mycat 分頁慢原理解析、mycat跨事務解惑、mycat注解調用存儲過程分析

本文轉載自查看原文 2017-07-27 09:54 2282

１結合Ｍｙｃａｔ日志，分析select * from travelrecord order by id limit100000,100 的運行過程，解釋下當limit M,N中的M非常大的情況下。為什么查詢結果會變慢非常多

1.1mycat控制命令台顯示。explain出來走了全部的節點

         mysql>explain select * from travelrecord order by id limit 100000,100 ;
         +-----------+--------------------------------------------------------+
         |DATA_NODE | SQL                                                   |
         +-----------+--------------------------------------------------------+
         |dn1       | SELECT * FROM travelrecordORDER BY id LIMIT 0, 100100 |
         |dn2       | SELECT * FROM travelrecordORDER BY id LIMIT 0, 100100 |
         |dn3       | SELECT * FROM travelrecordORDER BY id LIMIT 0, 100100 |
         +-----------+--------------------------------------------------------+
         3rows in set (0.01 sec)

         mysql>

本文源自mchdba（黃杉）博客地址：http://blog.csdn.net/mchdba/article/details/50719120，未經過mchdba同意，謝絕轉載

1.2看后台mycat.log日志：

         02/1417:52:30.103  DEBUG [$_NIOREACTOR-0-RW](ServerQueryHandler.java:56) -ServerConnection [id=3, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]explainselect * from travelrecord order by id limit 1000000,100
         02/1417:52:30.103  DEBUG [$_NIOREACTOR-0-RW](EnchachePool.java:76) -SQLRouteCache miss cache ,key:TESTDB select * from travelrecord order by id limit1000000,100 02/1417:52:30.105 DEBUG [$_NIOREACTOR-0-RW] (EnchachePool.java:59)-SQLRouteCache add cache ,key:TESTDB select * from travelrecord order by idlimit 1000000,100 value:select * from travelrecord order by id limit1000000,100, route={ 1 -> dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 2 -> dn2{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 3 -> dn3{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} } 02/1417:52:33.880 DEBUG [$_NIOREACTOR-0-RW](ServerQueryHandler.java:56) -ServerConnection [id=3, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select* from travelrecord order by id limit 1000000,100 02/1417:52:33.881 DEBUG [$_NIOREACTOR-0-RW](EnchachePool.java:76) -SQLRouteCache miss cache ,key:TESTDBselect * from travelrecord order by id limit1000000,100 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](EnchachePool.java:59) -SQLRouteCache add cache ,key:TESTDBselect * fromtravelrecord order by id limit 1000000,100 value:select * from travelrecordorder by id limit 1000000,100, route={ 1 -> dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 2 -> dn2{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 3 -> dn3{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} } 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](NonBlockingSession.java:113) -ServerConnection [id=3, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select* from travelrecord order by id limit 1000000,100, route={ 1 -> dn1{SELECT * FROMtravelrecord ORDERBY id 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](NonBlockingSession.java:113) -ServerConnection [id=3, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select* from travelrecord order by id limit 1000000,100, route={ 1 -> dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 2 -> dn2{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 3 -> dn3{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} }rrs 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:82) -execute mutinode query select * from travelrecordorder by id limit 1000000,100 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:97) -has data merge logic 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](PhysicalDBPool.java:452) -select read source hostM1 for dataHost:wgq_idc_mon_1_12 02/1417:52:33.883 DEBUG [$_NIOREACTOR-0-RW](PhysicalDBPool.java:452) -select read source hostM1 fordataHost:wgq_idc_mon_1_12 02/1417:52:33.883 DEBUG [$_NIOREACTOR-0-RW](PhysicalDBPool.java:452) -select read source hostM1 for dataHost:wgq_idc_mon_1_12 02/1417:52:33.883 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=19, lastTime=1455443553868, user=root, schema=db1, oldshema=db1, borrowed=true, fromSlaveDB=false, threadId=220, charset=latin1,txIsolation=3, autocommit=true, attachment=dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@b47af37,writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.884 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:241) -on row end reseponse MySQLConnection [id=25,lastTime=1455443553868, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=227, charset=latin1, txIsolation=3,autocommit=true, attachment=dn3{SELECT * FROMtravelrecord 02/1417:52:33.883 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=19, lastTime=1455443553868, user=root, schema=db1, oldshema=db1, borrowed=true, fromSlaveDB=false, threadId=220, charset=latin1,txIsolation=3, autocommit=true, attachment=dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@b47af37,writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.884 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:241) -on row end reseponse MySQLConnection [id=25,lastTime=1455443553868, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=227, charset=latin1, txIsolation=3,autocommit=true, attachment=dn3{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=false] 02/1417:52:33.884 DEBUG [$_NIOREACTOR-3-RW](DataMergeService.java:94) -field metadata inf:[ID=ColMeta [colIndex=0,colType=8], DAYS=ColMeta [colIndex=4, colType=3], TRAVELDATE=ColMeta[colIndex=2, colType=10], USER_ID=ColMeta [colIndex=1, colType=253],FEE=ColMeta [colIndex=3, colType=246]] 02/1417:52:33.884 DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=25,lastTime=1455443553868, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=227, charset=latin1, txIsolation=3,autocommit=true, attachment=dn3{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=false] 02/1417:52:33.885 DEBUG [$_NIOREACTOR-1-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=25,lastTime=1455443553868, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=227, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.886 DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=19,lastTime=1455443553868, user=root, schema=db1, old shema=db1, borrowed=true,fromSlaveDB=false, threadId=220, charset=latin1, txIsolation=3,autocommit=true, attachment=dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100}, respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@b47af37,writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.886 DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=19,lastTime=1455443553868, user=root, schema=db1, old shema=db1, borrowed=true,fromSlaveDB=false, threadId=220, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111, port=3317,statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.886 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:241) -on row end reseponse MySQLConnection [id=42,lastTime=1455443553868, user=root, schema=db2, old shema=db2, borrowed=true,fromSlaveDB=false, threadId=234, charset=latin1, txIsolation=3,autocommit=true, attachment=dn2{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=false] 02/1417:52:33.886 DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=42,lastTime=1455443553868, user=root, schema=db2, old shema=db2, borrowed=true,fromSlaveDB=false, threadId=234, charset=latin1, txIsolation=3,autocommit=true, attachment=dn2{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.886 DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=42,lastTime=1455443553868, user=root, schema=db2, old shema=db2, borrowed=true,fromSlaveDB=false, threadId=234, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.887 DEBUG [BusinessExecutor5](DataMergeService.java:296) -prepare mpp merge result for select * fromtravelrecord order by id limit 1000000,100 02/1417:52:33.887 DEBUG [BusinessExecutor5](MultiNodeQueryHandler.java:324) -last packet id:8

路由里面是先查limit 0,1000000條。然后再查出limit 0,1000100條記錄。在這個基礎上查出100條（prepare mpp mergeresult for select * from travelrecord order by id limit 1000000,100），所以假設這個M=1000000越來越大，一次性拉的數據就越大，這樣就越來越慢了，那么須要查詢的數據就比較多

２結合Mycat日志。分析跨分片事務的運行過程。以一個正常的跨分片SQL的事務過程，以及,一個錯誤SQL為例（比方某個分片上主鍵沖突或其它ＳＱＬ錯誤，導致無法運行成功）分別加, 以說明

2.1 正常的跨分片事務分析

運行情況：

         mysql>set autocommit=0
         mysql>update order040302 set SN=concat(SN,'-mycat');
         QueryOK, 2 rows affected (0.01 sec)
         Rowsmatched: 1  Changed: 1  Warnings: 0
         mysql>commit;

mycat.log日志顯示：

         02/1800:01:24.351  DEBUG [$_NIOREACTOR-1-RW](ServerQueryHandler.java:56) -ServerConnection [id=4, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]updateorder040302 set SN=concat(SN,'-mycat') 02/1800:01:24.356 DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:113) -ServerConnection [id=4, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]updateorder040302 set SN=concat(SN,'-mycat'), route={ 1 -> dn21{update order040302 setSN=concat(SN,'-mycat')} 2 -> dn22{update order040302 setSN=concat(SN,'-mycat')} }rrs 02/1800:01:24.356 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:82) -execute mutinode query update order040302 setSN=concat(SN,'-mycat') 02/1800:01:24.357 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=7, lastTime=1455724884356, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=218, charset=latin1,txIsolation=3, autocommit=true, attachment=dn21{update order040302 setSN=concat(SN,'-mycat')},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3317, statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@71a27302,writeQueue=0, modifiedSQLExecuted=true] 02/1800:01:24.358 DEBUG [$_NIOREACTOR-2-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:truefrom MySQLConnection [id=30, lastTime=1455724884356, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=200, charset=latin1,txIsolation=3, autocommit=true, attachment=dn22{update order040302 setSN=concat(SN,'-mycat')},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/1800:01:24.359 DEBUG [$_NIOREACTOR-2-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=30,lastTime=1455724884356, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=200, charset=latin1, txIsolation=3,autocommit=true, attachment=dn22{update order040302 setSN=concat(SN,'-mycat')},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/1800:01:24.359 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:truefrom MySQLConnection [id=7, lastTime=1455724884356, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=218, charset=latin1,txIsolation=3, autocommit=true, attachment=dn21{update order040302 setSN=concat(SN,'-mycat')}, respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/1800:01:24.359 DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=7,lastTime=1455724884356, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=218, charset=latin1, txIsolation=3,autocommit=true, attachment=dn21{update order040302 setSN=concat(SN,'-mycat')}, respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/1800:01:24.359 DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=7,lastTime=1455724884356, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=218, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

分析結果：update語句是改動全部的節點上的數據，02/18 00:01:24.356處NonBlockingSession啟動了分布式事務，以下就分別在02/18 00:01:24.359有2處 NonBlockingSession.java:229在dn21、dn22上面運行了2遍，大家看到在2個節點dn21和dn22都運行完畢后，才有(PhysicalDatasource.java:403)-release channel MySQLConnection開始關閉釋放連接，也就是說等全部節點都運行完畢后才結束整個事務。

2.2 非正常的sql事務運行，有一處報錯的情況下（失敗經過）

     准備數據。須要一個節點成功，一個節點失敗，所以准備拿SN字段的長度來做實驗。一個超過報錯。一個沒有超過不報錯

2.2.1 查看表結構：

 mysql>show create table order040302; +-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 |Table | Create Table | +-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 |order040302 | CREATE TABLE `order040302` (
 `ID` int(11) NOT NULL AUTO_INCREMENT,
 `CODE` varchar(64) DEFAULT NULL,
 `SN` varchar(64) DEFAULT NULL,
 `CREATE_TIME` datetime DEFAULT NULL,
 PRIMARY KEY (`ID`)
 )ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4 | +-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 1row in set (0.00 sec)

 mysql>

改動數據，設置成如此，一會就能夠update一個節點失敗一個節點成功了，在ID=1的節點上由於長度超過64報錯。而在ID=2的節點上面則長度小於64而正常運行：

mysql> update order040302 set SN =concat('',SN,'___',SN) where ID=1;
         QueryOK, 1 row affected (0.01 sec)
         Rowsmatched: 1  Changed: 1  Warnings: 0

 mysql>select length(t1.SN),t1.* from order040302 t1;
         +---------------+----+------------+-------------------------------------------------------+---------------------+
         |length(t1.SN) | ID | CODE       | SN                                                   | CREATE_TIME         |
         +---------------+----+------------+-------------------------------------------------------+---------------------+
         |            53 |  1 | 0-10000020 |beijing_03-10000020-mycat___beijing_03-10000020-mycat | 2016-02-13 00:40:27 |
         |            26 |  2 | 1-10000020 |shanghai_10-10000020-mycat                            | 2016-02-1300:40:18 |
         +---------------+----+------------+-------------------------------------------------------+---------------------+
         2rows in set (0.00 sec)

mysql>   update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN) ;

2.2.2 mycat.log日志例如以下：

         02/2205:44:39.666  DEBUG [$_NIOREACTOR-0-RW](ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]updateorder040302 set SN = concat('fenpianyigechenggong_yigeshibai_',SN) 02/2205:44:39.821 DEBUG [$_NIOREACTOR-0-RW](NonBlockingSession.java:113) -ServerConnection [id=1, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]updateorder040302 set SN = concat('fenpianyigechenggong_yigeshibai_',SN), route={ 1 -> dn21{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)} 2 -> dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)} }rrs 02/2205:44:39.827 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:82) -execute mutinode query update order040302 setSN = concat('fenpianyigechenggong_yigeshibai_',SN) 02/2205:44:39.830 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=7, lastTime=1456091079827, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=245, charset=latin1,txIsolation=3, autocommit=true, attachment=dn21{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@1c70f0b1,host=110.254.11.111, port=3317, statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@64b49aaa,writeQueue=0, modifiedSQLExecuted=true] 02/2205:44:39.831 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=12, lastTime=1456091079827, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=222, charset=latin1,txIsolation=3, autocommit=true, attachment=dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)}, respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@1c70f0b1,host=110.254.11.111, port=3327,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@306b3db1,writeQueue=0, modifiedSQLExecuted=true] 02/2205:44:39.831 DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=7,lastTime=1456091079827, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=245, charset=latin1, txIsolation=3,autocommit=true, attachment=dn21{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@1c70f0b1,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@64b49aaa,writeQueue=0, modifiedSQLExecuted=true] 02/2205:44:39.832 DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=7,lastTime=1456091079827, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=245, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/2205:44:39.832 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:truefrom MySQLConnection [id=12, lastTime=1456091079827, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=222, charset=latin1,txIsolation=3, autocommit=true, attachment=dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@1c70f0b1,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2205:44:39.832 WARN [$_NIOREACTOR-3-RW](MultiNodeHandler.java:127) -error response from MySQLConnection [id=7,lastTime=1456091079827, user=root, schema=db3, old shema=db3, borrowed=false,fromSlaveDB=false, threadId=245, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] err Datatoo long for column 'SN' at row 1 code:1406 02/2205:44:39.833 DEBUG [$_NIOREACTOR-0-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=12,lastTime=1456091079827, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=222, charset=latin1, txIsolation=3,autocommit=true, attachment=dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@1c70f0b1,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2205:44:39.834 DEBUG [$_NIOREACTOR-0-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=12,lastTime=1456091079827, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=222, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111, port=3327,statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/2205:44:39.835 DEBUG [$_NIOREACTOR-0-RW](MultiNodeHandler.java:194) -error all end ,clear session resource

從日志記錄里面能夠看出：[ NIOREACTOR−3−RW]dn21節點失敗。報錯errDatatoolongforcolumn′SN′atrow1code:1406。[ _NIOREACTOR-0-RW]節點dn22成功了，所以最后提示-error all end ,clear sessionresource，整個事務退出。清空當前會話資源，結論就是一個節點dn21失敗。單節點回退。可是成功的節點dn22不會回退。這是怎么回事呢？查看運行后的數據結果例如以下：

         mysql>select length(t1.SN),t1.* from order040302 t1;
         +---------------+----+------------+------------------------------------------------------------+---------------------+
         |length(t1.SN) | ID | CODE       | SN                                                        | CREATE_TIME         |
         +---------------+----+------------+------------------------------------------------------------+---------------------+
         |            53 |  1 | 0-10000020 |beijing_03-10000020-mycat___beijing_03-10000020-mycat      | 2016-02-13 00:40:27 |
         |            58 |  2 | 1-10000020 |fenpianyigechenggong_yigeshibai_shanghai_10-10000020-mycat | 2016-02-1300:40:18 |
         +---------------+----+------------+------------------------------------------------------------+---------------------+
         2rows in set (0.06 sec)

  mysql>

可見，我這個不是事務，事務會全部一起回退的。

mycat窗體中怎樣開啟事務？

2.3 怎樣mysql窗體那樣，在mycat窗體開啟事務

2.3.1 開啟事務，手動提交

     mysql>set autocommit=0;
     QueryOK, 0 rows affected (0.00 sec)

     mysql>update order040302 set SN = concat('fenpianyigechenggong_yigeshibai_',SN) ;
     ERROR1105 (HY000): Data too long for column 'SN' at row 1
     mysql>commit;
     ERROR1003 (HY000): Transaction error, need to rollback.
     mysql>
     mysql>select length(t1.SN),t1.* from order040302 t1;
     ERROR1003 (HY000): Transaction error, need to rollback.Data too long for column 'SN'at row 1
     mysql>
     mysql>rollback;
     QueryOK, 0 rows affected (0.01 sec)

     mysql>
     mysql>select length(t1.SN),t1.* from order040302 t1;
     +---------------+----+------------+-------------------------------------------------------+---------------------+
     |length(t1.SN) | ID | CODE       | SN                                                   | CREATE_TIME         |
     +---------------+----+------------+-------------------------------------------------------+---------------------+
     |            53 |  1 | 0-10000020 |beijing_03-10000020-mycat___beijing_03-10000020-mycat | 2016-02-13 00:40:27 |
     |            26 |  2 | 1-10000020 |shanghai_10-10000020-mycat                            | 2016-02-1300:40:18 |
     +---------------+----+------------+-------------------------------------------------------+---------------------+
     2rows in set (0.09 sec)

     mysql>

2.3.2 后台mycat.log日志例如以下，run失敗信息例如以下：

         02/2217:54:25.035  DEBUG [$_NIOREACTOR-1-RW](ServerQueryHandler.java:56) -ServerConnection [id=2, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=false, schema=TESTDB]updateorder040302 set SN = concat('fenpianyigechenggong_yigeshibai_',SN) 02/2217:54:25.187 DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:113) -ServerConnection [id=2, schema=TESTDB, host=127.0.0.1,user=test,txIsolation=3, autocommit=false, schema=TESTDB]update order040302 setSN = concat('fenpianyigechenggong_yigeshibai_',SN), route={ 1 -> dn21{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)} 2 -> dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)} }rrs 02/2217:54:25.193 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:82) -execute mutinode query update order040302 setSN = concat('fenpianyigechenggong_yigeshibai_',SN) 02/2217:54:25.195 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=7, lastTime=1456134865193, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=278, charset=latin1,txIsolation=0, autocommit=true, attachment=dn21{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@243cc381,host=110.254.11.111, port=3317, statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true] 02/2217:54:25.196 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=17, lastTime=1456134865193, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=259, charset=latin1,txIsolation=0, autocommit=true, attachment=dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@243cc381,host=110.254.11.111, port=3327,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@46e9d255,writeQueue=0, modifiedSQLExecuted=true] 02/2217:54:25.196 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=7, lastTime=1456134865193, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=278, charset=latin1,txIsolation=3, autocommit=false, attachment=dn21{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@243cc381,host=110.254.11.111, port=3317, statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true] 02/2217:54:25.196 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=17, lastTime=1456134865193, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=259, charset=latin1,txIsolation=3, autocommit=false, attachment=dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)}, respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@243cc381,host=110.254.11.111, port=3327,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@46e9d255,writeQueue=0, modifiedSQLExecuted=true] 02/2217:54:25.197 WARN [$_NIOREACTOR-3-RW](MultiNodeHandler.java:127) -error response from MySQLConnection [id=7,lastTime=1456134865193, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=278, charset=latin1, txIsolation=3,autocommit=false, attachment=dn21{update order040302 set SN = concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@243cc381,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true] err Data too long for column 'SN' atrow 1 code:1406 02/2217:54:25.197 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:truefrom MySQLConnection [id=17, lastTime=1456134865193, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=259, charset=latin1,txIsolation=3, autocommit=false, attachment=dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@243cc381,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2217:54:25.199 DEBUG [$_NIOREACTOR-1-RW](MultiNodeHandler.java:194) -error all end ,clear session resource

2.3.3后台mycat.log日志，rollback操作日志例如以下：

         02/2217:57:17.432  DEBUG [$_NIOREACTOR-1-RW](ServerQueryHandler.java:56) -ServerConnection [id=2, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=false,schema=TESTDB]rollback 02/2217:57:17.434 DEBUG [$_NIOREACTOR-1-RW] (RollbackNodeHandler.java:71)-rollback job run for MySQLConnection [id=7, lastTime=1456134865193, user=root,schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=278,charset=latin1, txIsolation=3, autocommit=false, attachment=dn21{updateorder040302 set SN = concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@243cc381,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true] 02/2217:57:17.435 DEBUG [$_NIOREACTOR-1-RW](RollbackNodeHandler.java:71) -rollback job run for MySQLConnection [id=17,lastTime=1456134865193, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=259, charset=latin1, txIsolation=3,autocommit=false, attachment=dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@243cc381,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2217:57:17.436 DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:361) -clear session resourcesorg.opencloudb.server.NonBlockingSession@4483dae0 02/2217:57:17.436 DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=7,lastTime=1456134865193, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=278, charset=latin1, txIsolation=3,autocommit=false, attachment=dn21{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.RollbackNodeHandler@2c96cb44,host=110.254.11.111, port=3317, statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true] 02/2217:57:17.438 DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=17,lastTime=1456134865193, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=259, charset=latin1, txIsolation=3,autocommit=false, attachment=dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.RollbackNodeHandler@2c96cb44,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2217:57:17.438 DEBUG [$_NIOREACTOR-3-RW](RollbackReleaseHandler.java:58) -autocomit is false,but no commit or rollback,so mycat rollbacked backend conn MySQLConnection [id=7,lastTime=1456134865193, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=278, charset=latin1, txIsolation=3,autocommit=false, attachment=null,respHandler=org.opencloudb.mysql.nio.handler.RollbackReleaseHandler@56683a8d,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true] 02/2217:57:17.439 DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=7,lastTime=1456134865193, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=278, charset=latin1, txIsolation=3,autocommit=false, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/2217:57:17.439 DEBUG [$_NIOREACTOR-1-RW](RollbackReleaseHandler.java:58) -autocomit is false,but no commit or rollback,so mycat rollbacked backend conn MySQLConnection [id=17,lastTime=1456134865193, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=259, charset=latin1, txIsolation=3,autocommit=false, attachment=null,respHandler=org.opencloudb.mysql.nio.handler.RollbackReleaseHandler@429eb61a,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2217:57:17.440 DEBUG [$_NIOREACTOR-1-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=17,lastTime=1456134865193, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=259, charset=latin1, txIsolation=3,autocommit=false, attachment=null, respHandler=null, host=110.254.11.111,port=3327, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

看到在運行update的時候，有報錯信息：在dn21節點上面err Data too long forcolumn ‘SN’ at row 1 code:1406，所以依照理論上不論什么節點錯誤發生了，就面臨rollback的錯誤信息，不論什么不論什么都會提示報錯信息。僅僅能運行rollback來恢復。PS：這里眼下的mycat版本號沒有辦法做到在update失敗后自己主動rollback，須要手動rollback操作。

３創建一個在多個分片上存在的存儲過程。存儲過程能夠是統計某個表的記錄個數並返回。然后用Mycat注解方式完畢調用

3.1准備好的簡單的存儲過程

         DELIMITER$$
         CREATE PROCEDUREdb3.pro_select() BEGIN SELECTCOUNT(1) FROM order040302;
                   END$$ DELIMITER;

3.2在各mysql節點上運行創建存儲過程

dn21節點上的mysql窗體上：

         mysql>DELIMITER $$
         mysql>CREATE
                   ->     PROCEDURE `db3`.`pro_select`() -> BEGIN ->SELECT COUNT(1) FROM order040302;
                   ->     END$$
         QueryOK, 0 rows affected (0.01 sec)

         mysql>DELIMITER ;
         mysql>

dn22節點上的mysql窗體上：

         mysql>DELIMITER $$
         mysql>CREATE
                   ->     PROCEDURE `db3`.`pro_select`() -> BEGIN ->SELECT COUNT(1) FROM order040302;
                   ->     END$$
         QueryOK, 0 rows affected (0.01 sec)

         mysql>DELIMITER ;
         mysql>

檢查存儲過程：

         mysql>select * from information_schema.ROUTINES\G
         ***************************1. row ***************************
                               SPECIFIC_NAME: pro_select
                             ROUTINE_CATALOG: def
                              ROUTINE_SCHEMA: db3
                                     ROUTINE_NAME:pro_select
                                     ROUTINE_TYPE:PROCEDURE DATA_TYPE:
         CHARACTER_MAXIMUM_LENGTH:NULL
           CHARACTER_OCTET_LENGTH: NULL
                      NUMERIC_PRECISION: NULL
                               NUMERIC_SCALE: NULL
                     DATETIME_PRECISION: NULL
                     CHARACTER_SET_NAME: NULL
                              COLLATION_NAME: NULL
                              DTD_IDENTIFIER: NULL
                                     ROUTINE_BODY:SQL
                     ROUTINE_DEFINITION: BEGIN
         SELECTCOUNT(1) FROM order040302;
                   END
                               EXTERNAL_NAME: NULL
                      EXTERNAL_LANGUAGE: NULL
                             PARAMETER_STYLE: SQL
                            IS_DETERMINISTIC: NO
                             SQL_DATA_ACCESS: CONTAINS SQL
                                               SQL_PATH:NULL
                               SECURITY_TYPE: DEFINER
                                                CREATED: 2016-02-22 19:17:12
                                     LAST_ALTERED:2016-02-22 19:17:12
                                               SQL_MODE:STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION
                             ROUTINE_COMMENT:
                                                DEFINER: root@localhost
                   CHARACTER_SET_CLIENT:latin1
                   COLLATION_CONNECTION:latin1_swedish_ci
                     DATABASE_COLLATION: utf8mb4_general_ci
         1row in set (0.00 sec)

         mysql>

然后在mycat中運行：

         mysql>/*!mycat:sql=select * from order040302 where ID=2*/ call pro_select();
         +----------+
         |COUNT(1) |
         +----------+
         |        1 |
         |        1 |
         +----------+
         2rows in set (0.01 sec)

         QueryOK, 0 rows affected (0.01 sec)

         mysql>

問題，為啥是2行記錄，不知道能夠不能夠並成一行記錄呢？
普通sql到了最后會有例如以下：

02/23 00:07:21.478  DEBUG [BusinessExecutor0] (DataMergeService.java:296) -prepare mpp merge result for select count(*) from order040302
02/23 00:07:21.479  DEBUG [BusinessExecutor0] (MultiNodeQueryHandler.java:324) -last packet id:5

的聚合操作，有了這個merge result操作后，就會把2條記錄變成一條記錄。可是mycat注解后的運行sql顯示注解后，沒有這一個merge result的操作，所以是2條記錄。

哇塞。我好偉大，發現了當中的差別，可是那么新問題來了，怎么完好注解后生成的2條記錄變成為1條記錄額？

3.3看后台mycat.log日志：

看到日志中42.293記錄。走的route路由進入dn21和dn22節點上面，終於運行的是注解的-execute mutinode query select * from order040302。例如以下所看到的：

02/22 20:19:42.292  DEBUG [$_NIOREACTOR-1-RW](ServerQueryHandler.java:56) -ServerConnection [id=10, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true,schema=TESTDB]/*!mycat:sql=select * from order040302*/ call pro_select() 02/22 20:19:42.293 DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:113) -ServerConnection [id=10, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select* from order040302, route={ 1 -> dn21{call pro_select()} 2 -> dn22{call pro_select()} } rrs 02/22 20:19:42.293 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:82) -execute mutinode query select * fromorder040302 02/2220:19:42.295 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=4, lastTime=1456143582284, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=280, charset=latin1,txIsolation=3, autocommit=true, attachment=dn21{call pro_select()},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@ba5d1a4,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@939bc30,writeQueue=0, modifiedSQLExecuted=true] 02/2220:19:42.295 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:241) -on row end reseponse MySQLConnection [id=11,lastTime=1456143582284, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=254, charset=latin1, txIsolation=3, autocommit=true,attachment=dn22{call pro_select()},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@ba5d1a4,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2220:19:42.295 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:241) -on row end reseponse MySQLConnection [id=4,lastTime=1456143582284, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=280, charset=latin1, txIsolation=3,autocommit=true, attachment=dn21{call pro_select()},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@ba5d1a4,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@939bc30,writeQueue=0, modifiedSQLExecuted=true] 02/2220:19:42.296 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:280) -last packet id:6 02/2220:19:42.295 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:truefrom MySQLConnection [id=11, lastTime=1456143582284, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=254, charset=latin1,txIsolation=3, autocommit=true, attachment=dn22{call pro_select()},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@ba5d1a4,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2220:19:42.296 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:truefrom MySQLConnection [id=4, lastTime=1456143582284, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=280, charset=latin1,txIsolation=3, autocommit=true, attachment=dn21{call pro_select()},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@ba5d1a4,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2220:19:42.296 DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=11,lastTime=1456143582284, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=254, charset=latin1, txIsolation=3,autocommit=true, attachment=dn22{call pro_select()},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@ba5d1a4,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2220:19:42.296 DEBUG [$_NIOREACTOR-0-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=4,lastTime=1456143582284, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=280, charset=latin1, txIsolation=3,autocommit=true, attachment=dn21{call pro_select()},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@ba5d1a4,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/2220:19:42.296 DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=11,lastTime=1456143582284, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=254, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111, port=3327,statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/2220:19:42.297 DEBUG [$_NIOREACTOR-0-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=4,lastTime=1456143582284, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveD**重點內容**B=false, threadId=280, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

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