Mysql 基于 Amoeba 的 读写分离

首先说明一下amoeba 跟 MySQL proxy在读写分离的使用上面的区别：

在MySQL proxy 6.0版本 上面如果想要读写分离并且 读集群、写集群 机器比较多情况下，用mysql proxy 需要相当大的工作量，目前mysql proxy没有现成的 lua脚本。mysql proxy根本没有配置文件， lua脚本就是它的全部，当然lua是相当方便的。那么同样这种东西需要编写大量的脚本才能完成一 个复杂的配置。而Amoeba只需要进行相关的配置就可以满足需求。

假设有这样的使用场景，有三个数据库节点分别命名为Master、Slave1、Slave2如下：

Amoeba: Amoeba <192.168.14.129>

Master： Master <192.168.14.131> （可读写）

Slaves：Slave1 <192.168.14.132>、Slave2<192.168.14.133> （2个平等的数据库。只读/负载均衡）

在 主从数据库 的复制的部分， 任然需要使用数据库自己的复制机制。 Amoeba 不提供复制功能。

1. 起动数据库的主从复制功能。

a. 修改配置文件

master.cnf

server-id = 1 #主数据库标志

# 增加 日志文件， 用于验证读写分离
log = /home/mysql/mysql/log/mysql.log

server-id = 1 #主数据库标志
# 增加 日志文件， 用于验证读写分离
log = /home/mysql/mysql/log/mysql.log

slave1.cnf

server-id = 2

# 增加 日志文件， 用于验证读写分离
log = /home/mysql/mysql/log/mysql.log

server-id = 2
# 增加 日志文件， 用于验证读写分离
log = /home/mysql/mysql/log/mysql.log

slave2.cnf

server-id = 3

# 增加 日志文件， 用于验证读写分离
log = /home/mysql/mysql/log/mysql.log

server-id = 3
# 增加 日志文件， 用于验证读写分离
log = /home/mysql/mysql/log/mysql.log

b. Master 中 创建两个 只读权限 的用户。 用户名均为：repl_user 密码均为：copy 分别开放给 slave1， slave2

mysql> grant replication slave on *.* to [email protected] identified by 'copy';

mysql> grant replication slave on *.* to [email protected] identified by 'copy';

mysql> grant replication slave on *.* to [email protected] identified by 'copy';
mysql> grant replication slave on *.* to [email protected] identified by 'copy';

c. 查看 Master 信息

mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000017 | 2009 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000017 |     2009 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

d. Slave1 ，Slave2 中 启动 Master - Slave 复制功能。

分别执行以下命令

mysql> slave stop;
Query OK, 0 rows affected (0.02 sec)

mysql> change master to
-> master_host='192.168.14.131',
-> master_user='repl_user',
-> master_password='copy',
-> master_log_file='mysql-bin.000017',
-> master_log_pos=2009;
Query OK, 0 rows affected (0.03 sec)

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

mysql> slave stop;
Query OK, 0 rows affected (0.02 sec)
mysql> change master to
    -> master_host='192.168.14.131',
    -> master_user='repl_user',
    -> master_password='copy',
    -> master_log_file='mysql-bin.000017',
    -> master_log_pos=2009;
Query OK, 0 rows affected (0.03 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

2. Amoeba 读写分离的配置

a. Master ， Slave1 ，Slave2 中开放权限给 Amoeba 访问。

在 Master ， Slave1 ， Slave2 中分别执行

mysql> grant all on test.* to [email protected] indentified by '1234';

mysql> grant all on test.* to [email protected] indentified by '1234';

Amoeba 访问三个数据库的账号密码相同。

b. 修改 Amoeba 的配置文件

配置文件详细说明请查看 官方文档： http://docs.hexnova.com/amoeba/rw-splitting.html

dbServer.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
-->

<!-- 数据库连接配置的公共部分 -->
<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">test</property>

<!-- mysql user -->
<property name="user">test_user</property>

<!-- mysql password -->
<property name="password">1234</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>
<property name="minEvictableIdleTimeMillis">600000</property>
<property name="timeBetweenEvictionRunsMillis">600000</property>
<property name="testOnBorrow">true</property>
<property name="testWhileIdle">true</property>
</poolConfig>
</dbServer>

<!-- Master ，Slave1， Slave2 的独立部分，也就只有 IP 了 -->
<dbServer name="master" parent="abstractServer">
<factoryConfig>
<!-- mysql ip -->
<property name="ipAddress">192.168.14.131</property>
</factoryConfig>
</dbServer>

<dbServer name="slave1" parent="abstractServer">
<factoryConfig>
<!-- mysql ip -->
<property name="ipAddress">192.168.14.132</property>
</factoryConfig>
</dbServer>

<dbServer name="slave2" parent="abstractServer">
<factoryConfig>
<!-- mysql ip -->
<property name="ipAddress">192.168.14.133</property>
</factoryConfig>
</dbServer>

<!-- 数据库池，虚拟服务器，实现读取的负载均衡 -->
<dbServer name="slaves" 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>

<?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   
		-->
	<!-- 数据库连接配置的公共部分 -->	
	<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">test</property>
			
			<!-- mysql user -->
			<property name="user">test_user</property>
			
			<!--  mysql password -->
			<property name="password">1234</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>
			<property name="minEvictableIdleTimeMillis">600000</property>
			<property name="timeBetweenEvictionRunsMillis">600000</property>
			<property name="testOnBorrow">true</property>
			<property name="testWhileIdle">true</property>
		</poolConfig>
	</dbServer>
	<!-- Master ，Slave1， Slave2 的独立部分，也就只有 IP 了 -->
	<dbServer name="master"  parent="abstractServer">
		<factoryConfig>
			<!-- mysql ip -->
			<property name="ipAddress">192.168.14.131</property>
		</factoryConfig>
	</dbServer>
	<dbServer name="slave1"  parent="abstractServer">
		<factoryConfig>
			<!-- mysql ip -->
			<property name="ipAddress">192.168.14.132</property>
		</factoryConfig>
	</dbServer>
	<dbServer name="slave2"  parent="abstractServer">
		<factoryConfig>
			<!-- mysql ip -->
			<property name="ipAddress">192.168.14.133</property>
		</factoryConfig>
	</dbServer>	
	
	<!-- 数据库池，虚拟服务器，实现读取的负载均衡 -->
	<dbServer name="slaves" 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

<?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.net.ServerableConnectionManager">
<!-- Amoeba 端口号 -->
<property name="port">8066</property>

<!-- bind ipAddress -->
<!--
<property name="ipAddress">127.0.0.1</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">
<!-- Amoeba 账号，密码 -->
<property name="user">root</property>

<property name="password">root</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>
<!-- 默认数据库，主数据库 -->
<property name="defaultPool">master</property>

<!-- 写数据库 -->
<property name="writePool">master</property>
<!-- 读数据库，dbServer.xml 中配置的 虚拟数据库，数据库池 -->
<property name="readPool">slaves</property>

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