Mycat读写分离实践

背景：
之前在一家创业公司工作，公司从事零售行业，刚开始店铺数量少，Mysql架构只是单一的主从复制架构，完全满足业务需求，随着公司开店数量不断地增加，数据量及访问量也不断，QPS明显增加，APP端出现慢的现象
架构师提出分库，读写分离，考虑到分库影响，先通过Mycat做读写分离，如下为Mycat配置文件
环境：
采用一台Mycat+（mysql一主+2从库） 从库使用Mycat的负载均衡功能
如下为Mycat配置过程：

  schema.xml配置信息：

<?xml version="1.0"?>

<mycat:schema xmlns:mycat=“http://io.mycat/”>

<schema name="earth_db1" checkSQLschema="true" >
<table name="b2c_good_pack_info" dataNode="dn1" />                 
  ..........                      

</schema>
<schema name="earth_db2" checkSQLschema="true" >
<table name="b2c_good_pack_info" dataNode="dn0" />                 
   ................                  

<dataNode name="dn0" dataHost="jdbchost0" database="earth_market" />
<dataNode name="dn1" dataHost="jdbchost1" database="earth_market" />
<dataHost name="jdbchost0" maxCon="500" minCon="10" balance="1" 
    writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
    <heartbeat>select user()</heartbeat>
    <writeHost host="hostM1" url="XXXX主:3306" user="mycatEarth" password="123456" >
    <readHost host="hostS1" url="XXXX从:3306" user="mycatEarth" password="123456" />
    </writeHost>
</dataHost>

select user()

</mycat:schema>

server.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>

<mycat:server xmlns:mycat=“http://io.mycat/”>

0
1
0
0

	<property name="sequnceHandlerType">2</property>
<property name="subqueryRelationshipCheck">false</property> <!-- 子查询中存在关联查询的情况下,检查关联字段中是否有分片字段 .默认 false -->
  <!--  <property name="useCompression">1</property>--> <!--1为开启mysql压缩协议-->
    <!--  <property name="fakeMySQLVersion">5.6.20</property>--> <!--设置模拟的MySQL版本号-->
<!-- <property name="processorBufferChunk">40960</property> -->
<!-- 
<property name="processors">1</property> 
<property name="processorExecutor">32</property> 
 -->
    <!--默认为type 0: DirectByteBufferPool | type 1 ByteBufferArena | type 2 NettyBufferPool -->
	<property name="processorBufferPoolType">0</property>
	<!--默认是65535 64K 用于sql解析时最大文本长度 -->
	<!--<property name="maxStringLiteralLength">65535</property>-->
	<!--<property name="sequnceHandlerType">0</property>-->
	<!--<property name="backSocketNoDelay">1</property>-->
	<!--<property name="frontSocketNoDelay">1</property>-->
	<!--<property name="processorExecutor">16</property>-->
    <property name="serverPort">8099</property> <property name="managerPort">9077</property>
    <property name="idleTimeout">1800000</property>
    <property name="maxPacketSize">1073741824</property>
    <property name="sqlExecuteTimeout">999999999</property>
    <property name="processors">6</property> 
    <property name="processorExecutor">32</property>
    <property name="processorBufferChunk">8192</property>
    <property name="processorBufferPool">204800000</property>
    <property name="frontWriteQueueSize">4096</property>
	<!--
		<property name="serverPort">8066</property> <property name="managerPort">9066</property> 
		<property name="idleTimeout">300000</property> <property name="bindIp">0.0.0.0</property> 
		<property name="frontWriteQueueSize">4096</property> <property name="processors">32</property> -->
	<!--分布式事务开关，0为不过滤分布式事务，1为过滤分布式事务（如果分布式事务内只涉及全局表，则不过滤），2为不过滤分布式事务,但是记录分布式事务日志-->
	<property name="handleDistributedTransactions">0</property>
	
		<!--
		off heap for merge/order/group/limit      1开启   0关闭
	-->
	<property name="useOffHeapForMerge">1</property>

	<!--
		单位为m
	-->
    <property name="memoryPageSize">64k</property>

	<!--
		单位为k
	-->
	<property name="spillsFileBufferSize">1k</property>

	<property name="useStreamOutput">0</property>

	<!--
		单位为m
	-->
	<property name="systemReserveMemorySize">384m</property>


	<!--是否采用zookeeper协调切换  -->
	<property name="useZKSwitch">false</property>

	<!-- XA Recovery Log日志路径 -->
	<!--<property name="XARecoveryLogBaseDir">./</property>-->

	<!-- XA Recovery Log日志名称 -->
	<!--<property name="XARecoveryLogBaseName">tmlog</property>-->

</system>

<!-- 全局SQL防火墙设置 -->
<!--白名单可以使用通配符%或着*-->
<!--例如<host host="127.0.0.*" user="root"/>-->
<!--例如<host host="127.0.*" user="root"/>-->
<!--例如<host host="127.*" user="root"/>-->
<!--例如<host host="1*7.*" user="root"/>-->
<!--这些配置情况下对于127.0.0.1都能以root账户登录-->
<!--
<firewall>
   <whitehost>
      <host host="1*7.0.0.*" user="root"/>
   </whitehost>
   <blacklist check="false">
   </blacklist>
</firewall>
-->

<user name="X" defaultAccount="true">
	<property name="password">iyWB4!6iQzA6%Mvhb7</property>
	<property name="schemas">earth_db1</property>
	
	<!-- 表级 DML 权限设置 -->
	<!-- 		
	<privileges check="false">
		<schema name="TESTDB" dml="0110" >
			<table name="tb01" dml="0000"></table>
			<table name="tb02" dml="1111"></table>
		</schema>
	</privileges>		
	 -->
</user>

<user name="X'X'XXXXXXXXXXXXXXXXXXXXXX">
	<property name="password">X'X'XXXXXXXXXXXXXXXXX</property>
	<property name="schemas">earth_db2</property>
	<property name="readOnly">true</property>
</user>
   
    <user name="X'X'XXXX">
            <property name="password">X'X'XXXXXXXXXXX</property>
            <property name="schemas">earth_db2</property>
   
    
    </user>

    <user name="XXXXXX">
            <property name="password">XXXXXXXX</property>
            <property name="schemas">earth_db1</property> 
    </user>

</mycat:server>