Mysql读写分离

本想采用Mysql Proxy来实现读写分离，奈何其使用的lua脚本着实让人头痛，最后决定采用国人开发的开源数据库代理中间件Amoeba。使用Amoeba，只需要简单的xml配置，就可以很容易地实现读写分离。

Amoeba处于应用程序和数据库服务器之间，充当一个中间代理层。其支持负载均衡、高可用性、Query过滤、读写分离、可路由相关的query到目标数据库、可并发请求多台数据库合并结果。功能很强大。

Amoeba默认的端口为8066，实现了Mysql协议。应用程序中只需要修改一个数据库连接就可以实现采用Amoeba来代理数据库访问。比如：Java应用中，假如你原来的jdbc连接字符串为：jdbc:mysql://192.168.168.42:3306/minishop，那么现在，你想使用Amoeba作为数据库访问代理，则只需要将上面连接字符串改为如下(假如Amoeba所在机子IP为192.168.168.88)：jdbc:mysql://192.168.168.88:8066/minishop。Amoeba透明性做的很赞。

主要还是配置Amoeda，但是配置也是相当的简单。基本只需要配置两个文件：conf\dbServers.xml和conf\amoeba.xml。配置中各项的含义，可以参考amoeda中文指南，这里不做过多解释。仅记录下配置。

dbServers.xml主要配置

<amoeba:dbServers xmlns:amoeba="http://amoeba.meidusa.com/">  

 

        <!--   

            Each dbServer needs to be configured into a Pool,  

            If you need to configure multiple dbServer with load balancing that can be simplified by the following configuration:  

             add attribute with name virtual = "true" in dbServer, but the configuration does not allow the element with name factoryConfig  

             such as 'multiPool' dbServer     

        -->  

          

    <dbServer name="abstractServer" abstractive="true">  

        <factoryConfig class="com.meidusa.amoeba.mysql.net.MysqlServerConnectionFactory">  

            <property name="manager">${defaultManager}</property>  

            <property name="sendBufferSize">64</property>  

            <property name="receiveBufferSize">128</property>  

                  

            <!-- mysql port -->  

            <property name="port">3306</property>  

              

            <!-- mysql schema -->  

            <property name="schema">minishop</property>  

              

            <!-- mysql user -->  

            <property name="user">chenjie</property>  

              

            <!--  mysql password -->  

            <property name="password">chenjie</property>  

 

        </factoryConfig>  

 

        <poolConfig class="com.meidusa.amoeba.net.poolable.PoolableObjectPool">  

            <property name="maxActive">500</property>  

            <property name="maxIdle">500</property>  

            <property name="minIdle">10</property>  

   
4000
         <property name="minEvictableIdleTimeMillis">600000</property>  

            <property name="timeBetweenEvictionRunsMillis">600000</property>  

            <property name="testOnBorrow">true</property>  

            <property name="testWhileIdle">true</property>  

        </poolConfig>  

    </dbServer>  

 

    <dbServer name="master"  parent="abstractServer">  

        <factoryConfig>  

            <!-- mysql ip -->  

            <property name="ipAddress">192.168.168.253</property>  

        </factoryConfig>  

    </dbServer>  

 

    <dbServer name="slave1"  parent="abstractServer">  

        <factoryConfig>  

            <!-- mysql ip -->  

            <property name="ipAddress">192.168.168.119</property>  

        </factoryConfig>  

    </dbServer>  

 

    <dbServer name="slave2"  parent="abstractServer">  

        <factoryConfig>  

            <!-- mysql ip -->  

            <property name="ipAddress">192.168.168.251</property>  

 

        </factoryConfig>  

    </dbServer>  

      

    <dbServer name="multiPool" virtual="true">  

        <poolConfig class="com.meidusa.amoeba.server.MultipleServerPool">  

            <!-- Load balancing strategy: 1=ROUNDROBIN , 2=WEIGHTBASED , 3=HA-->  

            <property name="loadbalance">1</property>  

              

            <!-- Separated by commas,such as: server1,server2,server1 -->  

            <property name="poolNames">slave1,slave2</property>  

        </poolConfig>  

    </dbServer>  

          

</amoeba:dbServers>

amoeba.xml配置：

<amoeba:configuration xmlns:amoeba="http://amoeba.meidusa.com/">  

 

    <proxy>  

      

        <!-- service class must implements com.meidusa.amoeba.service.Service -->  

        <service name="Amoeba for Mysql" class="com.meidusa.amoeba.net.ServerableConnectionManager">  

            <!-- port -->  

            <property name="port">8066</property>  

              

            <!-- bind ipAddress -->  

 

            <property name="ipAddress">192.168.168.253</property>  

 

              

            <property name="manager">${clientConnectioneManager}</property>  

              

            <property name="connectionFactory">  

                <bean class="com.meidusa.amoeba.mysql.net.MysqlClientConnectionFactory">  

                    <property name="sendBufferSize">128</property>  

                    <property name="receiveBufferSize">64</property>  

                </bean>  

            </property>  

              

            <property name="authenticator">  

                <bean class="com.meidusa.amoeba.mysql.server.MysqlClientAuthenticator">  

                      

                    <property name="user">chenjie</property>  

                      

                    <property name="password">chenjie</property>  

                      

                    <property name="filter">  

                        <bean class="com.meidusa.amoeba.server.IPAccessController">  

                            <property name="ipFile">${amoeba.home}/conf/access_list.conf</property>  

                        </bean>  

                    </property>  

                </bean>  

            </property>  

              

        </service>  

          

        <!-- server class must implements com.meidusa.amoeba.service.Service -->  

        <service name="Amoeba Monitor Server" class="com.meidusa.amoeba.monitor.MonitorServer">  

            <!-- port -->  

            <!--  default value: random number  

            <property name="port">9066</property>  

            -->  

            <!-- bind ipAddress -->  

            <property name="ipAddress">127.0.0.1</property>  

            <property name="daemon">true</property>  

            <property name="manager">${clientConnectioneManager}</property>  

            <property name="connectionFactory">  

                <bean class="com.meidusa.amoeba.monitor.net.MonitorClientConnectionFactory"></bean>  

            </property>  

              

        </service>  

          

        <runtime class="com.meidusa.amoeba.mysql.context.MysqlRuntimeContext">  

            <!-- proxy server net IO Read thread size -->  

            <property name="readThreadPoolSize">20</property>  

              

            <!-- proxy server client process thread size -->  

            <property name="clientSideThreadPoolSize">30</property>  

              

            <!-- mysql server data packet process thread size -->  

            <property name="serverSideThreadPoolSize">30</property>  

              

            <!-- per connection cache prepared statement size  -->  

            <property name="statementCacheSize">500</property>  

              

            <!-- query timeout( default: 60 second , TimeUnit:second) -->  

            <property name="queryTimeout">60</property>  

        </runtime>  

          

    </proxy>  

      

    <!--   

        Each ConnectionManager will start as thread  

        manager responsible for the Connection IO read , Death Detection  

    -->  

    <connectionManagerList>  

        <connectionManager name="clientConnectioneManager" class="com.meidusa.amoeba.net.MultiConnectionManagerWrapper">  

            <property name="subManagerClassName">com.meidusa.amoeba.net.ConnectionManager</property>  

            <!--   

              default value is avaliable Processors   

            <property name="processors">5</property>  

             -->  

        </connectionManager>  

        <connectionManager name="defaultManager" class="com.meidusa.amoeba.net.MultiConnectionManagerWrapper">  

            <property name="subManagerClassName">com.meidusa.amoeba.net.AuthingableConnectionManager</property>  

              

            <!--   

              default value is avaliable Processors   

            <property name="processors">5</property>  

             -->  

        </connectionManager>  

    </connectionManagerList>  

      

        <!-- default using file loader -->  

    <dbServerLoader class="com.meidusa.amoeba.context.DBServerConfigFileLoader">  

        <property name="configFile">${amoeba.home}/conf/dbServers.xml</property>  

    </dbServerLoader>  

      

    <queryRouter class="com.meidusa.amoeba.mysql.parser.MysqlQueryRouter">  

        <property name="ruleLoader">  

            <bean class="com.meidusa.amoeba.route.TableRuleFileLoader">  

                <property name="ruleFile">${amoeba.home}/conf/rule.xml</property>  

                <property name="functionFile">${amoeba.home}/conf/ruleFunctionMap.xml</property>  

            </bean>  

        </property>  

        <property name="sqlFunctionFile">${amoeba.home}/conf/functionMap.xml</property>  

        <property name="LRUMapSize">1500</property>  

 

        <property name="defaultPool">master</property>  

          

 

        <property name="writePool">master</property>  

        <property name="readPool">multiPool</property>  

 

        <property name="needParse">true</property>  

    </queryRouter>  

</amoeba:configuration>

#后来测试一主多从，又加入了一台Mysql从数据库服务器，这就是为什么上面amoeba配置中多了一个IP为119的原因。