mycat入门实战

先把官网的quick start看了一遍，再自己搭，结果是各种报错，各种坑。。记录一下。。

1.环境

一台虚拟机、一台云服务器、本地Mac （我是因为云服务器和本地安装了mysql，也可以完全使用虚拟机，看你自己），mycat部署在虚拟机上，两台mysql在云服务器和本地Mac上。 ps: 最开始是下载了Mac版本的mycat，但是跑起来是各种问题，想到前些天用docker搭建nginx，想玩玩openresty，装redis的lua模块也是各种gcc报错，docker的nginx总是报什么403，最后一直没解决，用brew install nginx好好的，索性放弃了，后面有时间再研究。

2.配置文件

直接贴了。。

server.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License"); 
        - you may not use this file except in compliance with the License. - You 
        may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 
        - - Unless required by applicable law or agreed to in writing, software - 
        distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT 
        WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the 
        License for the specific language governing permissions and - limitations 
        under the License. -->
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
        <system>
                <!-- 1为开启实时统计、0为关闭 -->
        <!-- <property name="useSqlStat">0</property>   -->
        <!-- 1为开启全加班一致性检测、0为关闭 -->
        <!-- <property name="useGlobleTableCheck">0</property>   -->

                <!-- <property name="sequnceHandlerType">2</property> -->
      <!--  <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-->
                <!-- <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">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">1m</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">true</property> -->
<property name="defaultSqlParser">druidparser</property>

        </system>
        
        <!-- 全局SQL防火墙设置 -->
        <!-- 
        <firewall> 
           <whitehost>
              <host host="127.0.0.1" user="mycat"/>
              <host host="127.0.0.2" user="mycat"/>
           </whitehost>
       <blacklist check="false">
       </blacklist>
        </firewall>
        -->
        
        <user name="root">
                <property name="password">123456</property>
                <property name="schemas">testdb</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="user">
                <property name="password">user</property>
                <property name="schemas">TESTDB</property>
                <property name="readOnly">true</property>
        </user> -->

</mycat:server>

这个用户root 就是 mycat启动好后，用来登录的用户，密码就是你配置的123456

schema.xml

<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">

        <schema name="testdb" checkSQLschema="true" sqlMaxLimit="100">
                <!-- auto sharding by id (long) -->
                <!-- <table name="travelrecord" dataNode="dn1,dn2,dn3" rule="auto-sharding-long" /> -->

                <!-- global table is auto cloned to all defined data nodes ,so can join
                        with any table whose sharding node is in the same data node -->
                <!-- <table name="company" primaryKey="ID" type="global" dataNode="dn1,dn2,dn3" /> -->
                <table name="goods" primaryKey="id" dataNode="dn1,dn2" rule="mod-long"/>
                <!-- random sharding using mod sharind rule -->
                <!-- table name="hotnews" primaryKey="ID" autoIncrement="true" dataNode="dn1,dn2,dn3"
                           rule="mod-long" /> -->
                <!-- <table name="dual" primaryKey="ID" dataNode="dnx,dnoracle2" type="global"
                        needAddLimit="false"/> <table name="worker" primaryKey="ID" dataNode="jdbc_dn1,jdbc_dn2,jdbc_dn3"
                        rule="mod-long" /> -->
<!--            <table name="employee" primaryKey="ID" dataNode="dn1,dn2"
                           rule="sharding-by-intfile" />
                <table name="customer" primaryKey="ID" dataNode="dn1,dn2"
                           rule="sharding-by-intfile">
                        <childTable name="orders" primaryKey="ID" joinKey="customer_id"
                                                parentKey="id">
                                <childTable name="order_items" joinKey="order_id"
                                                        parentKey="id" />
                        </childTable>
                        <childTable name="customer_addr" primaryKey="ID" joinKey="customer_id"
                                                parentKey="id" />
                </table> -->
                <!-- <table name="oc_call" primaryKey="ID" dataNode="dn1$0-743" rule="latest-month-calldate"
                        /> -->
        </schema>
        <!-- <dataNode name="dn1$0-743" dataHost="localhost1" database="db$0-743"
                /> -->
        <dataNode name="dn1" dataHost="remoteHost" database="db1" />
        <dataNode name="dn2" dataHost="local-mac" database="db1" />
        <!-- <dataNode name="dn3" dataHost="localhost1" database="db3" /> -->
        <!--<dataNode name="dn4" dataHost="sequoiadb1" database="SAMPLE" />
         <dataNode name="jdbc_dn1" dataHost="jdbchost" database="db1" />
        <dataNode       name="jdbc_dn2" dataHost="jdbchost" database="db2" />
        <dataNode name="jdbc_dn3"       dataHost="jdbchost" database="db3" /> -->
        <dataHost name="remoteHost" maxCon="1000" minCon="10" balance="0"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
                <heartbeat>select user()</heartbeat>
                <!-- can have multi write hosts -->
                <!-- <writeHost host="hostM1" url="localhost:3306" user="root"
                                   password="Ks992102!!!"> -->
                        <!-- can have multi read hosts -->
                        <!-- <readHost host="hostS2" url="192.168.1.200:3306" user="root" password="xxx" /> -->
                <!-- </writeHost> -->
                <writeHost host="hostS1" url="云服务器ip:3306" user="root"
                                   password="云服务器密码" />
                <!-- <writeHost host="hostM2" url="localhost:3316" user="root" password="123456"/> -->
        </dataHost>
        <dataHost name="local-mac" maxCon="1000" minCon="10" balance="0"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
                <heartbeat>select user()</heartbeat>
                <!-- can have multi write hosts -->
                <!-- <writeHost host="hostM1" url="localhost:3306" user="root"
                                   password="Ks992102!!!"> -->
                        <!-- can have multi read hosts -->
                        <!-- <readHost host="hostS2" url="192.168.1.200:3306" user="root" password="xxx" /> -->
                <!-- </writeHost> -->
                <writeHost host="hostS1" url="192.168.31.228:3306" user="root"
                                   password="123456" />
                <!-- <writeHost host="hostM2" url="localhost:3316" user="root" password="123456"/> -->
        </dataHost>
        <!--
                <dataHost name="sequoiadb1" maxCon="1000" minCon="1" balance="0" dbType="sequoiadb" dbDriver="jdbc">
                <heartbeat>             </heartbeat>
                 <writeHost host="hostM1" url="sequoiadb://1426587161.dbaas.sequoialab.net:11920/SAMPLE" user="jifeng"  password="jifeng"></writeHost>
                 </dataHost>

          <dataHost name="oracle1" maxCon="1000" minCon="1" balance="0" writeType="0"   dbType="oracle" dbDriver="jdbc"> <heartbeat>select 1 from dual</heartbeat>
                <connectionInitSql>alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss'</connectionInitSql>
                <writeHost host="hostM1" url="jdbc:oracle:thin:@127.0.0.1:1521:nange" user="base"       password="123456" > </writeHost> </dataHost>

                <dataHost name="jdbchost" maxCon="1000"         minCon="1" balance="0" writeType="0" dbType="mongodb" dbDriver="jdbc">
                <heartbeat>select       user()</heartbeat>
                <writeHost host="hostM" url="mongodb://192.168.0.99/test" user="admin" password="123456" ></writeHost> </dataHost>

                <dataHost name="sparksql" maxCon="1000" minCon="1" balance="0" dbType="spark" dbDriver="jdbc">
                <heartbeat> </heartbeat>
                 <writeHost host="hostM1" url="jdbc:hive2://feng01:10000" user="jifeng"         password="jifeng"></writeHost> </dataHost> -->

        <!-- <dataHost name="jdbchost" maxCon="1000" minCon="10" balance="0" dbType="mysql"
                dbDriver="jdbc"> <heartbeat>select user()</heartbeat> <writeHost host="hostM1"
                url="jdbc:mysql://localhost:3306" user="root" password="123456"> </writeHost>
                </dataHost> -->
</mycat:schema>

<schema name="testdb" checkSQLschema="true" sqlMaxLimit="100"> 中checkSQLschema需要设置为true，否则老报# find no Route

<table name="goods" primaryKey="id" dataNode="dn1,dn2" rule="mod-long"/> 这个就是你要进行分库分表的表，按照mod-long的规则分，详见rule.xml remoteHost是云服务的 local-mac 就是本地Mac

rule.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License"); 
        - you may not use this file except in compliance with the License. - You 
        may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 
        - - Unless required by applicable law or agreed to in writing, software - 
        distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT 
        WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the 
        License for the specific language governing permissions and - limitations 
        under the License. -->
<!DOCTYPE mycat:rule SYSTEM "rule.dtd">
<mycat:rule xmlns:mycat="http://io.mycat/">
        <tableRule name="rule1">
                <rule>
                        <columns>id</columns>
                        <algorithm>func1</algorithm>
                </rule>
        </tableRule>

        <tableRule name="rule2">
                <rule>
                        <columns>user_id</columns>
                        <algorithm>func1</algorithm>
                </rule>
        </tableRule>

        <tableRule name="sharding-by-intfile">
                <rule>
                        <columns>sharding_id</columns>
                        <algorithm>hash-int</algorithm>
                </rule>
        </tableRule>
        <tableRule name="auto-sharding-long">
                <rule>
                        <columns>id</columns>
                        <algorithm>rang-long</algorithm>
                </rule>
        </tableRule>
        <tableRule name="mod-long">
                <rule>
                        <columns>id</columns>
                        <algorithm>mod-long</algorithm>
                </rule>
        </tableRule>
        <tableRule name="sharding-by-murmur">
                <rule>
                        <columns>id</columns>
                        <algorithm>murmur</algorithm>
                </rule>
        </tableRule>
        <tableRule name="crc32slot">
                <rule>
                        <columns>id</columns>
                        <algorithm>crc32slot</algorithm>
                </rule>
        </tableRule>
        <tableRule name="sharding-by-month">
                <rule>
                        <columns>create_time</columns>
                        <algorithm>partbymonth</algorithm>
                </rule>
        </tableRule>
        <tableRule name="latest-month-calldate">
                <rule>
                        <columns>calldate</columns>
                        <algorithm>latestMonth</algorithm>
                </rule>
        </tableRule>
        
        <tableRule name="auto-sharding-rang-mod">
                <rule>
                        <columns>id</columns>
                        <algorithm>rang-mod</algorithm>
                </rule>
        </tableRule>
        
        <tableRule name="jch">
                <rule>
                        <columns>id</columns>
                        <algorithm>jump-consistent-hash</algorithm>
                </rule>
        </tableRule>

        <function name="murmur"
                class="io.mycat.route.function.PartitionByMurmurHash">
                <property name="seed">0</property><!-- 默认是0 -->
                <property name="count">2</property><!-- 要分片的数据库节点数量，必须指定，否则没法分片 -->
                <property name="virtualBucketTimes">160</property><!-- 一个实际的数据库节点被映射为这么多虚拟节点，默认是160倍，也就是虚拟节点数是物理节点数的160倍 -->
                <!-- <property name="weightMapFile">weightMapFile</property> 节点的权重，没有指定权重的节点默认是1。以properties文件的格式填写，以从0开始到count-1的整数值也就是节点索引为key，以节点权重值为值。所有权重值必须是正整数，否则以1代替 -->
                <!-- <property name="bucketMapPath">/etc/mycat/bucketMapPath</property> 
                        用于测试时观察各物理节点与虚拟节点的分布情况，如果指定了这个属性，会把虚拟节点的murmur hash值与物理节点的映射按行输出到这个文件，没有默认值，如果不指定，就不会输出任何东西 -->
        </function>

        <function name="crc32slot"
                          class="io.mycat.route.function.PartitionByCRC32PreSlot">
                <property name="count">2</property><!-- 要分片的数据库节点数量，必须指定，否则没法分片 -->
        </function>
        <function name="hash-int"
                class="io.mycat.route.function.PartitionByFileMap">
                <property name="mapFile">partition-hash-int.txt</property>
        </function>
        <function name="rang-long"
                class="io.mycat.route.function.AutoPartitionByLong">
                <property name="mapFile">autopartition-long.txt</property>
        </function>
        <function name="mod-long" class="io.mycat.route.function.PartitionByMod">
                <!-- how many data nodes -->
                <property name="count">2</property>
        </function>

        <function name="func1" class="io.mycat.route.function.PartitionByLong">
                <property name="partitionCount">8</property>
                <property name="partitionLength">128</property>
        </function>
        <function name="latestMonth"
                class="io.mycat.route.function.LatestMonthPartion">
                <property name="splitOneDay">24</property>
        </function>
        <function name="partbymonth"
                class="io.mycat.route.function.PartitionByMonth">
                <property name="dateFormat">yyyy-MM-dd</property>
                <property name="sBeginDate">2015-01-01</property>
        </function>
        
        <function name="rang-mod" class="io.mycat.route.function.PartitionByRangeMod">
                <property name="mapFile">partition-range-mod.txt</property>
        </function>
        
        <function name="jump-consistent-hash" class="io.mycat.route.function.PartitionByJumpConsistentHash">
                <property name="totalBuckets">3</property>
        </function>
</mycat:rule>

因为配置了两台，所以

<function name="mod-long" class="io.mycat.route.function.PartitionByMod">
                <!-- how many data nodes -->
                <property name="count">2</property>
</function>

中<property name="count">2</property>为2

3.效果

4.注意的问题

• 配置文件注意xml的标签，不能写错，少些，漏写，否则启动报错
• 两台mysql都要开启远程访问，否则会连不上，具体可以看日志 mycat的安装目录下 mycat/logs/wrapper.log

来源：oschina

链接：https://my.oschina.net/hensemlee/blog/3173801