基于Docker搭建MySQL（MariaDB）+ mycat读写分离测试环境，dockermycat
1. 手动创建mariadb镜像创建一个CentOS容器
[yeqiang@localhost ~]$ docker run -it centos /bin/bash
在容器中安装mariadb
[root@8195a2bac40d /]# yum install mariadb mariadb-server -y
编辑/etc/passwd允许mysql账户运行指令(方便)
修改
mysql:x:27:27:MariaDB Server:/var/lib/mysql:/sbin/nologin
为
mysql:x:27:27:MariaDB Server:/var/lib/mysql:/bin/bash
初始化数据库结构
[root@8195a2bac40d /]# su -c mysql_install_db mysql
测试数据库
[root@8195a2bac40d /]# su -c mysqld_safe mysql &
[1] 109
[root@8195a2bac40d /]# 171226 06:11:00 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
171226 06:11:00 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
[root@8195a2bac40d /]# mysql -uroot
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 1
Server version: 5.5.56-MariaDB MariaDB Server
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
为新安装的数据库root设置一个密码
MariaDB [(none)]> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
MariaDB [mysql]> update user set password=password('hkNaruto');
Query OK, 6 rows affected (0.00 sec)
Rows matched: 6 Changed: 6 Warnings: 0
MariaDB [mysql]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
允许任意地址以root访问mysql（仅仅为了方便，线上禁止此操作！）
MariaDB [mysql]> grant all privileges on *.* to root@'%' identified by 'hkNaruto';
Query OK, 0 rows affected (0.00 sec)
MariaDB [mysql]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
MariaDB [mysql]>
清理垃圾
[root@8195a2bac40d /]# yum clean all
Loaded plugins: fastestmirror
Cleaning repos: base extras updates
Cleaning up everything
Cleaning up list of fastest mirrors
退出容器并提交到mairadb镜像
[root@8195a2bac40d /]# exit
[yeqiang@localhost ~]$ docker commit 8195 mariadb
5d815e5ee022b8167dbed912c84e72bf5b24e9f4ab3430f1a4432f93aa61d582
2. 启动两个mariadb实力，做主从
启动master实例
[yeqiang@localhost ~]$ docker run -it --name=mariadb-master mariadb /bin/bash
[root@043b24e25726 /]
编辑/etc/my.cnf，设置server-id并打开二进制日志
[root@043b24e25726 /]# vi /etc/my.cnf
[mysqld]
server-id=1
log-bin=bin
启动mariadb
[root@043b24e25726 /]# su -c mysqld_safe mysql &
连接到本地实例并创建复制账号
[root@043b24e25726 /]# mysql -uroot -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 5
Server version: 5.5.56-MariaDB MariaDB Server
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> grant replication slave,reload,super on *.* to backup@'%' identified by 'backup';
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show master status;
+------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------+----------+--------------+------------------+
| bin.000001 | 682 | | |
+------------+----------+--------------+------------------+
1 row in set (0.00 sec)
MariaDB [(none)]>
启动slave实例
[yeqiang@localhost ~]$ docker run -it --name=mariadb-slave --link=mariadb-master mariadb /bin/bash
[root@f49bb64cd788 /]#
编辑/etc/my.cnf，设置server-id、打开relay日志、设置只读
[root@043b24e25726 /]# vi /etc/my.cnf
[mysqld]
server-id=2
relay_log=relay
read_only=1
启动mariadb
[root@043b24e25726 /]# su -c mysqld_safe mysql &
连接到本地实例并启动slave
[root@f49bb64cd788 /]# mysql -uroot -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 3
Server version: 5.5.56-MariaDB MariaDB Server
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> change master to master_host='mariadb-master',master_user='backup',master_password='backup',master_log_file='bin.000001',master_log_pos=0;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: mariadb-master
Master_User: backup
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: bin.000001
Read_Master_Log_Pos: 682
Relay_Log_File: relay.000002
Relay_Log_Pos: 960
Relay_Master_Log_File: bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 682
Relay_Log_Space: 1244
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
1 row in set (0.00 sec)
MariaDB [(none)]>
3. 测试主从同步
在主服务器创建一个测试数据库
[root@043b24e25726 /]# mysql -uroot -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 4
Server version: 5.5.56-MariaDB MariaDB Server
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
MariaDB [(none)]> create database testdb;
Query OK, 1 row affected (0.00 sec)
MariaDB [testdb]> create table tt ( id int not null primary key auto_increment, c1 varchar(32) null ) engine=Innodb default charset=utf8;
Query OK, 0 rows affected (0.00 sec)
MariaDB [testdb]> insert into tt (c1)values('ttttt');
Query OK, 1 row affected (0.00 sec)
MariaDB [testdb]> select * from tt;
+----+-------+
| id | c1 |
+----+-------+
| 1 | ttttt |
+----+-------+
1 row in set (0.00 sec)
MariaDB [testdb]>
登录从服务器，查看数据库
[root@f49bb64cd788 /]# mysql -uroot -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 5
Server version: 5.5.56-MariaDB MariaDB Server
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
| testdb |
+--------------------+
5 rows in set (0.00 sec)
MariaDB [(none)]> use testdb;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
MariaDB [testdb]> select * from tt;
+----+-------+
| id | c1 |
+----+-------+
| 1 | ttttt |
+----+-------+
1 row in set (0.00 sec)
MariaDB [testdb]>
4. 手动创建一个mycat容器，测试读写分离
[yeqiang@localhost ~]$ docker run -it -p 8066:8066 -p 9066:9066 --link=mariadb-master --link=mariadb-slave centos /bin/bash
[root@28188b8937da /]# yum install java -y
[root@28188b8937da /]# curl -O http://dl.mycat.io/1.6-RELEASE/Mycat-server-1.6-RELEASE-20161028204710-linux.tar.gz
[root@28188b8937da /]# tar -xvf Mycat-server-1.6-RELEASE-20161028204710-linux.tar.gz
配置mycat读写分离，一个writeHost，一个ReadHost，balance=3
[root@28188b8937da /]# vi mycat/conf/schema.xml
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<schema name="TESTDB1" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1">
</schema>
<dataNode name="dn1" dataHost="dh1" database="testdb" />
<dataHost name="dh1" maxCon="1000" minCon="10" balance="3"
writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<!-- can have multi write hosts -->
<writeHost host="hostM1" url="mariadb-master:3306" user="root"
password="hkNaruto">
<!-- can have multi read hosts -->
<readHost host="hostS1" url="mariadb-slave:3306" user="root" password="hkNaruto" />
</writeHost>
</dataHost>
</mycat:schema>
配置访问mycat的用户名，密码及对应db（TESTDB1对应后端mysql的testdb）
[root@28188b8937da /]# vi mycat/conf/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>
<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>
<!--默认为type 0: DirectByteBufferPool | type 1 ByteBufferArena-->
<property name="processorBufferPoolType">0</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>
<user name="root">
<property name="password">123456</property>
<property name="schemas">TESTDB1</property>
</user>
</mycat:server>
配置日志级别为debug（为观察读写分离细节，生产环境应当调整到info以上级别）
[root@28188b8937da /]# vi mycat/conf/log4j2.xml
<asyncRoot level="debug" includeLocation="true">
<AppenderRef ref="Console" />
<AppenderRef ref="RollingFile"/>
</asyncRoot>
启动mycat
[root@28188b8937da /]# /mycat/bin/mycat console
Running Mycat-server...
略。。。
jvm 1 | 2017-12-26 08:03:28,586 [DEBUG][Timer0] con query sql:select user() to con:MySQLConnection [id=8, lastTime=1514275408586, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=false, threadId=42, charset=latin1, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=mariadb-master, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] (io.mycat.sqlengine.SQLJob:SQLJob.java:88)
jvm 1 | 2017-12-26 08:03:28,587 [DEBUG][Timer0] con query sql:select user() to con:MySQLConnection [id=14, lastTime=1514275408587, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=true, threadId=32, charset=latin1, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=mariadb-slave, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] (io.mycat.sqlengine.SQLJob:SQLJob.java:88)
jvm 1 | 2017-12-26 08:03:28,587 [DEBUG][$_NIOREACTOR-0-RW] release channel MySQLConnection [id=8, lastTime=1514275408586, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=false, threadId=42, charset=latin1, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=mariadb-master, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] (io.mycat.backend.datasource.PhysicalDatasource:PhysicalDatasource.java:442)
jvm 1 | 2017-12-26 08:03:28,587 [DEBUG][$_NIOREACTOR-2-RW] release channel MySQLConnection [id=14, lastTime=1514275408586, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=true, threadId=32, charset=latin1, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=mariadb-slave, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] (io.mycat.backend.datasource.PhysicalDatasource:PhysicalDatasource.java:442)
5. 测试读写分离
在宿主服务器上（docker外面）启动mysql客户端
[yeqiang@localhost ~]$ mysql -uroot -p123456 -h127.0.0.1 -P8066 TESTDB1
mysql: [Warning] Using a password on the command line interface can be insecure.
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.6.29-mycat-1.6-RELEASE-20161028204710 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> show tables;
+------------------+
| Tables_in_testdb |
+------------------+
| tt |
+------------------+
1 row in set (0.00 sec)
mysql>
插入一条数据
mysql> insert into tt(c1)values('asdf');
Query OK, 1 row affected (0.01 sec)
mysql>
此时mycat有日志显示如下
jvm 1 | 2017-12-26 08:07:22,678 [DEBUG][$_NIOREACTOR-0-RW] ServerConnection [id=2, schema=TESTDB1, host=172.17.42.1, user=root,txIsolation=3, autocommit=true, schema=TESTDB1] insert into tt(c1)values('asdf') (io.mycat.net.FrontendConnection:FrontendConnection.java:288)
jvm 1 | 2017-12-26 08:07:22,678 [DEBUG][$_NIOREACTOR-0-RW] ServerConnection [id=2, schema=TESTDB1, host=172.17.42.1, user=root,txIsolation=3, autocommit=true, schema=TESTDB1]insert into tt(c1)values('asdf') (io.mycat.server.ServerQueryHandler:ServerQueryHandler.java:57)
jvm 1 | 2017-12-26 08:07:22,678 [DEBUG][$_NIOREACTOR-0-RW] ServerConnection [id=2, schema=TESTDB1, host=172.17.42.1, user=root,txIsolation=3, autocommit=true, schema=TESTDB1]insert into tt(c1)values('asdf'), route={
jvm 1 | 1 -> dn1{insert into tt(c1)values('asdf')}
jvm 1 | } rrs (io.mycat.server.NonBlockingSession:NonBlockingSession.java:110)
jvm 1 | 2017-12-26 08:07:22,678 [DEBUG][$_NIOREACTOR-0-RW] rrs.getRunOnSlave() null (io.mycat.backend.mysql.nio.handler.SingleNodeHandler:SingleNodeHandler.java:166)
jvm 1 | 2017-12-26 08:07:22,678 [DEBUG][$_NIOREACTOR-0-RW] node.getRunOnSlave() null (io.mycat.backend.mysql.nio.handler.SingleNodeHandler:SingleNodeHandler.java:168)
jvm 1 | 2017-12-26 08:07:22,678 [DEBUG][$_NIOREACTOR-0-RW] node.getRunOnSlave() null (io.mycat.backend.mysql.nio.handler.SingleNodeHandler:SingleNodeHandler.java:177)
jvm 1 | 2017-12-26 08:07:22,678 [DEBUG][$_NIOREACTOR-0-RW] node.getRunOnSlave() null (io.mycat.backend.mysql.nio.handler.SingleNodeHandler:SingleNodeHandler.java:179)
jvm 1 | 2017-12-26 08:07:22,678 [DEBUG][$_NIOREACTOR-0-RW] rrs.getRunOnSlave() null (io.mycat.backend.datasource.PhysicalDBNode:PhysicalDBNode.java:96)
jvm 1 | 2017-12-26 08:07:22,678 [DEBUG][$_NIOREACTOR-0-RW] rrs.getRunOnSlave() null (io.mycat.backend.datasource.PhysicalDBNode:PhysicalDBNode.java:127)
jvm 1 | 2017-12-26 08:07:22,678 [DEBUG][$_NIOREACTOR-0-RW] con need syn ,total syn cmd 1 commands SET names utf8;schema change:false con:MySQLConnection [id=3, lastTime=1514275642678, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=false, threadId=48, charset=utf8, txIsolation=3, autocommit=true, attachment=dn1{insert into tt(c1)values('asdf')}, respHandler=SingleNodeHandler [node=dn1{insert into tt(c1)values('asdf')}, packetId=0], host=mariadb-master, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=true] (io.mycat.backend.mysql.nio.MySQLConnection:MySQLConnection.java:448)
jvm 1 | 2017-12-26 08:07:22,683 [DEBUG][$_NIOREACTOR-3-RW] release connection MySQLConnection [id=3, lastTime=1514275642666, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=false, threadId=48, charset=utf8, txIsolation=3, autocommit=true, attachment=dn1{insert into tt(c1)values('asdf')}, respHandler=SingleNodeHandler [node=dn1{insert into tt(c1)values('asdf')}, packetId=1], host=mariadb-master, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=true] (io.mycat.server.NonBlockingSession:NonBlockingSession.java:341)
jvm 1 | 2017-12-26 08:07:22,683 [DEBUG][$_NIOREACTOR-3-RW] release channel MySQLConnection [id=3, lastTime=1514275642666, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=false, threadId=48, charset=utf8, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=mariadb-master, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] (io.mycat.backend.datasource.PhysicalDatasource:PhysicalDatasource.java:442)
其中 [id=3, lastTime=1514275642678, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=false, threadId=48, charset=utf8, txIsolation=3, autocommit=true, attachment=dn1{insert into tt(c1)values('asdf')}, respHandler=SingleNodeHandler [node=dn1{insert into tt(c1)values('asdf')}, packetId=0], host=mariadb-master, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=true] 说明insert指令路由到了mariadb-master节点上
读取数据
mysql> select * from tt;
+----+-------+
| id | c1 |
+----+-------+
| 1 | ttttt |
| 2 | asdf |
+----+-------+
2 rows in set (0.00 sec)
mysql>
此时mycat有日志显示如下
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] ServerConnection [id=2, schema=TESTDB1, host=172.17.42.1, user=root,txIsolation=3, autocommit=true, schema=TESTDB1] select * from tt (io.mycat.net.FrontendConnection:FrontendConnection.java:288)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] ServerConnection [id=2, schema=TESTDB1, host=172.17.42.1, user=root,txIsolation=3, autocommit=true, schema=TESTDB1]select * from tt (io.mycat.server.ServerQueryHandler:ServerQueryHandler.java:57)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] SQLRouteCache miss cache ,key:TESTDB1select * from tt (io.mycat.cache.impl.EnchachePool:EnchachePool.java:77)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] ServerConnection [id=2, schema=TESTDB1, host=172.17.42.1, user=root,txIsolation=3, autocommit=true, schema=TESTDB1]select * from tt, route={
jvm 1 | 1 -> dn1{select * from tt}
jvm 1 | } rrs (io.mycat.server.NonBlockingSession:NonBlockingSession.java:110)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] rrs.getRunOnSlave() null (io.mycat.backend.mysql.nio.handler.SingleNodeHandler:SingleNodeHandler.java:166)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] node.getRunOnSlave() null (io.mycat.backend.mysql.nio.handler.SingleNodeHandler:SingleNodeHandler.java:168)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] node.getRunOnSlave() null (io.mycat.backend.mysql.nio.handler.SingleNodeHandler:SingleNodeHandler.java:177)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] node.getRunOnSlave() null (io.mycat.backend.mysql.nio.handler.SingleNodeHandler:SingleNodeHandler.java:179)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] rrs.getRunOnSlave() null (io.mycat.backend.datasource.PhysicalDBNode:PhysicalDBNode.java:96)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] rrs.getRunOnSlave() null (io.mycat.backend.datasource.PhysicalDBNode:PhysicalDBNode.java:127)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] select read source hostS1 for dataHost:dh1 (io.mycat.backend.datasource.PhysicalDBPool:PhysicalDBPool.java:456)
jvm 1 | 2017-12-26 08:33:23,413 [DEBUG][$_NIOREACTOR-0-RW] con need syn ,total syn cmd 1 commands SET names utf8;schema change:false con:MySQLConnection [id=12, lastTime=1514277203413, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=true, threadId=31, charset=utf8, txIsolation=3, autocommit=true, attachment=dn1{select * from tt}, respHandler=SingleNodeHandler [node=dn1{select * from tt}, packetId=0], host=mariadb-slave, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] (io.mycat.backend.mysql.nio.MySQLConnection:MySQLConnection.java:448)
jvm 1 | 2017-12-26 08:33:23,414 [DEBUG][$_NIOREACTOR-0-RW] release connection MySQLConnection [id=12, lastTime=1514277203406, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=true, threadId=31, charset=utf8, txIsolation=3, autocommit=true, attachment=dn1{select * from tt}, respHandler=SingleNodeHandler [node=dn1{select * from tt}, packetId=6], host=mariadb-slave, port=3306, statusSync=io.mycat.backend.mysql.nio.MySQLConnection$StatusSync@4118276c, writeQueue=0, modifiedSQLExecuted=false] (io.mycat.server.NonBlockingSession:NonBlockingSession.java:341)
jvm 1 | 2017-12-26 08:33:23,414 [DEBUG][$_NIOREACTOR-0-RW] release channel MySQLConnection [id=12, lastTime=1514277203406, user=root, schema=testdb, old shema=testdb, borrowed=true, fromSlaveDB=true, threadId=31, charset=utf8, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=mariadb-slave, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] (io.mycat.backend.datasource.PhysicalDatasource:PhysicalDatasource.java:442)
其中[node=dn1{select * from tt}, packetId=0], host=mariadb-slave, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]说明select指令被路由到了mariadb-slave节点上
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