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mycat连续分片-)自定义数字范围分片
2025-07-22 09:57  点击:0

1，自定义数字范围分片

自定义数字范围分片，提前规划好分片字段某个范围属于哪个分片，比如说将第一个500W的数据分片在第一个节点上面，第二个500W的数据分片在第二个节点上，依次类推

2，添加配置文件

在function.xml里面进行配置：

<code class=" hljs xml">    <!--{cke_protected}{C}%3C!%2D%2D%20%E5%AF%B9%E8%87%AA%E5%AE%9A%E4%B9%89%E6%95%B0%E5%AD%97%E5%88%86%E7%89%87%E8%A7%84%E5%88%99rang-long-tr04%E7%9A%84%E5%AE%9A%E4%B9%89%20%2D%2D%3E-->        <function name="rang-long-04" class="org.opencloudb.route.function.AutoPartitionByLong">                <property name="mapFile">autopartition-long04.txt</property>                <property name="defaultNode">0</property>                 <property name="type">0</property>        </function>        <!--{cke_protected}{C}%3C!%2D%2D%20%E5%AF%B9%E8%A1%A8%E8%BF%9B%E8%A1%8C%E5%88%86%E7%89%87%E7%9A%84%E6%8F%8F%E8%BF%B0%EF%BC%8C%E5%AD%97%E6%AE%B5%E4%BB%A5%E5%8F%8A%E5%88%86%E7%89%87%E8%A7%84%E5%88%99%20%2D%2D%3E-->        <tablerule name="rang-long-tr04">                 <rule>                         <columns>ID</columns>                          <algorithm>rang-long-04</algorithm>                </rule>        </tablerule></code>

在schema.xml里面进行配置：

autopartition-long04.txt文件的配置：

    [root@crm_idc_squid_1_11 conf]# more autopartition-long04.txt     0-500M=0    500M-1000M=1    1000M-1500M=2    You have mail in /var/spool/mail/root    [root@crm_idc_squid_1_11 conf]#

注意： 此配置非常简单，即预先制定可能的id范围到某个分片，所有的节点配置都是从0开始，及0代表节点1

3，建表并且录入数据

    CREATE TABLE ORDER0401(ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,PROVINCE VARCHAR(16),SN VARCHAR(64),CREATE_TIME DATETIME);mysql> CREATE TABLE ORDER0401(ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,PROVINCE VARCHAR(16),SN VARCHAR(64),CREATE_TIME DATETIME);Query OK, 0 rows affected (0.05 sec)mysql>     INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_10000',NOW());    INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_5000001',NOW());    mysql> explain INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_10000',NOW());    +-----------+--------------------------------------------------------------------------------------------------------+    | DATA_NODE | SQL                                                                                                    |    +-----------+--------------------------------------------------------------------------------------------------------+    | dn21      | INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_10000',NOW()) |    +-----------+--------------------------------------------------------------------------------------------------------+    1 row in set (0.01 sec)    mysql> INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_10000',NOW());    Query OK, 1 row affected (0.01 sec)    mysql> INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_5000001',NOW());    Query OK, 1 row affected (0.00 sec)    mysql>

4，对insert操作流程进行分析，参考mycat.log对路由过程做完整的分析

查看后台mycat.log分析如下：

开始获取连接：    02/12 21:17:13.614  DEBUG [$_NIOREACTOR-1-RW] (ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_10000',NOW())开始建立缓存：    02/12 21:17:13.615  DEBUG [$_NIOREACTOR-1-RW] (RouterUtil.java:951) -try to find cache by primary key    02/12 21:17:13.616   INFO [$_NIOREACTOR-1-RW] (DefaultLayedCachePool.java:80) -create child Cache: TESTDB_ORDER0401 for layered cache TableID2DataNodeCache, size 10000, expire seconds 18000    02/12 21:17:13.616  DEBUG [$_NIOREACTOR-1-RW] (CacheManager.java:794) -Attempting to create an existing singleton. Existing singleton returned.    02/12 21:17:13.616  DEBUG [$_NIOREACTOR-1-RW] (Cache.java:955) -No BootstrapCacheLoaderFactory class specified. Skipping...    02/12 21:17:13.617  DEBUG [$_NIOREACTOR-1-RW] (Cache.java:929) -CacheWriter factory not configured. Skipping...    02/12 21:17:13.618  DEBUG [$_NIOREACTOR-1-RW] (MemoryStore.java:153) -Initialized net.sf.ehcache.store.NotifyingMemoryStore for TableID2DataNodeCache.TESTDB_ORDER0401    02/12 21:17:13.619  DEBUG [$_NIOREACTOR-1-RW] (Cache.java:1165) -Initialised cache: TableID2DataNodeCache.TESTDB_ORDER0401开始路由匹配：    02/12 21:17:13.621  DEBUG [$_NIOREACTOR-1-RW] (NonBlockingSession.java:113) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_10000',NOW()), route={       1 -> dn21{INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_10000',NOW())}    } rrs匹配好路由后，直接往对应的dn21节点开始执行insert数据录入操作：    02/12 21:17:13.624  DEBUG [$_NIOREACTOR-0-RW] (NonBlockingSession.java:229) -release connection MySQLConnection [id=8, lastTime=1455283033608, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=52, charset=latin1, txIsolation=3, autocommit=true, attachment=dn21{INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_10000',NOW())}, respHandler=SingleNodeHandler [node=dn21{INSERT INTO ORDER0401(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_10000',NOW())}, packetId=0], host=13.217.1.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=true]连接释放：    02/12 21:17:13.624  DEBUG [$_NIOREACTOR-0-RW] (PhysicalDatasource.java:403) -release channel MySQLConnection [id=8, lastTime=1455283033608, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=52, charset=latin1, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=13.217.1.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

5，执行简单的查询，如果指定分片字段ID字段，则走分片查询单个分片节点

mycat命令台显示结果：

    mysql> explain select * from ORDER0401 t1 where t1.ID=5000001;    +-----------+------------------------------------------------+    | DATA_NODE | SQL                                            |    +-----------+------------------------------------------------+    | dn22      | select * from ORDER0401 t1 where t1.ID=5000001 |    +-----------+------------------------------------------------+    1 row in set (0.08 sec)    mysql> select * from ORDER0401 t1 where t1.ID=5000001;    +---------+----------+-----------------------+---------------------+    | ID      | PROVINCE | SN                    | CREATE_TIME         |    +---------+----------+-----------------------+---------------------+    | 5000001 | shanghai | shanghai10006_5000001 | 2016-02-12 21:18:17 |    +---------+----------+-----------------------+---------------------+    1 row in set (0.00 sec)    mysql>

查看后台mycat日志信息：

    02/12 21:44:01.116  DEBUG [$_NIOREACTOR-1-RW] (ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select * from ORDER0401 t1 where t1.ID=5000001    02/12 21:44:01.117  DEBUG [$_NIOREACTOR-1-RW] (EnchachePool.java:76) -SQLRouteCache  miss cache ,key:TESTDBselect * from ORDER0401 t1 where t1.ID=5000001    02/12 21:44:01.118  DEBUG [$_NIOREACTOR-1-RW] (RouterUtil.java:951) -try to find cache by primary key    02/12 21:44:01.118  DEBUG [$_NIOREACTOR-1-RW] (EnchachePool.java:76) -TableID2DataNodeCache.TESTDB_ORDER0401  miss cache ,key:5000001    02/12 21:44:01.118  DEBUG [$_NIOREACTOR-1-RW] (NonBlockingSession.java:113) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select * from ORDER0401 t1 where t1.ID=5000001, route={       1 -> dn22{select * from ORDER0401 t1 where t1.ID=5000001}    } rrs    02/12 21:44:01.119  DEBUG [$_NIOREACTOR-1-RW] (PhysicalDBPool.java:452) -select read source hostM2 for dataHost:m2    02/12 21:44:01.120  DEBUG [$_NIOREACTOR-1-RW] (NonBlockingSession.java:229) -release connection MySQLConnection [id=17, lastTime=1455284641106, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=59, charset=latin1, txIsolation=3, autocommit=true, attachment=dn22{select * from ORDER0401 t1 where t1.ID=5000001}, respHandler=SingleNodeHandler [node=dn22{select * from ORDER0401 t1 where t1.ID=5000001}, packetId=7], host=13.217.1.11, port=3327, statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@6d1ef03, writeQueue=0, modifiedSQLExecuted=false]    02/12 21:44:01.121  DEBUG [$_NIOREACTOR-1-RW] (PhysicalDatasource.java:403) -release channel MySQLConnection [id=17, lastTime=1455284641106, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=59, charset=latin1, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=13.217.1.11, port=3327, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

6，如果分片字段范围的查询，则走所有节点去检索，哪怕只有一条数据在一个分片上，route路由也是走所有的分片进行检索查询

    mysql> explain select * from ORDER0401 t1 where t1.ID<50000;    +-----------+----------------------------------------------------------+    | DATA_NODE | SQL                                                      |    +-----------+----------------------------------------------------------+    | dn21      | SELECT * FROM ORDER0401 t1 WHERE t1.ID < 50000 LIMIT 100 |    | dn22      | SELECT * FROM ORDER0401 t1 WHERE t1.ID < 50000 LIMIT 100 |    +-----------+----------------------------------------------------------+    2 rows in set (0.01 sec)    mysql>

7，如果不走分片字段的查询，即使是单个数据，也要route路由所有的分片，走所有的分片进行查询

    mysql> explain select * from ORDER0401 t1 where t1.SN='shanghai10006_10000';    +-----------+--------------------------------------------------------------------------+    | DATA_NODE | SQL                                                                      |    +-----------+--------------------------------------------------------------------------+    | dn21      | SELECT * FROM ORDER0401 t1 WHERE t1.SN = 'shanghai10006_10000' LIMIT 100 |    | dn22      | SELECT * FROM ORDER0401 t1 WHERE t1.SN = 'shanghai10006_10000' LIMIT 100 |    +-----------+--------------------------------------------------------------------------+    2 rows in set (0.00 sec)    mysql>