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https://github.com/YoungPioneers/mgq

memcached go queue
https://github.com/YoungPioneers/mgq

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memcached go queue

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# Introduction

Memcached Go Queue, 简称mgq, 是一个用[Go](https://golang.org)语言写的,基于memcached协议的消息队列。其父亲[mcq](https://github.com/stvchu/memcacheq.git)是最早应用于[weibo](http://weibo.com)的基础消息中间件,有着高性能,解耦的优点,使得其广泛应用于微博

# Features

mgq是一个基于NOSQL数据库[BerkeleyDB](http://www.oracle.com/technetwork/cn/database/database-technologies/berkeleydb/overview/index.html)写的FIFO消息队列,目前支持的特性如下:

* 一写多读:举个例子,set myqueue 'one message',只要get的时候,myqueue开头,#分隔,如myqueue#1,多个客户端之间读是彼此独立的,是不受影响的
* 默认的get是读取队列中未读取的最旧消息
* 支持getc操作,支持获取队列中某一个cursor位置的数据:举个例子,假设myqueue已经有1000条数据,getc myqueue 99,就可以获取队列当中cursor为99的消息
* 支持getr操作,支持获取队列中某一个start cursor位置开始,到end的数据:举个例子,假设myqueue已经有20条数据,getr myqueue 1 10 ,就可以获取队列当中cursor为[1-10]的消息 「内测中」

* getn支持timeout机制的阻塞api来获取队列中的最新消息,举个例子:getn queue 10,意味着10s内有数据则立马返回,否则会10s后立马返回数据不存在的错误,默认getn的timeout是0s,永不超时(需要注意的是如果客户端有getn的操作,则set的另一个客户端需要调用setn)

# Benchmark
针对消息的丢失率,做了一下单个set和get的测试,下面的是消息数为30w,50w,100w时候的结果

message total:30w

```
mgq message set total:300000, cost total time:123518222205 ns, 2428 per/s ,fail set total:0
mgq message get total:300000, cost total time:51103619703 ns, 5870 per/s ,fail get total:0
```

message total:50w

```
mgq message set total:500000, cost total time:210480212729 ns, 2375 per/s ,fail set total:0
mgq message get total:500000, cost total time:87694742059 ns, 5701 per/s ,fail get total:0
```

message total:100w

```
mgq message set total:1000000, cost total time:422339921379 ns, 2367 per/s ,fail set total:0
mgq message get total:1000000, cost total time:173768683759 ns, 5754 per/s ,fail get total:0
```

同时简单做了一下压测,下面的结果依次是1,2,3,4个routine,单个set和get的相对平均耗时时间,[Benchmark code](https://github.com/YoungPioneers/mgq/blob/master/benchmark/mgqPerformance_test.go)

```
Benchmark_MgqMultiSetAndGet-4 2000 546617 ns/op (1829 per/s)
Benchmark_MgqMultiSetAndGet-4 2000 583259 ns/op (1714 per/s)
Benchmark_MgqMultiSetAndGet-4 2000 723603 ns/op (1381 per/s)
Benchmark_MgqMultiSetAndGet-4 2000 754741 ns/op (1324 per/s)

```

# Installation

* 首先要安装BerkeleyDB,以版本6.1.26为例,下载[db-6.1.26.tar.gz](http://www.oracle.com/technetwork/cn/database/database-technologies/berkeleydb/downloads/index.html),执行

```
tar -zxvf db-6.1.26.tar.gz
cd db-6.1.26;dist/configure --includedir=/usr/include --libdir=/usr/lib64/ (64位的机器)
make && sudo make install
```

默认安装到/usr/local/BerkeleyDB.6.1/,之后执行

```
git clone https://github.com/YoungPioneers/mgq
cd mgq && make
cd bin && ./mgq
```
* 默认端口为22201,可通过./mgq -h查看更多帮助

# Usage

查看队列的统计情况

stats命令

```
telnet localhost 22201
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
stats
STAT q 0/0
STAT queue 122389/80000
END
```

set 队列名(q为队列名,按下\r\n后输入的'helloworld'为消息内容)

```
set q
helloworld
STORED
```

get 队列名

```
get q
VALUE q 0 10
helloworld
END
```

setn 队列名

```
setn q
helloworld
STORED
```

getn 队列名 timeout_second

```
getn q 5
VALUE q 0 10
helloworld
END
```

getc 队列名 cursor

```
getc q 9
VALUE q 0 11
helloworld9
END
```

delete 队列名

```
delete queue
DELETED
```

client example in [examples](https://github.com/YoungPioneers/mgq/blob/master/examples)

# ToDo
[todo](https://github.com/YoungPioneers/mgq/blob/master/todo)

# ChangeLog
[ChangeLog](https://github.com/YoungPioneers/mgq/blob/master/ChangeLog)

# License
under the MIT License