mirror of
https://github.com/taigrr/bitcask
synced 2025-01-18 04:03:17 -08:00
133 lines
3.8 KiB
Markdown
133 lines
3.8 KiB
Markdown
# bitcask
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[](https://cloud.drone.io/prologic/bitcask)
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[](https://codecov.io/gh/prologic/bitcask)
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[](https://goreportcard.com/report/prologic/bitcask)
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[](https://godoc.org/github.com/prologic/bitcask)
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[](https://sourcegraph.com/github.com/prologic/bitcask?badge)
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A Bitcask (LSM+WAL) Key/Value Store written in Go.
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## Features
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* Embeddable
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* Builtin CLI
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* Builtin Redis-compatible server
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* Predictable read/write performance
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* Low latecny
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* High throughput (See: [Performance](README.md#Performance)
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## Install
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```#!bash
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$ go get github.com/prologic/bitcask
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```
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## Usage (library)
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Install the package into your project:
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```#!bash
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$ go get github.com/prologic/bitcask
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```
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```#!go
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package main
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import (
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"log"
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"github.com/prologic/bitcask"
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)
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func main() {
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db, _ := bitcask.Open("/tmp/db")
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db.Set("Hello", []byte("World"))
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db.Close()
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}
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```
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See the [godoc](https://godoc.org/github.com/prologic/bitcask) for further
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documentation and other examples.
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## Usage (tool)
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```#!bash
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$ bitcask -p /tmp/db set Hello World
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$ bitcask -p /tmp/db get Hello
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World
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```
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## Usage (server)
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There is also a builtin very simple Redis-compatible server called `bitcaskd`:
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```#!bash
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$ ./bitcaskd ./tmp
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INFO[0000] starting bitcaskd v0.0.7@146f777 bind=":6379" path=./tmp
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```
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Example session:
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```
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$ telnet localhost 6379
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Trying ::1...
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Connected to localhost.
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Escape character is '^]'.
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SET foo bar
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+OK
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GET foo
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$3
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bar
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DEL foo
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:1
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GET foo
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$-1
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PING
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+PONG
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QUIT
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+OK
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Connection closed by foreign host.
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```
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## Performance
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Benchmarks run on a 11" Macbook with a 1.4Ghz Intel Core i7:
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```
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$ make bench
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...
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BenchmarkGet/128B-4 300000 5144 ns/op 400 B/op 5 allocs/op
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BenchmarkGet/256B-4 300000 5166 ns/op 656 B/op 5 allocs/op
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BenchmarkGet/512B-4 300000 5284 ns/op 1200 B/op 5 allocs/op
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BenchmarkGet/1K-4 200000 5779 ns/op 2288 B/op 5 allocs/op
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BenchmarkGet/2K-4 200000 6396 ns/op 4464 B/op 5 allocs/op
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BenchmarkGet/4K-4 200000 7716 ns/op 9072 B/op 5 allocs/op
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BenchmarkGet/8K-4 200000 9802 ns/op 17776 B/op 5 allocs/op
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BenchmarkGet/16K-4 100000 13299 ns/op 34928 B/op 5 allocs/op
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BenchmarkGet/32K-4 100000 21819 ns/op 73840 B/op 5 allocs/op
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BenchmarkPut/128B-4 100000 12746 ns/op 825 B/op 8 allocs/op
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BenchmarkPut/256B-4 100000 12937 ns/op 954 B/op 8 allocs/op
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BenchmarkPut/512B-4 100000 14610 ns/op 1245 B/op 8 allocs/op
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BenchmarkPut/1K-4 100000 16920 ns/op 1825 B/op 8 allocs/op
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BenchmarkPut/2K-4 100000 22075 ns/op 2987 B/op 8 allocs/op
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BenchmarkPut/4K-4 30000 40544 ns/op 5566 B/op 8 allocs/op
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BenchmarkPut/8K-4 20000 63392 ns/op 10210 B/op 8 allocs/op
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BenchmarkPut/16K-4 10000 108667 ns/op 19244 B/op 8 allocs/op
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BenchmarkPut/32K-4 10000 129256 ns/op 41920 B/op 8 allocs/op
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BenchmarkScan-4 1000000 1858 ns/op 493 B/op 25 allocs/op
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```
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For 128B values:
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* ~180,000 reads/sec
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* ~80,000 writes/sec
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The full benchmark above shows linear performance as you increase key/value sizes.
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## License
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bitcask is licensed under the [MIT License](https://github.com/prologic/bitcask/blob/master/LICENSE)
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