怎样实现Mycat读写分离与负载均衡,很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
我们来学习读写分离与负载均衡
先看一下balance 属性
负载均衡类型,目前的取值有3种:
1. balance="0", 不开启读写分离机制,所有读操作都发送到当前可用的writeHost上。
2. balance="1",全部的readHost与stand by writeHost参与select语句的负载均衡,简单的说,当双主双从模式(M1->S1,M2->S2,并且M1与 M2互为主备),正常情况下,M2,S1,S2都参与select语句的负载均衡。
3. balance="2",所有读操作都随机的在writeHost、readhost上分发。
4. balance="3",所有读请求随机的分发到wiriterHost对应的readhost执行,writerHost不负担读压力,注意balance=3只在1.4及其以后版本有,1.3没有。
负载均衡类型,目前的取值有3种:
1. writeType="0", 所有写操作发送到配置的第一个writeHost,第一个挂了切到还生存的第二个writeHost,重新启动后已切换后的为准,切换记录在配置文件中:dnindex.properties .
2. writeType="1",所有写操作都随机的发送到配置的writeHost。
3. writeType="2",没实现。 <dataNode name="dn1" dataHost="localhost1" database="examdb" />
<dataNode name="dn2" dataHost="localhost2" database="examdb" />
<dataNode name="dn3" dataHost="localhost3" database="examdb" />
<dataHost name="localhost1" maxCon="1000" minCon="10" balance="2"
writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<!-- can have multi write hosts -->
<writeHost host="hostM1" url="192.168.6.121:3306" user="root"
password="ESBecs00">
<!-- can have multi read hosts -->
</writeHost>
<writeHost host="hostS1" url="192.168.6.121:3307" user="root"
password="ESBecs00">
<!-- can have multi read hosts -->
</writeHost>
</dataHost>
<dataHost name="localhost2" maxCon="1000" minCon="10" balance="2"
writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<!-- can have multi write hosts -->
<writeHost host="hostM1" url="192.168.6.120:3306" user="root"
password="ESBecs00">
<!-- can have multi read hosts -->
</writeHost>
<writeHost host="hostS1" url="192.168.6.120:3307" user="root"
password="ESBecs00">
<!-- can have multi read hosts -->
</writeHost>
</dataHost>
<dataHost name="localhost3" maxCon="1000" minCon="10" balance="2"
writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<!-- can have multi write hosts -->
<writeHost host="hostM1" url="192.168.6.119:3306" user="root"
password="ESBecs00">
<!-- can have multi read hosts -->
</writeHost>
<writeHost host="hostM1" url="192.168.6.119:3307" user="root"
password="ESBecs00">
<!-- can have multi read hosts -->
</writeHost>
</dataHost>
#!/usr/bin/bash
root@localhost logs]# sort test-blance.log |more |uniq -c
30 this is 119
writeType属性
所以我们根据第二种方式做负载均衡
测试
如上:6台机器全部都有读到,读负载均衡成功
for((i=1;i<=1000;i++))
do
mysql -uroot -p123456 -P8066 -h227.0.0.1 -e "select name from company" TESTDB;
done
17 this is 119:3307
28 this is 120
23 this is 120:3307
36 this is 121
26 this is 121:3307
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