMIT="$(COMMIT)" -t prologic/bitcask .
+	@docker push prologic/bitcask
+else
+image:
+	@docker build --build-arg VERSION="$(VERSION)" --build-arg COMMIT="$(COMMIT)" -t prologic/bitcask .
+endif

 release:
 	@./tools/release.sh

 profile: build
-	@go test -cpuprofile cpu.prof -memprofile mem.prof -v -bench ./...
+	@go test -cpuprofile cpu.prof -memprofile mem.prof -v -bench .

 bench: build
-	@go test -v -benchmem -bench=. ./...
+	@go test -v -run=XXX -benchmem -bench=. .
+
+mocks:
+	@mockery -all -case underscore -output ./internal/mocks -recursive

 test: build
-	@go test -v -cover -coverprofile=coverage.txt -covermode=atomic -coverpkg=./... -race ./...
+	@go test -v \
+		-cover -coverprofile=coverage.txt -covermode=atomic \
+		-coverpkg=$(shell go list) \
+		-race \
+		.
+
+setup:
+	@go get github.com/vektra/mockery/...

 clean:
 	@git clean -f -d -X
--- a/README.md
+++ b/README.md
@ -1,58 +1,120 @@
 # bitcask

-[![Build Status](https://cloud.drone.io/api/badges/prologic/bitcask/status.svg)](https://cloud.drone.io/prologic/bitcask)
-[![CodeCov](https://codecov.io/gh/prologic/bitcask/branch/master/graph/badge.svg)](https://codecov.io/gh/prologic/bitcask)
-[![Go Report Card](https://goreportcard.com/badge/prologic/bitcask)](https://goreportcard.com/report/prologic/bitcask)
-[![GoDoc](https://godoc.org/github.com/prologic/bitcask?status.svg)](https://godoc.org/github.com/prologic/bitcask) 
-[![Sourcegraph](https://sourcegraph.com/github.com/prologic/bitcask/-/badge.svg)](https://sourcegraph.com/github.com/prologic/bitcask?badge)
+[![Build Status](https://ci.mills.io/api/badges/prologic/bitcask/status.svg)](https://ci.mills.io/prologic/bitcask)
+[![Go Report Card](https://goreportcard.com/badge/git.mills.io/prologic/bitcask)](https://goreportcard.com/report/git.mills.io/prologic/bitcask)
+[![Go Reference](https://pkg.go.dev/badge/git.mills.io/prologic/bitcask.svg)](https://pkg.go.dev/git.mills.io/prologic/bitcask)

-A Bitcask (LSM+WAL) Key/Value Store written in Go.
+A high performance Key/Value store written in [Go](https://golang.org) with a predictable read/write performance and high throughput. Uses a [Bitcask](https://en.wikipedia.org/wiki/Bitcask) on-disk layout (LSM+WAL) similar to [Riak](https://riak.com/)
+
+For a more feature-complete Redis-compatible server, distributed key/value store have a look at [Bitraft](https://git.mills.io/prologic/bitraft) which uses this library as its backend. Use [Bitcask](https://git.mills.io/prologic/bitcask) as a starting point or if you want to embed in your application, use [Bitraft](https://git.mills.io/prologic/bitraft) if you need a complete server/client solution with high availability with a Redis-compatible API.

 ## Features

-* Embeddable
-* Builtin CLI
-* Builtin Redis-compatible server
+* Embedded (`import "git.mills.io/prologic/bitcask"`)
+* Builtin CLI (`bitcask`)
+* Builtin Redis-compatible server (`bitcaskd`)
 * Predictable read/write performance
-* Low latecny
-* High throughput (See: [Performance](README.md#Performance)
+* Low latency
+* High throughput (See: [Performance](README.md#Performance) )
+
+## Is Bitcask right for my project?
+
+__NOTE__: Please read this carefully to identify whether using Bitcask is
+          suitable for your needs.
+
+`bitcask` is a **great fit** for:
+
+- Storing hundreds of thousands to millions of key/value pairs based on
+  default configuration. With the default configuration (_configurable_)
+  of 64 bytes per key and 64kB values, 1M keys would consume roughly ~600-700MB
+  of memory ~65-70GB of disk storage. These are all configurable when you
+  create a new database with `bitcask.Open(...)` with functional-style options
+  you can pass with `WithXXX()`.
+
+- As the backing store to a distributed key/value store. See for example the
+  [bitraft](https://git.mills.io/prologic/bitraft) as an example of this.
+
+- For high performance, low latency read/write workloads where you cannot fit
+  a typical hash-map into memory, but require the highest level of performance
+  and predicate read latency. Bitcask ensures only 1 read/write IOPS are ever
+  required for reading and writing key/value pairs.
+
+- As a general purpose embedded key/value store where you would have used
+  [BoltDB](https://github.com/boltdb/bolt),
+  [LevelDB](https://github.com/syndtr/goleveldb),
+  [BuntDB](https://github.com/tidwall/buntdb)
+  or similar...
+
+`bitcask` is not suited for:
+
+- Storing billions of records
+  The reason for this is the key-space is held in memory using a highly
+  performant and memory optimized adaptive radix tree thanks to
+  [go-adaptive-radix-tree](github.com/plar/go-adaptive-radix-tree) _however_
+  this means the more keys you have in your key space, the more memory is
+  consumed. Consider using a disk-backed B-Tree like [BoltDB](https://github.com/boltdb/bolt)
+  or [LevelDB](https://github.com/syndtr/goleveldb) if you intend to store a
+  large quantity of key/value pairs.
+
+> Note however that storing large amounts of data in terms of value(s) is
+> totally fine. In other wise thousands to millions of keys with large values
+> will work just fine.
+
+- Write intensive workloads. Due to the [Bitcask design](https://riak.com/assets/bitcask-intro.pdf?source=post_page---------------------------)
+  heavy write workloads that lots of key/value pairs will over time cause
+  problems like "Too many open files" (#193) errors to occur. This can be mitigated by
+  periodically compacting the data files by issuing a `.Merge()` operation however
+  if key/value pairs do not change or are never deleted, as-in only new key/value
+  pairs are ever written this will have no effect. Eventually you will run out
+  of file descriptors!
+
+> You should consider your read/write workloads carefully and ensure you set
+> appropriate file descriptor limits with `ulimit -n` that suit your needs.
+
+## Development
+
+```sh
+$ git clone https://git.mills.io/prologic/bitcask.git
+$ make
+```

 ## Install

-```#!bash
-$ go get github.com/prologic/bitcask
+```sh
+$ go get git.mills.io/prologic/bitcask
 ```

 ## Usage (library)

 Install the package into your project:

-```#!bash
-$ go get github.com/prologic/bitcask
+```sh
+$ go get git.mills.io/prologic/bitcask
 ```

-```#!go
+```go
 package main

 import (
-    "log"
-
-    "github.com/prologic/bitcask"
+	"log"
+	"git.mills.io/prologic/bitcask"
 )

 func main() {
    db, _ := bitcask.Open("/tmp/db")
-    db.Set("Hello", []byte("World"))
-    db.Close()
+    defer db.Close()
+    db.Put([]byte("Hello"), []byte("World"))
+    val, _ := db.Get([]byte("Hello"))
+    log.Printf(string(val))
 }
 ```

-See the [godoc](https://godoc.org/github.com/prologic/bitcask) for further
+See the [GoDoc](https://godoc.org/git.mills.io/prologic/bitcask) for further
 documentation and other examples.

 ## Usage (tool)

-```#!bash
+```sh
 $ bitcask -p /tmp/db set Hello World
 $ bitcask -p /tmp/db get Hello
 World
@ -62,14 +124,14 @@ World

 There is also a builtin very  simple Redis-compatible server called `bitcaskd`:

-```#!bash
+```sh
 $ ./bitcaskd ./tmp
 INFO[0000] starting bitcaskd v0.0.7@146f777              bind=":6379" path=./tmp
 ```

 Example session:

-```
+```sh
 $ telnet localhost 6379
 Trying ::1...
 Connected to localhost.
@ -90,43 +152,89 @@ QUIT
 Connection closed by foreign host.
 ```

+## Docker
+
+You can also use the [Bitcask Docker Image](https://cloud.docker.com/u/prologic/repository/docker/prologic/bitcask):
+
+```sh
+$ docker pull prologic/bitcask
+$ docker run -d -p 6379:6379 prologic/bitcask
+```
+
 ## Performance

-Benchmarks run on a 11" Macbook with a 1.4Ghz Intel Core i7:
+Benchmarks run on a 11" MacBook with a 1.4Ghz Intel Core i7:

-```
+```sh
 $ make bench
 ...
-BenchmarkGet/128B-4         	  300000	      5178 ns/op	     400 B/op	       5 allocs/op
-BenchmarkGet/256B-4         	  300000	      5273 ns/op	     656 B/op	       5 allocs/op
-BenchmarkGet/512B-4         	  200000	      5368 ns/op	    1200 B/op	       5 allocs/op
-BenchmarkGet/1K-4           	  200000	      5800 ns/op	    2288 B/op	       5 allocs/op
-BenchmarkGet/2K-4           	  200000	      6766 ns/op	    4464 B/op	       5 allocs/op
-BenchmarkGet/4K-4           	  200000	      7857 ns/op	    9072 B/op	       5 allocs/op
-BenchmarkGet/8K-4           	  200000	      9538 ns/op	   17776 B/op	       5 allocs/op
-BenchmarkGet/16K-4          	  100000	     13188 ns/op	   34928 B/op	       5 allocs/op
-BenchmarkGet/32K-4          	  100000	     21620 ns/op	   73840 B/op	       5 allocs/op
+goos: darwin
+goarch: amd64
+pkg: git.mills.io/prologic/bitcask

-BenchmarkPut/128B-4         	  200000	      7875 ns/op	     409 B/op	       6 allocs/op
-BenchmarkPut/256B-4         	  200000	      8712 ns/op	     538 B/op	       6 allocs/op
-BenchmarkPut/512B-4         	  200000	      9832 ns/op	     829 B/op	       6 allocs/op
-BenchmarkPut/1K-4           	  100000	     13105 ns/op	    1410 B/op	       6 allocs/op
-BenchmarkPut/2K-4           	  100000	     18601 ns/op	    2572 B/op	       6 allocs/op
-BenchmarkPut/4K-4           	   50000	     36631 ns/op	    5151 B/op	       6 allocs/op
-BenchmarkPut/8K-4           	   30000	     56128 ns/op	    9798 B/op	       6 allocs/op
-BenchmarkPut/16K-4          	   20000	     83209 ns/op	   18834 B/op	       6 allocs/op
-BenchmarkPut/32K-4          	   10000	    135899 ns/op	   41517 B/op	       6 allocs/op
+BenchmarkGet/128B-4         	  316515	      3263 ns/op	  39.22 MB/s	     160 B/op	       1 allocs/op
+BenchmarkGet/256B-4         	  382551	      3204 ns/op	  79.90 MB/s	     288 B/op	       1 allocs/op
+BenchmarkGet/512B-4         	  357216	      3835 ns/op	 133.51 MB/s	     576 B/op	       1 allocs/op
+BenchmarkGet/1K-4           	  274958	      4429 ns/op	 231.20 MB/s	    1152 B/op	       1 allocs/op
+BenchmarkGet/2K-4           	  227764	      5013 ns/op	 408.55 MB/s	    2304 B/op	       1 allocs/op
+BenchmarkGet/4K-4           	  187557	      5534 ns/op	 740.15 MB/s	    4864 B/op	       1 allocs/op
+BenchmarkGet/8K-4           	  153546	      7652 ns/op	1070.56 MB/s	    9472 B/op	       1 allocs/op
+BenchmarkGet/16K-4          	  115549	     10272 ns/op	1594.95 MB/s	   18432 B/op	       1 allocs/op
+BenchmarkGet/32K-4          	   69592	     16405 ns/op	1997.39 MB/s	   40960 B/op	       1 allocs/op

-BenchmarkScan-4             	 1000000	      1851 ns/op	     493 B/op	      25 allocs/op
+BenchmarkPut/128BNoSync-4   	  123519	     11094 ns/op	  11.54 MB/s	      49 B/op	       2 allocs/op
+BenchmarkPut/256BNoSync-4   	   84662	     13398 ns/op	  19.11 MB/s	      50 B/op	       2 allocs/op
+BenchmarkPut/1KNoSync-4     	   46345	     24855 ns/op	  41.20 MB/s	      58 B/op	       2 allocs/op
+BenchmarkPut/2KNoSync-4     	   28820	     43817 ns/op	  46.74 MB/s	      68 B/op	       2 allocs/op
+BenchmarkPut/4KNoSync-4     	   13976	     90059 ns/op	  45.48 MB/s	      89 B/op	       2 allocs/op
+BenchmarkPut/8KNoSync-4     	    7852	    155101 ns/op	  52.82 MB/s	     130 B/op	       2 allocs/op
+BenchmarkPut/16KNoSync-4    	    4848	    238113 ns/op	  68.81 MB/s	     226 B/op	       2 allocs/op
+BenchmarkPut/32KNoSync-4    	    2564	    391483 ns/op	  83.70 MB/s	     377 B/op	       3 allocs/op
+
+BenchmarkPut/128BSync-4     	     260	   4611273 ns/op	   0.03 MB/s	      48 B/op	       2 allocs/op
+BenchmarkPut/256BSync-4     	     265	   4665506 ns/op	   0.05 MB/s	      48 B/op	       2 allocs/op
+BenchmarkPut/1KSync-4       	     256	   4757334 ns/op	   0.22 MB/s	      48 B/op	       2 allocs/op
+BenchmarkPut/2KSync-4       	     255	   4996788 ns/op	   0.41 MB/s	      92 B/op	       2 allocs/op
+BenchmarkPut/4KSync-4       	     222	   5136481 ns/op	   0.80 MB/s	      98 B/op	       2 allocs/op
+BenchmarkPut/8KSync-4       	     223	   5530824 ns/op	   1.48 MB/s	      99 B/op	       2 allocs/op
+BenchmarkPut/16KSync-4      	     213	   5717880 ns/op	   2.87 MB/s	     202 B/op	       2 allocs/op
+BenchmarkPut/32KSync-4      	     211	   5835948 ns/op	   5.61 MB/s	     355 B/op	       3 allocs/op
+
+BenchmarkScan-4             	  568696	      2036 ns/op	     392 B/op	      33 allocs/op
+PASS
 ```

 For 128B values:

-* ~200,000 reads/sec
-* ~130,000 writes/sec
+* ~300,000 reads/sec
+* ~90,000 writes/sec
+* ~490,000 scans/sec

 The full benchmark above shows linear performance as you increase key/value sizes.

+## Support
+
+Support the ongoing development of Bitcask!
+
+**Sponsor**
+
+- Become a [Sponsor](https://www.patreon.com/prologic)
+
+## Contributors
+
+Thank you to all those that have contributed to this project, battle-tested it,
+used it in their own projects or products, fixed bugs, improved performance
+and even fix tiny typos in documentation! Thank you and keep contributing!
+
+You can find an [AUTHORS](/AUTHORS) file where we keep a list of contributors
+to the project. If you contribute a PR please consider adding your name there.
+
+## Related Projects
+
+- [bitraft](https://git.mills.io/prologic/bitraft) -- A Distributed Key/Value store (_using Raft_) with a Redis compatible protocol.
+- [bitcaskfs](https://git.mills.io/prologic/bitcaskfs) -- A FUSE file system for mounting a Bitcask database.
+- [bitcask-bench](https://git.mills.io/prologic/bitcask-bench) -- A benchmarking tool comparing Bitcask and several other Go key/value libraries.
+
 ## License

-bitcask is licensed under the [MIT License](https://github.com/prologic/bitcask/blob/master/LICENSE)
+bitcask is licensed under the term of the [MIT License](https://git.mills.io/prologic/bitcask/blob/master/LICENSE)
--- a/bitcask.go
+++ b/bitcask.go
--- a/bitcask_test.go
+++ b/bitcask_test.go
--- a/cmd/bitcask/del.go
+++ b/cmd/bitcask/del.go
@ -7,7 +7,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

-	"github.com/prologic/bitcask"
+	"git.mills.io/prologic/bitcask"
 )

 var delCmd = &cobra.Command{
@ -37,7 +37,7 @@ func del(path, key string) int {
 	}
 	defer db.Close()

-	err = db.Delete(key)
+	err = db.Delete([]byte(key))
 	if err != nil {
 		log.WithError(err).Error("error deleting key")
 		return 1
--- a/cmd/bitcask/export.go
+++ b/cmd/bitcask/export.go
@ -0,0 +1,138 @@
+package main
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"io"
+	"os"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+
+	"git.mills.io/prologic/bitcask"
+)
+
+var errNotAllDataWritten = errors.New("error: not all data written")
+
+var exportCmd = &cobra.Command{
+	Use:     "export",
+	Aliases: []string{"backup", "dump"},
+	Short:   "Export a database",
+	Long: `This command allows you to export or dump/backup a database's
+key/values into a long-term portable archival format suitable for backup and
+restore purposes or migrating from older on-disk formats of Bitcask.
+
+All key/value pairs are base64 encoded and serialized as JSON one pair per
+line to form an output stream to either standard output or a file. You can
+optionally compress the output with standard compression tools such as gzip.`,
+	Args: cobra.RangeArgs(0, 1),
+	Run: func(cmd *cobra.Command, args []string) {
+		var output string
+
+		path := viper.GetString("path")
+
+		if len(args) == 1 {
+			output = args[0]
+		} else {
+			output = "-"
+		}
+
+		os.Exit(export(path, output))
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(exportCmd)
+
+	exportCmd.PersistentFlags().IntP(
+		"with-max-datafile-size", "", bitcask.DefaultMaxDatafileSize,
+		"Maximum size of each datafile",
+	)
+	exportCmd.PersistentFlags().Uint32P(
+		"with-max-key-size", "", bitcask.DefaultMaxKeySize,
+		"Maximum size of each key",
+	)
+	exportCmd.PersistentFlags().Uint64P(
+		"with-max-value-size", "", bitcask.DefaultMaxValueSize,
+		"Maximum size of each value",
+	)
+}
+
+type kvPair struct {
+	Key   string `json:"key"`
+	Value string `json:"value"`
+}
+
+func export(path, output string) int {
+	db, err := bitcask.Open(path)
+	if err != nil {
+		log.WithError(err).Error("error opening database")
+		return 1
+	}
+	defer db.Close()
+
+	w := os.Stdout
+	if output != "-" {
+		if w, err = os.OpenFile(output, os.O_WRONLY|os.O_CREATE|os.O_EXCL|os.O_TRUNC, 0755); err != nil {
+			log.WithError(err).
+				WithField("output", output).
+				Error("error opening output for writing")
+			return 1
+		}
+		defer w.Close()
+	}
+
+	if err = db.Fold(exportKey(db, w)); err != nil {
+		log.WithError(err).
+			WithField("path", path).
+			WithField("output", output).
+			Error("error exporting keys")
+		return 2
+	}
+	return 0
+}
+
+func exportKey(db *bitcask.Bitcask, w io.Writer) func(key []byte) error {
+	return func(key []byte) error {
+		value, err := db.Get(key)
+		if err != nil {
+			log.WithError(err).
+				WithField("key", key).
+				Error("error reading key")
+			return err
+		}
+
+		kv := kvPair{
+			Key:   base64.StdEncoding.EncodeToString([]byte(key)),
+			Value: base64.StdEncoding.EncodeToString(value),
+		}
+
+		data, err := json.Marshal(&kv)
+		if err != nil {
+			log.WithError(err).
+				WithField("key", key).
+				Error("error serialzing key")
+			return err
+		}
+
+		if n, err := w.Write(data); err != nil || n != len(data) {
+			if err == nil && n != len(data) {
+				err = errNotAllDataWritten
+			}
+			log.WithError(err).
+				WithField("key", key).
+				WithField("n", n).
+				Error("error writing key")
+			return err
+		}
+
+		if _, err := w.Write([]byte("\n")); err != nil {
+			log.WithError(err).Error("error writing newline")
+			return err
+		}
+
+		return nil
+	}
+}
--- a/cmd/bitcask/get.go
+++ b/cmd/bitcask/get.go
@ -8,7 +8,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

-	"github.com/prologic/bitcask"
+	"git.mills.io/prologic/bitcask"
 )

 var getCmd = &cobra.Command{
@ -38,7 +38,7 @@ func get(path, key string) int {
 	}
 	defer db.Close()

-	value, err := db.Get(key)
+	value, err := db.Get([]byte(key))
 	if err != nil {
 		log.WithError(err).Error("error reading key")
 		return 1
--- a/cmd/bitcask/import.go
+++ b/cmd/bitcask/import.go
@ -0,0 +1,106 @@
+package main
+
+import (
+	"bufio"
+	"encoding/base64"
+	"encoding/json"
+	"io"
+	"os"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+
+	"git.mills.io/prologic/bitcask"
+)
+
+var importCmd = &cobra.Command{
+	Use:     "import",
+	Aliases: []string{"restore", "read"},
+	Short:   "Import a database",
+	Long: `This command allows you to import or restore a database from a
+previous export/dump using the export command either creating a new database
+or adding additional key/value pairs to an existing one.`,
+	Args: cobra.RangeArgs(0, 1),
+	Run: func(cmd *cobra.Command, args []string) {
+		var input string
+
+		path := viper.GetString("path")
+
+		if len(args) == 1 {
+			input = args[0]
+		} else {
+			input = "-"
+		}
+
+		os.Exit(_import(path, input))
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(importCmd)
+}
+
+func _import(path, input string) int {
+	var (
+		err error
+		r   io.ReadCloser
+	)
+
+	db, err := bitcask.Open(path)
+	if err != nil {
+		log.WithError(err).Error("error opening database")
+		return 1
+	}
+	defer db.Close()
+
+	if input == "-" {
+		r = os.Stdin
+	} else {
+		r, err = os.Open(input)
+		if err != nil {
+			log.WithError(err).
+				WithField("input", input).
+				Error("error opening input for reading")
+			return 1
+		}
+	}
+
+	var kv kvPair
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		if err := json.Unmarshal(scanner.Bytes(), &kv); err != nil {
+			log.WithError(err).
+				WithField("input", input).
+				Error("error reading input")
+			return 2
+		}
+
+		key, err := base64.StdEncoding.DecodeString(kv.Key)
+		if err != nil {
+			log.WithError(err).Error("error decoding key")
+			return 2
+		}
+
+		value, err := base64.StdEncoding.DecodeString(kv.Value)
+		if err != nil {
+			log.WithError(err).Error("error decoding value")
+			return 2
+		}
+
+		if err := db.Put(key, value); err != nil {
+			log.WithError(err).Error("error writing key/value")
+			return 2
+		}
+	}
+	if err := scanner.Err(); err != nil {
+		log.WithError(err).
+			WithField("input", input).
+			Error("error reading input")
+		return 2
+
+	}
+
+	return 0
+}
--- a/cmd/bitcask/initdb.go
+++ b/cmd/bitcask/initdb.go
@ -0,0 +1,67 @@
+package main
+
+import (
+	"os"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+
+	"git.mills.io/prologic/bitcask"
+)
+
+var initdbCmd = &cobra.Command{
+	Use:     "initdb",
+	Aliases: []string{"create", "init"},
+	Short:   "Initialize a new database",
+	Long:    `This initializes a new database with persisted options`,
+	Args:    cobra.ExactArgs(0),
+	PreRun: func(cmd *cobra.Command, args []string) {
+		viper.BindPFlag("with-max-datafile-size", cmd.Flags().Lookup("with-max-datafile-size"))
+		viper.SetDefault("with-max-datafile-size", bitcask.DefaultMaxDatafileSize)
+
+		viper.BindPFlag("with-max-key-size", cmd.Flags().Lookup("with-max-key-size"))
+		viper.SetDefault("with-max-key-size", bitcask.DefaultMaxKeySize)
+
+		viper.BindPFlag("with-max-value-size", cmd.Flags().Lookup("with-max-value-size"))
+		viper.SetDefault("with-max-value-size", bitcask.DefaultMaxValueSize)
+	},
+	Run: func(cmd *cobra.Command, args []string) {
+		path := viper.GetString("path")
+
+		maxDatafileSize := viper.GetInt("with-max-datafile-size")
+		maxKeySize := viper.GetUint32("with-max-key-size")
+		maxValueSize := viper.GetUint64("with-max-value-size")
+
+		db, err := bitcask.Open(
+			path,
+			bitcask.WithMaxDatafileSize(maxDatafileSize),
+			bitcask.WithMaxKeySize(maxKeySize),
+			bitcask.WithMaxValueSize(maxValueSize),
+		)
+		if err != nil {
+			log.WithError(err).Error("error opening database")
+			os.Exit(1)
+		}
+		defer db.Close()
+
+		os.Exit(0)
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(initdbCmd)
+
+	initdbCmd.PersistentFlags().IntP(
+		"with-max-datafile-size", "", bitcask.DefaultMaxDatafileSize,
+		"Maximum size of each datafile",
+	)
+	initdbCmd.PersistentFlags().Uint32P(
+		"with-max-key-size", "", bitcask.DefaultMaxKeySize,
+		"Maximum size of each key",
+	)
+	initdbCmd.PersistentFlags().Uint64P(
+		"with-max-value-size", "", bitcask.DefaultMaxValueSize,
+		"Maximum size of each value",
+	)
+}
--- a/cmd/bitcask/keys.go
+++ b/cmd/bitcask/keys.go
@ -8,7 +8,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

-	"github.com/prologic/bitcask"
+	"git.mills.io/prologic/bitcask"
 )

 var keysCmd = &cobra.Command{
@ -36,8 +36,8 @@ func keys(path string) int {
 	}
 	defer db.Close()

-	err = db.Fold(func(key string) error {
-		fmt.Printf("%s\n", key)
+	err = db.Fold(func(key []byte) error {
+		fmt.Printf("%s\n", string(key))
 		return nil
 	})
 	if err != nil {
--- a/cmd/bitcask/merge.go
+++ b/cmd/bitcask/merge.go
@ -7,7 +7,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

-	"github.com/prologic/bitcask"
+	"git.mills.io/prologic/bitcask"
 )

 var mergeCmd = &cobra.Command{
@ -20,28 +20,23 @@ keys.`,
 	Args: cobra.ExactArgs(0),
 	Run: func(cmd *cobra.Command, args []string) {
 		path := viper.GetString("path")
-		force, err := cmd.Flags().GetBool("force")
-		if err != nil {
-			log.WithError(err).Error("error parsing force flag")
-			os.Exit(1)
-		}

-		os.Exit(merge(path, force))
+		os.Exit(merge(path))
 	},
 }

 func init() {
 	RootCmd.AddCommand(mergeCmd)
-
-	mergeCmd.Flags().BoolP(
-		"force", "f", false,
-		"Force a re-merge even if .hint files exist",
-	)
 }

-func merge(path string, force bool) int {
-	err := bitcask.Merge(path, force)
+func merge(path string) int {
+	db, err := bitcask.Open(path)
 	if err != nil {
+		log.WithError(err).Error("error opening database")
+		return 1
+	}
+
+	if err = db.Merge(); err != nil {
 		log.WithError(err).Error("error merging database")
 		return 1
 	}
--- a/cmd/bitcask/put.go
+++ b/cmd/bitcask/put.go
@ -10,14 +10,14 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

-	"github.com/prologic/bitcask"
+	"git.mills.io/prologic/bitcask"
 )

-var setCmd = &cobra.Command{
-	Use:     "set <key> [<value>]",
-	Aliases: []string{"add"},
-	Short:   "Add/Set a new Key/Value pair",
-	Long: `This adds or sets a new key/value pair.
+var putCmd = &cobra.Command{
+	Use:     "put <key> [<value>]",
+	Aliases: []string{"add", "set", "store"},
+	Short:   "Adds a new Key/Value pair",
+	Long: `This adds a new key/value pair or modifies an existing one.

 If the value is not specified as an argument it is read from standard input.`,
 	Args: cobra.MinimumNArgs(1),
@ -33,15 +33,15 @@ If the value is not specified as an argument it is read from standard input.`,
 			value = os.Stdin
 		}

-		os.Exit(set(path, key, value))
+		os.Exit(put(path, key, value))
 	},
 }

 func init() {
-	RootCmd.AddCommand(setCmd)
+	RootCmd.AddCommand(putCmd)
 }

-func set(path, key string, value io.Reader) int {
+func put(path, key string, value io.Reader) int {
 	db, err := bitcask.Open(path)
 	if err != nil {
 		log.WithError(err).Error("error opening database")
@ -55,7 +55,7 @@ func set(path, key string, value io.Reader) int {
 		return 1
 	}

-	err = db.Put(key, data)
+	err = db.Put([]byte(key), data)
 	if err != nil {
 		log.WithError(err).Error("error writing key")
 		return 1
--- a/cmd/bitcask/range.go
+++ b/cmd/bitcask/range.go
@ -0,0 +1,61 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+
+	"git.mills.io/prologic/bitcask"
+)
+
+var rangeCmd = &cobra.Command{
+	Use:     "range <start> <end>",
+	Aliases: []string{},
+	Short:   "Perform a range scan for keys from a start to end key",
+	Long: `This performa a range scan for keys  starting with the given start
+key and ending with the end key. This uses a Trie to search for matching keys
+within the range and returns all matched keys.`,
+	Args: cobra.ExactArgs(2),
+	Run: func(cmd *cobra.Command, args []string) {
+		path := viper.GetString("path")
+
+		start := args[0]
+		end := args[1]
+
+		os.Exit(_range(path, start, end))
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(rangeCmd)
+}
+
+func _range(path, start, end string) int {
+	db, err := bitcask.Open(path)
+	if err != nil {
+		log.WithError(err).Error("error opening database")
+		return 1
+	}
+	defer db.Close()
+
+	err = db.Range([]byte(start), []byte(end), func(key []byte) error {
+		value, err := db.Get(key)
+		if err != nil {
+			log.WithError(err).Error("error reading key")
+			return err
+		}
+
+		fmt.Printf("%s\n", string(value))
+		log.WithField("key", key).WithField("value", value).Debug("key/value")
+		return nil
+	})
+	if err != nil {
+		log.WithError(err).Error("error ranging over keys")
+		return 1
+	}
+
+	return 0
+}
--- a/cmd/bitcask/recover.go
+++ b/cmd/bitcask/recover.go
@ -0,0 +1,141 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+
+	"git.mills.io/prologic/bitcask"
+	"git.mills.io/prologic/bitcask/internal"
+	"git.mills.io/prologic/bitcask/internal/config"
+	"git.mills.io/prologic/bitcask/internal/data/codec"
+	"git.mills.io/prologic/bitcask/internal/index"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var recoveryCmd = &cobra.Command{
+	Use:     "recover",
+	Aliases: []string{"recovery"},
+	Short:   "Analyzes and recovers the index file for corruption scenarios",
+	Long: `This analyze files to detect different forms of persistence corruption in 
+persisted files. It also allows to recover the files to the latest point of integrity.
+Recovered files have the .recovered extension`,
+	Args: cobra.ExactArgs(0),
+	PreRun: func(cmd *cobra.Command, args []string) {
+		viper.BindPFlag("dry-run", cmd.Flags().Lookup("dry-run"))
+	},
+	Run: func(cmd *cobra.Command, args []string) {
+		path := viper.GetString("path")
+		dryRun := viper.GetBool("dry-run")
+		os.Exit(recover(path, dryRun))
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(recoveryCmd)
+	recoveryCmd.Flags().BoolP("dry-run", "n", false, "Will only check files health without applying recovery if unhealthy")
+}
+
+func recover(path string, dryRun bool) int {
+	maxKeySize := bitcask.DefaultMaxKeySize
+	maxValueSize := bitcask.DefaultMaxValueSize
+	if cfg, err := config.Load(filepath.Join(path, "config.json")); err == nil {
+		maxKeySize = cfg.MaxKeySize
+		maxValueSize = cfg.MaxValueSize
+	}
+
+	if err := recoverIndex(filepath.Join(path, "index"), maxKeySize, dryRun); err != nil {
+		log.WithError(err).Info("recovering index file")
+		return 1
+	}
+
+	datafiles, err := internal.GetDatafiles(path)
+	if err != nil {
+		log.WithError(err).Info("coudn't list existing datafiles")
+		return 1
+	}
+	for _, file := range datafiles {
+		if err := recoverDatafile(file, maxKeySize, maxValueSize, dryRun); err != nil {
+			log.WithError(err).Info("recovering data file")
+			return 1
+		}
+	}
+
+	return 0
+}
+
+func recoverIndex(path string, maxKeySize uint32, dryRun bool) error {
+	t, found, err := index.NewIndexer().Load(path, maxKeySize)
+	if err != nil && !index.IsIndexCorruption(err) {
+		log.WithError(err).Info("opening the index file")
+	}
+	if !found {
+		log.Info("index file doesn't exist, will be recreated on next run.")
+		return nil
+	}
+
+	if err == nil {
+		log.Debug("index file is not corrupted")
+		return nil
+	}
+	log.Debugf("index file is corrupted: %v", err)
+
+	if dryRun {
+		log.Debug("dry-run mode, not writing to a file")
+		return nil
+	}
+
+	// Leverage that t has the partiatially read tree even on corrupted files
+	err = index.NewIndexer().Save(t, "index.recovered")
+	if err != nil {
+		return fmt.Errorf("writing the recovered index file: %w", err)
+	}
+	log.Debug("the index was recovered in the index.recovered new file")
+
+	return nil
+}
+
+func recoverDatafile(path string, maxKeySize uint32, maxValueSize uint64, dryRun bool) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return fmt.Errorf("opening the datafile: %w", err)
+	}
+	defer f.Close()
+	_, file := filepath.Split(path)
+	fr, err := os.OpenFile(fmt.Sprintf("%s.recovered", file), os.O_CREATE|os.O_WRONLY, os.ModePerm)
+	if err != nil {
+		return fmt.Errorf("creating the recovered datafile: %w", err)
+	}
+	defer fr.Close()
+
+	dec := codec.NewDecoder(f, maxKeySize, maxValueSize)
+	enc := codec.NewEncoder(fr)
+	e := internal.Entry{}
+	for {
+		_, err = dec.Decode(&e)
+		if err == io.EOF {
+			break
+		}
+		if codec.IsCorruptedData(err) {
+			log.Debugf("%s is corrupted, a best-effort recovery was done", file)
+			return nil
+		}
+		if err != nil {
+			return fmt.Errorf("unexpected error while reading datafile: %w", err)
+		}
+		if dryRun {
+			continue
+		}
+		if _, err := enc.Encode(e); err != nil {
+			return fmt.Errorf("writing to recovered datafile: %w", err)
+		}
+	}
+	if err := os.Remove(fr.Name()); err != nil {
+		return fmt.Errorf("can't remove temporal recovered datafile: %w", err)
+	}
+	log.Debugf("%s is not corrupted", file)
+	return nil
+}
--- a/cmd/bitcask/root.go
+++ b/cmd/bitcask/root.go
@ -8,13 +8,13 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

-	"github.com/prologic/bitcask"
+	"git.mills.io/prologic/bitcask/internal"
 )

 // RootCmd represents the base command when called without any subcommands
 var RootCmd = &cobra.Command{
 	Use:     "bitcask",
-	Version: bitcask.FullVersion(),
+	Version: internal.FullVersion(),
 	Short:   "Command-line tools for bitcask",
 	Long: `This is the command-line tool to interact with a bitcask database.

--- a/cmd/bitcask/scan.go
+++ b/cmd/bitcask/scan.go
@ -8,13 +8,13 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

-	"github.com/prologic/bitcask"
+	"git.mills.io/prologic/bitcask"
 )

 var scanCmd = &cobra.Command{
 	Use:     "scan <prefix>",
 	Aliases: []string{"search", "find"},
-	Short:   "Perform a prefis scan for keys",
+	Short:   "Perform a prefix scan for keys",
 	Long: `This performa a prefix scan for keys  starting with the given
 prefix. This uses a Trie to search for matching keys and returns all matched
 keys.`,
@ -40,7 +40,7 @@ func scan(path, prefix string) int {
 	}
 	defer db.Close()

-	err = db.Scan(prefix, func(key string) error {
+	err = db.Scan([]byte(prefix), func(key []byte) error {
 		value, err := db.Get(key)
 		if err != nil {
 			log.WithError(err).Error("error reading key")
--- a/cmd/bitcask/stats.go
+++ b/cmd/bitcask/stats.go
@ -0,0 +1,55 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+
+	"git.mills.io/prologic/bitcask"
+)
+
+var statsCmd = &cobra.Command{
+	Use:     "stats",
+	Aliases: []string{},
+	Short:   "Display statis about the Database",
+	Long:    `This displays statistics about the Database"`,
+	Args:    cobra.ExactArgs(0),
+	Run: func(cmd *cobra.Command, args []string) {
+		path := viper.GetString("path")
+
+		os.Exit(stats(path))
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(statsCmd)
+}
+
+func stats(path string) int {
+	db, err := bitcask.Open(path)
+	if err != nil {
+		log.WithError(err).Error("error opening database")
+		return 1
+	}
+	defer db.Close()
+
+	stats, err := db.Stats()
+	if err != nil {
+		log.WithError(err).Error("error getting stats")
+		return 1
+	}
+
+	data, err := json.MarshalIndent(stats, "", "  ")
+	if err != nil {
+		log.WithError(err).Error("error marshalling stats")
+		return 1
+	}
+
+	fmt.Println(string(data))
+
+	return 0
+}
--- a/cmd/bitcaskd/main.go
+++ b/cmd/bitcaskd/main.go
@ -3,25 +3,22 @@ package main
 import (
 	"fmt"
 	"os"
-	"strings"

 	log "github.com/sirupsen/logrus"
 	flag "github.com/spf13/pflag"
-	"github.com/tidwall/redcon"

-	"github.com/prologic/bitcask"
+	"git.mills.io/prologic/bitcask/internal"
 )

 var (
-	bind            string
-	debug           bool
-	version         bool
-	maxDatafileSize int
+	bind    string
+	debug   bool
+	version bool
 )

 func init() {
 	flag.Usage = func() {
-		fmt.Fprintf(os.Stderr, "Usage: %s [options] <path>\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "Usage: %s [options] <dbpath>\n", os.Args[0])
 		flag.PrintDefaults()
 	}

@ -29,8 +26,6 @@ func init() {
 	flag.BoolVarP(&debug, "debug", "d", false, "enable debug logging")

 	flag.StringVarP(&bind, "bind", "b", ":6379", "interface and port to bind to")
-
-	flag.IntVar(&maxDatafileSize, "max-datafile-size", 1<<20, "maximum datafile size in bytes")
 }

 func main() {
@ -43,7 +38,7 @@ func main() {
 	}

 	if version {
-		fmt.Printf("bitcaskd version %s", bitcask.FullVersion())
+		fmt.Printf("bitcaskd version %s", internal.FullVersion())
 		os.Exit(0)
 	}

@ -54,70 +49,13 @@ func main() {

 	path := flag.Arg(0)

-	db, err := bitcask.Open(path, bitcask.WithMaxDatafileSize(maxDatafileSize))
+	server, err := newServer(bind, path)
 	if err != nil {
-		log.WithError(err).WithField("path", path).Error("error opening database")
-		os.Exit(1)
+		log.WithError(err).Error("error creating server")
+		os.Exit(2)
 	}

-	log.WithField("bind", bind).WithField("path", path).Infof("starting bitcaskd v%s", bitcask.FullVersion())
-
-	err = redcon.ListenAndServe(bind,
-		func(conn redcon.Conn, cmd redcon.Command) {
-			switch strings.ToLower(string(cmd.Args[0])) {
-			case "ping":
-				conn.WriteString("PONG")
-			case "quit":
-				conn.WriteString("OK")
-				conn.Close()
-			case "set":
-				if len(cmd.Args) != 3 {
-					conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
-					return
-				}
-				key := string(cmd.Args[1])
-				value := cmd.Args[2]
-				err = db.Put(key, value)
-				if err != nil {
-					conn.WriteString(fmt.Sprintf("ERR: %s", err))
-				} else {
-					conn.WriteString("OK")
-				}
-			case "get":
-				if len(cmd.Args) != 2 {
-					conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
-					return
-				}
-				key := string(cmd.Args[1])
-				value, err := db.Get(key)
-				if err != nil {
-					conn.WriteNull()
-				} else {
-					conn.WriteBulk(value)
-				}
-			case "del":
-				if len(cmd.Args) != 2 {
-					conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
-					return
-				}
-				key := string(cmd.Args[1])
-				err := db.Delete(key)
-				if err != nil {
-					conn.WriteInt(0)
-				} else {
-					conn.WriteInt(1)
-				}
-			default:
-				conn.WriteError("ERR unknown command '" + string(cmd.Args[0]) + "'")
-			}
-		},
-		func(conn redcon.Conn) bool {
-			return true
-		},
-		func(conn redcon.Conn, err error) {
-		},
-	)
-	if err != nil {
-		log.WithError(err).Fatal("oops")
+	if err = server.Run(); err != nil {
+		log.Fatal(err)
 	}
 }
--- a/cmd/bitcaskd/server.go
+++ b/cmd/bitcaskd/server.go
@ -0,0 +1,201 @@
+package main
+
+import (
+	"encoding/binary"
+	"fmt"
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/tidwall/redcon"
+
+	"git.mills.io/prologic/bitcask"
+)
+
+type server struct {
+	bind string
+	db   *bitcask.Bitcask
+}
+
+func newServer(bind, dbpath string) (*server, error) {
+	db, err := bitcask.Open(dbpath)
+	if err != nil {
+		log.WithError(err).WithField("dbpath", dbpath).Error("error opening database")
+		return nil, err
+	}
+
+	return &server{
+		bind: bind,
+		db:   db,
+	}, nil
+}
+
+func (s *server) handleSet(cmd redcon.Command, conn redcon.Conn) {
+	if len(cmd.Args) != 3 && len(cmd.Args) != 4 {
+		conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
+		return
+	}
+
+	var ttl *time.Duration
+
+	key := cmd.Args[1]
+	value := cmd.Args[2]
+
+	if len(cmd.Args) == 4 {
+		val, n := binary.Varint(cmd.Args[3])
+		if n <= 0 {
+			conn.WriteError("ERR error parsing ttl")
+			return
+		}
+		d := time.Duration(val) * time.Millisecond
+		ttl = &d
+	}
+
+	if ttl != nil {
+		if err := s.db.PutWithTTL(key, value, *ttl); err != nil {
+			conn.WriteString(fmt.Sprintf("ERR: %s", err))
+		}
+	} else {
+		if err := s.db.Put(key, value); err != nil {
+			conn.WriteString(fmt.Sprintf("ERR: %s", err))
+		}
+	}
+
+	conn.WriteString("OK")
+}
+
+func (s *server) handleGet(cmd redcon.Command, conn redcon.Conn) {
+	if len(cmd.Args) != 2 {
+		conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
+		return
+	}
+
+	key := cmd.Args[1]
+
+	value, err := s.db.Get(key)
+	if err != nil {
+		conn.WriteNull()
+	} else {
+		conn.WriteBulk(value)
+	}
+}
+
+func (s *server) handleKeys(cmd redcon.Command, conn redcon.Conn) {
+	if len(cmd.Args) != 2 {
+		conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
+		return
+	}
+
+	pattern := string(cmd.Args[1])
+
+	// Fast-track condition for improved speed
+	if pattern == "*" {
+		conn.WriteArray(s.db.Len())
+		for key := range s.db.Keys() {
+			conn.WriteBulk(key)
+		}
+		return
+	}
+
+	// Prefix handling
+	if strings.Count(pattern, "*") == 1 && strings.HasSuffix(pattern, "*") {
+		prefix := strings.ReplaceAll(pattern, "*", "")
+		count := 0
+		keys := make([][]byte, 0)
+		s.db.Scan([]byte(prefix), func(key []byte) error {
+			keys = append(keys, key)
+			count++
+			return nil
+		})
+		conn.WriteArray(count)
+		for _, key := range keys {
+			conn.WriteBulk(key)
+		}
+		return
+	}
+
+	// No results means empty array
+	conn.WriteArray(0)
+}
+
+func (s *server) handleExists(cmd redcon.Command, conn redcon.Conn) {
+	if len(cmd.Args) != 2 {
+		conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
+		return
+	}
+
+	key := cmd.Args[1]
+
+	if s.db.Has(key) {
+		conn.WriteInt(1)
+	} else {
+		conn.WriteInt(0)
+	}
+}
+
+func (s *server) handleDel(cmd redcon.Command, conn redcon.Conn) {
+	if len(cmd.Args) != 2 {
+		conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
+		return
+	}
+
+	key := cmd.Args[1]
+
+	if err := s.db.Delete(key); err != nil {
+		conn.WriteInt(0)
+	} else {
+		conn.WriteInt(1)
+	}
+}
+
+func (s *server) Shutdown() (err error) {
+	err = s.db.Close()
+	return
+}
+
+func (s *server) Run() (err error) {
+	redServer := redcon.NewServerNetwork("tcp", s.bind,
+		func(conn redcon.Conn, cmd redcon.Command) {
+			switch strings.ToLower(string(cmd.Args[0])) {
+			case "ping":
+				conn.WriteString("PONG")
+			case "quit":
+				conn.WriteString("OK")
+				conn.Close()
+			case "set":
+				s.handleSet(cmd, conn)
+			case "get":
+				s.handleGet(cmd, conn)
+			case "keys":
+				s.handleKeys(cmd, conn)
+			case "exists":
+				s.handleExists(cmd, conn)
+			case "del":
+				s.handleDel(cmd, conn)
+			default:
+				conn.WriteError("ERR unknown command '" + string(cmd.Args[0]) + "'")
+			}
+		},
+		func(conn redcon.Conn) bool {
+			return true
+		},
+		func(conn redcon.Conn, err error) {
+		},
+	)
+
+	go func() {
+		signals := make(chan os.Signal, 1)
+		signal.Notify(signals, os.Interrupt, syscall.SIGTERM)
+		s := <-signals
+		log.Infof("Shutdown server on signal %s", s)
+		redServer.Close()
+	}()
+
+	if err := redServer.ListenAndServe(); err == nil {
+		return s.Shutdown()
+	}
+	return
+}
--- a/cmd/bitcaskd/server_test.go
+++ b/cmd/bitcaskd/server_test.go
@ -0,0 +1,102 @@
+package main
+
+import (
+	"net"
+	"strconv"
+	"testing"
+
+	"github.com/tidwall/redcon"
+)
+
+func TestHandleKeys(t *testing.T) {
+	s, err := newServer(":61234", "./test.db")
+	if err != nil {
+		t.Fatalf("Unable to create server: %v", err)
+	}
+	s.db.Put([]byte("foo"), []byte("bar"))
+	testCases := []TestCase{
+		{
+			Command: redcon.Command{
+				Raw:  []byte("KEYS *"),
+				Args: [][]byte{[]byte("KEYS"), []byte("*")},
+			},
+			Expected: "1,foo",
+		},
+		{
+			Command: redcon.Command{
+				Raw:  []byte("KEYS fo*"),
+				Args: [][]byte{[]byte("KEYS"), []byte("fo*")},
+			},
+			Expected: "1,foo",
+		},
+		{
+			Command: redcon.Command{
+				Raw:  []byte("KEYS ba*"),
+				Args: [][]byte{[]byte("KEYS"), []byte("ba*")},
+			},
+			Expected: "0",
+		},
+		{
+			Command: redcon.Command{
+				Raw:  []byte("KEYS *oo"),
+				Args: [][]byte{[]byte("KEYS"), []byte("*oo")},
+			},
+			Expected: "0",
+		},
+	}
+	for _, testCase := range testCases {
+		conn := DummyConn{}
+		s.handleKeys(testCase.Command, &conn)
+		if testCase.Expected != conn.Result {
+			t.Fatalf("s.handleKeys failed: expected '%s', got '%s'", testCase.Expected, conn.Result)
+		}
+	}
+}
+
+type TestCase struct {
+	Command  redcon.Command
+	Expected string
+}
+
+type DummyConn struct {
+	Result string
+}
+
+func (dc *DummyConn) RemoteAddr() string {
+	return ""
+}
+func (dc *DummyConn) Close() error {
+	return nil
+}
+func (dc *DummyConn) WriteError(msg string)  {}
+func (dc *DummyConn) WriteString(str string) {}
+func (dc *DummyConn) WriteBulk(bulk []byte) {
+	dc.Result += "," + string(bulk)
+}
+func (dc *DummyConn) WriteBulkString(bulk string) {}
+func (dc *DummyConn) WriteInt(num int)            {}
+func (dc *DummyConn) WriteInt64(num int64)        {}
+func (dc *DummyConn) WriteUint64(num uint64)      {}
+func (dc *DummyConn) WriteArray(count int) {
+	dc.Result = strconv.Itoa(count)
+}
+func (dc *DummyConn) WriteNull()               {}
+func (dc *DummyConn) WriteRaw(data []byte)     {}
+func (dc *DummyConn) WriteAny(any interface{}) {}
+func (dc *DummyConn) Context() interface{} {
+	return nil
+}
+func (dc *DummyConn) SetContext(v interface{}) {}
+func (dc *DummyConn) SetReadBuffer(bytes int)  {}
+func (dc *DummyConn) Detach() redcon.DetachedConn {
+	return nil
+}
+func (dc *DummyConn) ReadPipeline() []redcon.Command {
+	return nil
+}
+func (dc *DummyConn) PeekPipeline() []redcon.Command {
+	return nil
+}
+func (dc *DummyConn) NetConn() net.Conn {
+	return nil
+}
--- a/datafile.go
+++ b/datafile.go
@ -1,141 +0,0 @@
-package bitcask
-
-import (
-	"fmt"
-	"os"
-	"path/filepath"
-	"sync"
-	"time"
-
-	"github.com/pkg/errors"
-
-	pb "github.com/prologic/bitcask/proto"
-	"github.com/prologic/bitcask/streampb"
-)
-
-const (
-	DefaultDatafileFilename = "%09d.data"
-)
-
-var (
-	ErrReadonly = errors.New("error: read only datafile")
-)
-
-type Datafile struct {
-	sync.RWMutex
-
-	id     int
-	r      *os.File
-	w      *os.File
-	offset int64
-	dec    *streampb.Decoder
-	enc    *streampb.Encoder
-}
-
-func NewDatafile(path string, id int, readonly bool) (*Datafile, error) {
-	var (
-		r   *os.File
-		w   *os.File
-		err error
-	)
-
-	fn := filepath.Join(path, fmt.Sprintf(DefaultDatafileFilename, id))
-
-	if !readonly {
-		w, err = os.OpenFile(fn, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0640)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	r, err = os.Open(fn)
-	if err != nil {
-		return nil, err
-	}
-	stat, err := r.Stat()
-	if err != nil {
-		return nil, errors.Wrap(err, "error calling Stat()")
-	}
-
-	offset := stat.Size()
-
-	dec := streampb.NewDecoder(r)
-	enc := streampb.NewEncoder(w)
-
-	return &Datafile{
-		id:     id,
-		r:      r,
-		w:      w,
-		offset: offset,
-		dec:    dec,
-		enc:    enc,
-	}, nil
-}
-
-func (df *Datafile) Name() string {
-	return df.r.Name()
-}
-
-func (df *Datafile) Close() error {
-	if df.w == nil {
-		return df.r.Close()
-	}
-
-	err := df.Sync()
-	if err != nil {
-		return err
-	}
-	return df.w.Close()
-}
-
-func (df *Datafile) Sync() error {
-	if df.w == nil {
-		return nil
-	}
-	return df.w.Sync()
-}
-
-func (df *Datafile) Size() (int64, error) {
-	df.RLock()
-	defer df.RUnlock()
-	return df.offset, nil
-}
-
-func (df *Datafile) Read() (e pb.Entry, err error) {
-	df.Lock()
-	defer df.Unlock()
-
-	return e, df.dec.Decode(&e)
-}
-
-func (df *Datafile) ReadAt(index int64) (e pb.Entry, err error) {
-	df.Lock()
-	defer df.Unlock()
-
-	_, err = df.r.Seek(index, os.SEEK_SET)
-	if err != nil {
-		return
-	}
-
-	return e, df.dec.Decode(&e)
-}
-
-func (df *Datafile) Write(e pb.Entry) (int64, error) {
-	if df.w == nil {
-		return -1, ErrReadonly
-	}
-
-	df.Lock()
-	defer df.Unlock()
-
-	e.Index = df.offset
-	e.Timestamp = time.Now().Unix()
-
-	n, err := df.enc.Encode(&e)
-	if err != nil {
-		return -1, err
-	}
-	df.offset += n
-
-	return e.Index, nil
-}
--- a/doc.go
+++ b/doc.go
@ -0,0 +1,3 @@
+// Package bitcask implements a high-performance key-value store based on a
+// WAL and LSM.
+package bitcask
--- a/doc_test.go
+++ b/doc_test.go
@ -0,0 +1,13 @@
+package bitcask
+
+func Example() {
+	_, _ = Open("path/to/db")
+}
+
+func Example_withOptions() {
+	opts := []Option{
+		WithMaxKeySize(1024),
+		WithMaxValueSize(4096),
+	}
+	_, _ = Open("path/to/db", opts...)
+}
--- a/entry.go
+++ b/entry.go
@ -1,17 +0,0 @@
-package bitcask
-
-import (
-	"hash/crc32"
-
-	pb "github.com/prologic/bitcask/proto"
-)
-
-func NewEntry(key string, value []byte) pb.Entry {
-	crc := crc32.ChecksumIEEE(value)
-
-	return pb.Entry{
-		CRC:   crc,
-		Key:   key,
-		Value: value,
-	}
-}
--- a/errors.go
+++ b/errors.go
@ -0,0 +1,77 @@
+package bitcask
+
+import (
+	"errors"
+	"fmt"
+)
+
+var (
+	// ErrKeyNotFound is the error returned when a key is not found
+	ErrKeyNotFound = errors.New("error: key not found")
+
+	// ErrKeyTooLarge is the error returned for a key that exceeds the
+	// maximum allowed key size (configured with WithMaxKeySize).
+	ErrKeyTooLarge = errors.New("error: key too large")
+
+	// ErrKeyExpired is the error returned when a key is queried which has
+	// already expired (due to ttl)
+	ErrKeyExpired = errors.New("error: key expired")
+
+	// ErrEmptyKey is the error returned for a value with an empty key.
+	ErrEmptyKey = errors.New("error: empty key")
+
+	// ErrValueTooLarge is the error returned for a value that exceeds the
+	// maximum allowed value size (configured with WithMaxValueSize).
+	ErrValueTooLarge = errors.New("error: value too large")
+
+	// ErrChecksumFailed is the error returned if a key/value retrieved does
+	// not match its CRC checksum
+	ErrChecksumFailed = errors.New("error: checksum failed")
+
+	// ErrDatabaseLocked is the error returned if the database is locked
+	// (typically opened by another process)
+	ErrDatabaseLocked = errors.New("error: database locked")
+
+	// ErrInvalidRange is the error returned when the range scan is invalid
+	ErrInvalidRange = errors.New("error: invalid range")
+
+	// ErrInvalidVersion is the error returned when the database version is invalid
+	ErrInvalidVersion = errors.New("error: invalid db version")
+
+	// ErrMergeInProgress is the error returned if merge is called when already a merge
+	// is in progress
+	ErrMergeInProgress = errors.New("error: merge already in progress")
+)
+
+// ErrBadConfig is the error returned on failure to load the database config
+type ErrBadConfig struct {
+	Err error
+}
+
+func (e *ErrBadConfig) Is(target error) bool {
+	if _, ok := target.(*ErrBadConfig); ok {
+		return true
+	}
+	return errors.Is(e.Err, target)
+}
+func (e *ErrBadConfig) Unwrap() error { return e.Err }
+func (e *ErrBadConfig) Error() string {
+	return fmt.Sprintf("error reading config.json: %s", e.Err)
+}
+
+// ErrBadMetadata is the error returned on failure to load the database metadata
+type ErrBadMetadata struct {
+	Err error
+}
+
+func (e *ErrBadMetadata) Is(target error) bool {
+	if _, ok := target.(*ErrBadMetadata); ok {
+		return true
+	}
+	return errors.Is(e.Err, target)
+}
+
+func (e *ErrBadMetadata) Unwrap() error { return e.Err }
+func (e *ErrBadMetadata) Error() string {
+	return fmt.Sprintf("error reading meta.json: %s", e.Err)
+}
--- a/go.mod
+++ b/go.mod
@ -1,22 +1,18 @@
-module github.com/prologic/bitcask
+module git.mills.io/prologic/bitcask
+
+go 1.16

 require (
-	github.com/derekparker/trie v0.0.0-20180212171413-e608c2733dc7
-	github.com/gofrs/flock v0.7.1
-	github.com/gogo/protobuf v1.2.1
-	github.com/golang/protobuf v1.2.0
-	github.com/gorilla/websocket v1.4.0 // indirect
-	github.com/jpillora/backoff v0.0.0-20180909062703-3050d21c67d7 // indirect
-	github.com/mitchellh/go-homedir v1.1.0
-	github.com/pkg/errors v0.8.1
-	github.com/prologic/msgbus v0.1.1
-	github.com/prologic/trie v0.0.0-20190316011403-395e39dac705
-	github.com/prometheus/client_golang v0.9.2 // indirect
-	github.com/sirupsen/logrus v1.3.0
-	github.com/spf13/cobra v0.0.3
-	github.com/spf13/pflag v1.0.3
-	github.com/spf13/viper v1.3.1
-	github.com/stretchr/testify v1.3.0
-	github.com/tidwall/redcon v0.9.0
-	gopkg.in/vmihailenco/msgpack.v2 v2.9.1
+	github.com/abcum/lcp v0.0.0-20201209214815-7a3f3840be81
+	github.com/gofrs/flock v0.8.0
+	github.com/pkg/errors v0.9.1
+	github.com/plar/go-adaptive-radix-tree v1.0.4
+	github.com/sirupsen/logrus v1.8.1
+	github.com/spf13/cobra v0.0.7
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.8.1
+	github.com/stretchr/objx v0.2.0 // indirect
+	github.com/stretchr/testify v1.7.0
+	github.com/tidwall/redcon v1.4.1
+	golang.org/x/exp v0.0.0-20200228211341-fcea875c7e85
 )
--- a/go.sum
+++ b/go.sum
@ -1,93 +1,692 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
+cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
+cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
+cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
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--- a/internal/config/config.go
+++ b/internal/config/config.go
@ -0,0 +1,51 @@
+package config
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"os"
+)
+
+// Config contains the bitcask configuration parameters
+type Config struct {
+	MaxDatafileSize         int    `json:"max_datafile_size"`
+	MaxKeySize              uint32 `json:"max_key_size"`
+	MaxValueSize            uint64 `json:"max_value_size"`
+	Sync                    bool   `json:"sync"`
+	AutoRecovery            bool   `json:"autorecovery"`
+	DBVersion               uint32 `json:"db_version"`
+	DirFileModeBeforeUmask  os.FileMode
+	FileFileModeBeforeUmask os.FileMode
+}
+
+// Load loads a configuration from the given path
+func Load(path string) (*Config, error) {
+	var cfg Config
+
+	data, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return nil, err
+	}
+
+	return &cfg, nil
+}
+
+// Save saves the configuration to the provided path
+func (c *Config) Save(path string) error {
+
+	data, err := json.Marshal(c)
+	if err != nil {
+		return err
+	}
+
+	err = ioutil.WriteFile(path, data, c.FileFileModeBeforeUmask)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
--- a/internal/data/codec/decoder.go
+++ b/internal/data/codec/decoder.go
@ -0,0 +1,110 @@
+package codec
+
+import (
+	"encoding/binary"
+	"io"
+	"time"
+
+	"github.com/pkg/errors"
+	"git.mills.io/prologic/bitcask/internal"
+)
+
+var (
+	errInvalidKeyOrValueSize = errors.New("key/value size is invalid")
+	errCantDecodeOnNilEntry  = errors.New("can't decode on nil entry")
+	errTruncatedData         = errors.New("data is truncated")
+)
+
+// NewDecoder creates a streaming Entry decoder.
+func NewDecoder(r io.Reader, maxKeySize uint32, maxValueSize uint64) *Decoder {
+	return &Decoder{
+		r:            r,
+		maxKeySize:   maxKeySize,
+		maxValueSize: maxValueSize,
+	}
+}
+
+// Decoder wraps an underlying io.Reader and allows you to stream
+// Entry decodings on it.
+type Decoder struct {
+	r            io.Reader
+	maxKeySize   uint32
+	maxValueSize uint64
+}
+
+// Decode decodes the next Entry from the current stream
+func (d *Decoder) Decode(v *internal.Entry) (int64, error) {
+	if v == nil {
+		return 0, errCantDecodeOnNilEntry
+	}
+
+	prefixBuf := make([]byte, keySize+valueSize)
+
+	_, err := io.ReadFull(d.r, prefixBuf)
+	if err != nil {
+		return 0, err
+	}
+
+	actualKeySize, actualValueSize, err := getKeyValueSizes(prefixBuf, d.maxKeySize, d.maxValueSize)
+	if err != nil {
+		return 0, err
+	}
+
+	buf := make([]byte, uint64(actualKeySize)+actualValueSize+checksumSize+ttlSize)
+	if _, err = io.ReadFull(d.r, buf); err != nil {
+		return 0, errTruncatedData
+	}
+
+	decodeWithoutPrefix(buf, actualKeySize, v)
+	return int64(keySize + valueSize + uint64(actualKeySize) + actualValueSize + checksumSize + ttlSize), nil
+}
+
+// DecodeEntry decodes a serialized entry
+func DecodeEntry(b []byte, e *internal.Entry, maxKeySize uint32, maxValueSize uint64) error {
+	valueOffset, _, err := getKeyValueSizes(b, maxKeySize, maxValueSize)
+	if err != nil {
+		return errors.Wrap(err, "key/value sizes are invalid")
+	}
+
+	decodeWithoutPrefix(b[keySize+valueSize:], valueOffset, e)
+
+	return nil
+}
+
+func getKeyValueSizes(buf []byte, maxKeySize uint32, maxValueSize uint64) (uint32, uint64, error) {
+	actualKeySize := binary.BigEndian.Uint32(buf[:keySize])
+	actualValueSize := binary.BigEndian.Uint64(buf[keySize:])
+
+	if (maxKeySize > 0 && actualKeySize > maxKeySize) || (maxValueSize > 0 && actualValueSize > maxValueSize) || actualKeySize == 0 {
+
+		return 0, 0, errInvalidKeyOrValueSize
+	}
+
+	return actualKeySize, actualValueSize, nil
+}
+
+func decodeWithoutPrefix(buf []byte, valueOffset uint32, v *internal.Entry) {
+	v.Key = buf[:valueOffset]
+	v.Value = buf[valueOffset : len(buf)-checksumSize-ttlSize]
+	v.Checksum = binary.BigEndian.Uint32(buf[len(buf)-checksumSize-ttlSize : len(buf)-ttlSize])
+	v.Expiry = getKeyExpiry(buf)
+}
+
+func getKeyExpiry(buf []byte) *time.Time {
+	expiry := binary.BigEndian.Uint64(buf[len(buf)-ttlSize:])
+	if expiry == uint64(0) {
+		return nil
+	}
+	t := time.Unix(int64(expiry), 0).UTC()
+	return &t
+}
+
+// IsCorruptedData indicates if the error correspondes to possible data corruption
+func IsCorruptedData(err error) bool {
+	switch err {
+	case errCantDecodeOnNilEntry, errInvalidKeyOrValueSize, errTruncatedData:
+		return true
+	default:
+		return false
+	}
+}
--- a/internal/data/codec/decoder_test.go
+++ b/internal/data/codec/decoder_test.go
@ -0,0 +1,130 @@
+package codec
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+	"testing"
+	"time"
+
+	"git.mills.io/prologic/bitcask/internal"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDecodeOnNilEntry(t *testing.T) {
+	t.Parallel()
+	assert := assert.New(t)
+	decoder := NewDecoder(&bytes.Buffer{}, 1, 1)
+
+	_, err := decoder.Decode(nil)
+	if assert.Error(err) {
+		assert.Equal(errCantDecodeOnNilEntry, err)
+	}
+}
+
+func TestShortPrefix(t *testing.T) {
+	t.Parallel()
+	assert := assert.New(t)
+	maxKeySize, maxValueSize := uint32(10), uint64(20)
+	prefix := make([]byte, keySize+valueSize)
+	binary.BigEndian.PutUint32(prefix, 1)
+	binary.BigEndian.PutUint64(prefix[keySize:], 1)
+
+	truncBytesCount := 2
+	buf := bytes.NewBuffer(prefix[:keySize+valueSize-truncBytesCount])
+	decoder := NewDecoder(buf, maxKeySize, maxValueSize)
+	_, err := decoder.Decode(&internal.Entry{})
+	if assert.Error(err) {
+		assert.Equal(io.ErrUnexpectedEOF, err)
+	}
+}
+
+func TestInvalidValueKeySizes(t *testing.T) {
+	assert := assert.New(t)
+	maxKeySize, maxValueSize := uint32(10), uint64(20)
+
+	tests := []struct {
+		keySize   uint32
+		valueSize uint64
+		name      string
+	}{
+		{keySize: 0, valueSize: 5, name: "zero key size"}, //zero value size is correct for tombstones
+		{keySize: 11, valueSize: 5, name: "key size overflow"},
+		{keySize: 5, valueSize: 21, name: "value size overflow"},
+		{keySize: 11, valueSize: 21, name: "key and value size overflow"},
+	}
+
+	for i := range tests {
+		i := i
+		t.Run(tests[i].name, func(t *testing.T) {
+			t.Parallel()
+			prefix := make([]byte, keySize+valueSize)
+			binary.BigEndian.PutUint32(prefix, tests[i].keySize)
+			binary.BigEndian.PutUint64(prefix[keySize:], tests[i].valueSize)
+
+			buf := bytes.NewBuffer(prefix)
+			decoder := NewDecoder(buf, maxKeySize, maxValueSize)
+			_, err := decoder.Decode(&internal.Entry{})
+			if assert.Error(err) {
+				assert.Equal(errInvalidKeyOrValueSize, err)
+			}
+		})
+	}
+}
+
+func TestTruncatedData(t *testing.T) {
+	assert := assert.New(t)
+	maxKeySize, maxValueSize := uint32(10), uint64(20)
+
+	key := []byte("foo")
+	value := []byte("bar")
+	data := make([]byte, keySize+valueSize+len(key)+len(value)+checksumSize)
+
+	binary.BigEndian.PutUint32(data, uint32(len(key)))
+	binary.BigEndian.PutUint64(data[keySize:], uint64(len(value)))
+	copy(data[keySize+valueSize:], key)
+	copy(data[keySize+valueSize+len(key):], value)
+	copy(data[keySize+valueSize+len(key)+len(value):], bytes.Repeat([]byte("0"), checksumSize))
+
+	tests := []struct {
+		data []byte
+		name string
+	}{
+		{data: data[:keySize+valueSize+len(key)-1], name: "truncated key"},
+		{data: data[:keySize+valueSize+len(key)+len(value)-1], name: "truncated value"},
+		{data: data[:keySize+valueSize+len(key)+len(value)+checksumSize-1], name: "truncated checksum"},
+	}
+
+	for i := range tests {
+		i := i
+		t.Run(tests[i].name, func(t *testing.T) {
+			t.Parallel()
+			buf := bytes.NewBuffer(tests[i].data)
+			decoder := NewDecoder(buf, maxKeySize, maxValueSize)
+			_, err := decoder.Decode(&internal.Entry{})
+			if assert.Error(err) {
+				assert.Equal(errTruncatedData, err)
+			}
+		})
+	}
+}
+
+func TestDecodeWithoutPrefix(t *testing.T) {
+	assert := assert.New(t)
+	e := internal.Entry{}
+	buf := []byte{0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 7, 109, 121, 107, 101, 121, 109, 121, 118, 97, 108, 117, 101, 0, 6, 81, 189, 0, 0, 0, 0, 95, 117, 28, 0}
+	valueOffset := uint32(5)
+	mockTime := time.Date(2020, 10, 1, 0, 0, 0, 0, time.UTC)
+	expectedEntry := internal.Entry{
+		Key:      []byte("mykey"),
+		Value:    []byte("myvalue"),
+		Checksum: 414141,
+		Expiry:   &mockTime,
+	}
+	decodeWithoutPrefix(buf[keySize+valueSize:], valueOffset, &e)
+	assert.Equal(expectedEntry.Key, e.Key)
+	assert.Equal(expectedEntry.Value, e.Value)
+	assert.Equal(expectedEntry.Checksum, e.Checksum)
+	assert.Equal(expectedEntry.Offset, e.Offset)
+	assert.Equal(*expectedEntry.Expiry, *e.Expiry)
+}
--- a/internal/data/codec/encoder.go
+++ b/internal/data/codec/encoder.go
@ -0,0 +1,69 @@
+package codec
+
+import (
+	"bufio"
+	"encoding/binary"
+	"io"
+
+	"github.com/pkg/errors"
+	"git.mills.io/prologic/bitcask/internal"
+)
+
+const (
+	keySize      = 4
+	valueSize    = 8
+	checksumSize = 4
+	ttlSize      = 8
+	MetaInfoSize = keySize + valueSize + checksumSize + ttlSize
+)
+
+// NewEncoder creates a streaming Entry encoder.
+func NewEncoder(w io.Writer) *Encoder {
+	return &Encoder{w: bufio.NewWriter(w)}
+}
+
+// Encoder wraps an underlying io.Writer and allows you to stream
+// Entry encodings on it.
+type Encoder struct {
+	w *bufio.Writer
+}
+
+// Encode takes any Entry and streams it to the underlying writer.
+// Messages are framed with a key-length and value-length prefix.
+func (e *Encoder) Encode(msg internal.Entry) (int64, error) {
+	var bufKeyValue = make([]byte, keySize+valueSize)
+	binary.BigEndian.PutUint32(bufKeyValue[:keySize], uint32(len(msg.Key)))
+	binary.BigEndian.PutUint64(bufKeyValue[keySize:keySize+valueSize], uint64(len(msg.Value)))
+	if _, err := e.w.Write(bufKeyValue); err != nil {
+		return 0, errors.Wrap(err, "failed writing key & value length prefix")
+	}
+
+	if _, err := e.w.Write(msg.Key); err != nil {
+		return 0, errors.Wrap(err, "failed writing key data")
+	}
+	if _, err := e.w.Write(msg.Value); err != nil {
+		return 0, errors.Wrap(err, "failed writing value data")
+	}
+
+	bufChecksumSize := bufKeyValue[:checksumSize]
+	binary.BigEndian.PutUint32(bufChecksumSize, msg.Checksum)
+	if _, err := e.w.Write(bufChecksumSize); err != nil {
+		return 0, errors.Wrap(err, "failed writing checksum data")
+	}
+
+	bufTTL := bufKeyValue[:ttlSize]
+	if msg.Expiry == nil {
+		binary.BigEndian.PutUint64(bufTTL, uint64(0))
+	} else {
+		binary.BigEndian.PutUint64(bufTTL, uint64(msg.Expiry.Unix()))
+	}
+	if _, err := e.w.Write(bufTTL); err != nil {
+		return 0, errors.Wrap(err, "failed writing ttl data")
+	}
+
+	if err := e.w.Flush(); err != nil {
+		return 0, errors.Wrap(err, "failed flushing data")
+	}
+
+	return int64(keySize + valueSize + len(msg.Key) + len(msg.Value) + checksumSize + ttlSize), nil
+}
--- a/internal/data/codec/encoder_test.go
+++ b/internal/data/codec/encoder_test.go
@ -0,0 +1,32 @@
+package codec
+
+import (
+	"bytes"
+	"encoding/hex"
+	"testing"
+	"time"
+
+	"git.mills.io/prologic/bitcask/internal"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestEncode(t *testing.T) {
+	t.Parallel()
+	assert := assert.New(t)
+
+	var buf bytes.Buffer
+	mockTime := time.Date(2020, 10, 1, 0, 0, 0, 0, time.UTC)
+	encoder := NewEncoder(&buf)
+	_, err := encoder.Encode(internal.Entry{
+		Key:      []byte("mykey"),
+		Value:    []byte("myvalue"),
+		Checksum: 414141,
+		Offset:   424242,
+		Expiry:   &mockTime,
+	})
+
+	expectedHex := "0000000500000000000000076d796b65796d7976616c7565000651bd000000005f751c00"
+	if assert.NoError(err) {
+		assert.Equal(expectedHex, hex.EncodeToString(buf.Bytes()))
+	}
+}
--- a/internal/data/datafile.go
+++ b/internal/data/datafile.go
@ -0,0 +1,200 @@
+package data
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"sync"
+
+	"git.mills.io/prologic/bitcask/internal"
+	"git.mills.io/prologic/bitcask/internal/data/codec"
+	"github.com/pkg/errors"
+	"golang.org/x/exp/mmap"
+)
+
+const (
+	defaultDatafileFilename = "%09d.data"
+)
+
+var (
+	errReadonly  = errors.New("error: read only datafile")
+	errReadError = errors.New("error: read error")
+)
+
+// Datafile is an interface  that represents a readable and writeable datafile
+type Datafile interface {
+	FileID() int
+	Name() string
+	Close() error
+	Sync() error
+	Size() int64
+	Read() (internal.Entry, int64, error)
+	ReadAt(index, size int64) (internal.Entry, error)
+	Write(internal.Entry) (int64, int64, error)
+}
+
+type datafile struct {
+	sync.RWMutex
+
+	id           int
+	r            *os.File
+	ra           *mmap.ReaderAt
+	w            *os.File
+	offset       int64
+	dec          *codec.Decoder
+	enc          *codec.Encoder
+	maxKeySize   uint32
+	maxValueSize uint64
+}
+
+// NewDatafile opens an existing datafile
+func NewDatafile(path string, id int, readonly bool, maxKeySize uint32, maxValueSize uint64, fileMode os.FileMode) (Datafile, error) {
+	var (
+		r   *os.File
+		ra  *mmap.ReaderAt
+		w   *os.File
+		err error
+	)
+
+	fn := filepath.Join(path, fmt.Sprintf(defaultDatafileFilename, id))
+
+	if !readonly {
+		w, err = os.OpenFile(fn, os.O_WRONLY|os.O_APPEND|os.O_CREATE, fileMode)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	r, err = os.Open(fn)
+	if err != nil {
+		return nil, err
+	}
+	stat, err := r.Stat()
+	if err != nil {
+		return nil, errors.Wrap(err, "error calling Stat()")
+	}
+
+	if readonly {
+		ra, err = mmap.Open(fn)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	offset := stat.Size()
+
+	dec := codec.NewDecoder(r, maxKeySize, maxValueSize)
+	enc := codec.NewEncoder(w)
+
+	return &datafile{
+		id:           id,
+		r:            r,
+		ra:           ra,
+		w:            w,
+		offset:       offset,
+		dec:          dec,
+		enc:          enc,
+		maxKeySize:   maxKeySize,
+		maxValueSize: maxValueSize,
+	}, nil
+}
+
+func (df *datafile) FileID() int {
+	return df.id
+}
+
+func (df *datafile) Name() string {
+	return df.r.Name()
+}
+
+func (df *datafile) Close() error {
+	defer func() {
+		if df.ra != nil {
+			df.ra.Close()
+		}
+		df.r.Close()
+	}()
+
+	// Readonly datafile -- Nothing further to close on the write side
+	if df.w == nil {
+		return nil
+	}
+
+	err := df.Sync()
+	if err != nil {
+		return err
+	}
+	return df.w.Close()
+}
+
+func (df *datafile) Sync() error {
+	if df.w == nil {
+		return nil
+	}
+	return df.w.Sync()
+}
+
+func (df *datafile) Size() int64 {
+	df.RLock()
+	defer df.RUnlock()
+	return df.offset
+}
+
+// Read reads the next entry from the datafile
+func (df *datafile) Read() (e internal.Entry, n int64, err error) {
+	df.Lock()
+	defer df.Unlock()
+
+	n, err = df.dec.Decode(&e)
+	if err != nil {
+		return
+	}
+
+	return
+}
+
+// ReadAt the entry located at index offset with expected serialized size
+func (df *datafile) ReadAt(index, size int64) (e internal.Entry, err error) {
+	var n int
+
+	b := make([]byte, size)
+
+	df.RLock()
+	defer df.RUnlock()
+
+	if df.ra != nil {
+		n, err = df.ra.ReadAt(b, index)
+	} else {
+		n, err = df.r.ReadAt(b, index)
+	}
+	if err != nil {
+		return
+	}
+	if int64(n) != size {
+		err = errReadError
+		return
+	}
+
+	codec.DecodeEntry(b, &e, df.maxKeySize, df.maxValueSize)
+
+	return
+}
+
+func (df *datafile) Write(e internal.Entry) (int64, int64, error) {
+	if df.w == nil {
+		return -1, 0, errReadonly
+	}
+
+	df.Lock()
+	defer df.Unlock()
+
+	e.Offset = df.offset
+
+	n, err := df.enc.Encode(e)
+	if err != nil {
+		return -1, 0, err
+	}
+	df.offset += n
+
+	return e.Offset, n, nil
+}
--- a/internal/data/recover.go
+++ b/internal/data/recover.go
@ -0,0 +1,95 @@
+package data
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+
+	"git.mills.io/prologic/bitcask/internal"
+	"git.mills.io/prologic/bitcask/internal/config"
+	"git.mills.io/prologic/bitcask/internal/data/codec"
+)
+
+// CheckAndRecover checks and recovers the last datafile.
+// If the datafile isn't corrupted, this is a noop. If it is,
+// the longest non-corrupted prefix will be kept and the rest
+// will be *deleted*. Also, the index file is also *deleted* which
+// will be automatically recreated on next startup.
+func CheckAndRecover(path string, cfg *config.Config) error {
+	dfs, err := internal.GetDatafiles(path)
+	if err != nil {
+		return fmt.Errorf("scanning datafiles: %s", err)
+	}
+	if len(dfs) == 0 {
+		return nil
+	}
+	f := dfs[len(dfs)-1]
+	recovered, err := recoverDatafile(f, cfg)
+	if err != nil {
+		return fmt.Errorf("error recovering data file: %s", err)
+	}
+	if recovered {
+		if err := os.Remove(filepath.Join(path, "index")); err != nil {
+			return fmt.Errorf("error deleting the index on recovery: %s", err)
+		}
+	}
+	return nil
+}
+
+func recoverDatafile(path string, cfg *config.Config) (recovered bool, err error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return false, fmt.Errorf("opening the datafile: %s", err)
+	}
+	defer func() {
+		closeErr := f.Close()
+		if err == nil {
+			err = closeErr
+		}
+	}()
+	dir, file := filepath.Split(path)
+	rPath := filepath.Join(dir, fmt.Sprintf("%s.recovered", file))
+	fr, err := os.OpenFile(rPath, os.O_CREATE|os.O_WRONLY, os.ModePerm)
+	if err != nil {
+		return false, fmt.Errorf("creating the recovered datafile: %w", err)
+	}
+	defer func() {
+		closeErr := fr.Close()
+		if err == nil {
+			err = closeErr
+		}
+	}()
+
+	dec := codec.NewDecoder(f, cfg.MaxKeySize, cfg.MaxValueSize)
+	enc := codec.NewEncoder(fr)
+	e := internal.Entry{}
+
+	corrupted := false
+	for !corrupted {
+		_, err = dec.Decode(&e)
+		if err == io.EOF {
+			break
+		}
+		if codec.IsCorruptedData(err) {
+			corrupted = true
+			continue
+		}
+		if err != nil {
+			return false, fmt.Errorf("unexpected error while reading datafile: %w", err)
+		}
+		if _, err := enc.Encode(e); err != nil {
+			return false, fmt.Errorf("writing to recovered datafile: %w", err)
+		}
+	}
+	if !corrupted {
+		if err := os.Remove(fr.Name()); err != nil {
+			return false, fmt.Errorf("can't remove temporal recovered datafile: %w", err)
+		}
+		return false, nil
+	}
+	if err := os.Rename(rPath, path); err != nil {
+		return false, fmt.Errorf("removing corrupted file: %s", err)
+	}
+	return true, nil
+}
--- a/internal/entry.go
+++ b/internal/entry.go
@ -0,0 +1,27 @@
+package internal
+
+import (
+	"hash/crc32"
+	"time"
+)
+
+// Entry represents a key/value in the database
+type Entry struct {
+	Checksum uint32
+	Key      []byte
+	Offset   int64
+	Value    []byte
+	Expiry   *time.Time
+}
+
+// NewEntry creates a new `Entry` with the given `key` and `value`
+func NewEntry(key, value []byte, expiry *time.Time) Entry {
+	checksum := crc32.ChecksumIEEE(value)
+
+	return Entry{
+		Checksum: checksum,
+		Key:      key,
+		Value:    value,
+		Expiry:   expiry,
+	}
+}
--- a/internal/index/codec_index.go
+++ b/internal/index/codec_index.go
@ -0,0 +1,134 @@
+package index
+
+import (
+	"encoding/binary"
+	"io"
+
+	"github.com/pkg/errors"
+	art "github.com/plar/go-adaptive-radix-tree"
+	"git.mills.io/prologic/bitcask/internal"
+)
+
+var (
+	errTruncatedKeySize = errors.New("key size is truncated")
+	errTruncatedKeyData = errors.New("key data is truncated")
+	errTruncatedData    = errors.New("data is truncated")
+	errKeySizeTooLarge  = errors.New("key size too large")
+)
+
+const (
+	int32Size  = 4
+	int64Size  = 8
+	fileIDSize = int32Size
+	offsetSize = int64Size
+	sizeSize   = int64Size
+)
+
+func readKeyBytes(r io.Reader, maxKeySize uint32) ([]byte, error) {
+	s := make([]byte, int32Size)
+	_, err := io.ReadFull(r, s)
+	if err != nil {
+		if err == io.EOF {
+			return nil, err
+		}
+		return nil, errors.Wrap(errTruncatedKeySize, err.Error())
+	}
+	size := binary.BigEndian.Uint32(s)
+	if maxKeySize > 0 && size > uint32(maxKeySize) {
+		return nil, errKeySizeTooLarge
+	}
+
+	b := make([]byte, size)
+	_, err = io.ReadFull(r, b)
+	if err != nil {
+		return nil, errors.Wrap(errTruncatedKeyData, err.Error())
+	}
+	return b, nil
+}
+
+func writeBytes(b []byte, w io.Writer) error {
+	s := make([]byte, int32Size)
+	binary.BigEndian.PutUint32(s, uint32(len(b)))
+	_, err := w.Write(s)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(b)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func readItem(r io.Reader) (internal.Item, error) {
+	buf := make([]byte, (fileIDSize + offsetSize + sizeSize))
+	_, err := io.ReadFull(r, buf)
+	if err != nil {
+		return internal.Item{}, errors.Wrap(errTruncatedData, err.Error())
+	}
+
+	return internal.Item{
+		FileID: int(binary.BigEndian.Uint32(buf[:fileIDSize])),
+		Offset: int64(binary.BigEndian.Uint64(buf[fileIDSize:(fileIDSize + offsetSize)])),
+		Size:   int64(binary.BigEndian.Uint64(buf[(fileIDSize + offsetSize):])),
+	}, nil
+}
+
+func writeItem(item internal.Item, w io.Writer) error {
+	buf := make([]byte, (fileIDSize + offsetSize + sizeSize))
+	binary.BigEndian.PutUint32(buf[:fileIDSize], uint32(item.FileID))
+	binary.BigEndian.PutUint64(buf[fileIDSize:(fileIDSize+offsetSize)], uint64(item.Offset))
+	binary.BigEndian.PutUint64(buf[(fileIDSize+offsetSize):], uint64(item.Size))
+	_, err := w.Write(buf)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// ReadIndex reads a persisted from a io.Reader into a Tree
+func readIndex(r io.Reader, t art.Tree, maxKeySize uint32) error {
+	for {
+		key, err := readKeyBytes(r, maxKeySize)
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+
+		item, err := readItem(r)
+		if err != nil {
+			return err
+		}
+
+		t.Insert(key, item)
+	}
+
+	return nil
+}
+
+func writeIndex(t art.Tree, w io.Writer) (err error) {
+	t.ForEach(func(node art.Node) bool {
+		err = writeBytes(node.Key(), w)
+		if err != nil {
+			return false
+		}
+
+		item := node.Value().(internal.Item)
+		err := writeItem(item, w)
+		return err == nil
+	})
+	return
+}
+
+// IsIndexCorruption returns a boolean indicating whether the error
+// is known to report a corruption data issue
+func IsIndexCorruption(err error) bool {
+	cause := errors.Cause(err)
+	switch cause {
+	case errKeySizeTooLarge, errTruncatedData, errTruncatedKeyData, errTruncatedKeySize:
+		return true
+	}
+	return false
+}
--- a/internal/index/codec_index_test.go
+++ b/internal/index/codec_index_test.go
@ -0,0 +1,126 @@
+package index
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/binary"
+	"testing"
+
+	"github.com/pkg/errors"
+	art "github.com/plar/go-adaptive-radix-tree"
+	"git.mills.io/prologic/bitcask/internal"
+)
+
+const (
+	base64SampleTree = "AAAABGFiY2QAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAARhYmNlAAAAAQAAAAAAAAABAAAAAAAAAAEAAAAEYWJjZgAAAAIAAAAAAAAAAgAAAAAAAAACAAAABGFiZ2QAAAADAAAAAAAAAAMAAAAAAAAAAw=="
+)
+
+func TestWriteIndex(t *testing.T) {
+	at, expectedSerializedSize := getSampleTree()
+
+	var b bytes.Buffer
+	err := writeIndex(at, &b)
+	if err != nil {
+		t.Fatalf("writing index failed: %v", err)
+	}
+	if b.Len() != expectedSerializedSize {
+		t.Fatalf("incorrect size of serialied index: expected %d, got: %d", expectedSerializedSize, b.Len())
+	}
+	sampleTreeBytes, _ := base64.StdEncoding.DecodeString(base64SampleTree)
+	if !bytes.Equal(b.Bytes(), sampleTreeBytes) {
+		t.Fatalf("unexpected serialization of the tree")
+	}
+}
+
+func TestReadIndex(t *testing.T) {
+	sampleTreeBytes, _ := base64.StdEncoding.DecodeString(base64SampleTree)
+	b := bytes.NewBuffer(sampleTreeBytes)
+
+	at := art.New()
+	err := readIndex(b, at, 1024)
+	if err != nil {
+		t.Fatalf("error while deserializing correct sample tree: %v", err)
+	}
+
+	atsample, _ := getSampleTree()
+	if atsample.Size() != at.Size() {
+		t.Fatalf("trees aren't the same size, expected %v, got %v", atsample.Size(), at.Size())
+	}
+	atsample.ForEach(func(node art.Node) bool {
+		_, found := at.Search(node.Key())
+		if !found {
+			t.Fatalf("expected node wasn't found: %s", node.Key())
+		}
+		return true
+	})
+}
+
+func TestReadCorruptedData(t *testing.T) {
+	sampleBytes, _ := base64.StdEncoding.DecodeString(base64SampleTree)
+
+	t.Run("truncated", func(t *testing.T) {
+		table := []struct {
+			name string
+			err  error
+			data []byte
+		}{
+			{name: "key-size-first-item", err: errTruncatedKeySize, data: sampleBytes[:2]},
+			{name: "key-data-second-item", err: errTruncatedKeyData, data: sampleBytes[:6]},
+			{name: "key-size-second-item", err: errTruncatedKeySize, data: sampleBytes[:(int32Size+4+fileIDSize+offsetSize+sizeSize)+2]},
+			{name: "key-data-second-item", err: errTruncatedKeyData, data: sampleBytes[:(int32Size+4+fileIDSize+offsetSize+sizeSize)+6]},
+			{name: "data", err: errTruncatedData, data: sampleBytes[:int32Size+4+(fileIDSize+offsetSize+sizeSize-3)]},
+		}
+
+		for i := range table {
+			t.Run(table[i].name, func(t *testing.T) {
+				bf := bytes.NewBuffer(table[i].data)
+
+				if err := readIndex(bf, art.New(), 1024); !IsIndexCorruption(err) || errors.Cause(err) != table[i].err {
+					t.Fatalf("expected %v, got %v", table[i].err, err)
+				}
+			})
+		}
+	})
+
+	t.Run("overflow", func(t *testing.T) {
+		overflowKeySize := make([]byte, len(sampleBytes))
+		copy(overflowKeySize, sampleBytes)
+		binary.BigEndian.PutUint32(overflowKeySize, 1025)
+
+		overflowDataSize := make([]byte, len(sampleBytes))
+		copy(overflowDataSize, sampleBytes)
+		binary.BigEndian.PutUint32(overflowDataSize[int32Size+4+fileIDSize+offsetSize:], 1025)
+
+		table := []struct {
+			name       string
+			err        error
+			maxKeySize uint32
+			data       []byte
+		}{
+			{name: "key-data-overflow", err: errKeySizeTooLarge, maxKeySize: 1024, data: overflowKeySize},
+		}
+
+		for i := range table {
+			t.Run(table[i].name, func(t *testing.T) {
+				bf := bytes.NewBuffer(table[i].data)
+
+				if err := readIndex(bf, art.New(), table[i].maxKeySize); !IsIndexCorruption(err) || errors.Cause(err) != table[i].err {
+					t.Fatalf("expected %v, got %v", table[i].err, err)
+				}
+			})
+		}
+	})
+
+}
+
+func getSampleTree() (art.Tree, int) {
+	at := art.New()
+	keys := [][]byte{[]byte("abcd"), []byte("abce"), []byte("abcf"), []byte("abgd")}
+	expectedSerializedSize := 0
+	for i := range keys {
+		at.Insert(keys[i], internal.Item{FileID: i, Offset: int64(i), Size: int64(i)})
+		expectedSerializedSize += int32Size + len(keys[i]) + fileIDSize + offsetSize + sizeSize
+	}
+
+	return at, expectedSerializedSize
+}
--- a/internal/index/index.go
+++ b/internal/index/index.go
@ -0,0 +1,59 @@
+package index
+
+import (
+	"os"
+
+	art "github.com/plar/go-adaptive-radix-tree"
+	"git.mills.io/prologic/bitcask/internal"
+)
+
+// Indexer is an interface for loading and saving the index (an Adaptive Radix Tree)
+type Indexer interface {
+	Load(path string, maxkeySize uint32) (art.Tree, bool, error)
+	Save(t art.Tree, path string) error
+}
+
+// NewIndexer returns an instance of the default `Indexer` implemtnation
+// which perists the index (an Adaptive Radix Tree) as a binary blob on file
+func NewIndexer() Indexer {
+	return &indexer{}
+}
+
+type indexer struct{}
+
+func (i *indexer) Load(path string, maxKeySize uint32) (art.Tree, bool, error) {
+	t := art.New()
+
+	if !internal.Exists(path) {
+		return t, false, nil
+	}
+
+	f, err := os.Open(path)
+	if err != nil {
+		return t, true, err
+	}
+	defer f.Close()
+
+	if err := readIndex(f, t, maxKeySize); err != nil {
+		return t, true, err
+	}
+	return t, true, nil
+}
+
+func (i *indexer) Save(t art.Tree, path string) error {
+	f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	if err := writeIndex(t, f); err != nil {
+		return err
+	}
+
+	if err := f.Sync(); err != nil {
+		return err
+	}
+
+	return f.Close()
+}
--- a/internal/index/ttl_index.go
+++ b/internal/index/ttl_index.go
@ -0,0 +1,71 @@
+package index
+
+import (
+	"encoding/binary"
+	"io"
+	"os"
+	"time"
+
+	art "github.com/plar/go-adaptive-radix-tree"
+	"git.mills.io/prologic/bitcask/internal"
+)
+
+type ttlIndexer struct{}
+
+func NewTTLIndexer() Indexer {
+	return ttlIndexer{}
+}
+
+func (i ttlIndexer) Save(t art.Tree, path string) error {
+	f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		return err
+	}
+	buf := make([]byte, int64Size)
+	for it := t.Iterator(); it.HasNext(); {
+		node, err := it.Next()
+		if err != nil {
+			return err
+		}
+		// save key
+		err = writeBytes(node.Key(), f)
+		if err != nil {
+			return err
+		}
+		// save key ttl
+		binary.BigEndian.PutUint64(buf, uint64(node.Value().(time.Time).Unix()))
+		_, err = f.Write(buf)
+		if err != nil {
+			return err
+		}
+	}
+	return f.Sync()
+}
+
+func (i ttlIndexer) Load(path string, maxKeySize uint32) (art.Tree, bool, error) {
+	t := art.New()
+	if !internal.Exists(path) {
+		return t, false, nil
+	}
+	f, err := os.Open(path)
+	if err != nil {
+		return t, true, err
+	}
+	buf := make([]byte, int64Size)
+	for {
+		key, err := readKeyBytes(f, maxKeySize)
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return t, true, err
+		}
+		_, err = io.ReadFull(f, buf)
+		if err != nil {
+			return t, true, err
+		}
+		expiry := time.Unix(int64(binary.BigEndian.Uint64(buf)), 0).UTC()
+		t.Insert(key, expiry)
+	}
+	return t, true, nil
+}
--- a/internal/index/ttl_index_test.go
+++ b/internal/index/ttl_index_test.go
@ -0,0 +1,54 @@
+package index
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	art "github.com/plar/go-adaptive-radix-tree"
+	assert2 "github.com/stretchr/testify/assert"
+)
+
+func Test_TTLIndexer(t *testing.T) {
+	assert := assert2.New(t)
+	tempDir, err := ioutil.TempDir("", "bitcask")
+	assert.NoError(err)
+	defer os.RemoveAll(tempDir)
+
+	currTime := time.Date(2020, 12, 27, 0, 0, 0, 0, time.UTC)
+	trie := art.New()
+
+	t.Run("LoadEmpty", func(t *testing.T) {
+		newTrie, found, err := NewTTLIndexer().Load(filepath.Join(tempDir, "ttl_index"), 4)
+		assert.NoError(err)
+		assert.False(found)
+		assert.Equal(trie, newTrie)
+	})
+
+	t.Run("Save", func(t *testing.T) {
+		trie.Insert([]byte("key"), currTime)
+		err := NewTTLIndexer().Save(trie, filepath.Join(tempDir, "ttl_index"))
+		assert.NoError(err)
+		trie.Insert([]byte("foo"), currTime.Add(24*time.Hour))
+		err = NewTTLIndexer().Save(trie, filepath.Join(tempDir, "ttl_index"))
+		assert.NoError(err)
+		trie.Insert([]byte("key"), currTime.Add(-24*time.Hour))
+		err = NewTTLIndexer().Save(trie, filepath.Join(tempDir, "ttl_index"))
+		assert.NoError(err)
+	})
+
+	t.Run("Load", func(t *testing.T) {
+		newTrie, found, err := NewTTLIndexer().Load(filepath.Join(tempDir, "ttl_index"), 4)
+		assert.NoError(err)
+		assert.True(found)
+		assert.Equal(2, newTrie.Size())
+		value, found := newTrie.Search([]byte("key"))
+		assert.True(found)
+		assert.Equal(currTime.Add(-24*time.Hour), value)
+		value, found = newTrie.Search([]byte("foo"))
+		assert.True(found)
+		assert.Equal(currTime.Add(24*time.Hour), value)
+	})
+}
--- a/internal/item.go
+++ b/internal/item.go
@ -0,0 +1,10 @@
+package internal
+
+// Item represents the location of the value on disk. This is used by the
+// internal Adaptive Radix Tree to hold an in-memory structure mapping keys to
+// locations on disk of where the value(s) can be read from.
+type Item struct {
+	FileID int   `json:"fileid"`
+	Offset int64 `json:"offset"`
+	Size   int64 `json:"size"`
+}
--- a/internal/metadata/metadata.go
+++ b/internal/metadata/metadata.go
@ -0,0 +1,22 @@
+package metadata
+
+import (
+	"os"
+
+	"git.mills.io/prologic/bitcask/internal"
+)
+
+type MetaData struct {
+	IndexUpToDate    bool  `json:"index_up_to_date"`
+	ReclaimableSpace int64 `json:"reclaimable_space"`
+}
+
+func (m *MetaData) Save(path string, mode os.FileMode) error {
+	return internal.SaveJsonToFile(m, path, mode)
+}
+
+func Load(path string) (*MetaData, error) {
+	var m MetaData
+	err := internal.LoadFromJsonFile(path, &m)
+	return &m, err
+}
--- a/internal/mocks/datafile.go
+++ b/internal/mocks/datafile.go
@ -0,0 +1,158 @@
+// Code generated by mockery v1.0.0. DO NOT EDIT.
+
+package mocks
+
+import internal "git.mills.io/prologic/bitcask/internal"
+import mock "github.com/stretchr/testify/mock"
+
+// Datafile is an autogenerated mock type for the Datafile type
+type Datafile struct {
+	mock.Mock
+}
+
+// Close provides a mock function with given fields:
+func (_m *Datafile) Close() error {
+	ret := _m.Called()
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func() error); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// FileID provides a mock function with given fields:
+func (_m *Datafile) FileID() int {
+	ret := _m.Called()
+
+	var r0 int
+	if rf, ok := ret.Get(0).(func() int); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(int)
+	}
+
+	return r0
+}
+
+// Name provides a mock function with given fields:
+func (_m *Datafile) Name() string {
+	ret := _m.Called()
+
+	var r0 string
+	if rf, ok := ret.Get(0).(func() string); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(string)
+	}
+
+	return r0
+}
+
+// Read provides a mock function with given fields:
+func (_m *Datafile) Read() (internal.Entry, int64, error) {
+	ret := _m.Called()
+
+	var r0 internal.Entry
+	if rf, ok := ret.Get(0).(func() internal.Entry); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(internal.Entry)
+	}
+
+	var r1 int64
+	if rf, ok := ret.Get(1).(func() int64); ok {
+		r1 = rf()
+	} else {
+		r1 = ret.Get(1).(int64)
+	}
+
+	var r2 error
+	if rf, ok := ret.Get(2).(func() error); ok {
+		r2 = rf()
+	} else {
+		r2 = ret.Error(2)
+	}
+
+	return r0, r1, r2
+}
+
+// ReadAt provides a mock function with given fields: index, size
+func (_m *Datafile) ReadAt(index int64, size int64) (internal.Entry, error) {
+	ret := _m.Called(index, size)
+
+	var r0 internal.Entry
+	if rf, ok := ret.Get(0).(func(int64, int64) internal.Entry); ok {
+		r0 = rf(index, size)
+	} else {
+		r0 = ret.Get(0).(internal.Entry)
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(int64, int64) error); ok {
+		r1 = rf(index, size)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Size provides a mock function with given fields:
+func (_m *Datafile) Size() int64 {
+	ret := _m.Called()
+
+	var r0 int64
+	if rf, ok := ret.Get(0).(func() int64); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(int64)
+	}
+
+	return r0
+}
+
+// Sync provides a mock function with given fields:
+func (_m *Datafile) Sync() error {
+	ret := _m.Called()
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func() error); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// Write provides a mock function with given fields: _a0
+func (_m *Datafile) Write(_a0 internal.Entry) (int64, int64, error) {
+	ret := _m.Called(_a0)
+
+	var r0 int64
+	if rf, ok := ret.Get(0).(func(internal.Entry) int64); ok {
+		r0 = rf(_a0)
+	} else {
+		r0 = ret.Get(0).(int64)
+	}
+
+	var r1 int64
+	if rf, ok := ret.Get(1).(func(internal.Entry) int64); ok {
+		r1 = rf(_a0)
+	} else {
+		r1 = ret.Get(1).(int64)
+	}
+
+	var r2 error
+	if rf, ok := ret.Get(2).(func(internal.Entry) error); ok {
+		r2 = rf(_a0)
+	} else {
+		r2 = ret.Error(2)
+	}
+
+	return r0, r1, r2
+}
--- a/internal/mocks/indexer.go
+++ b/internal/mocks/indexer.go
@ -0,0 +1,56 @@
+// Code generated by mockery v1.0.0. DO NOT EDIT.
+
+package mocks
+
+import art "github.com/plar/go-adaptive-radix-tree"
+
+import mock "github.com/stretchr/testify/mock"
+
+// Indexer is an autogenerated mock type for the Indexer type
+type Indexer struct {
+	mock.Mock
+}
+
+// Load provides a mock function with given fields: path, maxkeySize
+func (_m *Indexer) Load(path string, maxkeySize uint32) (art.Tree, bool, error) {
+	ret := _m.Called(path, maxkeySize)
+
+	var r0 art.Tree
+	if rf, ok := ret.Get(0).(func(string, uint32) art.Tree); ok {
+		r0 = rf(path, maxkeySize)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(art.Tree)
+		}
+	}
+
+	var r1 bool
+	if rf, ok := ret.Get(1).(func(string, uint32) bool); ok {
+		r1 = rf(path, maxkeySize)
+	} else {
+		r1 = ret.Get(1).(bool)
+	}
+
+	var r2 error
+	if rf, ok := ret.Get(2).(func(string, uint32) error); ok {
+		r2 = rf(path, maxkeySize)
+	} else {
+		r2 = ret.Error(2)
+	}
+
+	return r0, r1, r2
+}
+
+// Save provides a mock function with given fields: t, path
+func (_m *Indexer) Save(t art.Tree, path string) error {
+	ret := _m.Called(t, path)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(art.Tree, string) error); ok {
+		r0 = rf(t, path)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
--- a/internal/utils.go
+++ b/internal/utils.go
@ -0,0 +1,112 @@
+package internal
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+// Exists returns `true` if the given `path` on the current file system exists
+func Exists(path string) bool {
+	_, err := os.Stat(path)
+	return err == nil
+}
+
+// DirSize returns the space occupied by the given `path` on disk on the current
+// file system.
+func DirSize(path string) (int64, error) {
+	var size int64
+	err := filepath.Walk(path, func(_ string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if !info.IsDir() {
+			size += info.Size()
+		}
+		return err
+	})
+	return size, err
+}
+
+// GetDatafiles returns a list of all data files stored in the database path
+// given by `path`. All datafiles are identified by the the glob `*.data` and
+// the basename is represented by a monotonic increasing integer.
+// The returned files are *sorted* in increasing order.
+func GetDatafiles(path string) ([]string, error) {
+	fns, err := filepath.Glob(fmt.Sprintf("%s/*.data", path))
+	if err != nil {
+		return nil, err
+	}
+	sort.Strings(fns)
+	return fns, nil
+}
+
+// ParseIds will parse a list of datafiles as returned by `GetDatafiles` and
+// extract the id part and return a slice of ints.
+func ParseIds(fns []string) ([]int, error) {
+	var ids []int
+	for _, fn := range fns {
+		fn = filepath.Base(fn)
+		ext := filepath.Ext(fn)
+		if ext != ".data" {
+			continue
+		}
+		id, err := strconv.ParseInt(strings.TrimSuffix(fn, ext), 10, 32)
+		if err != nil {
+			return nil, err
+		}
+		ids = append(ids, int(id))
+	}
+	sort.Ints(ids)
+	return ids, nil
+}
+
+// Copy copies source contents to destination
+func Copy(src, dst string, exclude []string) error {
+	return filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
+		relPath := strings.Replace(path, src, "", 1)
+		if relPath == "" {
+			return nil
+		}
+		for _, e := range exclude {
+			matched, err := filepath.Match(e, info.Name())
+			if err != nil {
+				return err
+			}
+			if matched {
+				return nil
+			}
+		}
+		if info.IsDir() {
+			return os.Mkdir(filepath.Join(dst, relPath), info.Mode())
+		}
+		var data, err1 = ioutil.ReadFile(filepath.Join(src, relPath))
+		if err1 != nil {
+			return err1
+		}
+		return ioutil.WriteFile(filepath.Join(dst, relPath), data, info.Mode())
+	})
+}
+
+// SaveJsonToFile converts v into json and store in file identified by path
+func SaveJsonToFile(v interface{}, path string, mode os.FileMode) error {
+	b, err := json.Marshal(v)
+	if err != nil {
+		return err
+	}
+	return ioutil.WriteFile(path, b, mode)
+}
+
+// LoadFromJsonFile reads file located at `path` and put its content in json format in v
+func LoadFromJsonFile(path string, v interface{}) error {
+	b, err := ioutil.ReadFile(path)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(b, v)
+}
--- a/internal/utils_test.go
+++ b/internal/utils_test.go
@ -0,0 +1,108 @@
+package internal
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Copy(t *testing.T) {
+	assert := assert.New(t)
+	t.Run("CopyDir", func(t *testing.T) {
+		tempsrc, err := ioutil.TempDir("", "test")
+		assert.NoError(err)
+		defer os.RemoveAll(tempsrc)
+		var f *os.File
+
+		tempdir, err := ioutil.TempDir(tempsrc, "")
+		assert.NoError(err)
+
+		f, err = os.OpenFile(filepath.Join(tempsrc, "file1"), os.O_WRONLY|os.O_CREATE, 0755)
+		assert.NoError(err)
+		n, err := f.WriteString("test123")
+		assert.Equal(7, n)
+		assert.NoError(err)
+		f.Close()
+
+		f, err = os.OpenFile(filepath.Join(tempsrc, "file2"), os.O_WRONLY|os.O_CREATE, 0755)
+		assert.NoError(err)
+		n, err = f.WriteString("test1234")
+		assert.Equal(8, n)
+		assert.NoError(err)
+		f.Close()
+
+		f, err = os.OpenFile(filepath.Join(tempsrc, "file3"), os.O_WRONLY|os.O_CREATE, 0755)
+		assert.NoError(err)
+		f.Close()
+
+		tempdst, err := ioutil.TempDir("", "backup")
+		assert.NoError(err)
+		defer os.RemoveAll(tempdst)
+		err = Copy(tempsrc, tempdst, []string{"file3"})
+		assert.NoError(err)
+		buf := make([]byte, 10)
+
+		exists := Exists(filepath.Join(tempdst, filepath.Base(tempdir)))
+		assert.Equal(true, exists)
+
+		f, err = os.Open(filepath.Join(tempdst, "file1"))
+		assert.NoError(err)
+		n, err = f.Read(buf[:7])
+		assert.NoError(err)
+		assert.Equal(7, n)
+		assert.Equal([]byte("test123"), buf[:7])
+		_, err = f.Read(buf)
+		assert.Equal(io.EOF, err)
+		f.Close()
+
+		f, err = os.Open(filepath.Join(tempdst, "file2"))
+		assert.NoError(err)
+		n, err = f.Read(buf[:8])
+		assert.NoError(err)
+		assert.Equal(8, n)
+		assert.Equal([]byte("test1234"), buf[:8])
+		_, err = f.Read(buf)
+		assert.Equal(io.EOF, err)
+		f.Close()
+
+		exists = Exists(filepath.Join(tempdst, "file3"))
+		assert.Equal(false, exists)
+	})
+}
+
+func Test_SaveAndLoad(t *testing.T) {
+	assert := assert.New(t)
+	t.Run("save and load", func(t *testing.T) {
+		tempdir, err := ioutil.TempDir("", "bitcask")
+		assert.NoError(err)
+		defer os.RemoveAll(tempdir)
+		type test struct {
+			Value bool `json:"value"`
+		}
+		m := test{Value: true}
+		err = SaveJsonToFile(&m, filepath.Join(tempdir, "meta.json"), 0755)
+		assert.NoError(err)
+		m1 := test{}
+		err = LoadFromJsonFile(filepath.Join(tempdir, "meta.json"), &m1)
+		assert.NoError(err)
+		assert.Equal(m, m1)
+	})
+
+	t.Run("save and load error", func(t *testing.T) {
+		tempdir, err := ioutil.TempDir("", "bitcask")
+		assert.NoError(err)
+		defer os.RemoveAll(tempdir)
+		type test struct {
+			Value bool `json:"value"`
+		}
+		err = SaveJsonToFile(make(chan int), filepath.Join(tempdir, "meta.json"), 0755)
+		assert.Error(err)
+		m1 := test{}
+		err = LoadFromJsonFile(filepath.Join(tempdir, "meta.json"), &m1)
+		assert.Error(err)
+	})
+}
--- a/internal/version.go
+++ b/internal/version.go
@ -1,4 +1,4 @@
-package bitcask
+package internal

 import (
 	"fmt"
--- a/internal/version_test.go
+++ b/internal/version_test.go
@ -1,4 +1,4 @@
-package bitcask
+package internal

 import (
 	"fmt"
--- a/keydir.go
+++ b/keydir.go
@ -1,95 +0,0 @@
-package bitcask
-
-import (
-	"bytes"
-	"encoding/gob"
-	"io"
-	"io/ioutil"
-	"sync"
-)
-
-type Item struct {
-	FileID    int
-	Index     int64
-	Timestamp int64
-}
-
-type Keydir struct {
-	sync.RWMutex
-	kv map[string]Item
-}
-
-func NewKeydir() *Keydir {
-	return &Keydir{
-		kv: make(map[string]Item),
-	}
-}
-
-func (k *Keydir) Add(key string, fileid int, index, timestamp int64) Item {
-	item := Item{
-		FileID:    fileid,
-		Index:     index,
-		Timestamp: timestamp,
-	}
-
-	k.Lock()
-	k.kv[key] = item
-	k.Unlock()
-
-	return item
-}
-
-func (k *Keydir) Get(key string) (Item, bool) {
-	k.RLock()
-	defer k.RUnlock()
-
-	item, ok := k.kv[key]
-	return item, ok
-}
-
-func (k *Keydir) Delete(key string) {
-	k.Lock()
-	defer k.Unlock()
-
-	delete(k.kv, key)
-}
-
-func (k *Keydir) Keys() chan string {
-	ch := make(chan string)
-	go func() {
-		for k := range k.kv {
-			ch <- k
-		}
-		close(ch)
-	}()
-	return ch
-}
-
-func (k *Keydir) Bytes() ([]byte, error) {
-	var buf bytes.Buffer
-	enc := gob.NewEncoder(&buf)
-	err := enc.Encode(k.kv)
-	if err != nil {
-		return nil, err
-	}
-	return buf.Bytes(), nil
-}
-
-func (k *Keydir) Save(fn string) error {
-	data, err := k.Bytes()
-	if err != nil {
-		return err
-	}
-
-	return ioutil.WriteFile(fn, data, 0644)
-}
-
-func NewKeydirFromBytes(r io.Reader) (*Keydir, error) {
-	k := NewKeydir()
-	dec := gob.NewDecoder(r)
-	err := dec.Decode(&k.kv)
-	if err != nil {
-		return nil, err
-	}
-	return k, nil
-}
--- a/options.go
+++ b/options.go
@ -1,42 +1,118 @@
 package bitcask

-const (
-	DefaultMaxDatafileSize = 1 << 20 // 1MB
-	DefaultMaxKeySize      = 64      // 64 bytes
-	DefaultMaxValueSize    = 1 << 16 // 65KB
+import (
+	"os"
+
+	"git.mills.io/prologic/bitcask/internal/config"
 )

-type Options struct {
-	MaxDatafileSize int
-	MaxKeySize      int
-	MaxValueSize    int
-}
+const (
+	// DefaultDirFileModeBeforeUmask is the default os.FileMode used when creating directories
+	DefaultDirFileModeBeforeUmask = os.FileMode(0700)

-func NewDefaultOptions() Options {
-	return Options{
-		MaxDatafileSize: DefaultMaxDatafileSize,
-		MaxKeySize:      DefaultMaxKeySize,
-		MaxValueSize:    DefaultMaxValueSize,
-	}
-}
+	// DefaultFileFileModeBeforeUmask is the default os.FileMode used when creating files
+	DefaultFileFileModeBeforeUmask = os.FileMode(0600)

-func WithMaxDatafileSize(size int) func(*Bitcask) error {
-	return func(b *Bitcask) error {
-		b.opts.MaxDatafileSize = size
+	// DefaultMaxDatafileSize is the default maximum datafile size in bytes
+	DefaultMaxDatafileSize = 1 << 20 // 1MB
+
+	// DefaultMaxKeySize is the default maximum key size in bytes
+	DefaultMaxKeySize = uint32(64) // 64 bytes
+
+	// DefaultMaxValueSize is the default value size in bytes
+	DefaultMaxValueSize = uint64(1 << 16) // 65KB
+
+	// DefaultSync is the default file synchronization action
+	DefaultSync = false
+
+	// DefaultAutoRecovery is the default auto-recovery action.
+
+	CurrentDBVersion = uint32(1)
+)
+
+// Option is a function that takes a config struct and modifies it
+type Option func(*config.Config) error
+
+func withConfig(src *config.Config) Option {
+	return func(cfg *config.Config) error {
+		cfg.MaxDatafileSize = src.MaxDatafileSize
+		cfg.MaxKeySize = src.MaxKeySize
+		cfg.MaxValueSize = src.MaxValueSize
+		cfg.Sync = src.Sync
+		cfg.AutoRecovery = src.AutoRecovery
+		cfg.DirFileModeBeforeUmask = src.DirFileModeBeforeUmask
+		cfg.FileFileModeBeforeUmask = src.FileFileModeBeforeUmask
 		return nil
 	}
 }

-func WithMaxKeySize(size int) func(*Bitcask) error {
-	return func(b *Bitcask) error {
-		b.opts.MaxKeySize = size
+// WithAutoRecovery sets auto recovery of data and index file recreation.
+// IMPORTANT: This flag MUST BE used only if a proper backup was made of all
+// the existing datafiles.
+func WithAutoRecovery(enabled bool) Option {
+	return func(cfg *config.Config) error {
+		cfg.AutoRecovery = enabled
 		return nil
 	}
 }

-func WithMaxValueSize(size int) func(*Bitcask) error {
-	return func(b *Bitcask) error {
-		b.opts.MaxValueSize = size
+// WithDirFileModeBeforeUmask sets the FileMode used for each new file created.
+func WithDirFileModeBeforeUmask(mode os.FileMode) Option {
+	return func(cfg *config.Config) error {
+		cfg.DirFileModeBeforeUmask = mode
 		return nil
 	}
 }
+
+// WithFileFileModeBeforeUmask sets the FileMode used for each new file created.
+func WithFileFileModeBeforeUmask(mode os.FileMode) Option {
+	return func(cfg *config.Config) error {
+		cfg.FileFileModeBeforeUmask = mode
+		return nil
+	}
+}
+
+// WithMaxDatafileSize sets the maximum datafile size option
+func WithMaxDatafileSize(size int) Option {
+	return func(cfg *config.Config) error {
+		cfg.MaxDatafileSize = size
+		return nil
+	}
+}
+
+// WithMaxKeySize sets the maximum key size option
+func WithMaxKeySize(size uint32) Option {
+	return func(cfg *config.Config) error {
+		cfg.MaxKeySize = size
+		return nil
+	}
+}
+
+// WithMaxValueSize sets the maximum value size option
+func WithMaxValueSize(size uint64) Option {
+	return func(cfg *config.Config) error {
+		cfg.MaxValueSize = size
+		return nil
+	}
+}
+
+// WithSync causes Sync() to be called on every key/value written increasing
+// durability and safety at the expense of performance
+func WithSync(sync bool) Option {
+	return func(cfg *config.Config) error {
+		cfg.Sync = sync
+		return nil
+	}
+}
+
+func newDefaultConfig() *config.Config {
+	return &config.Config{
+		MaxDatafileSize:         DefaultMaxDatafileSize,
+		MaxKeySize:              DefaultMaxKeySize,
+		MaxValueSize:            DefaultMaxValueSize,
+		Sync:                    DefaultSync,
+		DirFileModeBeforeUmask:  DefaultDirFileModeBeforeUmask,
+		FileFileModeBeforeUmask: DefaultFileFileModeBeforeUmask,
+		DBVersion:               CurrentDBVersion,
+	}
+}
--- a/proto/doc.go
+++ b/proto/doc.go
@ -1,3 +0,0 @@
-package proto
-
-//go:generate protoc --go_out=. entry.proto
--- a/proto/entry.pb.go
+++ b/proto/entry.pb.go
@ -1,108 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// source: entry.proto
-
-package proto
-
-import proto "github.com/golang/protobuf/proto"
-import fmt "fmt"
-import math "math"
-
-// Reference imports to suppress errors if they are not otherwise used.
-var _ = proto.Marshal
-var _ = fmt.Errorf
-var _ = math.Inf
-
-// This is a compile-time assertion to ensure that this generated file
-// is compatible with the proto package it is being compiled against.
-// A compilation error at this line likely means your copy of the
-// proto package needs to be updated.
-const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
-
-type Entry struct {
-	CRC                  uint32   `protobuf:"varint,1,opt,name=CRC,proto3" json:"CRC,omitempty"`
-	Key                  string   `protobuf:"bytes,2,opt,name=Key,proto3" json:"Key,omitempty"`
-	Index                int64    `protobuf:"varint,3,opt,name=Index,proto3" json:"Index,omitempty"`
-	Value                []byte   `protobuf:"bytes,4,opt,name=Value,proto3" json:"Value,omitempty"`
-	Timestamp            int64    `protobuf:"varint,5,opt,name=Timestamp,proto3" json:"Timestamp,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
-}
-
-func (m *Entry) Reset()         { *m = Entry{} }
-func (m *Entry) String() string { return proto.CompactTextString(m) }
-func (*Entry) ProtoMessage()    {}
-func (*Entry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_entry_4f5906245d08394f, []int{0}
-}
-func (m *Entry) XXX_Unmarshal(b []byte) error {
-	return xxx_messageInfo_Entry.Unmarshal(m, b)
-}
-func (m *Entry) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
-	return xxx_messageInfo_Entry.Marshal(b, m, deterministic)
-}
-func (dst *Entry) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Entry.Merge(dst, src)
-}
-func (m *Entry) XXX_Size() int {
-	return xxx_messageInfo_Entry.Size(m)
-}
-func (m *Entry) XXX_DiscardUnknown() {
-	xxx_messageInfo_Entry.DiscardUnknown(m)
-}
-
-var xxx_messageInfo_Entry proto.InternalMessageInfo
-
-func (m *Entry) GetCRC() uint32 {
-	if m != nil {
-		return m.CRC
-	}
-	return 0
-}
-
-func (m *Entry) GetKey() string {
-	if m != nil {
-		return m.Key
-	}
-	return ""
-}
-
-func (m *Entry) GetIndex() int64 {
-	if m != nil {
-		return m.Index
-	}
-	return 0
-}
-
-func (m *Entry) GetValue() []byte {
-	if m != nil {
-		return m.Value
-	}
-	return nil
-}
-
-func (m *Entry) GetTimestamp() int64 {
-	if m != nil {
-		return m.Timestamp
-	}
-	return 0
-}
-
-func init() {
-	proto.RegisterType((*Entry)(nil), "proto.Entry")
-}
-
-func init() { proto.RegisterFile("entry.proto", fileDescriptor_entry_4f5906245d08394f) }
-
-var fileDescriptor_entry_4f5906245d08394f = []byte{
-	// 134 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0xe2, 0x4e, 0xcd, 0x2b, 0x29,
-	0xaa, 0xd4, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x62, 0x05, 0x53, 0x4a, 0xa5, 0x5c, 0xac, 0xae,
-	0x20, 0x51, 0x21, 0x01, 0x2e, 0x66, 0xe7, 0x20, 0x67, 0x09, 0x46, 0x05, 0x46, 0x0d, 0xde, 0x20,
-	0x10, 0x13, 0x24, 0xe2, 0x9d, 0x5a, 0x29, 0xc1, 0xa4, 0xc0, 0xa8, 0xc1, 0x19, 0x04, 0x62, 0x0a,
-	0x89, 0x70, 0xb1, 0x7a, 0xe6, 0xa5, 0xa4, 0x56, 0x48, 0x30, 0x2b, 0x30, 0x6a, 0x30, 0x07, 0x41,
-	0x38, 0x20, 0xd1, 0xb0, 0xc4, 0x9c, 0xd2, 0x54, 0x09, 0x16, 0x05, 0x46, 0x0d, 0x9e, 0x20, 0x08,
-	0x47, 0x48, 0x86, 0x8b, 0x33, 0x24, 0x33, 0x37, 0xb5, 0xb8, 0x24, 0x31, 0xb7, 0x40, 0x82, 0x15,
-	0xac, 0x1e, 0x21, 0x90, 0xc4, 0x06, 0xb6, 0xdd, 0x18, 0x10, 0x00, 0x00, 0xff, 0xff, 0x07, 0x99,
-	0x47, 0xb9, 0x93, 0x00, 0x00, 0x00,
-}
--- a/proto/entry.proto
+++ b/proto/entry.proto
@ -1,11 +0,0 @@
-syntax = "proto3";
-
-package proto;
-
-message Entry {
-	uint32 CRC = 1;
-	string Key = 2;
-	int64 Index = 3;
-	bytes Value = 4;
-	int64 Timestamp = 5;
-}
--- a/scripts/migrations/v0_to_v1.go
+++ b/scripts/migrations/v0_to_v1.go
@ -0,0 +1,159 @@
+package migrations
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+
+	"git.mills.io/prologic/bitcask/internal"
+)
+
+const (
+	keySize                 = 4
+	valueSize               = 8
+	checksumSize            = 4
+	ttlSize                 = 8
+	defaultDatafileFilename = "%09d.data"
+)
+
+func ApplyV0ToV1(dir string, maxDatafileSize int) error {
+	temp, err := prepare(dir)
+	if err != nil {
+		return err
+	}
+	defer os.RemoveAll(temp)
+	err = apply(dir, temp, maxDatafileSize)
+	if err != nil {
+		return err
+	}
+	return cleanup(dir, temp)
+}
+
+func prepare(dir string) (string, error) {
+	return ioutil.TempDir(dir, "migration")
+}
+
+func apply(dir, temp string, maxDatafileSize int) error {
+	datafilesPath, err := internal.GetDatafiles(dir)
+	if err != nil {
+		return err
+	}
+	var id, newOffset int
+	datafile, err := getNewDatafile(temp, id)
+	if err != nil {
+		return err
+	}
+	id++
+	for _, p := range datafilesPath {
+		df, err := os.Open(p)
+		if err != nil {
+			return err
+		}
+		var off int64
+		for {
+			entry, err := getSingleEntry(df, off)
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				return err
+			}
+			if newOffset+len(entry) > maxDatafileSize {
+				err = datafile.Sync()
+				if err != nil {
+					return err
+				}
+				datafile, err = getNewDatafile(temp, id)
+				if err != nil {
+					return err
+				}
+				id++
+				newOffset = 0
+			}
+			newEntry := make([]byte, len(entry)+ttlSize)
+			copy(newEntry[:len(entry)], entry)
+			n, err := datafile.Write(newEntry)
+			if err != nil {
+				return err
+			}
+			newOffset += n
+			off += int64(len(entry))
+		}
+	}
+	return datafile.Sync()
+}
+
+func cleanup(dir, temp string) error {
+	files, err := ioutil.ReadDir(dir)
+	if err != nil {
+		return err
+	}
+	for _, file := range files {
+		if !file.IsDir() {
+			err := os.RemoveAll(path.Join([]string{dir, file.Name()}...))
+			if err != nil {
+				return err
+			}
+		}
+	}
+	files, err = ioutil.ReadDir(temp)
+	if err != nil {
+		return err
+	}
+	for _, file := range files {
+		err := os.Rename(
+			path.Join([]string{temp, file.Name()}...),
+			path.Join([]string{dir, file.Name()}...),
+		)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func getNewDatafile(path string, id int) (*os.File, error) {
+	fn := filepath.Join(path, fmt.Sprintf(defaultDatafileFilename, id))
+	return os.OpenFile(fn, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0640)
+}
+
+func getSingleEntry(f *os.File, offset int64) ([]byte, error) {
+	prefixBuf, err := readPrefix(f, offset)
+	if err != nil {
+		return nil, err
+	}
+	actualKeySize, actualValueSize := getKeyValueSize(prefixBuf)
+	entryBuf, err := read(f, uint64(actualKeySize)+actualValueSize+checksumSize, offset+keySize+valueSize)
+	if err != nil {
+		return nil, err
+	}
+	return append(prefixBuf, entryBuf...), nil
+}
+
+func readPrefix(f *os.File, offset int64) ([]byte, error) {
+	prefixBuf := make([]byte, keySize+valueSize)
+	_, err := f.ReadAt(prefixBuf, offset)
+	if err != nil {
+		return nil, err
+	}
+	return prefixBuf, nil
+}
+
+func read(f *os.File, bufSize uint64, offset int64) ([]byte, error) {
+	buf := make([]byte, bufSize)
+	_, err := f.ReadAt(buf, offset)
+	if err != nil {
+		return nil, err
+	}
+	return buf, nil
+}
+
+func getKeyValueSize(buf []byte) (uint32, uint64) {
+	actualKeySize := binary.BigEndian.Uint32(buf[:keySize])
+	actualValueSize := binary.BigEndian.Uint64(buf[keySize:])
+	return actualKeySize, actualValueSize
+}
--- a/scripts/migrations/v0_to_v1_test.go
+++ b/scripts/migrations/v0_to_v1_test.go
@ -0,0 +1,58 @@
+package migrations
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_ApplyV0ToV1(t *testing.T) {
+	assert := assert.New(t)
+	testdir, err := ioutil.TempDir("/tmp", "bitcask")
+	assert.NoError(err)
+	defer os.RemoveAll(testdir)
+	w0, err := os.OpenFile(filepath.Join(testdir, "000000000.data"), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0640)
+	assert.NoError(err)
+	w1, err := os.OpenFile(filepath.Join(testdir, "000000001.data"), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0640)
+	assert.NoError(err)
+	w2, err := os.OpenFile(filepath.Join(testdir, "000000002.data"), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0640)
+	assert.NoError(err)
+	defer w0.Close()
+	defer w1.Close()
+	defer w2.Close()
+	buf := make([]byte, 104)
+	binary.BigEndian.PutUint32(buf[:4], 5)
+	binary.BigEndian.PutUint64(buf[4:12], 7)
+	copy(buf[12:28], "mykeymyvalue0AAA")
+	binary.BigEndian.PutUint32(buf[28:32], 3)
+	binary.BigEndian.PutUint64(buf[32:40], 5)
+	copy(buf[40:52], "keyvalue0BBB")
+	_, err = w0.Write(buf[:52])
+	assert.NoError(err)
+	_, err = w1.Write(buf[:52])
+	assert.NoError(err)
+	_, err = w2.Write(buf[:52])
+	assert.NoError(err)
+	err = ApplyV0ToV1(testdir, 104)
+	assert.NoError(err)
+	r0, err := os.Open(filepath.Join(testdir, "000000000.data"))
+	assert.NoError(err)
+	defer r0.Close()
+	n, err := io.ReadFull(r0, buf)
+	assert.NoError(err)
+	assert.Equal(104, n)
+	assert.Equal("0000000500000000000000076d796b65796d7976616c75653041414100000000000000000000000300000000000000056b657976616c75653042424200000000000000000000000500000000000000076d796b65796d7976616c7565304141410000000000000000", hex.EncodeToString(buf))
+	r1, err := os.Open(filepath.Join(testdir, "000000001.data"))
+	assert.NoError(err)
+	defer r1.Close()
+	n, err = io.ReadFull(r1, buf[:100])
+	assert.NoError(err)
+	assert.Equal(100, n)
+	assert.Equal("0000000300000000000000056b657976616c75653042424200000000000000000000000500000000000000076d796b65796d7976616c75653041414100000000000000000000000300000000000000056b657976616c7565304242420000000000000000", hex.EncodeToString(buf[:100]))
+}
--- a/streampb/stream.go
+++ b/streampb/stream.go
@ -1,97 +0,0 @@
-package streampb
-
-import (
-	"bufio"
-	"encoding/binary"
-	"io"
-
-	"github.com/gogo/protobuf/proto"
-	"github.com/pkg/errors"
-)
-
-const (
-	// prefixSize is the number of bytes we preallocate for storing
-	// our big endian lenth prefix buffer.
-	prefixSize = 8
-)
-
-// NewEncoder creates a streaming protobuf encoder.
-func NewEncoder(w io.Writer) *Encoder {
-	return &Encoder{w: bufio.NewWriter(w)}
-}
-
-// Encoder wraps an underlying io.Writer and allows you to stream
-// proto encodings on it.
-type Encoder struct {
-	w *bufio.Writer
-}
-
-// Encode takes any proto.Message and streams it to the underlying writer.
-// Messages are framed with a length prefix.
-func (e *Encoder) Encode(msg proto.Message) (int64, error) {
-	prefixBuf := make([]byte, prefixSize)
-
-	buf, err := proto.Marshal(msg)
-	if err != nil {
-		return 0, err
-	}
-	binary.BigEndian.PutUint64(prefixBuf, uint64(len(buf)))
-
-	if _, err := e.w.Write(prefixBuf); err != nil {
-		return 0, errors.Wrap(err, "failed writing length prefix")
-	}
-
-	n, err := e.w.Write(buf)
-	if err != nil {
-		return 0, errors.Wrap(err, "failed writing marshaled data")
-	}
-
-	if err = e.w.Flush(); err != nil {
-		return 0, errors.Wrap(err, "failed flushing data")
-	}
-
-	return int64(n + prefixSize), nil
-}
-
-// NewDecoder creates a streaming protobuf decoder.
-func NewDecoder(r io.Reader) *Decoder {
-	return &Decoder{r: r}
-}
-
-// Decoder wraps an underlying io.Reader and allows you to stream
-// proto decodings on it.
-type Decoder struct {
-	r io.Reader
-}
-
-// Decode takes a proto.Message and unmarshals the next payload in the
-// underlying io.Reader. It returns an EOF when it's done.
-func (d *Decoder) Decode(v proto.Message) error {
-	prefixBuf := make([]byte, prefixSize)
-
-	_, err := io.ReadFull(d.r, prefixBuf)
-	if err != nil {
-		return err
-	}
-
-	n := binary.BigEndian.Uint64(prefixBuf)
-
-	buf := make([]byte, n)
-
-	idx := uint64(0)
-	for idx < n {
-		m, err := d.r.Read(buf[idx:n])
-		if err != nil {
-			return errors.Wrap(translateError(err), "failed reading marshaled data")
-		}
-		idx += uint64(m)
-	}
-	return proto.Unmarshal(buf[:n], v)
-}
-
-func translateError(err error) error {
-	if err == io.EOF {
-		return io.ErrUnexpectedEOF
-	}
-	return err
-}
--- a/tools/release.sh
+++ b/tools/release.sh
@ -1,16 +1,19 @@
-#!/bin/sh
+#!/bin/bash

 # Get the highest tag number
 VERSION="$(git describe --abbrev=0 --tags)"
 VERSION=${VERSION:-'0.0.0'}

 # Get number parts
-MAJOR="${VERSION%%.*}"; VERSION="${VERSION#*.}"
-MINOR="${VERSION%%.*}"; VERSION="${VERSION#*.}"
-PATCH="${VERSION%%.*}"; VERSION="${VERSION#*.}"
+MAJOR="${VERSION%%.*}"
+VERSION="${VERSION#*.}"
+MINOR="${VERSION%%.*}"
+VERSION="${VERSION#*.}"
+PATCH="${VERSION%%.*}"
+VERSION="${VERSION#*.}"

 # Increase version
-PATCH=$((PATCH+1))
+PATCH=$((PATCH + 1))

 TAG="${1}"

@ -20,6 +23,10 @@ fi

 echo "Releasing ${TAG} ..."

-git tag -a -s -m "Relase ${TAG}" "${TAG}"
-git push --tags
-goreleaser release --rm-dist
+git-chglog --next-tag="${TAG}" --output CHANGELOG.md
+git commit -a -m "Update CHANGELOG for ${TAG}"
+git tag -a -s -m "Release ${TAG}" "${TAG}"
+git push && git push --tags
+goreleaser release \
+  --rm-dist \
+  --release-notes <(git-chglog "${TAG}" | tail -n+5)
--- a/utils.go
+++ b/utils.go
@ -1,36 +0,0 @@
-package bitcask
-
-import (
-	"fmt"
-	"path/filepath"
-	"sort"
-	"strconv"
-	"strings"
-)
-
-func getDatafiles(path string) ([]string, error) {
-	fns, err := filepath.Glob(fmt.Sprintf("%s/*.data", path))
-	if err != nil {
-		return nil, err
-	}
-	sort.Strings(fns)
-	return fns, nil
-}
-
-func parseIds(fns []string) ([]int, error) {
-	var ids []int
-	for _, fn := range fns {
-		fn = filepath.Base(fn)
-		ext := filepath.Ext(fn)
-		if ext != ".data" {
-			continue
-		}
-		id, err := strconv.ParseInt(strings.TrimSuffix(fn, ext), 10, 32)
-		if err != nil {
-			return nil, err
-		}
-		ids = append(ids, int(id))
-	}
-	sort.Ints(ids)
-	return ids, nil
-}