Update CHANGELOG for v0.3.11

Ignore .envrc
Configure GoReleaser correctly
2026-04-02 11:09:01 -07:00 · 2021-07-10 22:15:25 +10:00 · 2021-07-10 22:14:05 +10:00 · 2021-07-10 21:40:29 +10:00 · 2021-07-10 18:11:47 +10:00 · 2021-07-10 18:08:07 +10:00
53 changed files with 3816 additions and 384 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
@@ -1,14 +0,0 @@
-kind: pipeline
-name: default
-
-steps:
-  - name: build
-    image: golang:latest
-    commands:
-      - go test -v -cover -coverprofile=coverage.txt -covermode=atomic -coverpkg=$(shell go list) -race .
-
-  - name: coverage
-    image: plugins/codecov
-    settings:
-      token:
-        from_secret: codecov-token
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1,2 +0,0 @@
-github: prologic
-patreon: prologic
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,14 @@
 *~*
-*.bak
 *.db
+*.bak
+**.envrc

-/coverage.txt
-/bitcask
-/bitcaskd
 /tmp
 /dist
+/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 github.com/prologic/bitcask/internal.Version={{.Version}} -X github.com/prologic/bitcask/internal.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 github.com/prologic/bitcask/internal.Version={{.Version}} -X github.com/prologic/bitcask/internal.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/6
+++ b/6
@@ -2,12 +2,18 @@
 #   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>
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -0,0 +1,413 @@
+
+<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)
+
+
+<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/2
+++ b/2
@@ -37,7 +37,7 @@ profile: build
 	@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
--- a/README.md
+++ b/README.md
@@ -1,66 +1,129 @@
 # bitcask

-[![Build Status](https://cloud.drone.io/api/badges/prologic/bitcask/status.svg)](https://cloud.drone.io/prologic/bitcask)
+![](https://git.mills.io/prologic/bitcask/workflows/Coverage/badge.svg)
+![](https://git.mills.io/prologic/bitcask/workflows/Docker/badge.svg)
+![](https://git.mills.io/prologic/bitcask/workflows/Go/badge.svg)
+![](https://git.mills.io/prologic/bitcask/workflows/ReviewDog/badge.svg)
+
 [![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)
 [![codebeat badge](https://codebeat.co/badges/15fba8a5-3044-4f40-936f-9e0f5d5d1fd9)](https://codebeat.co/projects/github-com-prologic-bitcask-master)
-[![GoDoc](https://godoc.org/github.com/prologic/bitcask?status.svg)](https://godoc.org/github.com/prologic/bitcask) 
-[![GitHub license](https://img.shields.io/github/license/prologic/bitcask.svg)](https://github.com/prologic/bitcask)
-[![Sourcegraph](https://sourcegraph.com/github.com/prologic/bitcask/-/badge.svg)](https://sourcegraph.com/github.com/prologic/bitcask?badge)
+[![GoDoc](https://godoc.org/git.mills.io/prologic/bitcask?status.svg)](https://godoc.org/git.mills.io/prologic/bitcask) 
+[![GitHub license](https://img.shields.io/github/license/prologic/bitcask.svg)](https://git.mills.io/prologic/bitcask)
+[![Sourcegraph](https://sourcegraph.com/git.mills.io/prologic/bitcask/-/badge.svg)](https://sourcegraph.com/git.mills.io/prologic/bitcask?badge)
+[![TODOs](https://img.shields.io/endpoint?url=https://api.tickgit.com/badge?repo=git.mills.io/prologic/bitcask)](https://www.tickgit.com/browse?repo=git.mills.io/prologic/bitcask)

 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://github.com/prologic/bitraft) which uses this library as its backend. Use [Bitcask](https://github.com/prologic/bitcask) as a starting point or if you want to embed in your application, use [Bitraft](https://github.com/prologic/bitraft) if you need a complete server/client solution with high availability with a Redis-compatible API.
+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 (`import "github.com/prologic/bitcask"`)
+* Embedded (`import "git.mills.io/prologic/bitcask"`)
 * Builtin CLI (`bitcask`)
 * Builtin Redis-compatible server (`bitcaskd`)
 * Predictable read/write 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://github.com/prologic/bitcask.git
+```sh
+$ git clone https://git.mills.io/prologic/bitcask.git
 $ make
 ```

 ## Install

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

 ## Usage (library)

 Install the package into your project:

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

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

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

 func main() {
    db, _ := bitcask.Open("/tmp/db")
    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)

-```#!sh
+```sh
 $ bitcask -p /tmp/db set Hello World
 $ bitcask -p /tmp/db get Hello
 World
@@ -70,14 +133,14 @@ World

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

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

 Example session:

-```#!sh
+```sh
 $ telnet localhost 6379
 Trying ::1...
 Connected to localhost.
@@ -102,21 +165,21 @@ Connection closed by foreign host.

 You can also use the [Bitcask Docker Image](https://cloud.docker.com/u/prologic/repository/docker/prologic/bitcask):

-```#!sh
+```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
+```sh
 $ make bench
 ...
 goos: darwin
 goarch: amd64
-pkg: github.com/prologic/bitcask
+pkg: git.mills.io/prologic/bitcask

 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
@@ -158,24 +221,39 @@ For 128B values:

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

-## Stargazers over time
-
-[![Stargazers over time](https://starcharts.herokuapp.com/prologic/bitcask.svg)](https://starcharts.herokuapp.com/prologic/bitcask)
-
 ## Support

 Support the ongoing development of Bitcask!

-**Sponser**
+**Sponsor**

 - Become a [Sponsor](https://www.patreon.com/prologic)

+## Stargazers over time
+
+[![Stargazers over time](https://starcharts.herokuapp.com/prologic/bitcask.svg)](https://starcharts.herokuapp.com/prologic/bitcask)
+
 ## 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 contriibute a PR please consider adding your name there. There is also Github's own [Contributors](https://github.com/prologic/bitcask/graphs/contributors) statistics.
+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. There is also GitHub's own [Contributors](https://git.mills.io/prologic/bitcask/graphs/contributors) statistics.
+
+[![](https://sourcerer.io/fame/prologic/prologic/bitcask/images/0)](https://sourcerer.io/fame/prologic/prologic/bitcask/links/0)
+[![](https://sourcerer.io/fame/prologic/prologic/bitcask/images/1)](https://sourcerer.io/fame/prologic/prologic/bitcask/links/1)
+[![](https://sourcerer.io/fame/prologic/prologic/bitcask/images/2)](https://sourcerer.io/fame/prologic/prologic/bitcask/links/2)
+[![](https://sourcerer.io/fame/prologic/prologic/bitcask/images/3)](https://sourcerer.io/fame/prologic/prologic/bitcask/links/3)
+[![](https://sourcerer.io/fame/prologic/prologic/bitcask/images/4)](https://sourcerer.io/fame/prologic/prologic/bitcask/links/4)
+[![](https://sourcerer.io/fame/prologic/prologic/bitcask/images/5)](https://sourcerer.io/fame/prologic/prologic/bitcask/links/5)
+[![](https://sourcerer.io/fame/prologic/prologic/bitcask/images/6)](https://sourcerer.io/fame/prologic/prologic/bitcask/links/6)
+[![](https://sourcerer.io/fame/prologic/prologic/bitcask/images/7)](https://sourcerer.io/fame/prologic/prologic/bitcask/links/7)
+
+## 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 term of 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
@@ -2,20 +2,32 @@ package bitcask

 import (
 	"errors"
+	"fmt"
 	"hash/crc32"
 	"io"
 	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
+	"sort"
 	"sync"
+	"time"

-	"github.com/gofrs/flock"
 	art "github.com/plar/go-adaptive-radix-tree"
-	"github.com/prologic/bitcask/internal"
-	"github.com/prologic/bitcask/internal/config"
-	"github.com/prologic/bitcask/internal/data"
-	"github.com/prologic/bitcask/internal/index"
+	"git.mills.io/prologic/bitcask/flock"
+	"git.mills.io/prologic/bitcask/internal"
+	"git.mills.io/prologic/bitcask/internal/config"
+	"git.mills.io/prologic/bitcask/internal/data"
+	"git.mills.io/prologic/bitcask/internal/data/codec"
+	"git.mills.io/prologic/bitcask/internal/index"
+	"git.mills.io/prologic/bitcask/internal/metadata"
+	"git.mills.io/prologic/bitcask/scripts/migrations"
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	lockfile     = "lock"
+	ttlIndexFile = "ttl_index"
 )

 var (
@@ -26,6 +38,13 @@ var (
 	// 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")
@@ -37,6 +56,12 @@ var (
 	// ErrDatabaseLocked is the error returned if the database is locked
 	// (typically opened by another process)
 	ErrDatabaseLocked = errors.New("error: database locked")
+
+	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")
 )

 // Bitcask is a struct that represents a on-disk LSM and WAL data structure
@@ -47,13 +72,17 @@ type Bitcask struct {

 	*flock.Flock

-	config    *config.Config
-	options   []Option
-	path      string
-	curr      data.Datafile
-	datafiles map[int]data.Datafile
-	trie      art.Tree
-	indexer   index.Indexer
+	config     *config.Config
+	options    []Option
+	path       string
+	curr       data.Datafile
+	datafiles  map[int]data.Datafile
+	trie       art.Tree
+	indexer    index.Indexer
+	ttlIndexer index.Indexer
+	ttlIndex   art.Tree
+	metadata   *metadata.MetaData
+	isMerging  bool
 }

 // Stats is a struct returned by Stats() on an open Bitcask instance
@@ -82,12 +111,22 @@ func (b *Bitcask) Stats() (stats Stats, err error) {
 // Close() as this is the only way to cleanup the lock held by the open
 // database.
 func (b *Bitcask) Close() error {
+	b.mu.RLock()
 	defer func() {
+		b.mu.RUnlock()
 		b.Flock.Unlock()
-		os.Remove(b.Flock.Path())
 	}()

-	if err := b.indexer.Save(b.trie, filepath.Join(b.path, "index")); err != nil {
+	return b.close()
+}
+
+func (b *Bitcask) close() error {
+	if err := b.saveIndexes(); err != nil {
+		return err
+	}
+
+	b.metadata.IndexUpToDate = true
+	if err := b.saveMetadata(); err != nil {
 		return err
 	}

@@ -102,96 +141,160 @@ func (b *Bitcask) Close() error {

 // Sync flushes all buffers to disk ensuring all data is written
 func (b *Bitcask) Sync() error {
+	b.mu.RLock()
+	defer b.mu.RUnlock()
+
+	if err := b.saveMetadata(); err != nil {
+		return err
+	}
+
 	return b.curr.Sync()
 }

-// Get retrieves the value of the given key. If the key is not found or an/I/O
-// error occurs a null byte slice is returned along with the error.
+// Get fetches value for a key
 func (b *Bitcask) Get(key []byte) ([]byte, error) {
-	var df data.Datafile
-
 	b.mu.RLock()
-	value, found := b.trie.Search(key)
-	if !found {
-		b.mu.RUnlock()
-		return nil, ErrKeyNotFound
-	}
-
-	item := value.(internal.Item)
-
-	if item.FileID == b.curr.FileID() {
-		df = b.curr
-	} else {
-		df = b.datafiles[item.FileID]
-	}
-
-	e, err := df.ReadAt(item.Offset, item.Size)
-	b.mu.RUnlock()
+	defer b.mu.RUnlock()
+	e, err := b.get(key)
 	if err != nil {
 		return nil, err
 	}
-
-	checksum := crc32.ChecksumIEEE(e.Value)
-	if checksum != e.Checksum {
-		return nil, ErrChecksumFailed
-	}
-
 	return e.Value, nil
 }

 // Has returns true if the key exists in the database, false otherwise.
 func (b *Bitcask) Has(key []byte) bool {
 	b.mu.RLock()
+	defer b.mu.RUnlock()
 	_, found := b.trie.Search(key)
-	b.mu.RUnlock()
+	if found {
+		return !b.isExpired(key)
+	}
 	return found
 }

 // Put stores the key and value in the database.
 func (b *Bitcask) Put(key, value []byte) error {
-	if uint32(len(key)) > b.config.MaxKeySize {
+	if len(key) == 0 {
+		return ErrEmptyKey
+	}
+	if b.config.MaxKeySize > 0 && uint32(len(key)) > b.config.MaxKeySize {
 		return ErrKeyTooLarge
 	}
-	if uint64(len(value)) > b.config.MaxValueSize {
+	if b.config.MaxValueSize > 0 && uint64(len(value)) > b.config.MaxValueSize {
 		return ErrValueTooLarge
 	}

 	b.mu.Lock()
+	defer b.mu.Unlock()
 	offset, n, err := b.put(key, value)
 	if err != nil {
-		b.mu.Unlock()
 		return err
 	}

 	if b.config.Sync {
 		if err := b.curr.Sync(); err != nil {
-			b.mu.Unlock()
 			return err
 		}
 	}

+	// in case of successful `put`, IndexUpToDate will be always be false
+	b.metadata.IndexUpToDate = false
+
+	if oldItem, found := b.trie.Search(key); found {
+		b.metadata.ReclaimableSpace += oldItem.(internal.Item).Size
+	}
+
 	item := internal.Item{FileID: b.curr.FileID(), Offset: offset, Size: n}
 	b.trie.Insert(key, item)
-	b.mu.Unlock()

 	return nil
 }

-// Delete deletes the named key. If the key doesn't exist or an I/O error
-// occurs the error is returned.
-func (b *Bitcask) Delete(key []byte) error {
+// PutWithTTL stores the key and value in the database with the given TTL
+func (b *Bitcask) PutWithTTL(key, value []byte, ttl time.Duration) error {
+	if len(key) == 0 {
+		return ErrEmptyKey
+	}
+	if b.config.MaxKeySize > 0 && uint32(len(key)) > b.config.MaxKeySize {
+		return ErrKeyTooLarge
+	}
+	if b.config.MaxValueSize > 0 && uint64(len(value)) > b.config.MaxValueSize {
+		return ErrValueTooLarge
+	}
+
+	expiry := time.Now().Add(ttl)
+
 	b.mu.Lock()
-	_, _, err := b.put(key, []byte{})
+	defer b.mu.Unlock()
+	offset, n, err := b.putWithExpiry(key, value, expiry)
 	if err != nil {
-		b.mu.Unlock()
 		return err
 	}
-	b.trie.Delete(key)
-	b.mu.Unlock()
+
+	if b.config.Sync {
+		if err := b.curr.Sync(); err != nil {
+			return err
+		}
+	}
+
+	// in case of successful `put`, IndexUpToDate will be always be false
+	b.metadata.IndexUpToDate = false
+
+	if oldItem, found := b.trie.Search(key); found {
+		b.metadata.ReclaimableSpace += oldItem.(internal.Item).Size
+	}
+
+	item := internal.Item{FileID: b.curr.FileID(), Offset: offset, Size: n}
+	b.trie.Insert(key, item)
+	b.ttlIndex.Insert(key, expiry)

 	return nil
 }

+// Delete deletes the named key.
+func (b *Bitcask) Delete(key []byte) error {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	return b.delete(key)
+}
+
+// delete deletes the named key. If the key doesn't exist or an I/O error
+// occurs the error is returned.
+func (b *Bitcask) delete(key []byte) error {
+	_, _, err := b.put(key, []byte{})
+	if err != nil {
+		return err
+	}
+	if item, found := b.trie.Search(key); found {
+		b.metadata.ReclaimableSpace += item.(internal.Item).Size + codec.MetaInfoSize + int64(len(key))
+	}
+	b.trie.Delete(key)
+	b.ttlIndex.Delete(key)
+
+	return nil
+}
+
+// DeleteAll deletes all the keys. If an I/O error occurs the error is returned.
+func (b *Bitcask) DeleteAll() (err error) {
+	b.mu.RLock()
+	defer b.mu.RUnlock()
+
+	b.trie.ForEach(func(node art.Node) bool {
+		_, _, err = b.put(node.Key(), []byte{})
+		if err != nil {
+			return false
+		}
+		item, _ := b.trie.Search(node.Key())
+		b.metadata.ReclaimableSpace += item.(internal.Item).Size + codec.MetaInfoSize + int64(len(node.Key()))
+		return true
+	})
+	b.trie = art.New()
+	b.ttlIndex = art.New()
+
+	return
+}
+
 // Scan performs a prefix scan of keys matching the given prefix and calling
 // the function `f` with the keys found. If the function returns an error
 // no further keys are processed and the first error returned.
@@ -226,6 +329,9 @@ func (b *Bitcask) Keys() chan []byte {

 		for it := b.trie.Iterator(); it.HasNext(); {
 			node, _ := it.Next()
+			if b.isExpired(node.Key()) {
+				continue
+			}
 			ch <- node.Key()
 		}
 		close(ch)
@@ -234,6 +340,28 @@ func (b *Bitcask) Keys() chan []byte {
 	return ch
 }

+// RunGC deletes all expired keys
+func (b *Bitcask) RunGC() error {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	return b.runGC()
+}
+
+// runGC deletes all keys that are expired
+// caller function should take care of the locking when calling this method
+func (b *Bitcask) runGC() (err error) {
+	b.ttlIndex.ForEach(func(node art.Node) (cont bool) {
+		if !b.isExpired(node.Key()) {
+			return true
+		}
+		if err = b.delete(node.Key()); err != nil {
+			return false
+		}
+		return true
+	})
+	return
+}
+
 // Fold iterates over all keys in the database calling the function `f` for
 // each key. If the function returns an error, no further keys are processed
 // and the error returned.
@@ -251,56 +379,178 @@ func (b *Bitcask) Fold(f func(key []byte) error) (err error) {
 	return
 }

-func (b *Bitcask) put(key, value []byte) (int64, int64, error) {
-	size := b.curr.Size()
-	if size >= int64(b.config.MaxDatafileSize) {
-		err := b.curr.Close()
-		if err != nil {
-			return -1, 0, err
-		}
+// get retrieves the value of the given key
+func (b *Bitcask) get(key []byte) (internal.Entry, error) {
+	var df data.Datafile

-		id := b.curr.FileID()
-
-		df, err := data.NewDatafile(b.path, id, true, b.config.MaxKeySize, b.config.MaxValueSize)
-		if err != nil {
-			return -1, 0, err
-		}
-
-		b.datafiles[id] = df
-
-		id = b.curr.FileID() + 1
-		curr, err := data.NewDatafile(b.path, id, false, b.config.MaxKeySize, b.config.MaxValueSize)
-		if err != nil {
-			return -1, 0, err
-		}
-		b.curr = curr
+	value, found := b.trie.Search(key)
+	if !found {
+		return internal.Entry{}, ErrKeyNotFound
+	}
+	if expired := b.isExpired(key); expired {
+		_ = b.delete(key) // we don't care if it doesnt succeed
+		return internal.Entry{}, ErrKeyExpired
 	}

-	e := internal.NewEntry(key, value)
-	return b.curr.Write(e)
+	item := value.(internal.Item)
+
+	if item.FileID == b.curr.FileID() {
+		df = b.curr
+	} else {
+		df = b.datafiles[item.FileID]
+	}
+
+	e, err := df.ReadAt(item.Offset, item.Size)
+	if err != nil {
+		return internal.Entry{}, err
+	}
+
+	checksum := crc32.ChecksumIEEE(e.Value)
+	if checksum != e.Checksum {
+		return internal.Entry{}, ErrChecksumFailed
+	}
+
+	return e, nil
 }

-func (b *Bitcask) reopen() error {
+func (b *Bitcask) maybeRotate() error {
+	size := b.curr.Size()
+	if size < int64(b.config.MaxDatafileSize) {
+		return nil
+	}
+
+	err := b.curr.Close()
+	if err != nil {
+		return err
+	}
+
+	id := b.curr.FileID()
+
+	df, err := data.NewDatafile(
+		b.path, id, true,
+		b.config.MaxKeySize,
+		b.config.MaxValueSize,
+		b.config.FileFileModeBeforeUmask,
+	)
+	if err != nil {
+		return err
+	}
+
+	b.datafiles[id] = df
+
+	id = b.curr.FileID() + 1
+	curr, err := data.NewDatafile(
+		b.path, id, false,
+		b.config.MaxKeySize,
+		b.config.MaxValueSize,
+		b.config.FileFileModeBeforeUmask,
+	)
+	if err != nil {
+		return err
+	}
+	b.curr = curr
+	err = b.saveIndexes()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// put inserts a new (key, value). Both key and value are valid inputs.
+func (b *Bitcask) put(key, value []byte) (int64, int64, error) {
+	if err := b.maybeRotate(); err != nil {
+		return -1, 0, fmt.Errorf("error rotating active datafile: %w", err)
+	}
+
+	return b.curr.Write(internal.NewEntry(key, value, nil))
+}
+
+// putWithExpiry inserts a new (key, value, expiry).
+// Both key and value are valid inputs.
+func (b *Bitcask) putWithExpiry(key, value []byte, expiry time.Time) (int64, int64, error) {
+	if err := b.maybeRotate(); err != nil {
+		return -1, 0, fmt.Errorf("error rotating active datafile: %w", err)
+	}
+
+	return b.curr.Write(internal.NewEntry(key, value, &expiry))
+}
+
+// closeCurrentFile closes current datafile and makes it read only.
+func (b *Bitcask) closeCurrentFile() error {
+	if err := b.curr.Close(); err != nil {
+		return err
+	}
+
+	id := b.curr.FileID()
+	df, err := data.NewDatafile(
+		b.path, id, true,
+		b.config.MaxKeySize,
+		b.config.MaxValueSize,
+		b.config.FileFileModeBeforeUmask,
+	)
+	if err != nil {
+		return err
+	}
+
+	b.datafiles[id] = df
+	return nil
+}
+
+// openNewWritableFile opens new datafile for writing data
+func (b *Bitcask) openNewWritableFile() error {
+	id := b.curr.FileID() + 1
+	curr, err := data.NewDatafile(
+		b.path, id, false,
+		b.config.MaxKeySize,
+		b.config.MaxValueSize,
+		b.config.FileFileModeBeforeUmask,
+	)
+	if err != nil {
+		return err
+	}
+	b.curr = curr
+	return nil
+}
+
+// Reopen closes and reopsns the database
+func (b *Bitcask) Reopen() error {
 	b.mu.Lock()
 	defer b.mu.Unlock()

-	datafiles, lastID, err := loadDatafiles(b.path, b.config.MaxKeySize, b.config.MaxValueSize)
+	return b.reopen()
+}
+
+// reopen reloads a bitcask object with index and datafiles
+// caller of this method should take care of locking
+func (b *Bitcask) reopen() error {
+	datafiles, lastID, err := loadDatafiles(
+		b.path,
+		b.config.MaxKeySize,
+		b.config.MaxValueSize,
+		b.config.FileFileModeBeforeUmask,
+	)
+	if err != nil {
+		return err
+	}
+	t, ttlIndex, err := loadIndexes(b, datafiles, lastID)
 	if err != nil {
 		return err
 	}

-	t, err := loadIndex(b.path, b.indexer, b.config.MaxKeySize, datafiles)
-	if err != nil {
-		return err
-	}
-
-	curr, err := data.NewDatafile(b.path, lastID, false, b.config.MaxKeySize, b.config.MaxValueSize)
+	curr, err := data.NewDatafile(
+		b.path, lastID, false,
+		b.config.MaxKeySize,
+		b.config.MaxValueSize,
+		b.config.FileFileModeBeforeUmask,
+	)
 	if err != nil {
 		return err
 	}

 	b.trie = t
 	b.curr = curr
+	b.ttlIndex = ttlIndex
 	b.datafiles = datafiles

 	return nil
@@ -310,6 +560,34 @@ func (b *Bitcask) reopen() error {
 // and deleted keys removes. Duplicate key/value pairs are also removed.
 // Call this function periodically to reclaim disk space.
 func (b *Bitcask) Merge() error {
+	b.mu.Lock()
+	if b.isMerging {
+		b.mu.Unlock()
+		return ErrMergeInProgress
+	}
+	b.isMerging = true
+	b.mu.Unlock()
+	defer func() {
+		b.isMerging = false
+	}()
+	b.mu.RLock()
+	err := b.closeCurrentFile()
+	if err != nil {
+		b.mu.RUnlock()
+		return err
+	}
+	filesToMerge := make([]int, 0, len(b.datafiles))
+	for k := range b.datafiles {
+		filesToMerge = append(filesToMerge, k)
+	}
+	err = b.openNewWritableFile()
+	if err != nil {
+		b.mu.RUnlock()
+		return err
+	}
+	b.mu.RUnlock()
+	sort.Ints(filesToMerge)
+
 	// Temporary merged database path
 	temp, err := ioutil.TempDir(b.path, "merge")
 	if err != nil {
@@ -318,7 +596,7 @@ func (b *Bitcask) Merge() error {
 	defer os.RemoveAll(temp)

 	// Create a merged database
-	mdb, err := Open(temp, b.options...)
+	mdb, err := Open(temp, withConfig(b.config))
 	if err != nil {
 		return err
 	}
@@ -327,13 +605,24 @@ func (b *Bitcask) Merge() error {
 	// Doing this automatically strips deleted keys and
 	// old key/value pairs
 	err = b.Fold(func(key []byte) error {
-		value, err := b.Get(key)
+		item, _ := b.trie.Search(key)
+		// if key was updated after start of merge operation, nothing to do
+		if item.(internal.Item).FileID > filesToMerge[len(filesToMerge)-1] {
+			return nil
+		}
+		e, err := b.get(key)
 		if err != nil {
 			return err
 		}

-		if err := mdb.Put(key, value); err != nil {
-			return err
+		if e.Expiry != nil {
+			if err := mdb.PutWithTTL(key, e.Value, time.Until(*e.Expiry)); err != nil {
+				return err
+			}
+		} else {
+			if err := mdb.Put(key, e.Value); err != nil {
+				return err
+			}
 		}

 		return nil
@@ -341,29 +630,36 @@ func (b *Bitcask) Merge() error {
 	if err != nil {
 		return err
 	}
-
-	err = mdb.Close()
-	if err != nil {
+	if err = mdb.Close(); err != nil {
+		return err
+	}
+	// no reads and writes till we reopen
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	if err = b.close(); err != nil {
 		return err
 	}

-	// Close the database
-	err = b.Close()
-	if err != nil {
-		return err
-	}
-
-	// Remove all data files
+	// Remove data files
 	files, err := ioutil.ReadDir(b.path)
 	if err != nil {
 		return err
 	}
 	for _, file := range files {
-		if !file.IsDir() {
-			err := os.RemoveAll(path.Join([]string{b.path, file.Name()}...))
-			if err != nil {
-				return err
-			}
+		if file.IsDir() || file.Name() == lockfile {
+			continue
+		}
+		ids, err := internal.ParseIds([]string{file.Name()})
+		if err != nil {
+			return err
+		}
+		// if datafile was created after start of merge, skip
+		if len(ids) > 0 && ids[0] > filesToMerge[len(filesToMerge)-1] {
+			continue
+		}
+		err = os.RemoveAll(path.Join(b.path, file.Name()))
+		if err != nil {
+			return err
 		}
 	}

@@ -381,6 +677,7 @@ func (b *Bitcask) Merge() error {
 			return err
 		}
 	}
+	b.metadata.ReclaimableSpace = 0

 	// And finally reopen the database
 	return b.reopen()
@@ -391,14 +688,11 @@ func (b *Bitcask) Merge() error {
 // configuration options as functions.
 func Open(path string, options ...Option) (*Bitcask, error) {
 	var (
-		cfg *config.Config
-		err error
+		cfg  *config.Config
+		err  error
+		meta *metadata.MetaData
 	)

-	if err := os.MkdirAll(path, 0755); err != nil {
-		return nil, err
-	}
-
 	configPath := filepath.Join(path, "config.json")
 	if internal.Exists(configPath) {
 		cfg, err = config.Load(configPath)
@@ -409,20 +703,35 @@ func Open(path string, options ...Option) (*Bitcask, error) {
 		cfg = newDefaultConfig()
 	}

-	bitcask := &Bitcask{
-		Flock:   flock.New(filepath.Join(path, "lock")),
-		config:  cfg,
-		options: options,
-		path:    path,
-		indexer: index.NewIndexer(),
+	if err := checkAndUpgrade(cfg, configPath); err != nil {
+		return nil, err
 	}

 	for _, opt := range options {
-		if err := opt(bitcask.config); err != nil {
+		if err := opt(cfg); err != nil {
 			return nil, err
 		}
 	}

+	if err := os.MkdirAll(path, cfg.DirFileModeBeforeUmask); err != nil {
+		return nil, err
+	}
+
+	meta, err = loadMetadata(path)
+	if err != nil {
+		return nil, err
+	}
+
+	bitcask := &Bitcask{
+		Flock:      flock.New(filepath.Join(path, lockfile)),
+		config:     cfg,
+		options:    options,
+		path:       path,
+		indexer:    index.NewIndexer(),
+		ttlIndexer: index.NewTTLIndexer(),
+		metadata:   meta,
+	}
+
 	locked, err := bitcask.Flock.TryLock()
 	if err != nil {
 		return nil, err
@@ -436,14 +745,83 @@ func Open(path string, options ...Option) (*Bitcask, error) {
 		return nil, err
 	}

-	if err := bitcask.reopen(); err != nil {
+	if cfg.AutoRecovery {
+		if err := data.CheckAndRecover(path, cfg); err != nil {
+			return nil, fmt.Errorf("recovering database: %s", err)
+		}
+	}
+	if err := bitcask.Reopen(); err != nil {
 		return nil, err
 	}

 	return bitcask, nil
 }

-func loadDatafiles(path string, maxKeySize uint32, maxValueSize uint64) (datafiles map[int]data.Datafile, lastID int, err error) {
+// checkAndUpgrade checks if DB upgrade is required
+// if yes, then applies version upgrade and saves updated config
+func checkAndUpgrade(cfg *config.Config, configPath string) error {
+	if cfg.DBVersion == CurrentDBVersion {
+		return nil
+	}
+	if cfg.DBVersion > CurrentDBVersion {
+		return ErrInvalidVersion
+	}
+	// for v0 to v1 upgrade, we need to append 8 null bytes after each encoded entry in datafiles
+	if cfg.DBVersion == uint32(0) && CurrentDBVersion == uint32(1) {
+		log.Warn("upgrading db version, might take some time....")
+		cfg.DBVersion = CurrentDBVersion
+		return migrations.ApplyV0ToV1(filepath.Dir(configPath), cfg.MaxDatafileSize)
+	}
+	return nil
+}
+
+// Backup copies db directory to given path
+// it creates path if it does not exist
+func (b *Bitcask) Backup(path string) error {
+	if !internal.Exists(path) {
+		if err := os.MkdirAll(path, b.config.DirFileModeBeforeUmask); err != nil {
+			return err
+		}
+	}
+	return internal.Copy(b.path, path, []string{lockfile})
+}
+
+// saveIndex saves index and ttl_index currently in RAM to disk
+func (b *Bitcask) saveIndexes() error {
+	tempIdx := "temp_index"
+	if err := b.indexer.Save(b.trie, filepath.Join(b.path, tempIdx)); err != nil {
+		return err
+	}
+	if err := os.Rename(filepath.Join(b.path, tempIdx), filepath.Join(b.path, "index")); err != nil {
+		return err
+	}
+	if err := b.ttlIndexer.Save(b.ttlIndex, filepath.Join(b.path, tempIdx)); err != nil {
+		return err
+	}
+	return os.Rename(filepath.Join(b.path, tempIdx), filepath.Join(b.path, ttlIndexFile))
+}
+
+// saveMetadata saves metadata into disk
+func (b *Bitcask) saveMetadata() error {
+	return b.metadata.Save(filepath.Join(b.path, "meta.json"), b.config.DirFileModeBeforeUmask)
+}
+
+// Reclaimable returns space that can be reclaimed
+func (b *Bitcask) Reclaimable() int64 {
+	return b.metadata.ReclaimableSpace
+}
+
+// isExpired returns true if a key has expired
+// it returns false if key does not exist in ttl index
+func (b *Bitcask) isExpired(key []byte) bool {
+	expiry, found := b.ttlIndex.Search(key)
+	if !found {
+		return false
+	}
+	return expiry.(time.Time).Before(time.Now().UTC())
+}
+
+func loadDatafiles(path string, maxKeySize uint32, maxValueSize uint64, fileModeBeforeUmask os.FileMode) (datafiles map[int]data.Datafile, lastID int, err error) {
 	fns, err := internal.GetDatafiles(path)
 	if err != nil {
 		return nil, 0, err
@@ -456,7 +834,12 @@ func loadDatafiles(path string, maxKeySize uint32, maxValueSize uint64) (datafil

 	datafiles = make(map[int]data.Datafile, len(ids))
 	for _, id := range ids {
-		datafiles[id], err = data.NewDatafile(path, id, true, maxKeySize, maxValueSize)
+		datafiles[id], err = data.NewDatafile(
+			path, id, true,
+			maxKeySize,
+			maxValueSize,
+			fileModeBeforeUmask,
+		)
 		if err != nil {
 			return
 		}
@@ -468,34 +851,79 @@ func loadDatafiles(path string, maxKeySize uint32, maxValueSize uint64) (datafil
 	return
 }

-func loadIndex(path string, indexer index.Indexer, maxKeySize uint32, datafiles map[int]data.Datafile) (art.Tree, error) {
-	t, found, err := indexer.Load(filepath.Join(path, "index"), maxKeySize)
-	if err != nil {
-		return nil, err
+func getSortedDatafiles(datafiles map[int]data.Datafile) []data.Datafile {
+	out := make([]data.Datafile, len(datafiles))
+	idx := 0
+	for _, df := range datafiles {
+		out[idx] = df
+		idx++
 	}
-	if !found {
-		for _, df := range datafiles {
-			var offset int64
-			for {
-				e, n, err := df.Read()
-				if err != nil {
-					if err == io.EOF {
-						break
-					}
-					return nil, err
-				}
+	sort.Slice(out, func(i, j int) bool {
+		return out[i].FileID() < out[j].FileID()
+	})
+	return out
+}

-				// Tombstone value  (deleted key)
-				if len(e.Value) == 0 {
-					t.Delete(e.Key)
-					offset += n
-					continue
-				}
-				item := internal.Item{FileID: df.FileID(), Offset: offset, Size: n}
-				t.Insert(e.Key, item)
-				offset += n
-			}
+// loadIndexes loads index from disk to memory. If index is not available or partially available (last bitcask process crashed)
+// then it iterates over last datafile and construct index
+// we construct ttl_index here also along with normal index
+func loadIndexes(b *Bitcask, datafiles map[int]data.Datafile, lastID int) (art.Tree, art.Tree, error) {
+	t, found, err := b.indexer.Load(filepath.Join(b.path, "index"), b.config.MaxKeySize)
+	if err != nil {
+		return nil, nil, err
+	}
+	ttlIndex, _, err := b.ttlIndexer.Load(filepath.Join(b.path, ttlIndexFile), b.config.MaxKeySize)
+	if err != nil {
+		return nil, nil, err
+	}
+	if found && b.metadata.IndexUpToDate {
+		return t, ttlIndex, nil
+	}
+	if found {
+		if err := loadIndexFromDatafile(t, ttlIndex, datafiles[lastID]); err != nil {
+			return nil, ttlIndex, err
+		}
+		return t, ttlIndex, nil
+	}
+	sortedDatafiles := getSortedDatafiles(datafiles)
+	for _, df := range sortedDatafiles {
+		if err := loadIndexFromDatafile(t, ttlIndex, df); err != nil {
+			return nil, ttlIndex, err
 		}
 	}
-	return t, nil
+	return t, ttlIndex, nil
+}
+
+func loadIndexFromDatafile(t art.Tree, ttlIndex art.Tree, df data.Datafile) error {
+	var offset int64
+	for {
+		e, n, err := df.Read()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+		// Tombstone value  (deleted key)
+		if len(e.Value) == 0 {
+			t.Delete(e.Key)
+			offset += n
+			continue
+		}
+		item := internal.Item{FileID: df.FileID(), Offset: offset, Size: n}
+		t.Insert(e.Key, item)
+		if e.Expiry != nil {
+			ttlIndex.Insert(e.Key, *e.Expiry)
+		}
+		offset += n
+	}
+	return nil
+}
+
+func loadMetadata(path string) (*metadata.MetaData, error) {
+	if !internal.Exists(filepath.Join(path, "meta.json")) {
+		meta := new(metadata.MetaData)
+		return meta, nil
+	}
+	return metadata.Load(filepath.Join(path, "meta.json"))
 }
--- a/bitcask_test.go
+++ b/bitcask_test.go
@@ -6,18 +6,21 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"path"
 	"path/filepath"
 	"reflect"
 	"sort"
 	"strings"
 	"sync"
 	"testing"
+	"time"

 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"

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

 var (
@@ -68,7 +71,7 @@ func TestAll(t *testing.T) {
 	})

 	t.Run("Put", func(t *testing.T) {
-		err = db.Put([]byte([]byte("foo")), []byte("bar"))
+		err = db.Put([]byte("foo"), []byte("bar"))
 		assert.NoError(err)
 	})

@@ -82,10 +85,40 @@ func TestAll(t *testing.T) {
 		assert.Equal(1, db.Len())
 	})

+	t.Run("PutWithTTL", func(t *testing.T) {
+		err = db.PutWithTTL([]byte("bar"), []byte("baz"), 0)
+		assert.NoError(err)
+	})
+
+	t.Run("GetExpiredKey", func(t *testing.T) {
+		time.Sleep(time.Millisecond)
+		_, err := db.Get([]byte("bar"))
+		assert.Error(err)
+		assert.Equal(ErrKeyExpired, err)
+	})
+
 	t.Run("Has", func(t *testing.T) {
 		assert.True(db.Has([]byte("foo")))
 	})

+	t.Run("HasWithExpired", func(t *testing.T) {
+		err = db.PutWithTTL([]byte("bar"), []byte("baz"), 0)
+		assert.NoError(err)
+		time.Sleep(time.Millisecond)
+		assert.False(db.Has([]byte("bar")))
+	})
+
+	t.Run("RunGC", func(t *testing.T) {
+		err = db.PutWithTTL([]byte("bar"), []byte("baz"), 0)
+		assert.NoError(err)
+		time.Sleep(time.Millisecond)
+		err = db.RunGC()
+		assert.NoError(err)
+		_, err := db.Get([]byte("bar"))
+		assert.Error(err)
+		assert.Equal(ErrKeyNotFound, err)
+	})
+
 	t.Run("Keys", func(t *testing.T) {
 		keys := make([][]byte, 0)
 		for key := range db.Keys() {
@@ -127,12 +160,125 @@ func TestAll(t *testing.T) {
 		assert.NoError(err)
 	})

+	t.Run("Backup", func(t *testing.T) {
+		path, err := ioutil.TempDir("", "backup")
+		defer os.RemoveAll(path)
+		assert.NoError(err)
+		err = db.Backup(filepath.Join(path, "db-backup"))
+		assert.NoError(err)
+	})
+
 	t.Run("Close", func(t *testing.T) {
 		err = db.Close()
 		assert.NoError(err)
 	})
 }

+func TestDeleteAll(t *testing.T) {
+	assert := assert.New(t)
+	testdir, _ := ioutil.TempDir("", "bitcask")
+	db, _ := Open(testdir)
+	_ = db.Put([]byte("foo"), []byte("foo"))
+	_ = db.Put([]byte("bar"), []byte("bar"))
+	_ = db.Put([]byte("baz"), []byte("baz"))
+	assert.Equal(3, db.Len())
+	err := db.DeleteAll()
+	assert.NoError(err)
+	assert.Equal(0, db.Len())
+	_, err = db.Get([]byte("foo"))
+	assert.Equal(ErrKeyNotFound, err)
+	_, err = db.Get([]byte("bar"))
+	assert.Equal(ErrKeyNotFound, err)
+	_, err = db.Get([]byte("baz"))
+	assert.Equal(ErrKeyNotFound, err)
+}
+
+func TestReopen1(t *testing.T) {
+	assert := assert.New(t)
+	for i := 0; i < 10; i++ {
+		testdir, _ := ioutil.TempDir("", "bitcask")
+		db, _ := Open(testdir, WithMaxDatafileSize(1))
+		_ = db.Put([]byte("foo"), []byte("bar"))
+		_ = db.Put([]byte("foo"), []byte("bar1"))
+		_ = db.Put([]byte("foo"), []byte("bar2"))
+		_ = db.Put([]byte("foo"), []byte("bar3"))
+		_ = db.Put([]byte("foo"), []byte("bar4"))
+		_ = db.Put([]byte("foo"), []byte("bar5"))
+		_ = db.Reopen()
+		val, _ := db.Get([]byte("foo"))
+		assert.Equal("bar5", string(val))
+	}
+}
+
+func TestReopen(t *testing.T) {
+	assert := assert.New(t)
+
+	testdir, err := ioutil.TempDir("", "bitcask")
+	assert.NoError(err)
+
+	t.Run("Reopen", func(t *testing.T) {
+		var (
+			db  *Bitcask
+			err error
+		)
+
+		t.Run("Open", func(t *testing.T) {
+			db, err = Open(testdir)
+			assert.NoError(err)
+		})
+
+		t.Run("Put", func(t *testing.T) {
+			err = db.Put([]byte("foo"), []byte("bar"))
+			assert.NoError(err)
+		})
+
+		t.Run("PutWithTTL", func(t *testing.T) {
+			err = db.PutWithTTL([]byte("bar"), []byte("baz"), 0)
+			assert.NoError(err)
+		})
+
+		t.Run("Get", func(t *testing.T) {
+			val, err := db.Get([]byte("foo"))
+			assert.NoError(err)
+			assert.Equal([]byte("bar"), val)
+		})
+
+		t.Run("Reopen", func(t *testing.T) {
+			err = db.Reopen()
+			assert.NoError(err)
+		})
+
+		t.Run("GetAfterReopen", func(t *testing.T) {
+			val, err := db.Get([]byte("foo"))
+			assert.NoError(err)
+			assert.Equal([]byte("bar"), val)
+		})
+
+		t.Run("PutAfterReopen", func(t *testing.T) {
+			err = db.Put([]byte("zzz"), []byte("foo"))
+			assert.NoError(err)
+		})
+
+		t.Run("GetAfterReopenAndPut", func(t *testing.T) {
+			val, err := db.Get([]byte("zzz"))
+			assert.NoError(err)
+			assert.Equal([]byte("foo"), val)
+		})
+
+		t.Run("GetExpiredKeyAfterReopen", func(t *testing.T) {
+			val, err := db.Get([]byte("bar"))
+			assert.Error(err)
+			assert.Equal(ErrKeyExpired, err)
+			assert.Nil(val)
+		})
+
+		t.Run("Close", func(t *testing.T) {
+			err = db.Close()
+			assert.NoError(err)
+		})
+	})
+}
+
 func TestDeletedKeys(t *testing.T) {
 	assert := assert.New(t)

@@ -204,6 +350,64 @@ func TestDeletedKeys(t *testing.T) {
 	})
 }

+func TestMetadata(t *testing.T) {
+	assert := assert.New(t)
+	testdir, err := ioutil.TempDir("", "bitcask")
+	assert.NoError(err)
+	defer os.RemoveAll(testdir)
+
+	db, err := Open(testdir)
+	assert.NoError(err)
+	err = db.Put([]byte("foo"), []byte("bar"))
+	assert.NoError(err)
+	err = db.Close()
+	assert.NoError(err)
+	db, err = Open(testdir)
+	assert.NoError(err)
+
+	t.Run("IndexUptoDateAfterCloseAndOpen", func(t *testing.T) {
+		assert.Equal(true, db.metadata.IndexUpToDate)
+	})
+	t.Run("IndexUptoDateAfterPut", func(t *testing.T) {
+		assert.NoError(db.Put([]byte("foo1"), []byte("bar1")))
+		assert.Equal(false, db.metadata.IndexUpToDate)
+	})
+	t.Run("Reclaimable", func(t *testing.T) {
+		assert.Equal(int64(0), db.Reclaimable())
+	})
+	t.Run("ReclaimableAfterNewPut", func(t *testing.T) {
+		assert.NoError(db.Put([]byte("hello"), []byte("world")))
+		assert.Equal(int64(0), db.Reclaimable())
+	})
+	t.Run("ReclaimableAfterRepeatedPut", func(t *testing.T) {
+		assert.NoError(db.Put([]byte("hello"), []byte("world")))
+		assert.Equal(int64(34), db.Reclaimable())
+	})
+	t.Run("ReclaimableAfterDelete", func(t *testing.T) {
+		assert.NoError(db.Delete([]byte("hello")))
+		assert.Equal(int64(97), db.Reclaimable())
+	})
+	t.Run("ReclaimableAfterNonExistingDelete", func(t *testing.T) {
+		assert.NoError(db.Delete([]byte("hello1")))
+		assert.Equal(int64(97), db.Reclaimable())
+	})
+	t.Run("ReclaimableAfterDeleteAll", func(t *testing.T) {
+		assert.NoError(db.DeleteAll())
+		assert.Equal(int64(214), db.Reclaimable())
+	})
+	t.Run("ReclaimableAfterMerge", func(t *testing.T) {
+		assert.NoError(db.Merge())
+		assert.Equal(int64(0), db.Reclaimable())
+	})
+	t.Run("IndexUptoDateAfterMerge", func(t *testing.T) {
+		assert.Equal(true, db.metadata.IndexUpToDate)
+	})
+	t.Run("ReclaimableAfterMergeAndDeleteAll", func(t *testing.T) {
+		assert.NoError(db.DeleteAll())
+		assert.Equal(int64(0), db.Reclaimable())
+	})
+}
+
 func TestConfigErrors(t *testing.T) {
 	assert := assert.New(t)

@@ -234,6 +438,118 @@ func TestConfigErrors(t *testing.T) {
 	})
 }

+func TestAutoRecovery(t *testing.T) {
+	withAutoRecovery := []bool{false, true}
+
+	for _, autoRecovery := range withAutoRecovery {
+		t.Run(fmt.Sprintf("%v", autoRecovery), func(t *testing.T) {
+			require := require.New(t)
+			testdir, err := ioutil.TempDir("", "bitcask")
+			require.NoError(err)
+			db, err := Open(testdir)
+			require.NoError(err)
+
+			// Insert 10 key-value pairs and verify all is ok.
+			makeKeyVal := func(i int) ([]byte, []byte) {
+				return []byte(fmt.Sprintf("foo%d", i)), []byte(fmt.Sprintf("bar%d", i))
+			}
+			n := 10
+			for i := 0; i < n; i++ {
+				key, val := makeKeyVal(i)
+				err = db.Put(key, val)
+				require.NoError(err)
+			}
+			for i := 0; i < n; i++ {
+				key, val := makeKeyVal(i)
+				rval, err := db.Get(key)
+				require.NoError(err)
+				require.Equal(val, rval)
+			}
+			err = db.Close()
+			require.NoError(err)
+
+			// Corrupt the last inserted key
+			f, err := os.OpenFile(path.Join(testdir, "000000000.data"), os.O_RDWR, 0755)
+			require.NoError(err)
+			fi, err := f.Stat()
+			require.NoError(err)
+			err = f.Truncate(fi.Size() - 1)
+			require.NoError(err)
+			err = f.Close()
+			require.NoError(err)
+
+			db, err = Open(testdir, WithAutoRecovery(autoRecovery))
+			require.NoError(err)
+			defer db.Close()
+			// Check that all values but the last are still intact.
+			for i := 0; i < 9; i++ {
+				key, val := makeKeyVal(i)
+				rval, err := db.Get(key)
+				require.NoError(err)
+				require.Equal(val, rval)
+			}
+			// Check the index has no more keys than non-corrupted ones.
+			// i.e: all but the last one.
+			numKeys := 0
+			for range db.Keys() {
+				numKeys++
+			}
+			if !autoRecovery {
+				// We are opening without autorepair, and thus are
+				// in a corrupted state. The index isn't coherent with
+				// the datafile.
+				require.Equal(n, numKeys)
+				return
+			}
+
+			require.Equal(n-1, numKeys, "The index should have n-1 keys")
+
+			// Double-check explicitly the corrupted one isn't here.
+			// This check is redundant considering the last two checks,
+			// but doesn't hurt.
+			corrKey, _ := makeKeyVal(9)
+			_, err = db.Get(corrKey)
+			require.Equal(ErrKeyNotFound, err)
+		})
+	}
+}
+
+func TestLoadIndexes(t *testing.T) {
+	assert := assert.New(t)
+	testdir, err1 := ioutil.TempDir("", "bitcask")
+	assert.NoError(err1)
+	defer os.RemoveAll(testdir)
+
+	var db *Bitcask
+	var err error
+
+	t.Run("Setup", func(t *testing.T) {
+		db, err = Open(testdir)
+		assert.NoError(err)
+		for i := 0; i < 5; i++ {
+			key := fmt.Sprintf("key%d", i)
+			val := fmt.Sprintf("val%d", i)
+			err := db.Put([]byte(key), []byte(val))
+			assert.NoError(err)
+		}
+		for i := 0; i < 5; i++ {
+			key := fmt.Sprintf("foo%d", i)
+			val := fmt.Sprintf("bar%d", i)
+			err := db.PutWithTTL([]byte(key), []byte(val), time.Duration(i)*time.Second)
+			assert.NoError(err)
+		}
+		err = db.Close()
+		assert.NoError(err)
+	})
+
+	t.Run("OpenAgain", func(t *testing.T) {
+		db, err = Open(testdir)
+		assert.NoError(err)
+		assert.Equal(10, db.trie.Size())
+		assert.Equal(5, db.ttlIndex.Size())
+	})
+}
+
 func TestReIndex(t *testing.T) {
 	assert := assert.New(t)

@@ -256,6 +572,16 @@ func TestReIndex(t *testing.T) {
 			assert.NoError(err)
 		})

+		t.Run("PutWithExpiry", func(t *testing.T) {
+			err = db.PutWithTTL([]byte("bar"), []byte("baz"), 0)
+			assert.NoError(err)
+		})
+
+		t.Run("PutWithLargeExpiry", func(t *testing.T) {
+			err = db.PutWithTTL([]byte("bar1"), []byte("baz1"), time.Hour)
+			assert.NoError(err)
+		})
+
 		t.Run("Get", func(t *testing.T) {
 			val, err := db.Get([]byte("foo"))
 			assert.NoError(err)
@@ -275,6 +601,8 @@ func TestReIndex(t *testing.T) {
 		t.Run("DeleteIndex", func(t *testing.T) {
 			err := os.Remove(filepath.Join(testdir, "index"))
 			assert.NoError(err)
+			err = os.Remove(filepath.Join(testdir, ttlIndexFile))
+			assert.NoError(err)
 		})
 	})

@@ -295,6 +623,16 @@ func TestReIndex(t *testing.T) {
 			assert.Equal([]byte("bar"), val)
 		})

+		t.Run("GetKeyWithExpiry", func(t *testing.T) {
+			val, err := db.Get([]byte("bar"))
+			assert.Error(err)
+			assert.Equal(ErrKeyExpired, err)
+			assert.Nil(val)
+			val, err = db.Get([]byte("bar1"))
+			assert.NoError(err)
+			assert.Equal([]byte("baz1"), val)
+		})
+
 		t.Run("Close", func(t *testing.T) {
 			err = db.Close()
 			assert.NoError(err)
@@ -396,6 +734,11 @@ func TestSync(t *testing.T) {
 		value := []byte("foobar")
 		err = db.Put(key, value)
 	})
+
+	t.Run("Put", func(t *testing.T) {
+		err = db.Put([]byte("hello"), []byte("world"))
+		assert.NoError(err)
+	})
 }

 func TestMaxKeySize(t *testing.T) {
@@ -523,7 +866,9 @@ func TestStatsError(t *testing.T) {
 			assert.Equal(stats.Datafiles, 0)
 			assert.Equal(stats.Keys, 1)
 		})
+	})

+	t.Run("Test", func(t *testing.T) {
 		t.Run("FabricatedDestruction", func(t *testing.T) {
 			// This would never happen in reality :D
 			// Or would it? :)
@@ -538,6 +883,162 @@ func TestStatsError(t *testing.T) {
 	})
 }

+func TestDirFileModeBeforeUmask(t *testing.T) {
+	assert := assert.New(t)
+
+	t.Run("Setup", func(t *testing.T) {
+		t.Run("Default DirFileModeBeforeUmask is 0700", func(t *testing.T) {
+			testdir, err := ioutil.TempDir("", "bitcask")
+			embeddedDir := filepath.Join(testdir, "cache")
+			assert.NoError(err)
+			defer os.RemoveAll(testdir)
+
+			defaultTestMode := os.FileMode(0700)
+
+			db, err := Open(embeddedDir)
+			assert.NoError(err)
+			defer db.Close()
+			err = filepath.Walk(testdir, func(path string, info os.FileInfo, err error) error {
+				// skip the root directory
+				if path == testdir {
+					return nil
+				}
+				if info.IsDir() {
+					// perms for directory on disk are filtered through defaultTestMode, AND umask of user running test.
+					// this means the mkdir calls can only FURTHER restrict permissions, not grant more (preventing escalatation).
+					// to make this test OS agnostic, we'll skip using golang.org/x/sys/unix, inferring umask via XOR and AND NOT.
+
+					// create anotherDir with allPerms - to infer umask
+					anotherDir := filepath.Join(testdir, "temp")
+					err := os.Mkdir(anotherDir, os.ModePerm)
+					assert.NoError(err)
+					defer os.RemoveAll(anotherDir)
+
+					anotherStat, err := os.Stat(anotherDir)
+					assert.NoError(err)
+
+					// infer umask from anotherDir
+					umask := os.ModePerm ^ (anotherStat.Mode() & os.ModePerm)
+
+					assert.Equal(info.Mode()&os.ModePerm, defaultTestMode&^umask)
+				}
+				return nil
+			})
+			assert.NoError(err)
+		})
+
+		t.Run("Dir FileModeBeforeUmask is set via options for all subdirectories", func(t *testing.T) {
+			testdir, err := ioutil.TempDir("", "bitcask")
+			embeddedDir := filepath.Join(testdir, "cache")
+			assert.NoError(err)
+			defer os.RemoveAll(testdir)
+
+			testMode := os.FileMode(0713)
+
+			db, err := Open(embeddedDir, WithDirFileModeBeforeUmask(testMode))
+			assert.NoError(err)
+			defer db.Close()
+			err = filepath.Walk(testdir, func(path string, info os.FileInfo, err error) error {
+				// skip the root directory
+				if path == testdir {
+					return nil
+				}
+				if info.IsDir() {
+					// create anotherDir with allPerms - to infer umask
+					anotherDir := filepath.Join(testdir, "temp")
+					err := os.Mkdir(anotherDir, os.ModePerm)
+					assert.NoError(err)
+					defer os.RemoveAll(anotherDir)
+
+					anotherStat, _ := os.Stat(anotherDir)
+
+					// infer umask from anotherDir
+					umask := os.ModePerm ^ (anotherStat.Mode() & os.ModePerm)
+
+					assert.Equal(info.Mode()&os.ModePerm, testMode&^umask)
+				}
+				return nil
+			})
+			assert.NoError(err)
+		})
+
+	})
+}
+
+func TestFileFileModeBeforeUmask(t *testing.T) {
+	assert := assert.New(t)
+
+	t.Run("Setup", func(t *testing.T) {
+		t.Run("Default File FileModeBeforeUmask is 0600", func(t *testing.T) {
+			testdir, err := ioutil.TempDir("", "bitcask")
+			assert.NoError(err)
+			defer os.RemoveAll(testdir)
+
+			defaultTestMode := os.FileMode(0600)
+
+			db, err := Open(testdir)
+			assert.NoError(err)
+			defer db.Close()
+			err = filepath.Walk(testdir, func(path string, info os.FileInfo, err error) error {
+				if !info.IsDir() {
+					// the lock file is set within Flock, so ignore it
+					if filepath.Base(path) == "lock" {
+						return nil
+					}
+					// create aFile with allPerms - to infer umask
+					aFilePath := filepath.Join(testdir, "temp")
+					_, err := os.OpenFile(aFilePath, os.O_CREATE, os.ModePerm)
+					assert.NoError(err)
+					defer os.RemoveAll(aFilePath)
+
+					fileStat, _ := os.Stat(aFilePath)
+
+					// infer umask from anotherDir
+					umask := os.ModePerm ^ (fileStat.Mode() & os.ModePerm)
+
+					assert.Equal(info.Mode()&os.ModePerm, defaultTestMode&^umask)
+				}
+				return nil
+			})
+			assert.NoError(err)
+		})
+
+		t.Run("File FileModeBeforeUmask is set via options for all files", func(t *testing.T) {
+			testdir, err := ioutil.TempDir("", "bitcask")
+			assert.NoError(err)
+			defer os.RemoveAll(testdir)
+
+			testMode := os.FileMode(0673)
+
+			db, err := Open(testdir, WithFileFileModeBeforeUmask(testMode))
+			assert.NoError(err)
+			defer db.Close()
+			err = filepath.Walk(testdir, func(path string, info os.FileInfo, err error) error {
+				if !info.IsDir() {
+					// the lock file is set within Flock, so ignore it
+					if filepath.Base(path) == "lock" {
+						return nil
+					}
+					// create aFile with allPerms - to infer umask
+					aFilePath := filepath.Join(testdir, "temp")
+					_, err := os.OpenFile(aFilePath, os.O_CREATE, os.ModePerm)
+					assert.NoError(err)
+					defer os.RemoveAll(aFilePath)
+
+					fileStat, _ := os.Stat(aFilePath)
+
+					// infer umask from anotherDir
+					umask := os.ModePerm ^ (fileStat.Mode() & os.ModePerm)
+
+					assert.Equal(info.Mode()&os.ModePerm, testMode&^umask)
+				}
+				return nil
+			})
+			assert.NoError(err)
+		})
+	})
+}
+
 func TestMaxDatafileSize(t *testing.T) {
 	var (
 		db  *Bitcask
@@ -639,7 +1140,7 @@ func TestMerge(t *testing.T) {

 		s3, err := db.Stats()
 		assert.NoError(err)
-		assert.Equal(1, s3.Datafiles)
+		assert.Equal(2, s3.Datafiles)
 		assert.Equal(1, s3.Keys)
 		assert.True(s3.Size > s1.Size)
 		assert.True(s3.Size < s2.Size)
@@ -672,7 +1173,7 @@ func TestGetErrors(t *testing.T) {

 		mockDatafile := new(mocks.Datafile)
 		mockDatafile.On("FileID").Return(0)
-		mockDatafile.On("ReadAt", int64(0), int64(22)).Return(
+		mockDatafile.On("ReadAt", int64(0), int64(30)).Return(
 			internal.Entry{},
 			ErrMockError,
 		)
@@ -688,7 +1189,7 @@ func TestGetErrors(t *testing.T) {
 		assert.NoError(err)
 		defer os.RemoveAll(testdir)

-		db, err := Open(testdir, WithMaxDatafileSize(32))
+		db, err := Open(testdir, WithMaxDatafileSize(40))
 		assert.NoError(err)

 		err = db.Put([]byte("foo"), []byte("bar"))
@@ -696,7 +1197,7 @@ func TestGetErrors(t *testing.T) {

 		mockDatafile := new(mocks.Datafile)
 		mockDatafile.On("FileID").Return(0)
-		mockDatafile.On("ReadAt", int64(0), int64(22)).Return(
+		mockDatafile.On("ReadAt", int64(0), int64(30)).Return(
 			internal.Entry{
 				Checksum: 0x0,
 				Key:      []byte("foo"),
@@ -714,6 +1215,24 @@ func TestGetErrors(t *testing.T) {

 }

+func TestPutBorderCases(t *testing.T) {
+	assert := assert.New(t)
+
+	t.Run("EmptyValue", func(t *testing.T) {
+		testdir, err := ioutil.TempDir("", "bitcask")
+		assert.NoError(err)
+
+		db, err := Open(testdir)
+		assert.NoError(err)
+
+		err = db.Put([]byte("alice"), nil)
+		assert.NoError(err)
+		z, err := db.Get([]byte("alice"))
+		assert.NoError(err)
+		assert.Empty(z)
+	})
+}
+
 func TestPutErrors(t *testing.T) {
 	assert := assert.New(t)

@@ -766,6 +1285,18 @@ func TestPutErrors(t *testing.T) {
 		assert.Error(err)
 		assert.Equal(ErrMockError, err)
 	})
+
+	t.Run("EmptyKey", func(t *testing.T) {
+		testdir, err := ioutil.TempDir("", "bitcask")
+		assert.NoError(err)
+
+		db, err := Open(testdir)
+		assert.NoError(err)
+		err = db.Put(nil, []byte("hello"))
+		assert.Equal(ErrEmptyKey, err)
+
+	})
+
 }

 func TestOpenErrors(t *testing.T) {
@@ -833,7 +1364,7 @@ func TestCloseErrors(t *testing.T) {
 		assert.NoError(err)

 		mockIndexer := new(mocks.Indexer)
-		mockIndexer.On("Save", db.trie, filepath.Join(db.path, "index")).Return(ErrMockError)
+		mockIndexer.On("Save", db.trie, filepath.Join(db.path, "temp_index")).Return(ErrMockError)
 		db.indexer = mockIndexer

 		err = db.Close()
@@ -939,18 +1470,19 @@ func TestMergeErrors(t *testing.T) {
 		assert.NoError(err)
 		defer os.RemoveAll(testdir)

-		db, err := Open(testdir)
+		db, err := Open(testdir, WithMaxDatafileSize(22))
 		assert.NoError(err)

 		assert.NoError(db.Put([]byte("foo"), []byte("bar")))
+		assert.NoError(db.Put([]byte("bar"), []byte("baz")))

 		mockDatafile := new(mocks.Datafile)
-		mockDatafile.On("FileID").Return(0)
-		mockDatafile.On("ReadAt", int64(0), int64(22)).Return(
+		mockDatafile.On("Close").Return(nil)
+		mockDatafile.On("ReadAt", int64(0), int64(30)).Return(
 			internal.Entry{},
 			ErrMockError,
 		)
-		db.curr = mockDatafile
+		db.datafiles[0] = mockDatafile

 		err = db.Merge()
 		assert.Error(err)
@@ -999,11 +1531,11 @@ func TestConcurrent(t *testing.T) {
 			}

 			wg := &sync.WaitGroup{}
+			wg.Add(3)

 			go f(wg, 2)
 			go f(wg, 3)
 			go f(wg, 5)
-			wg.Add(3)

 			wg.Wait()
 		})
@@ -1021,15 +1553,100 @@ func TestConcurrent(t *testing.T) {
 			}

 			wg := &sync.WaitGroup{}
-
-			go f(wg, 100)
-			go f(wg, 100)
-			go f(wg, 100)
 			wg.Add(3)
+			go f(wg, 100)
+			go f(wg, 100)
+			go f(wg, 100)

 			wg.Wait()
 		})

+		// Test concurrent Put() with concurrent Scan()
+		t.Run("PutScan", func(t *testing.T) {
+			doPut := func(wg *sync.WaitGroup, x int) {
+				defer func() {
+					wg.Done()
+				}()
+				for i := 0; i <= 100; i++ {
+					if i%x == 0 {
+						key := []byte(fmt.Sprintf("k%d", i))
+						value := []byte(fmt.Sprintf("v%d", i))
+						err := db.Put(key, value)
+						assert.NoError(err)
+					}
+				}
+			}
+
+			doScan := func(wg *sync.WaitGroup, x int) {
+				defer func() {
+					wg.Done()
+				}()
+				for i := 0; i <= 100; i++ {
+					if i%x == 0 {
+						err := db.Scan([]byte("k"), func(key []byte) error {
+							return nil
+						})
+						assert.NoError(err)
+					}
+				}
+			}
+
+			wg := &sync.WaitGroup{}
+			wg.Add(6)
+
+			go doPut(wg, 2)
+			go doPut(wg, 3)
+			go doPut(wg, 5)
+			go doScan(wg, 1)
+			go doScan(wg, 2)
+			go doScan(wg, 4)
+
+			wg.Wait()
+		})
+
+		// XXX: This has data races
+		/* Test concurrent Scan() with concurrent Merge()
+		t.Run("ScanMerge", func(t *testing.T) {
+			doScan := func(wg *sync.WaitGroup, x int) {
+				defer func() {
+					wg.Done()
+				}()
+				for i := 0; i <= 100; i++ {
+					if i%x == 0 {
+						err := db.Scan([]byte("k"), func(key []byte) error {
+							return nil
+						})
+						assert.NoError(err)
+					}
+				}
+			}
+
+			doMerge := func(wg *sync.WaitGroup, x int) {
+				defer func() {
+					wg.Done()
+				}()
+				for i := 0; i <= 100; i++ {
+					if i%x == 0 {
+						err := db.Merge()
+						assert.NoError(err)
+					}
+				}
+			}
+
+			wg := &sync.WaitGroup{}
+			wg.Add(6)
+
+			go doScan(wg, 2)
+			go doScan(wg, 3)
+			go doScan(wg, 5)
+			go doMerge(wg, 1)
+			go doMerge(wg, 2)
+			go doMerge(wg, 4)
+
+			wg.Wait()
+		})
+		*/
+
 		t.Run("Close", func(t *testing.T) {
 			err = db.Close()
 			assert.NoError(err)
@@ -1109,7 +1726,27 @@ func TestLocking(t *testing.T) {

 	_, err = Open(testdir)
 	assert.Error(err)
-	assert.Equal(ErrDatabaseLocked, err)
+}
+
+func TestLockingAfterMerge(t *testing.T) {
+	assert := assert.New(t)
+
+	testdir, err := ioutil.TempDir("", "bitcask")
+	assert.NoError(err)
+
+	db, err := Open(testdir)
+	assert.NoError(err)
+	defer db.Close()
+
+	_, err = Open(testdir)
+	assert.Error(err)
+
+	err = db.Merge()
+	assert.NoError(err)
+
+	// This should still error.
+	_, err = Open(testdir)
+	assert.Error(err)
 }

 type benchmarkTestCase struct {
--- 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{
--- a/cmd/bitcask/export.go
+++ b/cmd/bitcask/export.go
@@ -11,7 +11,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

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

 var errNotAllDataWritten = errors.New("error: not all data written")
--- 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{
--- a/cmd/bitcask/import.go
+++ b/cmd/bitcask/import.go
@@ -11,7 +11,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

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

 var importCmd = &cobra.Command{
--- a/cmd/bitcask/initdb.go
+++ b/cmd/bitcask/initdb.go
@@ -7,7 +7,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

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

 var initdbCmd = &cobra.Command{
--- 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{
--- 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{
--- a/cmd/bitcask/put.go
+++ b/cmd/bitcask/put.go
@@ -10,7 +10,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

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

 var putCmd = &cobra.Command{
--- a/cmd/bitcask/recover.go
+++ b/cmd/bitcask/recover.go
@@ -6,11 +6,11 @@ import (
 	"os"
 	"path/filepath"

-	"github.com/prologic/bitcask"
-	"github.com/prologic/bitcask/internal"
-	"github.com/prologic/bitcask/internal/config"
-	"github.com/prologic/bitcask/internal/data/codec"
-	"github.com/prologic/bitcask/internal/index"
+	"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"
--- a/cmd/bitcask/root.go
+++ b/cmd/bitcask/root.go
@@ -8,7 +8,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

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

 // RootCmd represents the base command when called without any subcommands
--- a/cmd/bitcask/scan.go
+++ b/cmd/bitcask/scan.go
@@ -8,7 +8,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

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

 var scanCmd = &cobra.Command{
--- a/cmd/bitcask/stats.go
+++ b/cmd/bitcask/stats.go
@@ -9,7 +9,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"

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

 var statsCmd = &cobra.Command{
--- a/cmd/bitcaskd/main.go
+++ b/cmd/bitcaskd/main.go
@@ -7,7 +7,7 @@ import (
 	log "github.com/sirupsen/logrus"
 	flag "github.com/spf13/pflag"

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

 var (
@@ -55,5 +55,7 @@ func main() {
 		os.Exit(2)
 	}

-	log.Fatal(server.Run())
+	if err = server.Run(); err != nil {
+		log.Fatal(err)
+	}
 }
--- a/cmd/bitcaskd/server.go
+++ b/cmd/bitcaskd/server.go
@@ -1,13 +1,18 @@
 package main

 import (
+	"encoding/binary"
 	"fmt"
+	"os"
+	"os/signal"
 	"strings"
+	"syscall"
+	"time"

 	log "github.com/sirupsen/logrus"
 	"github.com/tidwall/redcon"

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

 type server struct {
@@ -29,17 +34,44 @@ func newServer(bind, dbpath string) (*server, error) {
 }

 func (s *server) handleSet(cmd redcon.Command, conn redcon.Conn) {
-	if len(cmd.Args) != 3 {
+	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 err := s.db.Put(key, value); err != nil {
-		conn.WriteString(fmt.Sprintf("ERR: %s", err))
-	} else {
-		conn.WriteString("OK")
+
+	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
 	}
+
+	err := s.db.Lock()
+	if err != nil {
+		conn.WriteError("ERR " + fmt.Errorf("failed to lock db: %v", err).Error() + "")
+		return
+	}
+	defer s.db.Unlock()
+
+	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) {
@@ -47,7 +79,16 @@ func (s *server) handleGet(cmd redcon.Command, conn redcon.Conn) {
 		conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
 		return
 	}
+
 	key := cmd.Args[1]
+
+	err := s.db.Lock()
+	if err != nil {
+		conn.WriteError("ERR " + fmt.Errorf("failed to lock db: %v", err).Error() + "")
+		return
+	}
+	defer s.db.Unlock()
+
 	value, err := s.db.Get(key)
 	if err != nil {
 		conn.WriteNull()
@@ -57,9 +98,16 @@ func (s *server) handleGet(cmd redcon.Command, conn redcon.Conn) {
 }

 func (s *server) handleKeys(cmd redcon.Command, conn redcon.Conn) {
+	err := s.db.Lock()
+	if err != nil {
+		conn.WriteError("ERR " + fmt.Errorf("failed to lock db: %v", err).Error() + "")
+		return
+	}
+	defer s.db.Unlock()
+
 	conn.WriteArray(s.db.Len())
 	for key := range s.db.Keys() {
-		conn.WriteBulk([]byte(key))
+		conn.WriteBulk(key)
 	}
 }

@@ -68,7 +116,16 @@ func (s *server) handleExists(cmd redcon.Command, conn redcon.Conn) {
 		conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
 		return
 	}
+
 	key := cmd.Args[1]
+
+	err := s.db.Lock()
+	if err != nil {
+		conn.WriteError("ERR " + fmt.Errorf("failed to lock db: %v", err).Error() + "")
+		return
+	}
+	defer s.db.Unlock()
+
 	if s.db.Has(key) {
 		conn.WriteInt(1)
 	} else {
@@ -81,7 +138,16 @@ func (s *server) handleDel(cmd redcon.Command, conn redcon.Conn) {
 		conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
 		return
 	}
+
 	key := cmd.Args[1]
+
+	err := s.db.Lock()
+	if err != nil {
+		conn.WriteError("ERR " + fmt.Errorf("failed to lock db: %v", err).Error() + "")
+		return
+	}
+	defer s.db.Unlock()
+
 	if err := s.db.Delete(key); err != nil {
 		conn.WriteInt(0)
 	} else {
@@ -89,8 +155,13 @@ func (s *server) handleDel(cmd redcon.Command, conn redcon.Conn) {
 	}
 }

+func (s *server) Shutdown() (err error) {
+	err = s.db.Close()
+	return
+}
+
 func (s *server) Run() (err error) {
-	err = redcon.ListenAndServe(s.bind,
+	redServer := redcon.NewServerNetwork("tcp", s.bind,
 		func(conn redcon.Conn, cmd redcon.Command) {
 			switch strings.ToLower(string(cmd.Args[0])) {
 			case "ping":
@@ -118,5 +189,17 @@ func (s *server) Run() (err error) {
 		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/flock/flock.go
+++ b/flock/flock.go
@@ -0,0 +1,97 @@
+package flock
+
+import (
+	"errors"
+	"os"
+	"sync"
+)
+
+type Flock struct {
+	path string
+	m    sync.Mutex
+	fh   *os.File
+}
+
+var (
+	ErrAlreadyLocked = errors.New("Double lock: already own the lock")
+	ErrLockFailed    = errors.New("Could not acquire lock")
+	ErrLockNotHeld   = errors.New("Could not unlock, lock is not held")
+
+	ErrInodeChangedAtPath = errors.New("Inode changed at path")
+)
+
+// New returns a new instance of *Flock. The only parameter
+// it takes is the path to the desired lockfile.
+func New(path string) *Flock {
+	return &Flock{path: path}
+}
+
+// Path returns the file path linked to this lock.
+func (f *Flock) Path() string {
+	return f.path
+}
+
+// Lock will acquire the lock. This function may block indefinitely if some other process holds the lock. For a non-blocking version, see Flock.TryLock().
+func (f *Flock) Lock() error {
+	f.m.Lock()
+	defer f.m.Unlock()
+
+	if f.fh != nil {
+		return ErrAlreadyLocked
+	}
+
+	var fh *os.File
+
+	fh, err := lock_sys(f.path, false)
+	// treat "ErrInodeChangedAtPath" as "some other process holds the lock, retry locking"
+	for err == ErrInodeChangedAtPath {
+		fh, err = lock_sys(f.path, false)
+	}
+
+	if err != nil {
+		return err
+	}
+	if fh == nil {
+		return ErrLockFailed
+	}
+
+	f.fh = fh
+	return nil
+}
+
+// TryLock will try to acquire the lock, and returns immediately if the lock is already owned by another process.
+func (f *Flock) TryLock() (bool, error) {
+	f.m.Lock()
+	defer f.m.Unlock()
+
+	if f.fh != nil {
+		return false, ErrAlreadyLocked
+	}
+
+	fh, err := lock_sys(f.path, true)
+	if err != nil {
+		return false, ErrLockFailed
+	}
+
+	f.fh = fh
+	return true, nil
+}
+
+// Unlock removes the lock file from disk and releases the lock.
+// Whatever the result of `.Unlock()`, the caller must assume that it does not hold the lock anymore.
+func (f *Flock) Unlock() error {
+	f.m.Lock()
+	defer f.m.Unlock()
+
+	if f.fh == nil {
+		return ErrLockNotHeld
+	}
+
+	err1 := rm_if_match(f.fh, f.path)
+	err2 := f.fh.Close()
+
+	if err1 != nil {
+		return err1
+	}
+	return err2
+}
--- a/flock/flock_test.go
+++ b/flock/flock_test.go
@@ -0,0 +1,121 @@
+package flock
+
+import (
+	"os"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// WARNING : this test will delete the file located at "testLockPath". Choose an adequate temporary file name.
+const testLockPath = "/tmp/bitcask_unit_test_lock" // file path to use for the lock
+
+func TestTryLock(t *testing.T) {
+	// test that basic locking functionalities are consistent
+
+	// make sure there is no present lock when starting this test
+	os.Remove(testLockPath)
+
+	assert := assert.New(t)
+
+	lock1 := New(testLockPath)
+	lock2 := New(testLockPath)
+
+	// 1- take the first lock
+	locked1, err := lock1.TryLock()
+	assert.True(locked1)
+	assert.NoError(err)
+
+	// 2- check that the second lock cannot acquire the lock
+	locked2, err := lock2.TryLock()
+	assert.False(locked2)
+	assert.Error(err)
+
+	// 3- release the first lock
+	err = lock1.Unlock()
+	assert.NoError(err)
+
+	// 4- check that the second lock can acquire and then release the lock without error
+	locked2, err = lock2.TryLock()
+	assert.True(locked2)
+	assert.NoError(err)
+
+	err = lock2.Unlock()
+	assert.NoError(err)
+}
+
+func TestLock(t *testing.T) {
+	assert := assert.New(t)
+
+	// make sure there is no present lock when starting this test
+	os.Remove(testLockPath)
+
+	syncChan := make(chan bool)
+
+	// main goroutine: take lock on testPath
+	lock := New(testLockPath)
+
+	err := lock.Lock()
+	assert.NoError(err)
+
+	go func() {
+		// sub routine:
+		lock := New(testLockPath)
+
+		// before entering the block '.Lock()' call, signal we are about to do it
+		// see below : the main goroutine will wait for a small delay before releasing the lock
+		syncChan <- true
+		// '.Lock()' should ultimately return without error :
+		err := lock.Lock()
+		assert.NoError(err)
+
+		err = lock.Unlock()
+		assert.NoError(err)
+
+		close(syncChan)
+	}()
+
+	// wait for the "ready" signal from the sub routine,
+	<-syncChan
+
+	// after that signal wait for a small delay before releasing the lock
+	<-time.After(100 * time.Microsecond)
+	err = lock.Unlock()
+	assert.NoError(err)
+
+	// wait for the sub routine to finish
+	<-syncChan
+}
+
+func TestErrorConditions(t *testing.T) {
+	// error conditions implemented in this version :
+	// - you can't release a lock you do not hold
+	// - you can't lock twice the same lock
+
+	// -- setup
+	assert := assert.New(t)
+
+	// make sure there is no present lock when starting this test
+	os.Remove(testLockPath)
+
+	lock := New(testLockPath)
+
+	// -- run tests :
+
+	err := lock.Unlock()
+	assert.Error(err, "you can't release a lock you do not hold")
+
+	// take the lock once:
+	lock.TryLock()
+
+	locked, err := lock.TryLock()
+	assert.False(locked)
+	assert.Error(err, "you can't lock twice the same lock (using .TryLock())")
+
+	err = lock.Lock()
+	assert.Error(err, "you can't lock twice the same lock (using .Lock())")
+
+	// -- teardown
+	lock.Unlock()
+}
--- a/flock/flock_unix.go
+++ b/flock/flock_unix.go
@@ -0,0 +1,79 @@
+// +build !aix,!windows
+
+package flock
+
+import (
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+func lock_sys(path string, nonBlocking bool) (_ *os.File, err error) {
+	var fh *os.File
+
+	fh, err = os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0666)
+	if err != nil {
+		return nil, err
+	}
+
+	defer func() {
+		if err != nil {
+			fh.Close()
+		}
+	}()
+
+	flag := unix.LOCK_EX
+	if nonBlocking {
+		flag |= unix.LOCK_NB
+	}
+
+	err = unix.Flock(int(fh.Fd()), flag)
+	if err != nil {
+		return nil, err
+	}
+
+	if !sameInodes(fh, path) {
+		return nil, ErrInodeChangedAtPath
+	}
+
+	return fh, nil
+}
+
+func rm_if_match(fh *os.File, path string) error {
+	// Sanity check :
+	// before running "rm", check that the file pointed at by the
+	// filehandle has the same inode as the path in the filesystem
+	//
+	// If this sanity check doesn't pass, store a "ErrInodeChangedAtPath" error,
+	// if the check passes, run os.Remove, and store the error if any.
+	//
+	// note : this sanity check is in no way atomic, but :
+	//   - as long as only cooperative processes are involved, it will work as intended
+	//   - it allows to avoid 99.9% the major pitfall case: "root user forcefully removed the lockfile"
+
+	if !sameInodes(fh, path) {
+		return ErrInodeChangedAtPath
+	}
+
+	return os.Remove(path)
+}
+
+func sameInodes(f *os.File, path string) bool {
+	// get inode from opened file f:
+	var fstat unix.Stat_t
+	err := unix.Fstat(int(f.Fd()), &fstat)
+	if err != nil {
+		return false
+	}
+	fileIno := fstat.Ino
+
+	// get inode for path on disk:
+	var dstat unix.Stat_t
+	err = unix.Stat(path, &dstat)
+	if err != nil {
+		return false
+	}
+	pathIno := dstat.Ino
+
+	return pathIno == fileIno
+}
--- a/flock/race_test.go
+++ b/flock/race_test.go
@@ -0,0 +1,236 @@
+package flock
+
+// the "nd" in "nd_test.go" stands for non-deterministic
+
+import (
+	"errors"
+	"os"
+	"sync"
+	"sync/atomic"
+	"syscall"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// The two tests in this file are test some concurrency scenarios :
+// 1- TestRaceLock() runs several threads racing for the same lock
+// 2- TestShatteredLock() runs racing racing threads, along with another threads which forcibly remove the file from disk
+//
+// Note that these tests are non-deterministic : the coverage produced by each test depends
+// on how the runtime chooses to schedule the concurrent goroutines.
+
+var lockerCount int64
+
+// lockAndCount tries to take a lock on "lockpath"
+// if it fails : it returns 0 and stop there
+// if it succeeds :
+//   1- it sets a defer function to release the lock in the same fashion as "func (b *Bitcask) Close()"
+//   2- it increments the shared "lockerCount" above
+//   3- it waits for a short amount of time
+//   4- it decrements "lockerCount"
+//   5- it returns the value it has seen at step 2.
+//
+// If the locking and unlocking behave as we expect them to,
+// instructions 1-5 should be in a critical section,
+// and the only possible value at step 2 should be "1".
+//
+// Returning a value > 0 indicates this function successfully acquired the lock,
+// returning a value == 0 indicates that TryLock failed.
+
+func lockAndCount(lockpath string) int64 {
+	lock := New(lockpath)
+	ok, _ := lock.TryLock()
+	if !ok {
+		return 0
+	}
+	defer func() {
+		lock.Unlock()
+	}()
+
+	x := atomic.AddInt64(&lockerCount, 1)
+	// emulate a workload :
+	<-time.After(1 * time.Microsecond)
+	atomic.AddInt64(&lockerCount, -1)
+
+	return x
+}
+
+// locker will call the lock function above in a loop, until one of the following holds :
+//  - reading from the "timeout" channel doesn't block
+//  - the number of calls to "lock()" that indicate the lock was successfully taken reaches "successfullLockCount"
+func locker(t *testing.T, id int, lockPath string, successfulLockCount int, timeout <-chan struct{}) {
+	timedOut := false
+
+	failCount := 0
+	max := int64(0)
+
+lockloop:
+	for successfulLockCount > 0 {
+		select {
+		case <-timeout:
+			timedOut = true
+			break lockloop
+		default:
+		}
+
+		x := lockAndCount(lockPath)
+
+		if x > 0 {
+			// if x indicates the lock was taken : decrement the counter
+			successfulLockCount--
+		}
+
+		if x > 1 {
+			// if x indicates an invalid value : increase the failCount and update max accordingly
+			failCount++
+			if x > max {
+				max = x
+			}
+		}
+	}
+
+	// check failure cases :
+	if timedOut {
+		t.Fail()
+		t.Logf("[runner %02d] timed out", id)
+	}
+	if failCount > 0 {
+		t.Fail()
+		t.Logf("[runner %02d] lockCounter was > 1 on %2.d occasions, max seen value was %2.d", id, failCount, max)
+	}
+}
+
+// TestRaceLock checks that no error occurs when several concurrent actors (goroutines in this case) race for the same lock.
+func TestRaceLock(t *testing.T) {
+	// test parameters, written in code :
+	//   you may want to tweak these values for testing
+
+	goroutines := 20          // number of concurrent "locker" goroutines to launch
+	successfulLockCount := 50 // how many times a "locker" will successfully take the lock before halting
+
+	// make sure there is no present lock when startng this test
+	os.Remove(testLockPath)
+
+	// timeout implemented in code
+	// (the lock acquisition depends on the behavior of the filesystem,
+	//	avoid sending CI in endless loop if something fishy happens on the test server ...)
+	// tweak this value if needed ; comment out the "close(ch)" instruction below
+	timeout := 10 * time.Second
+	ch := make(chan struct{})
+	go func() {
+		<-time.After(timeout)
+		close(ch)
+	}()
+
+	wg := &sync.WaitGroup{}
+	wg.Add(goroutines)
+
+	for i := 0; i < goroutines; i++ {
+		go func(id int) {
+			locker(t, id, testLockPath, successfulLockCount, ch)
+			wg.Done()
+		}(i)
+	}
+
+	wg.Wait()
+}
+
+func isExpectedError(err error) bool {
+	switch {
+	case err == nil:
+		return true
+	case err == ErrInodeChangedAtPath:
+		return true
+	case errors.Is(err, syscall.ENOENT):
+		return true
+
+	default:
+		return false
+	}
+}
+
+// TestShatteredLock runs concurrent goroutines on one lock, with an extra goroutine
+// which removes the lock file from disk without checking the locks
+// (e.g: a user who would run 'rm lockfile' in a loop while the program is running).
+//
+// In this scenario, errors may occur on .Unlock() ; this test checks that only errors
+// relating to the file being deleted occur.
+//
+// This test additionally logs the number of errors that occurred, grouped by error message.
+func TestShatteredLock(t *testing.T) {
+	// test parameters, written in code :
+	//   you may want to tweak these values for testing
+
+	goroutines := 4           // number of concurrent "locker" and "remover" goroutines to launch
+	successfulLockCount := 10 // how many times a "locker" will successfully take the lock before halting
+
+	// make sure there is no present lock when startng this test
+	os.Remove(testLockPath)
+	assert := assert.New(t)
+
+	wg := &sync.WaitGroup{}
+	wg.Add(goroutines)
+
+	stopChan := make(chan struct{})
+
+	errChan := make(chan error, 10)
+
+	for i := 0; i < goroutines; i++ {
+		go func(id int, count int) {
+			for count > 0 {
+				lock := New(testLockPath)
+				ok, _ := lock.TryLock()
+				if !ok {
+					continue
+				}
+
+				count--
+				err := lock.Unlock()
+				if !isExpectedError(err) {
+					assert.Fail("goroutine %d - unexpected error: %v", id, err)
+				}
+
+				if err != nil {
+					errChan <- err
+				}
+			}
+
+			wg.Done()
+		}(i, successfulLockCount)
+	}
+
+	var wgCompanion = &sync.WaitGroup{}
+	wgCompanion.Add(2)
+
+	go func() {
+		defer wgCompanion.Done()
+		for {
+			os.Remove(testLockPath)
+
+			select {
+			case <-stopChan:
+				return
+			default:
+			}
+		}
+	}()
+
+	var errs = make(map[string]int)
+	go func() {
+		for err := range errChan {
+			errs[err.Error()]++
+		}
+		wgCompanion.Done()
+	}()
+
+	wg.Wait()
+	close(stopChan)
+	close(errChan)
+	wgCompanion.Wait()
+
+	for err, count := range errs {
+		t.Logf("  seen %d times: %s", count, err)
+	}
+}
--- a/go.mod
+++ b/go.mod
@@ -1,23 +1,17 @@
-module github.com/prologic/bitcask
+module git.mills.io/prologic/bitcask

 go 1.13

 require (
-	github.com/gofrs/flock v0.7.1
-	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
-	github.com/magiconair/properties v1.8.1 // indirect
-	github.com/pelletier/go-toml v1.4.0 // indirect
-	github.com/pkg/errors v0.8.1
-	github.com/plar/go-adaptive-radix-tree v1.0.1
-	github.com/sirupsen/logrus v1.4.2
-	github.com/spf13/afero v1.2.2 // indirect
-	github.com/spf13/cobra v0.0.5
-	github.com/spf13/jwalterweatherman v1.1.0 // indirect
-	github.com/spf13/pflag v1.0.3
-	github.com/spf13/viper v1.4.0
-	github.com/stretchr/testify v1.3.0
-	github.com/tidwall/redcon v1.0.0
-	golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56
-	golang.org/x/sys v0.0.0-20190804053845-51ab0e2deafa // indirect
-	golang.org/x/text v0.3.2 // indirect
+	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
+	golang.org/x/sys v0.0.0-20210510120138-977fb7262007
 )
--- a/go.sum
+++ b/go.sum
@@ -1,191 +1,686 @@
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+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/ini.v1 v1.62.0 h1:duBzk771uxoUuOlyRLkHsygud9+5lrlGjdFBb4mSKDU=
+gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -8,10 +8,14 @@ import (

 // 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"`
+	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
@@ -32,23 +36,16 @@ func Load(path string) (*Config, error) {

 // Save saves the configuration to the provided path
 func (c *Config) Save(path string) error {
-	f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
-	if err != nil {
-		return err
-	}

 	data, err := json.Marshal(c)
 	if err != nil {
 		return err
 	}

-	if _, err = f.Write(data); err != nil {
+	err = ioutil.WriteFile(path, data, c.FileFileModeBeforeUmask)
+	if err != nil {
 		return err
 	}

-	if err = f.Sync(); err != nil {
-		return err
-	}
-
-	return f.Close()
+	return nil
 }
--- a/internal/data/codec/decoder.go
+++ b/internal/data/codec/decoder.go
@@ -3,9 +3,10 @@ package codec
 import (
 	"encoding/binary"
 	"io"
+	"time"

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

 var (
@@ -49,13 +50,13 @@ func (d *Decoder) Decode(v *internal.Entry) (int64, error) {
 		return 0, err
 	}

-	buf := make([]byte, uint64(actualKeySize)+actualValueSize+checksumSize)
+	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), nil
+	return int64(keySize + valueSize + uint64(actualKeySize) + actualValueSize + checksumSize + ttlSize), nil
 }

 // DecodeEntry decodes a serialized entry
@@ -74,7 +75,7 @@ func getKeyValueSizes(buf []byte, maxKeySize uint32, maxValueSize uint64) (uint3
 	actualKeySize := binary.BigEndian.Uint32(buf[:keySize])
 	actualValueSize := binary.BigEndian.Uint64(buf[keySize:])

-	if actualKeySize > maxKeySize || actualValueSize > maxValueSize || actualKeySize == 0 {
+	if (maxKeySize > 0 && actualKeySize > maxKeySize) || (maxValueSize > 0 && actualValueSize > maxValueSize) || actualKeySize == 0 {

 		return 0, 0, errInvalidKeyOrValueSize
 	}
@@ -84,8 +85,18 @@ func getKeyValueSizes(buf []byte, maxKeySize uint32, maxValueSize uint64) (uint3

 func decodeWithoutPrefix(buf []byte, valueOffset uint32, v *internal.Entry) {
 	v.Key = buf[:valueOffset]
-	v.Value = buf[valueOffset : len(buf)-checksumSize]
-	v.Checksum = binary.BigEndian.Uint32(buf[len(buf)-checksumSize:])
+	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
--- a/internal/data/codec/decoder_test.go
+++ b/internal/data/codec/decoder_test.go
@@ -5,8 +5,9 @@ import (
 	"encoding/binary"
 	"io"
 	"testing"
+	"time"

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

@@ -107,3 +108,23 @@ func TestTruncatedData(t *testing.T) {
 		})
 	}
 }
+
+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
@@ -6,13 +6,15 @@ import (
 	"io"

 	"github.com/pkg/errors"
-	"github.com/prologic/bitcask/internal"
+	"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.
@@ -49,9 +51,19 @@ func (e *Encoder) Encode(msg internal.Entry) (int64, error) {
 		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), nil
+	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
@@ -4,8 +4,9 @@ import (
 	"bytes"
 	"encoding/hex"
 	"testing"
+	"time"

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

@@ -14,15 +15,17 @@ func TestEncode(t *testing.T) {
 	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 := "0000000500000000000000076d796b65796d7976616c7565000651bd"
+	expectedHex := "0000000500000000000000076d796b65796d7976616c7565000651bd000000005f751c00"
 	if assert.NoError(err) {
 		assert.Equal(expectedHex, hex.EncodeToString(buf.Bytes()))
 	}
--- a/internal/data/datafile.go
+++ b/internal/data/datafile.go
@@ -7,8 +7,8 @@ import (
 	"sync"

 	"github.com/pkg/errors"
-	"github.com/prologic/bitcask/internal"
-	"github.com/prologic/bitcask/internal/data/codec"
+	"git.mills.io/prologic/bitcask/internal"
+	"git.mills.io/prologic/bitcask/internal/data/codec"
 	"golang.org/x/exp/mmap"
 )

@@ -19,8 +19,6 @@ const (
 var (
 	errReadonly  = errors.New("error: read only datafile")
 	errReadError = errors.New("error: read error")
-
-	mxMemPool sync.RWMutex
 )

 // Datafile is an interface  that represents a readable and writeable datafile
@@ -50,7 +48,7 @@ type datafile struct {
 }

 // NewDatafile opens an existing datafile
-func NewDatafile(path string, id int, readonly bool, maxKeySize uint32, maxValueSize uint64) (Datafile, error) {
+func NewDatafile(path string, id int, readonly bool, maxKeySize uint32, maxValueSize uint64, fileMode os.FileMode) (Datafile, error) {
 	var (
 		r   *os.File
 		ra  *mmap.ReaderAt
@@ -61,7 +59,7 @@ func NewDatafile(path string, id int, readonly bool, maxKeySize uint32, maxValue
 	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)
+		w, err = os.OpenFile(fn, os.O_WRONLY|os.O_APPEND|os.O_CREATE, fileMode)
 		if err != nil {
 			return nil, err
 		}
--- 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("recovering data file")
+	}
+	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
+		}
+	}()
+	_, file := filepath.Split(path)
+	rPath := 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
@@ -2,6 +2,7 @@ package internal

 import (
 	"hash/crc32"
+	"time"
 )

 // Entry represents a key/value in the database
@@ -10,15 +11,17 @@ type Entry struct {
 	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) Entry {
+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
@@ -6,7 +6,7 @@ import (

 	"github.com/pkg/errors"
 	art "github.com/plar/go-adaptive-radix-tree"
-	"github.com/prologic/bitcask/internal"
+	"git.mills.io/prologic/bitcask/internal"
 )

 var (
@@ -34,7 +34,7 @@ func readKeyBytes(r io.Reader, maxKeySize uint32) ([]byte, error) {
 		return nil, errors.Wrap(errTruncatedKeySize, err.Error())
 	}
 	size := binary.BigEndian.Uint32(s)
-	if size > uint32(maxKeySize) {
+	if maxKeySize > 0 && size > uint32(maxKeySize) {
 		return nil, errKeySizeTooLarge
 	}

@@ -117,11 +117,7 @@ func writeIndex(t art.Tree, w io.Writer) (err error) {

 		item := node.Value().(internal.Item)
 		err := writeItem(item, w)
-		if err != nil {
-			return false
-		}
-
-		return true
+		return err == nil
 	})
 	return
 }
--- a/internal/index/codec_index_test.go
+++ b/internal/index/codec_index_test.go
@@ -8,7 +8,7 @@ import (

 	"github.com/pkg/errors"
 	art "github.com/plar/go-adaptive-radix-tree"
-	"github.com/prologic/bitcask/internal"
+	"git.mills.io/prologic/bitcask/internal"
 )

 const (
--- a/internal/index/index.go
+++ b/internal/index/index.go
@@ -4,7 +4,7 @@ import (
 	"os"

 	art "github.com/plar/go-adaptive-radix-tree"
-	"github.com/prologic/bitcask/internal"
+	"git.mills.io/prologic/bitcask/internal"
 )

 // Indexer is an interface for loading and saving the index (an Adaptive Radix Tree)
--- 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/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
@@ -2,7 +2,7 @@

 package mocks

-import internal "github.com/prologic/bitcask/internal"
+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
--- a/internal/utils.go
+++ b/internal/utils.go
@@ -1,7 +1,9 @@
 package internal

 import (
+	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sort"
@@ -33,7 +35,8 @@ func DirSize(path string) (int64, error) {

 // 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 an monotomic increasing integer.
+// 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 {
@@ -62,3 +65,48 @@ func ParseIds(fns []string) ([]int, error) {
 	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/options.go
+++ b/options.go
@@ -1,8 +1,18 @@
 package bitcask

-import "github.com/prologic/bitcask/internal/config"
+import (
+	"os"
+
+	"git.mills.io/prologic/bitcask/internal/config"
+)

 const (
+	// DefaultDirFileModeBeforeUmask is the default os.FileMode used when creating directories
+	DefaultDirFileModeBeforeUmask = os.FileMode(0700)
+
+	// DefaultFileFileModeBeforeUmask is the default os.FileMode used when creating files
+	DefaultFileFileModeBeforeUmask = os.FileMode(0600)
+
 	// DefaultMaxDatafileSize is the default maximum datafile size in bytes
 	DefaultMaxDatafileSize = 1 << 20 // 1MB

@@ -14,11 +24,54 @@ const (

 	// 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
+	}
+}
+
+// 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
+	}
+}
+
+// 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 {
@@ -54,9 +107,12 @@ func WithSync(sync bool) Option {

 func newDefaultConfig() *config.Config {
 	return &config.Config{
-		MaxDatafileSize: DefaultMaxDatafileSize,
-		MaxKeySize:      DefaultMaxKeySize,
-		MaxValueSize:    DefaultMaxValueSize,
-		Sync:            DefaultSync,
+		MaxDatafileSize:         DefaultMaxDatafileSize,
+		MaxKeySize:              DefaultMaxKeySize,
+		MaxValueSize:            DefaultMaxValueSize,
+		Sync:                    DefaultSync,
+		DirFileModeBeforeUmask:  DefaultDirFileModeBeforeUmask,
+		FileFileModeBeforeUmask: DefaultFileFileModeBeforeUmask,
+		DBVersion:               CurrentDBVersion,
 	}
 }
--- 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/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-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 --tags
-goreleaser release --rm-dist
+goreleaser release \
+  --rm-dist \
+  --release-notes <(git-chglog "${TAG}" | tail -n+5)