【Mycat】Mycat核心开发者带你轻松掌握Mycat路由转发！！

秒速五厘米 2021-09-02 05:47 302阅读 0赞

## 写在前面 ##

> 熟悉Mycat的小伙伴都知道，Mycat一个很重要的功能就是路由转发，那么，这篇文章就带着大家一起来看看Mycat是如何进行路由转发的，好了，不多说了，我们直接进入主题。

## 环境准备 ##

### 软件版本 ###

操作系统：CentOS-6.8

JDK版本：jdk1.8

Mycat版本：Mycat-server-1.6

MySQL：5.7

注意：这里，我将Mycat和MySQL安装在同一台虚拟机(IP：192.168.209.140 主机名为:binghe140)，大家也可以将Mycat和MySQL安装到不同的主机上，测试效果是一样的。

### 创建物理库 ###

mysql -uroot -proot -h192.168.209.140 -P3306
    
    drop database if exists db1;
    create database db1;
    drop database if exists db2;
    create database db2;
    drop database if exists db3;
    create database db3;

## 配置Mycat ##

### schema.xml配置 ###

<?xml version="1.0"?>
    <!DOCTYPE mycat:schema SYSTEM "schema.dtd">
    <mycat:schema xmlns:mycat="http://org.opencloudb/" >
     
    	<schema name="binghe" checkSQLschema="false" sqlMaxLimit="100">
    		<table name="travelrecord" dataNode="dn1,dn2,dn3" rule="auto-sharding-long"></table>
    	</schema>
    	
    	<dataNode name="dn1" dataHost="localhost1" database="db1" />
    	<dataNode name="dn2" dataHost="localhost1" database="db2" />
    	<dataNode name="dn3" dataHost="localhost1" database="db3" />
    	
    	<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="hostM1" url="127.0.0.1:3306" user="root" password="root"></writeHost>
    		
    		<writeHost host="hostM2" url="127.0.0.1:3306" user="root" password="root"></writeHost>
    		
    			
    		
    	</dataHost>
    </mycat:schema>

### server.xml配置 ###

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE mycat:server SYSTEM "server.dtd">
    <mycat:server xmlns:mycat="http://org.opencloudb/">
    	<system>
    	<property name="defaultSqlParser">druidparser</property>
    	</system>
    	<user name="binghe">
    		<property name="password">binghe.123</property>
    		<property name="schemas">binghe</property>
    	</user>
    	<user name="test">
    		<property name="password">test</property>
    		<property name="schemas">binghe</property>
    		<property name="readOnly">true</property>
    	</user>
    </mycat:server>

### rule.xml配置 ###

<?xml version="1.0" encoding="UTF-8"?>
    <!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>
    		<property name="count">2</property>
    		<property name="virtualBucketTimes">160</property>
    	</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">
    		
    		<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">2020-01-01</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>

## 登录Mycat ##

### 登录Mycat ###

命令行输入以下命令登录Mycat

D:\>mysql -ubinghe -pbinghe.123 -h192.168.209.140 -P8066
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 2
    Server version: 5.5.8-mycat-1.6.1-RELEASE-20170807215126 MyCat Server (OpenCloundDB)
     
    Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
     
    Oracle is a registered trademark of Oracle Corporation and/or its
    affiliates. Other names may be trademarks of their respective
    owners.
     
    Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
     
    mysql>

## 创建表测试 ##

输入以下命令查看创建表的路由

create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int);

结果如下：

mysql> explain create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int);
    +-----------+-----------------------------------------------------------------------------------------------------------------------+
    | DATA_NODE | SQL                                                                                                                   |
    +-----------+-----------------------------------------------------------------------------------------------------------------------+
    | dn1       | create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int) |
    | dn2       | create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int) |
    | dn3       | create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int) |
    +-----------+-----------------------------------------------------------------------------------------------------------------------+
    3 rows in set (0.00 sec)
     
    mysql>

说明创建表的SQL语句被Mycat路由到dn1,dn2,dn3三个节点上，也就是说在3个节点上都执行了创建表的SQL。

我们输入建表语句：

mysql> create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int);
    Query OK, 0 rows affected (0.18 sec)

此时，将会在dn1,dn2,dn3三个节点上创建travelrecord表。

## 录入数据测试 ##

**录入到dn1节点**

我们在命令行输入如下SQL语句

explain insert into travelrecord (id,user_id,traveldate,fee,days) values(100001,'binghe','2020-11-10',510.5,3);

结果如下：

mysql> explain insert into travelrecord (id,user_id,traveldate,fee,days) values(100001,'binghe','2020-11-10',510.5,3);
    +-----------+-------------------------------------------------------------------------------------------------------------+
    | DATA_NODE | SQL                                                                                                         |
    +-----------+-------------------------------------------------------------------------------------------------------------+
    | dn1       | insert into travelrecord (id,user_id,traveldate,fee,days) values(100001,'binghe','2020-11-10',510.5,3) |
    +-----------+-------------------------------------------------------------------------------------------------------------+
    1 row in set (0.00 sec)

说明Mycat将SQL路由到了dn1节点。

我们执行插入语句：

mysql> insert into travelrecord (id,user_id,traveldate,fee,days) values(100001,'binghe','2020-11-10',510.5,3);
    Query OK, 1 row affected, 1 warning (0.01 sec)
     
    mysql>

**录入到dn2节点**

我们在命令行输入如下语句：

explain insert into travelrecord (id,user_id,traveldate,fee,days) values(8000004,'binghe','2020-11-10',510.5,3);

结果如下：

mysql> explain insert into travelrecord (id,user_id,traveldate,fee,days) values(8000004,'binghe','2020-11-10',510.5,3);
    +-----------+--------------------------------------------------------------------------------------------------------------+
    | DATA_NODE | SQL                                                                                                          |
    +-----------+--------------------------------------------------------------------------------------------------------------+
    | dn2       | insert into travelrecord (id,user_id,traveldate,fee,days) values(8000004,'binghe','2020-11-10',510.5,3) |
    +-----------+--------------------------------------------------------------------------------------------------------------+
    1 row in set (0.00 sec)

说明Mycat将SQL路由到了dn2节点，我们执行插入语句：

mysql> insert into travelrecord (id,user_id,traveldate,fee,days) values(8000004,'binghe','2020-11-10',510.5,3);
    Query OK, 1 row affected, 1 warning (0.06 sec)

**路由到dn3节点**

我们在命令行输入如下语句

explain insert into travelrecord (id,user_id,traveldate,fee,days) values(10000004,'binghe','2020-11-10',510.5,3);

结果为：

mysql> explain insert into travelrecord (id,user_id,traveldate,fee,days) values(10000004,'binghe','2020-11-10',510.5,3);
    +-----------+---------------------------------------------------------------------------------------------------------------+
    | DATA_NODE | SQL                                                                                                           |
    +-----------+---------------------------------------------------------------------------------------------------------------+
    | dn3       | insert into travelrecord (id,user_id,traveldate,fee,days) values(10000004,'binghe','2020-11-10',510.5,3) |
    +-----------+---------------------------------------------------------------------------------------------------------------+
    1 row in set (0.00 sec)

说明Mycat将SQL路由到了dn3节点，我们同样执行插入语句的操作

mysql>  insert into travelrecord (id,user_id,traveldate,fee,days) values(10000004,'binghe','2020-11-10',510.5,3);
    Query OK, 1 row affected, 1 warning (0.01 sec)

## 查询测试 ##

### 查询所有数据 ###

在命令行执行如下语句：

explain select * from travelrecord;

结果为：

mysql> explain select * from travelrecord;
    +-----------+--------------------------------------+
    | DATA_NODE | SQL                                  |
    +-----------+--------------------------------------+
    | dn1       | SELECT * FROM travelrecord LIMIT 100 |
    | dn2       | SELECT * FROM travelrecord LIMIT 100 |
    | dn3       | SELECT * FROM travelrecord LIMIT 100 |
    +-----------+--------------------------------------+
    3 rows in set (0.01 sec)

说明查询所有的数据，Mycat是将SQL语句路由到了所有的数据分片，即dn1,dn2,dn3节点上。

### 根据id查询指定数据 ###

我们分别在命令行中执行如下SQL:

explain select * from travelrecord where id = 1000004;
    explain select * from travelrecord where id = 8000004;
    explain select * from travelrecord where id = 10000004;

得到的结果依次如下：

mysql> explain select * from travelrecord where id = 1000004;
    +-----------+---------------------------------------------------------+
    | DATA_NODE | SQL                                                     |
    +-----------+---------------------------------------------------------+
    | dn1       | SELECT * FROM travelrecord WHERE id = 1000004 LIMIT 100 |
    +-----------+---------------------------------------------------------+
    1 row in set (0.06 sec)
     
    mysql> explain select * from travelrecord where id = 8000004;
    +-----------+---------------------------------------------------------+
    | DATA_NODE | SQL                                                     |
    +-----------+---------------------------------------------------------+
    | dn2       | SELECT * FROM travelrecord WHERE id = 8000004 LIMIT 100 |
    +-----------+---------------------------------------------------------+
    1 row in set (0.00 sec)
     
    mysql> explain select * from travelrecord where id = 10000004;
    +-----------+----------------------------------------------------------+
    | DATA_NODE | SQL                                                      |
    +-----------+----------------------------------------------------------+
    | dn3       | SELECT * FROM travelrecord WHERE id = 10000004 LIMIT 100 |
    +-----------+----------------------------------------------------------+
    1 row in set (0.00 sec)

说明：按照分片字段查询，Mycat只会将SQL路由到指定的数据分片。

## 删表测试 ##

在命令行输入如下SQL：

explain drop table travelrecord;

结果如下

mysql> explain drop table travelrecord;
    +-----------+-------------------------+
    | DATA_NODE | SQL                     |
    +-----------+-------------------------+
    | dn1       | drop table travelrecord |
    | dn2       | drop table travelrecord |
    | dn3       | drop table travelrecord |
    +-----------+-------------------------+
    3 rows in set (0.00 sec)

有结果可知，删表操作和创建表操作一样，Mycat在本实例中都会将SQL路由到所有的数据分片。

**注意：本文的Mycat路由结果针对本文的配置实例，其他配置下，Mycat的路由结果可能会有不同。**

**好了，我们今天就到这儿吧，我是冰河，我们下期见~~**