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HomeDatabaseMysql Tutorial 利用gearman实现redis缓存mysql

环境:centos6.5mysql5.6gearman简介:Gearman是一个支持分布式的任务分发框架。设计简洁,获得了非常广泛的..

环境:

    centos6.5

    mysql5.6

)在mysql中的数据发生改变时触动触发器将数据传入Gearman中,这时的mysql相当于Gearman的clinet。然后运行自己编写的php程序作为worker,将Gearman中的数据传到Redis中去,这时的Redis相当于是Gearman的consumer。


1、安装gearman

    实验中的系统yum源在centos6.5自带的网络yum源的基础上,增加了epel的源,EPEL (Extra Packages for Enterprise Linux,企业版Linux的额外软件包) 是Fedora小组维护的一个软件仓库项目,为RHEL/CentOS提供他们默认不提供的软件包。使用这个源可以免去很多麻烦,省去源码编译的麻烦,需要注意的是,不论是使用centos自带的网络yum源还是epel扩展源,,都需要你的IP能够访问到公网。

    安装gearman、php、php的gearman扩展、nc工具

yum install -y php-pecl-gearman libgearman  libgearman-devel gearmand nc

    启动gearman服务

/etc/init.d/gearmand start

    验证gearman是否成功启动,如果返回的结果中有4730端口,那么表示服务已经正常启动了

[root@hadoop1 ~]# netstat -alnutp |grep gearman

2、模拟Gearman的工作原理:

    使用下列命令查看Gearman的队列

watch -n 1 "(echo status; sleep 0.1) | nc 127.0.0.1 4730"

    结果如下

writeLog        0       0       0

    四列含义:1-任务名称;2-等待队列任务数;3-运行中的任务数;4-正在运行的worker进程数;


    编译一段php代码模拟Gearman的Client:client.php

addServer();     $client->doBackground('writeLog', 'Log content');     echo '文件已经在后台操作';     echo "\n";

    执行client.php

php client.php

    这时,再次查看Gearman的队列,发现等待队列中有一个任务

writeLog        1       0       0

    

    编写一段php代码模拟Gearman的Worker:worker.php

    该worker的作用是将客户端传递给Gearman的字符串'Log content'写入到当前目录下的gearman.log文件中

addServer();     $worker->addFunction('writeLog', 'writeLog');     while($worker->work());     function writeLog($job)     {         $log = $job->workload();         file_put_contents(__DIR__ . '/gearman.log', $log . "\n", FILE_APPEND | LOCK_EX);     }

    以nohup的方式后台启动worker.php

nohup php worker.php &

    再次查看Gearman的队列,发现等待的任务变成0,worker进程变成了1,gearman.log有了内容

writeLog        0       0       1[root@hadoop1 ~]# cat gearman.log  Log content

3、安装mysql-server、mysql、php-mysql(php连接mysql的驱动,非必须,这里是为了稍后用程序比较从Redis和Mysql中分别读取数据的效率)。实验中,由于我的机子上之前已将安装了mysql5.6,所以就直接使用mysql5.6做实验了。当然也可以使用yum开安装mysql,可能安装的mysql版本不是5.6,但是完全没有关系。

    安装mysql相关软件

yum install -y mysql-server mysql php-mysql

    启动mysql

/etc/init.d/mysql start

4、安装lib_mysqludf_json

wget  https://github.com/mysqludf/lib_mysqludf_json/archive/master.zip mv master master.zip unzip master.zip cd lib_mysqludf_json-master rm -rf lib_mysqludf_json.so  gcc $(mysql_config --cflags) -shared -fPIC -o lib_mysqludf_json.so lib_mysqludf_json.c

这时重新编译生成了lib_mysqludf_json.so,然后需要把lib_mysqludf_json.so拷贝到mysql的插件目录下,查看mysql的插件目录:

[root@hadoop1 ~]# mysql -u root -pupbjsxt --execute="show variables like '%plugin%';"     +---------------+--------------------------+ | Variable_name | Value                    | +---------------+--------------------------+ | plugin_dir    | /usr/lib64/mysql/plugin/ | +---------------+--------------------------+[root@hadoop1 lib_mysqludf_json-master]# cp lib_mysqludf_json.so /usr/lib64/mysql/plugin/
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