１结合Ｍｙｃａｔ日志，分析select * from travelrecord order by id limit100000,100 的运行过程，解释下当limit M,N中的M非常大的情况下。为什么查询结果会变慢非常多

1.1mycat控制命令台显示。explain出来走了全部的节点

  1.          mysql>explain select * from travelrecord order by id limit 100000,100 ;
  2.          +-----------+--------------------------------------------------------+
  3.          |DATA_NODE | SQL                                                   |
  4.          +-----------+--------------------------------------------------------+
  5.          |dn1       | SELECT * FROM travelrecordORDER BY id LIMIT 0, 100100 |
  6.          |dn2       | SELECT * FROM travelrecordORDER BY id LIMIT 0, 100100 |
  7.          |dn3       | SELECT * FROM travelrecordORDER BY id LIMIT 0, 100100 |
  8.          +-----------+--------------------------------------------------------+
  9.          3rows in set (0.01 sec)
  11.          mysql>

本文源自mchdba（黄杉）博客地址：http://blog.csdn.net/mchdba/article/details/50719120，未经过mchdba同意，谢绝转载

1.2看后台mycat.log日志：

  1.          02/1417:52:30.103  DEBUG [$_NIOREACTOR-0-RW](ServerQueryHandler.java:56) -ServerConnection [id=3, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]explainselect * from travelrecord order by id limit 1000000,100
  2.          02/1417:52:30.103  DEBUG [$_NIOREACTOR-0-RW](EnchachePool.java:76) -SQLRouteCache miss cache ,key:TESTDB select * from travelrecord order by id limit1000000,100
  3.          02/1417:52:30.105  DEBUG [$_NIOREACTOR-0-RW] (EnchachePool.java:59)-SQLRouteCache add cache ,key:TESTDB select * from travelrecord order by idlimit 1000000,100 value:select * from travelrecord order by id limit1000000,100, route={
  4.             1 -> dn1{SELECT *
  5.          FROMtravelrecord
  6.          ORDERBY id
  7.          LIMIT0, 1000100}
  8.             2 -> dn2{SELECT *
  9.          FROMtravelrecord
  10.          ORDERBY id
  11.          LIMIT0, 1000100}
  12.             3 -> dn3{SELECT *
  13.          FROMtravelrecord
  14.          ORDERBY id
  15.          LIMIT0, 1000100}
  16.          }
  17.          02/1417:52:33.880  DEBUG [$_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
  18.          02/1417:52:33.881  DEBUG [$_NIOREACTOR-0-RW](EnchachePool.java:76) -SQLRouteCache miss cache ,key:TESTDBselect * from travelrecord order by id limit1000000,100
  19.          02/1417:52:33.882  DEBUG [$_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={
  20.             1 -> dn1{SELECT *
  21.          FROMtravelrecord
  22.          ORDERBY id
  23.          LIMIT0, 1000100}
  24.             2 -> dn2{SELECT *
  25.          FROMtravelrecord
  26.          ORDERBY id
  27.          LIMIT0, 1000100}
  28.             3 -> dn3{SELECT *
  29.          FROMtravelrecord
  30.          ORDERBY id
  31.          LIMIT0, 1000100}
  32.          }
  33.         02/1417:52:33.882  DEBUG [$_NIOREACTOR-0-RW](NonBlockingSession.java:113) -ServerConnection [id=3, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select* from travelrecord order by id limit 1000000,100, route={
  34.             1 -> dn1{SELECT *
  35.          FROMtravelrecord
  36.          ORDERBY id
  38.         02/1417:52:33.882  DEBUG [$_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={
  39.             1 -> dn1{SELECT *
  40.          FROMtravelrecord
  41.          ORDERBY id
  42.          LIMIT0, 1000100}
  43.             2 -> dn2{SELECT *
  44.          FROMtravelrecord
  45.          ORDERBY id
  46.          LIMIT0, 1000100}
  47.             3 -> dn3{SELECT *
  48.          FROMtravelrecord
  49.          ORDERBY id
  50.          LIMIT0, 1000100}
  51.          }rrs
  52.          02/1417:52:33.882  DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:82) -execute mutinode query select * from travelrecordorder by id limit 1000000,100
  53.          02/1417:52:33.882  DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:97) -has data merge logic
  54.          02/1417:52:33.882  DEBUG [$_NIOREACTOR-0-RW](PhysicalDBPool.java:452) -select read source hostM1 for dataHost:wgq_idc_mon_1_12
  55.          02/1417:52:33.883  DEBUG [$_NIOREACTOR-0-RW](PhysicalDBPool.java:452) -select read source hostM1 fordataHost:wgq_idc_mon_1_12
  56.          02/1417:52:33.883  DEBUG [$_NIOREACTOR-0-RW](PhysicalDBPool.java:452) -select read source hostM1 for dataHost:wgq_idc_mon_1_12
  57.          02/1417:52:33.883  DEBUG [$_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 *
  58.          FROMtravelrecord
  59.          ORDERBY id
  60.          LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@b47af37,writeQueue=0, modifiedSQLExecuted=false]
  61.          02/1417:52:33.884  DEBUG [$_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 *
  62.          FROMtravelrecord
  64.          02/1417:52:33.883  DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=19, lastTime=1455443553868, user=root, schema=db1, oldshema=db1, borrowed=true, fromSlaveDB=false, threadId=220, charset=latin1,txIsolation=3, autocommit=true, attachment=dn1{SELECT *
  65.          FROMtravelrecord
  66.          ORDERBY id
  67.          LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@b47af37,writeQueue=0, modifiedSQLExecuted=false]
  68.          02/1417:52:33.884  DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:241) -on row end reseponse MySQLConnection [id=25,lastTime=1455443553868, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=227, charset=latin1, txIsolation=3,autocommit=true, attachment=dn3{SELECT *
  69.          FROMtravelrecord
  70.          ORDERBY id
  71.          LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=false]
  73.         02/1417:52:33.884  DEBUG [$_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]]
  74.          02/1417:52:33.884  DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=25,lastTime=1455443553868, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=227, charset=latin1, txIsolation=3,autocommit=true, attachment=dn3{SELECT *
  75.          FROMtravelrecord
  76.          ORDERBY id
  77.          LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=false]
  79.         02/1417:52:33.885  DEBUG [$_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]
  80.          02/1417:52:33.886  DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=19,lastTime=1455443553868, user=root, schema=db1, old shema=db1, borrowed=true,fromSlaveDB=false, threadId=220, charset=latin1, txIsolation=3,autocommit=true, attachment=dn1{SELECT *
  81.          FROMtravelrecord
  82.          ORDERBY id
  83.          LIMIT0, 1000100}, respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@b47af37,writeQueue=0, modifiedSQLExecuted=false]
  84.         02/1417:52:33.886  DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=19,lastTime=1455443553868, user=root, schema=db1, old shema=db1, borrowed=true,fromSlaveDB=false, threadId=220, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111, port=3317,statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
  85.          02/1417:52:33.886  DEBUG [$_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 *
  86.          FROMtravelrecord
  87.          ORDERBY id
  88.          LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=false]
  89.          02/1417:52:33.886  DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=42,lastTime=1455443553868, user=root, schema=db2, old shema=db2, borrowed=true,fromSlaveDB=false, threadId=234, charset=latin1, txIsolation=3,autocommit=true, attachment=dn2{SELECT *
  90.          FROMtravelrecord
  91.          ORDERBY id
  92.          LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
  93.         02/1417:52:33.886  DEBUG [$_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]
  94.          02/1417:52:33.887  DEBUG [BusinessExecutor5](DataMergeService.java:296) -prepare mpp merge result for select * fromtravelrecord order by id limit 1000000,100
  95.          02/1417:52:33.887  DEBUG [BusinessExecutor5](MultiNodeQueryHandler.java:324) -last packet id:8

路由里面是先查limit 0,1000000条。然后再查出limit 0,1000100条记录。在这个基础上查出100条（prepare mpp mergeresult for select * from travelrecord order by id limit 1000000,100），所以假设这个M=1000000越来越大，一次性拉的数据就越大，这样就越来越慢了，那么须要查询的数据就比較多

２结合Mycat日志。分析跨分片事务的运行过程。以一个正常的跨分片SQL的事务过程，以及,一个错误SQL为例（比方某个分片上主键冲突或其它ＳＱＬ错误，导致无法运行成功）分别加, 以说明

2.1 正常的跨分片事务分析

运行情况：

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

mycat.log日志显示：

  1.          02/1800:01:24.351  DEBUG [$_NIOREACTOR-1-RW](ServerQueryHandler.java:56) -ServerConnection [id=4, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]updateorder040302 set SN=concat(SN,'-mycat')
  2.         02/1800:01:24.356  DEBUG [$_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={
  3.             1 -> dn21{update order040302 setSN=concat(SN,'-mycat')}
  4.             2 -> dn22{update order040302 setSN=concat(SN,'-mycat')}
  5.          }rrs
  6.          02/1800:01:24.356  DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:82) -execute mutinode query update order040302 setSN=concat(SN,'-mycat')
  7.          02/1800:01:24.357  DEBUG [$_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$StatusSync@71a27302,writeQueue=0, modifiedSQLExecuted=true]
  8.          02/1800:01:24.358  DEBUG [$_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]
  9.          02/1800:01:24.359  DEBUG [$_NIOREACTOR-2-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=30,lastTime=1455724884356, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=200, charset=latin1, txIsolation=3,autocommit=true, attachment=dn22{update order040302 setSN=concat(SN,'-mycat')},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true]
  10.          02/1800:01:24.359  DEBUG [$_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]
  11.          02/1800:01:24.359  DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=7,lastTime=1455724884356, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=218, charset=latin1, txIsolation=3,autocommit=true, attachment=dn21{update order040302 setSN=concat(SN,'-mycat')}, respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=true]
  12.          02/1800:01:24.359  DEBUG [$_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]

分析结果：update语句是改动全部的节点上的数据，02/18 00:01:24.356处NonBlockingSession启动了分布式事务，以下就分别在02/18 00:01:24.359有2处 NonBlockingSession.java:229在dn21、dn22上面运行了2遍，大家看到在2个节点dn21和dn22都运行完毕后，才有(PhysicalDatasource.java:403)-release channel MySQLConnection開始关闭释放连接，也就是说等全部节点都运行完毕后才结束整个事务。

2.2 非正常的sql事务运行，有一处报错的情况下（失败经过）

  1.      准备数据。须要一个节点成功，一个节点失败，所以准备拿SN字段的长度来做实验。一个超过报错。一个没有超过不报错

2.2.1 查看表结构：

  1.  mysql>show create table order040302;
  2. +-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  3.          |Table       | Create Table                                                                                                                                                                                                                                                 |
  4. +-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  5.          |order040302 | CREATE TABLE `order040302` (
  6.            `ID` int(11) NOT NULL AUTO_INCREMENT,
  7.            `CODE` varchar(64) DEFAULT NULL,
  8.            `SN` varchar(64) DEFAULT NULL,
  9.            `CREATE_TIME` datetime DEFAULT NULL,
  10.            PRIMARY KEY (`ID`)
  11.          )ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4 |
  12. +-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  13.          1row in set (0.00 sec)
  15.   mysql>

改动数据，设置成如此，一会就能够update一个节点失败一个节点成功了，在ID=1的节点上由于长度超过64报错。而在ID=2的节点上面则长度小于64而正常运行：

  1. mysql> update order040302 set SN =concat('',SN,'___',SN) where ID=1;
  2.          QueryOK, 1 row affected (0.01 sec)
  3.          Rowsmatched: 1  Changed: 1  Warnings: 0
  5.  mysql>select length(t1.SN),t1.* from order040302 t1;
  6.          +---------------+----+------------+-------------------------------------------------------+---------------------+
  7.          |length(t1.SN) | ID | CODE       | SN                                                   | CREATE_TIME         |
  8.          +---------------+----+------------+-------------------------------------------------------+---------------------+
  9.          |            53 |  1 | 0-10000020 |beijing_03-10000020-mycat___beijing_03-10000020-mycat | 2016-02-13 00:40:27 |
  10.          |            26 |  2 | 1-10000020 |shanghai_10-10000020-mycat                            | 2016-02-1300:40:18 |
  11.          +---------------+----+------------+-------------------------------------------------------+---------------------+
  12.          2rows in set (0.00 sec)
  14. mysql>   update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN) ;

2.2.2 mycat.log日志例如以下：

  1.          02/2205:44:39.666  DEBUG [$_NIOREACTOR-0-RW](ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]updateorder040302 set SN = concat('fenpianyigechenggong_yigeshibai_',SN)
  2.         02/2205:44:39.821  DEBUG [$_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={
  3.             1 -> dn21{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)}
  4.             2 -> dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)}
  5.          }rrs
  6.          02/2205:44:39.827  DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:82) -execute mutinode query update order040302 setSN = concat('fenpianyigechenggong_yigeshibai_',SN)
  7.          02/2205:44:39.830  DEBUG [$_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$StatusSync@64b49aaa,writeQueue=0, modifiedSQLExecuted=true]
  8.          02/2205:44:39.831  DEBUG [$_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$StatusSync@306b3db1,writeQueue=0, modifiedSQLExecuted=true]
  9.          02/2205:44:39.831  DEBUG [$_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$StatusSync@64b49aaa,writeQueue=0, modifiedSQLExecuted=true]
  10.          02/2205:44:39.832  DEBUG [$_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]
  11.          02/2205:44:39.832  DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:truefrom MySQLConnection [id=12, lastTime=1456091079827, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=222, charset=latin1,txIsolation=3, autocommit=true, attachment=dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@1c70f0b1,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true]
  12.          02/2205:44:39.832   WARN [$_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
  13.          02/2205:44:39.833  DEBUG [$_NIOREACTOR-0-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=12,lastTime=1456091079827, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=222, charset=latin1, txIsolation=3,autocommit=true, attachment=dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@1c70f0b1,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true]
  14.         02/2205:44:39.834  DEBUG [$_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]
  15.          02/2205:44:39.835  DEBUG [$_NIOREACTOR-0-RW](MultiNodeHandler.java:194) -error all end ,clear session resource

从日志记录里面能够看出：[NIOREACTOR−3−RW]dn21节点失败。报错errDatatoolongforcolumn′SN′atrow1code:1406。[_NIOREACTOR-0-RW]节点dn22成功了，所以最后提示-error all end ,clear sessionresource，整个事务退出。清空当前会话资源，结论就是一个节点dn21失败。单节点回退。可是成功的节点dn22不会回退。这是怎么回事呢？查看运行后的数据结果例如以下：

  1.          mysql>select length(t1.SN),t1.* from order040302 t1;
  2.          +---------------+----+------------+------------------------------------------------------------+---------------------+
  3.          |length(t1.SN) | ID | CODE       | SN                                                        | CREATE_TIME         |
  4.          +---------------+----+------------+------------------------------------------------------------+---------------------+
  5.          |            53 |  1 | 0-10000020 |beijing_03-10000020-mycat___beijing_03-10000020-mycat      | 2016-02-13 00:40:27 |
  6.          |            58 |  2 | 1-10000020 |fenpianyigechenggong_yigeshibai_shanghai_10-10000020-mycat | 2016-02-1300:40:18 |
  7.          +---------------+----+------------+------------------------------------------------------------+---------------------+
  8.          2rows in set (0.06 sec)
  10.   mysql>  
  1. 可见，我这个不是事务，事务会全部一起回退的。
  3. mycat窗体中怎样开启事务？

2.3 怎样mysql窗体那样，在mycat窗体开启事务

2.3.1 开启事务，手动提交

  1.      mysql>set autocommit=0;
  2.      QueryOK, 0 rows affected (0.00 sec)
  4.      mysql>update order040302 set SN = concat('fenpianyigechenggong_yigeshibai_',SN) ;
  5.      ERROR1105 (HY000): Data too long for column 'SN' at row 1
  6.      mysql>commit;
  7.      ERROR1003 (HY000): Transaction error, need to rollback.
  8.      mysql>
  9.      mysql>select length(t1.SN),t1.* from order040302 t1;
  10.      ERROR1003 (HY000): Transaction error, need to rollback.Data too long for column 'SN'at row 1
  11.      mysql>
  12.      mysql>rollback;
  13.      QueryOK, 0 rows affected (0.01 sec)
  15.      mysql>
  16.      mysql>select length(t1.SN),t1.* from order040302 t1;
  17.      +---------------+----+------------+-------------------------------------------------------+---------------------+
  18.      |length(t1.SN) | ID | CODE       | SN                                                   | CREATE_TIME         |
  19.      +---------------+----+------------+-------------------------------------------------------+---------------------+
  20.      |            53 |  1 | 0-10000020 |beijing_03-10000020-mycat___beijing_03-10000020-mycat | 2016-02-13 00:40:27 |
  21.      |            26 |  2 | 1-10000020 |shanghai_10-10000020-mycat                            | 2016-02-1300:40:18 |
  22.      +---------------+----+------------+-------------------------------------------------------+---------------------+
  23.      2rows in set (0.09 sec)
  25.      mysql>

2.3.2 后台mycat.log日志例如以下，run失败信息例如以下：

  1.          02/2217:54:25.035  DEBUG [$_NIOREACTOR-1-RW](ServerQueryHandler.java:56) -ServerConnection [id=2, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=false, schema=TESTDB]updateorder040302 set SN = concat('fenpianyigechenggong_yigeshibai_',SN)
  2.         02/2217:54:25.187  DEBUG [$_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={
  3.             1 -> dn21{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)}
  4.             2 -> dn22{update order040302 set SN =concat('fenpianyigechenggong_yigeshibai_',SN)}
  5.          }rrs
  6.          02/2217:54:25.193  DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:82) -execute mutinode query update order040302 setSN = concat('fenpianyigechenggong_yigeshibai_',SN)
  7.          02/2217:54:25.195  DEBUG [$_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$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true]
  8.          02/2217:54:25.196  DEBUG [$_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$StatusSync@46e9d255,writeQueue=0, modifiedSQLExecuted=true]
  9.          02/2217:54:25.196  DEBUG [$_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$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true]
  10.          02/2217:54:25.196  DEBUG [$_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$StatusSync@46e9d255,writeQueue=0, modifiedSQLExecuted=true]
  11.          02/2217:54:25.197   WARN [$_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$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true] err Data too long for column 'SN' atrow 1 code:1406
  12.          02/2217:54:25.197  DEBUG [$_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]
  13.          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：

  1.          02/2217:57:17.432  DEBUG [$_NIOREACTOR-1-RW](ServerQueryHandler.java:56) -ServerConnection [id=2, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=false,schema=TESTDB]rollback
  2.          02/2217:57:17.434  DEBUG [$_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$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true]
  3.          02/2217:57:17.435  DEBUG [$_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]
  4.          02/2217:57:17.436  DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:361) -clear session resourcesorg.opencloudb.server.NonBlockingSession@4483dae0
  5.          02/2217:57:17.436  DEBUG [$_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$StatusSync@4ff5e91e,writeQueue=0, modifiedSQLExecuted=true]
  6.          02/2217:57:17.438  DEBUG [$_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]
  7.          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]
  8.          02/2217:57:17.439  DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=7,lastTime=1456134865193, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=278, charset=latin1, txIsolation=3,autocommit=false, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
  9.          02/2217:57:17.439  DEBUG [$_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]
  10.         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]

看到在运行update的时候，有报错信息：在dn21节点上面err Data too long forcolumn ‘SN’ at row 1 code:1406，所以依照理论上不论什么节点错误发生了，就面临rollback的错误信息，不论什么不论什么都会提示报错信息。仅仅能运行rollback来恢复。PS：这里眼下的mycat版本号没有办法做到在update失败后自己主动rollback，须要手动rollback操作。

３创建一个在多个分片上存在的存储过程。存储过程能够是统计某个表的记录个数并返回。然后用Mycat注解方式完毕调用

3.1准备好的简单的存储过程

  1.          DELIMITER$$
  2.          CREATE
  3.                    PROCEDUREdb3.pro_select()
  4.                    BEGIN
  5.                             SELECTCOUNT(1) FROM order040302;
  6.                    END$$
  7.          DELIMITER;

3.2在各mysql节点上运行创建存储过程

dn21节点上的mysql窗体上：

  1.          mysql>DELIMITER $$
  2.          mysql>CREATE
  3.                    ->     PROCEDURE `db3`.`pro_select`()
  4.                    ->     BEGIN
  5.                    ->SELECT COUNT(1) FROM order040302;
  6.                    ->     END$$
  7.          QueryOK, 0 rows affected (0.01 sec)
  9.          mysql>DELIMITER ;
  10.          mysql>

dn22节点上的mysql窗体上：

  1.          mysql>DELIMITER $$
  2.          mysql>CREATE
  3.                    ->     PROCEDURE `db3`.`pro_select`()
  4.                    ->     BEGIN
  5.                    ->SELECT COUNT(1) FROM order040302;
  6.                    ->     END$$
  7.          QueryOK, 0 rows affected (0.01 sec)
  9.          mysql>DELIMITER ;
  10.          mysql>

检查存储过程：

  1.          mysql>select * from information_schema.ROUTINES\G
  2.          ***************************1. row ***************************
  3.                                SPECIFIC_NAME: pro_select
  4.                              ROUTINE_CATALOG: def
  5.                               ROUTINE_SCHEMA: db3
  6.                                      ROUTINE_NAME:pro_select
  7.                                      ROUTINE_TYPE:PROCEDURE
  8.                                         DATA_TYPE:
  9.          CHARACTER_MAXIMUM_LENGTH:NULL
  10.            CHARACTER_OCTET_LENGTH: NULL
  11.                       NUMERIC_PRECISION: NULL
  12.                                NUMERIC_SCALE: NULL
  13.                      DATETIME_PRECISION: NULL
  14.                      CHARACTER_SET_NAME: NULL
  15.                               COLLATION_NAME: NULL
  16.                               DTD_IDENTIFIER: NULL
  17.                                      ROUTINE_BODY:SQL
  18.                      ROUTINE_DEFINITION: BEGIN
  19.          SELECTCOUNT(1) FROM order040302;
  20.                    END
  21.                                EXTERNAL_NAME: NULL
  22.                       EXTERNAL_LANGUAGE: NULL
  23.                              PARAMETER_STYLE: SQL
  24.                             IS_DETERMINISTIC: NO
  25.                              SQL_DATA_ACCESS: CONTAINS SQL
  26.                                                SQL_PATH:NULL
  27.                                SECURITY_TYPE: DEFINER
  28.                                                 CREATED: 2016-02-22 19:17:12
  29.                                      LAST_ALTERED:2016-02-22 19:17:12
  30.                                                SQL_MODE:STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION
  31.                              ROUTINE_COMMENT:
  32.                                                 DEFINER: root@localhost
  33.                    CHARACTER_SET_CLIENT:latin1
  34.                    COLLATION_CONNECTION:latin1_swedish_ci
  35.                      DATABASE_COLLATION: utf8mb4_general_ci
  36.          1row in set (0.00 sec)
  38.          mysql>

然后在mycat中运行：

  1.          mysql>/*!mycat:sql=select * from order040302 where ID=2*/ call pro_select();
  2.          +----------+
  3.          |COUNT(1) |
  4.          +----------+
  5.          |        1 |
  6.          |        1 |
  7.          +----------+
  8.          2rows in set (0.01 sec)
  10.          QueryOK, 0 rows affected (0.01 sec)
  12.          mysql>

问题，为啥是2行记录，不知道能够不能够并成一行记录呢？

普通sql到了最后会有例如以下：

  1. 02/23 00:07:21.478  DEBUG [BusinessExecutor0] (DataMergeService.java:296) -prepare mpp merge result for select count(*) from order040302
  2. 02/23 00:07:21.479  DEBUG [BusinessExecutor0] (MultiNodeQueryHandler.java:324) -last packet id:5

的聚合操作，有了这个merge result操作后，就会把2条记录变成一条记录。可是mycat注解后的运行sql显示注解后，没有这一个merge result的操作，所以是2条记录。

哇塞。我好伟大，发现了当中的差别，可是那么新问题来了，怎么完好注解后生成的2条记录变成为1条记录额？

3.3看后台mycat.log日志：

看到日志中42.293记录。走的route路由进入dn21和dn22节点上面，终于运行的是注解的-execute mutinode query select * from order040302。例如以下所看到的：

  1. 02/22 20:19:42.292  DEBUG [$_NIOREACTOR-1-RW](ServerQueryHandler.java:56) -ServerConnection [id=10, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true,schema=TESTDB]/*!mycat:sql=select * from order040302*/ call pro_select()
  2.          02/22 20:19:42.293  DEBUG [$_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={
  3.             1 -> dn21{call pro_select()}
  4.             2 -> dn22{call pro_select()}
  5.          } rrs
  6.          02/22 20:19:42.293  DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:82) -execute mutinode query select * fromorder040302
  7.          02/2220:19:42.295  DEBUG [$_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$StatusSync@939bc30,writeQueue=0, modifiedSQLExecuted=true]
  8.          02/2220:19:42.295  DEBUG [$_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]
  9.          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]
  10.          02/2220:19:42.296  DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:280) -last packet id:6
  11.          02/2220:19:42.295  DEBUG [$_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]
  12.          02/2220:19:42.296  DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:truefrom MySQLConnection [id=4, lastTime=1456143582284, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=280, charset=latin1,txIsolation=3, autocommit=true, attachment=dn21{call pro_select()},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@ba5d1a4,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=true]
  13.          02/2220:19:42.296  DEBUG [$_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]
  14.          02/2220:19:42.296  DEBUG [$_NIOREACTOR-0-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=4,lastTime=1456143582284, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=280, charset=latin1, txIsolation=3,autocommit=true, attachment=dn21{call pro_select()},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@ba5d1a4,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=true]
  15.         02/2220:19:42.296  DEBUG [$_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]
  16.          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**重点内容**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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