一、简介
Mycat是一个彻底开源的,面向企业应用开发的大数据库集群中间件,本身带有非常复杂成熟的功能,完成数据库的集群,实现业务数据的分库分表。
本次文章介分享的mycat的单库分表实际应用,包括在实际应用时所要注意的事项。
二、下载mycat及环境要求
在官网下载按照包:http://www.mycat.org.cn/
安装注意事项:1.单库分表是要求mycat版本在1.6.5以上(我原本用的是1.6.0版本,配置之后就是一直报错:please
make sure table datanode size = function partition size,也是找了好久分找到原因)
2.mycat的启动是要求在java环境下进行的,所以的需要先安装java jdk,建议是使用1.8以上的版本
三、修改配置
1.修改server.xml
在conf文件夹下server.xml简单理解就是配置暴露给用户使用相关配置,比如登录用户、数据库、密码等
本次主要修改的是的(1)user标签,配置了数据库名称为TSL和用户密码
(2)<property name="sequnceHandlerType">1</property> 这个主要使用的mycat的调用数据库表进行主键自增
<?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> <property name="useSqlStat">0</property> <!-- 1为开启实时统计、0为关闭 --> <property name="useGlobleTableCheck">0</property> <!-- 1为开启全加班一致性检测、0为关闭 --> <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>--> <!-- 配置序列自增的 --> <property name="sequnceHandlerType">1</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> </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">TSL</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">TSL</property> <property name="readOnly">true</property> </user> </mycat:server>
注意事项:配置user中的schema是必须是大写的
(2)schema.xml
在conf文件夹下schema.xml主要配置使用底层数据库连接和处理逻辑,分表也就是在这里配置
这里配置的单库本地的tsl数据库,对employee表进行分表分表处理,处理方式根据主键取模的方式进行处理,也就是用 rule = "mod-long"
<?xml version="1.0"?> <!DOCTYPE mycat:schema SYSTEM "schema.dtd"> <mycat:schema xmlns:mycat="http://io.mycat/"> <schema name="TSL" checkSQLschema="true" sqlMaxLimit="100" dataNode="dn1"> <table name="employee" primaryKey="id" autoIncrement="true" dataNode="dn1" subTables="employee$1-3" rule = "mod-long" ></table> <table name="mycat_sequence" primaryKey="name" dataNode="dn1"></table> </schema> <dataNode name="dn1" dataHost="localhost1" database="tsl" /> <dataHost name="localhost1" maxCon="1000" minCon="10" balance="0" writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100"> <heartbeat>select user()</heartbeat> <writeHost host="host1" url="10.56.174.234:3306" user="lll" password="123456"></writeHost> </dataHost> </mycat:schema>
注意事项:(1)所配置分片表必须在自己底层的数据库中先建好,mycat不支持自动建表
(2)其中的 checkSQLschema属性为true时是执行sql不带schema,false时是带上schema进行查询
(3)rule.xml
在conf文件夹下rule.xml主要配置分表逻辑,这里主要是修改mod-long函数,要求取模数和schema中一致
<?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">7</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">3</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>
四、启动服务
在配置都修改好之后,就可以启动服务
#控制台启动 ./mycat console #后台启动 ./mycat start
启动成功会有successful提示
在客户端进行连接(默认端口是8066)
employee表在底层被分为了三个表,主表的数据也按照规则被分到三张表中,业务层直接处理主表employee即可。
在实际的底层数据的显示的employee表实际为空,并没有数据
五、程序连接注意事项
1.mycat1.6.5所暴露出来的数据版本为5.0.X(可通过select version()进行查询),程序连接驱动也须要对应降低(我用的5.1.8可用)
2.mycat像mysql一直支持id自增,所以需要单独配置,或者在程序中自行解决,配置参考:https://www.bbsmax.com/A/n2d9VjlBzD/
标签:--,配置,单库,mycat,分表,节点,id From: https://www.cnblogs.com/LiLiliang/p/17329283.html