a407905ae2
* avoid unnecessary use of encoder/decoder to decrease memory allocations * add an optional configurable mempool to avoid extra allocs * add doc.go with examples
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 latency
- 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 300000 4071 ns/op 31.43 MB/s 608 B/op 7 allocs/op
BenchmarkGet/256B-4 300000 4700 ns/op 54.46 MB/s 992 B/op 7 allocs/op
BenchmarkGet/512B-4 300000 4915 ns/op 104.17 MB/s 1824 B/op 7 allocs/op
BenchmarkGet/1K-4 200000 5064 ns/op 202.20 MB/s 3488 B/op 7 allocs/op
BenchmarkGet/2K-4 200000 6276 ns/op 326.31 MB/s 6816 B/op 7 allocs/op
BenchmarkGet/4K-4 200000 8960 ns/op 457.11 MB/s 13984 B/op 7 allocs/op
BenchmarkGet/8K-4 100000 12465 ns/op 657.16 MB/s 27296 B/op 7 allocs/op
BenchmarkGet/16K-4 100000 19233 ns/op 851.84 MB/s 53408 B/op 7 allocs/op
BenchmarkGet/32K-4 50000 33106 ns/op 989.77 MB/s 114848 B/op 7 allocs/op
BenchmarkPut/128B-4 100000 13659 ns/op 9.37 MB/s 409 B/op 6 allocs/op
BenchmarkPut/256B-4 100000 14854 ns/op 17.23 MB/s 539 B/op 6 allocs/op
BenchmarkPut/512B-4 100000 20823 ns/op 24.59 MB/s 829 B/op 6 allocs/op
BenchmarkPut/1K-4 50000 28086 ns/op 36.46 MB/s 1411 B/op 6 allocs/op
BenchmarkPut/2K-4 30000 40797 ns/op 50.20 MB/s 2574 B/op 6 allocs/op
BenchmarkPut/4K-4 20000 75518 ns/op 54.24 MB/s 5155 B/op 6 allocs/op
BenchmarkPut/8K-4 10000 122544 ns/op 66.85 MB/s 9811 B/op 6 allocs/op
BenchmarkPut/16K-4 10000 201167 ns/op 81.44 MB/s 18851 B/op 6 allocs/op
BenchmarkPut/32K-4 5000 350850 ns/op 93.40 MB/s 41565 B/op 7 allocs/op
BenchmarkScan-4 1000000 1867 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