bitcask
A high performance Key/Value store written in Go with a predictable read/write performance and high throughput. Uses a Bitcask on-disk layout (LSM+WAL) similar to Riak. 🗃️
For a more feature-complete Redis-compatible server, distributed key/value store have a look at Bitraft which uses this library as its backend. Use Bitcask as a starting point or if you want to embed in your application, use Bitraft if you need a complete server/client solution with high availability with a Redis-compatible API.
Features
- Embeddable (
import "github.com/prologic/bitcask") - Builtin CLI (
bitcask) - Builtin Redis-compatible server (
bitcaskd) - Predictable read/write performance
- Low latecny
- High throughput (See: Performance )
Development
- Get the source
$ git clone https://github.com/prologic/bitcask.git
- Install required tools
This library uses Protobuf to serialize data on disk. Please follow the
instructions for installing protobuf on your system. You will also need the
following Go libraries/tools to generate Go code from Protobuf defs:
- Build the project
$ make
This will invoke go generate and go build.
Install
$ go get github.com/prologic/bitcask
Usage (library)
Install the package into your project:
$ go get github.com/prologic/bitcask
package main
import "github.com/prologic/bitcask"
func main() {
db, _ := bitcask.Open("/tmp/db")
defer db.Close()
db.Put("Hello", []byte("World"))
val, _ := db.Get("Hello")
}
See the godoc for further documentation and other examples.
Usage (tool)
$ bitcask -p /tmp/db set Hello World
$ bitcask -p /tmp/db get Hello
World
Usage (server)
There is also a builtin very simple Redis-compatible server called bitcaskd:
$ ./bitcaskd ./tmp
INFO[0000] starting bitcaskd v0.0.7@146f777 bind=":6379" path=./tmp
Example session:
$ telnet localhost 6379
Trying ::1...
Connected to localhost.
Escape character is '^]'.
SET foo bar
+OK
GET foo
$3
bar
DEL foo
:1
GET foo
$-1
PING
+PONG
QUIT
+OK
Connection closed by foreign host.
Docker
You can also use the Bitcask Docker Image:
$ 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:
$ make bench
...
BenchmarkGet/128B-4 500000 2537 ns/op 672 B/op 7 allocs/op
BenchmarkGet/256B-4 500000 2629 ns/op 1056 B/op 7 allocs/op
BenchmarkGet/512B-4 500000 2773 ns/op 1888 B/op 7 allocs/op
BenchmarkGet/1K-4 500000 3202 ns/op 3552 B/op 7 allocs/op
BenchmarkGet/2K-4 300000 3904 ns/op 6880 B/op 7 allocs/op
BenchmarkGet/4K-4 300000 5678 ns/op 14048 B/op 7 allocs/op
BenchmarkGet/8K-4 200000 8948 ns/op 27360 B/op 7 allocs/op
BenchmarkGet/16K-4 100000 14635 ns/op 53472 B/op 7 allocs/op
BenchmarkGet/32K-4 50000 28292 ns/op 114912 B/op 7 allocs/op
BenchmarkPut/128B-4 200000 8173 ns/op 409 B/op 6 allocs/op
BenchmarkPut/256B-4 200000 8404 ns/op 538 B/op 6 allocs/op
BenchmarkPut/512B-4 200000 9741 ns/op 829 B/op 6 allocs/op
BenchmarkPut/1K-4 100000 13118 ns/op 1411 B/op 6 allocs/op
BenchmarkPut/2K-4 100000 17982 ns/op 2573 B/op 6 allocs/op
BenchmarkPut/4K-4 50000 35477 ns/op 5154 B/op 6 allocs/op
BenchmarkPut/8K-4 30000 54021 ns/op 9804 B/op 6 allocs/op
BenchmarkPut/16K-4 20000 96551 ns/op 18849 B/op 6 allocs/op
BenchmarkPut/32K-4 10000 129957 ns/op 41561 B/op 7 allocs/op
BenchmarkScan-4 1000000 2011 ns/op 493 B/op 25 allocs/op
For 128B values:
- ~400,000 reads/sec
- ~130,000 writes/sec
The full benchmark above shows linear performance as you increase key/value sizes.
License
bitcask is licensed under the MIT License