amoeba数据库中间件透明实现MYSQL读写分离

Amoeba(变形虫)项目,该开源框架于2008年 开始发布一款 Amoeba for Mysql软件。这个软件致力于MySQL的分布式数据库前端代理层，它主要在应用层访问MySQL的 时候充当SQL路由功能，专一于分布式数据库代理层（Database Proxy）开发。座落与 Client、DB Server(s)之间,对客户端透明。具备负载均衡、高可用性、SQL 过滤、读写分离、可路由相关的到目标数据库、可并发请求多台数据库合并结果。 经过Amoeba你可以完成多数据源的高可用、负载均衡、数据切片的功能，目前Amoeba已在不少 企业的生产线上面使用。

配置amoeba数据库中间件实现MYSQL的读写分离的步骤以下

1. 下载amoeba数据库中间件，这里我以amoeba-mysql-3.0.5-RC版本为例

2. 解压配置conf目录下的dbServers.xml

<?xml version="1.0" encoding="gbk"?>

<!DOCTYPE amoeba:dbServers SYSTEM "dbserver.dtd">
<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="connectionManager">${defaultManager}</property>
			<property name="sendBufferSize">64</property>
			<property name="receiveBufferSize">128</property>
				
			<!-- mysql port -->
			<!--<property name="port">3306</property>-->
			
			<!-- mysql schema -->
			<property name="schema">shop</property>
			
			<!-- mysql user -->
			<!--<property name="user">root</property>-->
			
			<!--<property name="password">root</property>-->
		</factoryConfig>

		<poolConfig class="com.meidusa.toolkit.common.poolable.PoolableObjectPool">
			<property name="maxActive">500</property>
			<property name="maxIdle">500</property>
			<property name="minIdle">1</property>
			<property name="minEvictableIdleTimeMillis">600000</property>
			<property name="timeBetweenEvictionRunsMillis">600000</property>
			<property name="testOnBorrow">true</property>
			<property name="testOnReturn">true</property>
			<property name="testWhileIdle">true</property>
		</poolConfig>
	</dbServer>

	<dbServer name="master"  parent="abstractServer">
		<factoryConfig>
			<!-- mysql ip -->
			<property name="ipAddress">127.0.0.1</property>
			<!-- mysql port -->
			<property name="port">3306</property>
			<!-- mysql user -->
			<property name="user">root</property>
			<property name="password">root</property>
		</factoryConfig>
	</dbServer>
	
	<dbServer name="slave1"  parent="abstractServer">
		<factoryConfig>
			<!-- mysql ip -->
			<property name="ipAddress">127.0.0.1</property>
			<!-- mysql port -->
			<property name="port">3307</property>
			<!-- mysql user -->
			<property name="user">root</property>
			<property name="password">root</property>
		</factoryConfig>
	</dbServer>
	
	<dbServer name="slave2"  parent="abstractServer">
		<factoryConfig>
			<!-- mysql ip -->
			<property name="ipAddress">127.0.0.1</property>
			<!-- mysql port -->
			<property name="port">3308</property>
			<!-- mysql user -->
			<property name="user">root</property>
			<property name="password">root</property>
		</factoryConfig>
	</dbServer>
	
	<dbServer name="virtualSlave" 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>

3. 配置amoeba.xml文件

<?xml version="1.0" encoding="gbk"?>

<!DOCTYPE amoeba:configuration SYSTEM "amoeba.dtd">
<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.mysql.server.MySQLService">
			<!-- port -->
			<property name="port">8066</property>
			
			<!-- bind ipAddress -->
			<!-- 
			<property name="ipAddress">127.0.0.1</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="authenticateProvider">
				<bean class="com.meidusa.amoeba.mysql.server.MysqlClientAuthenticator">
					
					<property name="user">root</property>
					
					<property name="password">root</property>
					
					<property name="filter">
						<bean class="com.meidusa.toolkit.net.authenticate.server.IPAccessController">
							<property name="ipFile">${amoeba.home}/conf/access_list.conf</property>
						</bean>
					</property>
				</bean>
			</property>
			
		</service>
		
		<runtime class="com.meidusa.amoeba.mysql.context.MysqlRuntimeContext">
			
			<!-- proxy server client process thread size -->
			<property name="executeThreadSize">128</property>
			
			<!-- per connection cache prepared statement size  -->
			<property name="statementCacheSize">500</property>
			
			<!-- default charset -->
			<property name="serverCharset">utf8</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="defaultManager" class="com.meidusa.toolkit.net.MultiConnectionManagerWrapper">
			<property name="subManagerClassName">com.meidusa.toolkit.net.AuthingableConnectionManager</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">virtualSlave</property>

		<property name="needParse">true</property>
	</queryRouter>
</amoeba:configuration>

4. 在命令行模式下进入bin目录下，运行launcher命令

5. 运行测试，测试amoeba是否工做，也可经过mysql -uroot -proot -P8066链接查看是否工做