Windows环境Mycat数据库分库分表中间件部署

Laila ·
更新时间:2024-11-14
· 519 次阅读

  下载地址MYCAT官方网站 jdk安装配置 首先去oracle官网下载并安装jdk8,添加环境变量,JAVA_HOME设置为D:WorksoftwareJavajdk1.8 CLASSPATH设置为.;%JAVA_HOME%lib;%JAVA_HOME%lib ools.jar path系统变量追加%JAVA_HOME%in; Mycat安装配置   首先添加Windows环境变量,MYCAT_HOME设置为安装目录E:WorkSoftWareMycatServer1.5   为了降低资源占用,mycat的jvm设置在startup_nowrap.bat,打开后可以清楚看到如下配置:   “%JAVA_CMD%” -server -Xms1G -Xmx2G -XX:MaxPermSize=64M -XX:+AggressiveOpts -XX:MaxDirectMemorySize=1G -DMYCAT_HOME=%MYCAT_HOME% -cp “..conf;..lib*” io.mycat.MycatStartup   这里将-Xms1G改成-Xms512M,-Xmx2G改成-Xmx1024M,保存后重新启动即可.   wrapper.conf文件里的改成wrapper.java.command=E:WorkSoftWarejdk1.8injava.exe Mycat启动的配置 schema.xml配置文件,如果分库在不同的服务器,可以配置两个datahost;如果在一个datahost中配置多个writeHost,则为主从配置。type=”global”时,为全局表   <?xml version="1.0"?>   <!DOCTYPE mycat:schema SYSTEM "schema.dtd">   <mycat:schema xmlns:mycat="http://org.opencloudb/" >   <!--在这一行参数里面,schema name定义了可以在MyCAT前端显示的逻辑数据库的名字,checkSQLschema这个参数为False的时候,表明MyCAT会自动忽略掉表名前的数据库名,比如说mydatabase1.test1,会被当做test1;sqlMaxLimit指定了SQL语句返回的行数限制-->   <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100">   <!-- 主键范围规则 -->   <!-- 这一行代表在MyCAT前端会显示哪些表名,类似几行都代表一样的意思,这里强调的是表,而MyCAT并不会在配置文件里面定义表结构,如果在前端使用show create table ,MyCAT会显示正常的表结构信息,观察Debug日志,可以看到,MyCAT把命令分发给了dn1代表的数据库,然后把dn1的查询结果返回给了前端 可以判断,类似的数据库级别的一些查询指令,有可能是单独分发给某个节点,然后再把某个节点的信息返回给前端。   dataNode的意义很简单,这个逻辑表的数据存储在后端的哪几个数据库里面rule代表的是这个逻辑表students的具体切分策略,目前MyCAT只支持按照某一个特殊列,遵循一些特殊的规则来切分,如取模,枚举等,具体的留给之后细说                    -->   <table name="travelrecord" dataNode="dn1,dn2,dn3" rule="auto-sharding-long" />   <table name="company" primaryKey="ID" dataNode="dn3,dn2,dn1" rule="mod-long"/>   <table name="goods" primaryKey="ID" type="global" dataNode="dn1,dn2" />   <!--求模分片随机规则 -->   <table name="hotnews" primaryKey="ID" dataNode="dn1,dn2,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我在测试中并没有实际用起来不过在MyCAT的设计文档里面有提到,childtable是一种依赖于父表的结构,   这意味着,childtable的joinkey会按照父表的parentKey的策略一起切分,当父表与子表进行连接,   且连接条件是childtable.joinKey=parenttable.parentKey时,不会进行跨库的连接.   -->   <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>   <!-- 全局表是自动克隆到所有定义的数据节点,这样可以与拆分节点的任何表连接查询,是在同一个数据节点-->   <table name="news_table" primaryKey="ID" type="global" dataNode="dn1,dn2,dn3" />   </schema>   <dataNode name="dn1" dataHost="localhost1" database="mycatDB1" />   <dataNode name="dn2" dataHost="localhost1" database="mycatDB2" />   <dataNode name="dn3" dataHost="localhost1" database="mycatDB3" />   <!--   dataHost配置的是实际的后端数据库集群,大部分参数简单易懂,这里不一个个介绍了,只介绍比较重要的两个参数,writeType和balance.   -->   <!-- writeType和balance是用来控制后端集群的读写分离的关键参数,这里我用了双主双从的集群配置   这里的测试过程比较麻烦,所以直接贴结论:   1.balance=0时,读操作都在localhost上(localhost失败时,后端直接失败)   2.balance=1时,读操作会随机分散在localhost1和两个readhost上面(localhost失败时,写操作会在localhost1,如果localhost1再失败,则无法进行写操作)   3.balance=2时,写操作会在localhost上,读操作会随机分散在localhost1,localhost1和两个readhost上面(同上)   4.writeType=0时,写操作会在localhost上,如果localhost失败,会自动切换到localhost1,localhost恢复以后并不会切换回localhost进行写操作   5.writeType=1时,写操作会随机分布在localhost和localhost1上,单点失败并不会影响集群的写操作,但是后端的从库会无法从挂掉的主库获取更新,会在读数据的时候出现数据不一致   举例:localhost失败了,写操作会在localhost1上面进行,localhost1的主从正常运行,但是localhost的从库无法从localhost获取更新,localhost的从库于其他库出现数据不一致   -->   <dataHost name="localhost1" 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="123456">   <!-- can have multi read hosts -->   <!--<readHost host="hostS2" url="192.168.1.200:3306" user="root" password="xxx" />-->   </writeHost>   </dataHost>   </mycat:schema>   server.xml配置文件   <?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://org.opencloudb/">   <system>   <property name="defaultSqlParser">druidparser</property>   <!--  <property name="useCompression">1</property>--> <!--1为开启mysql压缩协议-->   <!-- <property name="processorBufferChunk">40960</property> -->   <!--   <property name="processors">1</property>   <property name="processorExecutor">32</property>   -->   <!--默认是65535 64K 用于sql解析时大文本长度 -->   <!--<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="mutiNodeLimitType">1</property> 0:开启小数量级(默认) ;1:开启亿级数据排序   <property name="mutiNodePatchSize">100</property> 亿级数量排序批量   <property name="processors">32</property> <property name="processorExecutor">32</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> -->   </system>   <user name="test"><!--用户名-->   <property name="password">test</property><!--密码-->   <!--实例名,和schema.xml定义的schema对应,这里的实例名是虚拟名,也是对mycat服务的一种别名,是应用程序以及客户端连接的入口。-->   <property name="schemas">TESTDB</property>   </user>   <user name="user">   <property name="password">user</property>   <property name="schemas">TESTDB</property>   <property name="readOnly">true</property>   </user>   <!--   <quarantine>   <whitehost>   <host host="127.0.0.1" user="mycat"/>   <host host="127.0.0.2" user="mycat"/>   </whitehost>   <blacklist check="false"></blacklist>   </quarantine>   -->   </mycat:server>   rule.xml配置文件   <?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://org.opencloudb/">   <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="sharding-by-month">   <rule>   <columns>create_date</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="org.opencloudb.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,不会输出任何东西 -->   </function>   <function name="hash-int"   class="org.opencloudb.route.function.PartitionByFileMap">   <property name="mapFile">partition-hash-int.txt</property>   </function>   <function name="rang-long"   class="org.opencloudb.route.function.AutoPartitionByLong">   <property name="mapFile">autopartition-long.txt</property>   </function>   <function name="mod-long" class="org.opencloudb.route.function.PartitionByMod">   <!-- how many data nodes -->   <property name="count">3</property>   </function>   <function name="func1" class="org.opencloudb.route.function.PartitionByLong">   <property name="partitionCount">8</property>   <property name="partitionLength">128</property>   </function>   <function name="latestMonth"   class="org.opencloudb.route.function.LatestMonthPartion">   <property name="splitOneDay">24</property>   </function>   <function name="partbymonth"   class="org.opencloudb.route.function.PartitionByMonth">   <property name="dateFormat">yyyy-MM-dd</property>   <property name="sBeginDate">2015-01-01</property>   </function>   <function name="rang-mod" class="org.opencloudb.route.function.PartitionByRangeMod">   <property name="mapFile">partition-range-mod.txt</property>   </function>   <function name="jump-consistent-hash" class="org.opencloudb.route.function.PartitionByJumpConsistentHash">   <property name="totalBuckets">3</property>   </function>   </mycat:rule>   Mycat连接mysql示例   cmd命令运行:

  结果:

  Mycat连接mysql结果

  上图上面的mycatdb1,mycatdb2,mycatdb3数据库是真实物理数据库,TESTDB是中间件逻辑数据库,此时已经所有工作都准备好。   以上是Windows环境Mycat数据库分库分表中间件部署的全文介绍,希望对您学习和使用数据库有所帮助.



中间件 mycat windows

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