mycat-讀寫分離

 

Mycat-server-1.6.7.4-release-20200105164103-linux.tar.gz


server.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
	<system>
		<property name="nonePasswordLogin">0</property>
		<property name="useHandshakeV10">1</property>
		<property name="useSqlStat">0</property>
		<property name="useGlobleTableCheck">0</property>
		<property name="sequnceHandlerType">2</property>
		<property name="subqueryRelationshipCheck">false</property>
		<property name="processorBufferPoolType">0</property>
		<property name="handleDistributedTransactions">0</property>
		<property name="useOffHeapForMerge">1</property>
		<property name="memoryPageSize">64k</property>
		<property name="spillsFileBufferSize">1k</property>
		<property name="useStreamOutput">0</property>
		<property name="systemReserveMemorySize">384m</property>
		<property name="useZKSwitch">false</property>
	</system>
	<!--這裏是設置的platform-auth用戶和虛擬邏輯庫-->
	<user name="root" defaultAccount="true">
		<property name="password">[email protected]</property>
		<property name="schemas">platform-auth,platform-config</property>
	</user>
</mycat:server>


schema.xml


<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
	<!--配置數據表-->
	<schema name="platform-auth" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1"></schema>
	<schema name="platform-config" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn2"></schema>
	<!--配置分片關係-->
	<dataNode name="dn1" dataHost="cluster1" database="platform-auth" />
	<dataNode name="dn2" dataHost="cluster2" database="platform-config" />
	<!--配置連接信息-->
	<dataHost name="cluster1" maxCon="1000" minCon="10" balance="1"
		 writeType="0" dbType="mysql" dbDriver="native" switchType="-1"
			slaveThreshold="100">
		<heartbeat>select user()</heartbeat>
		<writeHost host="W1" url="172.16.7.150:3306" user="gateway" password="gateway"></writeHost>
		<writeHost host="R1" url="172.16.7.150:3307" user="gateway" password="gateway"></writeHost>
	</dataHost>
	<dataHost name="cluster2" maxCon="1000" minCon="10" balance="1"
		 writeType="0" dbType="mysql" dbDriver="native" switchType="-1"
			slaveThreshold="100">
		<heartbeat>select user()</heartbeat>
		<writeHost host="W1" url="172.16.7.150:3306" user="gateway" password="gateway"></writeHost>
		<writeHost host="R1" url="172.16.7.150:3307" user="gateway" password="gateway"></writeHost>
	</dataHost>
</mycat:schema>



如果直接在 writeHost 配置 readHost ，發現主節點宕機後，mycat 無法 讀取從節點數據，希望後續支持
具體參考issue   https://github.com/MyCATApache/Mycat-Server/issues/2731


<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
        <!--配置數據表-->
        <schema name="platform-auth" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1">
        </schema>
        <!--配置分片關係-->
        <dataNode name="dn1" dataHost="cluster1" database="platform-auth" />
        <!--配置連接信息-->
        <dataHost name="cluster1" maxCon="1000" minCon="10" balance="3"
                 writeType="1" dbType="mysql" dbDriver="native" switchType="1"
                        slaveThreshold="100">
                <writeHost host="W1" url="172.16.7.150:3306" user="gateway" password="gateway">
                        <readHost host="W1R1" url="172.16.7.150:3307" user="gateway" password="gateway" />
                </writeHost>
        </dataHost>
</mycat:schema>