deadlock-found-when-trying-to-get-lock

mysql锁机制分为表级锁和行级锁：

共享锁又称为读锁，简称S锁，顾名思义，共享锁就是多个事务对于同一数据可以共享一把锁，都能访问到数据，但是只能读不能修改。

排他锁又称为写锁，简称X锁，顾名思义，排他锁就是不能与其他所并存，如一个事务获取了一个数据行的排他锁，其他事务就不能再获取该行的其他锁，包括共享锁和排他锁，但是获取排他锁的事务是可以对数据就行读取和修改。

对于共享锁大家可能很好理解，就是多个事务只能读数据不能改数据，对于排他锁大家的理解可能就有些差别，我当初就犯了一个错误，以为排他锁锁住一行数据后，其他事务就不能读取和修改该行数据，其实不是这样的。排他锁指的是一个事务在一行数据加上排他锁后，其他事务不能再在其上加其他的锁。mysql InnoDB引擎默认的修改数据语句，update,delete,insert都会自动给涉及到的数据加上排他锁，select语句默认不会加任何锁类型，如果加排他锁可以使用select …for update语句，加共享锁可以使用select … lock in share mode语句。所以加过排他锁的数据行在其他事务种是不能修改数据的，也不能通过for update和lock in share mode锁的方式查询数据，但可以直接通过select …from…查询数据，因为普通查询没有任何锁机制。

案发现场

API网关在30ms内收到6次相同请求，错误日志：

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Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.754 [http-apr- 8080-exec- 1379] INFO h .a .a .f .AppPlatformRateLimiterFilter - parameter=_appCrypt_=VDzT76Hdrp9QAO4lSbQuJeIaKnQ8VZnqljK+YmN2W1tyBSv1JqIhTrDHrBlWM9K8yg3kcLOUmENr1OUc+ 6xWSL13Z2jaBhCJDrMYWad/H971ilDd4eQMrakZP84dCbXC&_t_=HBStockWarningIos_3. 6.4&ticket= 7.BdzpPOeP2_7JV6IYArPBIOC36NO2PoCMhVPHiISIEM_tAo7-unTlp_baBhZ79TZskD-HBIBmSnk- 7y_tv24wD2IiSgTHlj7x5DTHEV7CacwVdw9jmTCuVdePd4mUaM11k5XGRSsPzqzQmomKMu7aGm8R48Nq-ECE7WpSNtQmExU& Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.756 [http-apr- 8080-exec- 1379] INFO sky .app .api .filter .RateLimiter - userId: 3245964, 在 5s 内第 1次 执行操作 http: Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.756 [http-apr- 8080-exec- 1319] INFO sky .app .api .filter .RateLimiter - userId: 3245964, 在 5s 内第 2次 执行操作 http: Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.757 [http-apr- 8080-exec- 1319] DEBUG h .p .commons .web .HbecApiHandleAdapter - param-sha1 : null, appCrypt< 1> : VDzT76Hdrp9QAO4lSbQuJeIaKnQ8VZnqljK+YmN2W1tyBSv1JqIhTrDHrBlWM9K8yg3kcLOUmENr1OUc+ 6xWSL13Z2jaBhCJDrMYWad/H971ilDd4eQMrakZP84dCbXC, dataKey=l7g19q1 $g#*o9v- 1 Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.755 [http-apr- 8080-exec- 1414] INFO h .a .a .f .AppPlatformRateLimiterFilter - http request=http: //api.*.com/followStockService.follow Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.755 [http-apr- 8080-exec- 1414] INFO h .a .a .f .AppPlatformRateLimiterFilter - Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.757 [http-apr- 8080-exec- 1414] INFO sky .app .api .filter .RateLimiter - userId: 3245964, 在 5s 内第 3次 执行操作 http: Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.756 [http-apr- 8080-exec- 1457] INFO h .a .a .f .AppPlatformRateLimiterFilter - http request=http: //api.*.com/followStockService.follow Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.756 [http-apr- 8080-exec- 1457] INFO h .a .a .f .AppPlatformRateLimiterFilter - Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.757 [http-apr- 8080-exec- 1457] INFO sky .app .api .filter .RateLimiter - userId: 3245964, 在 5s 内第 4次 执行操作 http: Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.757 [http-apr- 8080-exec- 1334] INFO h .a .a .f .AppPlatformRateLimiterFilter - http request=http: //api.*.com/followStockService.follow Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.757 [http-apr- 8080-exec- 1334] INFO h .a .a .f .AppPlatformRateLimiterFilter - parameter=_appCrypt_=VDzT76Hdrp9QAO4lSbQuJeIaKnQ8VZnqljK+YmN2W1tyBSv1JqIhTrDHrBlWM9K8yg3kcLOUmENr1OUc+ 6xWSL13Z2jaBhCJDrMYWad/H971ilDd4eQMrakZP84dCbXC&_t_=HBStockWarningIos_3. 6.4&ticket= 7.BdzpPOeP2_7JV6IYArPBIOC36NO2PoCMhVPHiISIEM_tAo7-unTlp_baBhZ79TZskD-HBIBmSnk- 7y_tv24wD2IiSgTHlj7x5DTHEV7CacwVdw9jmTCuVdePd4mUaM11k5XGRSsPzqzQmomKMu7aGm8R48Nq-ECE7WpSNtQmExU& Jul 23 17: 12: 50 iZ23qpg65e4Z api_qianqian1 2017- 07- 23 17: 12: 50.759 [http-apr- 8080-exec- 1334] INFO sky .app .api .filter .RateLimiter - userId: 3245964, 在 5s 内第 5次 执行操作 http:

业务日志

追踪到业务节点后，发现mysql出现死锁问题：Deadlock found when trying to get lock; try restarting transaction

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Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 17-07-23 17: 12: 50. 779 ERROR[DubboServerHandler-10. 253. 17. 105: 20880-thread-193 DbService.execute: 1247] {} Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 sky.platform.commons.exceptions.HbecDbServiceException: service=db,message=sky.platform.commons.exceptions.HbecDbServiceException: service=db,message= Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### The error may involve WarnFollowMapper.follow-Inline Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### The error occurred while setting parameters Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### SQL: insert into test_follow (user_id, security_type, stock_code, exchange, stock_name, sub_fund_type, sort) values (?, ?, ?, ?,?, ?, (select max(IFNULL(t1.sort,0)) + 1 from test_FOLLOW t1 where t1.user_id = ?) ) on duplicate key update sort= (select max(IFNULL(t2.sort,0)) + 1 from test_follow t2 where t2.user_id= ?) Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.platform.runtime.DbServiceInterceptor$ 1.execute(DbServiceInterceptor. java:39) ~[hbec-platform-commons-0. 0. 32-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.platform.runtime.DbService.execute(DbService. java:1242) ~[hbec-platform-commons-0. 0. 32-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.platform.runtime.DbServiceInterceptor.intercept(DbServiceInterceptor. java:33) [hbec-platform-commons-0. 0. 32-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.app.stock.follow.service.impl.WarnFollowServiceImpl$$EnhancerByCGLIB$$ 41e28e09.follow(<generated>) [spring-core-4. 0. 2.RELEASE. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.app.stock.follow.controller.impl.FollowStockControllerImpl.follow(FollowStockControllerImpl. java:304) [hbec-app-stock-follow-1. 0. 2-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.common. bytecode.Wrapper94.invokeMethod(Wrapper94.java) [na: 2. 5. 3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.proxy. javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:46) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker. java:72) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper. java:53) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter. java:64) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$ 1.invoke(ProtocolFilterWrapper. java:91) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter. java:42) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$ 1.invoke(ProtocolFilterWrapper. java:91) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter. java:75) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$ 1.invoke(ProtocolFilterWrapper. java:91) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter. java:78) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$ 1.invoke(ProtocolFilterWrapper. java:91) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.app.eagleeye.dubbo.EagleeyeFilter.invoke(EagleeyeFilter. java:155) [hbec-platform-runtime-app-0. 0. 32-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$ 1.invoke(ProtocolFilterWrapper. java:91) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter. java:60) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$ 1.invoke(ProtocolFilterWrapper. java:91) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter. java:112) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$ 1.invoke(ProtocolFilterWrapper. java:91) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter. java:38) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$ 1.invoke(ProtocolFilterWrapper. java:91) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter. java:38) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$ 1.invoke(ProtocolFilterWrapper. java:91) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$ 1.reply(DubboProtocol. java:108) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler. java:84) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler. java:170) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler. java:52) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.alibaba.dubbo.remoting.transport. dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:82) [dubbo-2. 5. 3. jar:2.5.3] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na: 1. 7. 0_55] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na: 1. 7. 0_55] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at java.lang.Thread.run(Thread.java:745) [na: 1. 7. 0_55] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 Caused by: java.lang.RuntimeException: sky.platform.commons.exceptions.HbecDbServiceException: service=db,message= Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### The error may involve WarnFollowMapper.follow-Inline Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### The error occurred while setting parameters Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### SQL: insert into test_follow (user_id, security_type, stock_code, exchange, stock_name, sub_fund_type, sort) values (?, ?, ?, ?,?, ?, (select max(IFNULL(t1.sort,0)) + 1 from test_FOLLOW t1 where t1.user_id = ?) ) on duplicate key update sort= (select max(IFNULL(t2.sort,0)) + 1 from test_follow t2 where t2.user_id= ?) Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.app.stock.follow.repository.impl.WarnFollowRepository.follow(WarnFollowRepository. java:238) ~[hbec-app-stock-follow-1. 0. 2-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.app.stock.follow.service.impl.WarnFollowServiceImpl.follow(WarnFollowServiceImpl. java:87) ~[hbec-app-stock-follow-1. 0. 2-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.app.stock.follow.service.impl.WarnFollowServiceImpl$$EnhancerByCGLIB$$ 41e28e09.CGLIB$follow$ 0(<generated>) [spring-core-4. 0. 2.RELEASE. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.app.stock.follow.service.impl.WarnFollowServiceImpl$$EnhancerByCGLIB$$ 41e28e09$$FastClassByCGLIB$$cf 1f7d 1b.invoke(<generated>) ~[spring-core-4. 0. 2.RELEASE. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4. 0. 2.RELEASE. jar:4.0.2.RELEASE] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.platform. 大专栏   deadlock-found-when-trying-to-get-lockruntime.DbServiceInterceptor$ 1.execute(DbServiceInterceptor. java:37) ~[hbec-platform-commons-0. 0. 32-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ... 34 common frames omitted Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 Caused by: sky.platform.commons.exceptions.HbecDbServiceException: service=db,message= Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### The error may involve WarnFollowMapper.follow-Inline Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### The error occurred while setting parameters Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### SQL: insert into test_follow (user_id, security_type, stock_code, exchange, stock_name, sub_fund_type, sort) values (?, ?, ?, ?,?, ?, (select max(IFNULL(t1.sort,0)) + 1 from test_FOLLOW t1 where t1.user_id = ?) ) on duplicate key update sort= (select max(IFNULL(t2.sort,0)) + 1 from test_follow t2 where t2.user_id= ?) Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.platform.runtime.DbService.myInsert(DbService. java:2345) ~[hbec-platform-commons-0. 0. 32-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.app.stock.follow.repository.impl.WarnFollowRepository.follow(WarnFollowRepository. java:236) ~[hbec-app-stock-follow-1. 0. 2-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ... 39 common frames omitted Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 Caused by: org.apache.ibatis.exceptions.PersistenceException: Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### The error may involve WarnFollowMapper.follow-Inline Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### The error occurred while setting parameters Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### SQL: insert into test_follow (user_id, security_type, stock_code, exchange, stock_name, sub_fund_type, sort) values (?, ?, ?, ?,?, ?, (select max(IFNULL(t1.sort,0)) + 1 from test_FOLLOW t1 where t1.user_id = ?) ) on duplicate key update sort= (select max(IFNULL(t2.sort,0)) + 1 from test_follow t2 where t2.user_id= ?) Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26) ~[mybatis-3. 2. 8. jar:3.2.8] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:154) ~[mybatis-3. 2. 8. jar:3.2.8] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:141) ~[mybatis-3. 2. 8. jar:3.2.8] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sky.platform.runtime.DbService.myInsert(DbService. java:2331) ~[hbec-platform-commons-0. 0. 32-SNAPSHOT. jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ... 40 common frames omitted Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 Caused by: com.mysql. jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock ; try restarting transaction Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na: 1. 7. 0_55] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl. java:57) ~[na: 1. 7. 0_55] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl. java:45) ~[na: 1. 7. 0_55] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at java.lang.reflect.Constructor.newInstance(Constructor.java:526) ~[na: 1. 7. 0_55] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.mysql. jdbc.Util.handleNewInstance(Util.java:411) ~[mysql-connector- java-5.1.28.jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.mysql. jdbc.Util.getInstance(Util.java:386) ~[mysql-connector- java-5.1.28.jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.mysql. jdbc.SQLError.createSQLException(SQLError.java:1066) ~[mysql-connector- java-5.1.28.jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.mysql. jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237) ~[mysql-connector- java-5.1.28.jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.mysql. jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169) ~[mysql-connector- java-5.1.28.jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.mysql. jdbc.MysqlIO.sendCommand(MysqlIO.java:2617) ~[mysql-connector- java-5.1.28.jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.mysql. jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2778) ~[mysql-connector- java-5.1.28.jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.mysql. jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2825) ~[mysql-connector- java-5.1.28.jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.mysql. jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2156) ~[mysql-connector- java-5.1.28.jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.mysql. jdbc.PreparedStatement.execute(PreparedStatement.java:1379) ~[mysql-connector- java-5.1.28.jar:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sun.reflect.GeneratedMethodAccessor199.invoke(Unknown Source) ~[na:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl. java:43) ~[na: 1. 7. 0_55] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at java.lang.reflect.Method.invoke(Method.java:606) ~[na: 1. 7. 0_55] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:62) ~[mybatis-3. 2. 8. jar:3.2.8] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at com.sun.proxy.$Proxy28.execute(Unknown Source) ~[na:na] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:44) ~[mybatis-3. 2. 8. jar:3.2.8] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:69) ~[mybatis-3. 2. 8. jar:3.2.8] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:48) ~[mybatis-3. 2. 8. jar:3.2.8] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:105) ~[mybatis-3. 2. 8. jar:3.2.8] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:71) ~[mybatis-3. 2. 8. jar:3.2.8] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:152) ~[mybatis-3. 2. 8. jar:3.2.8] Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 ... 42 common frames omitted Jul 23 17: 12: 50 iZ2360o6lpyZ warn1 17-07-23 17: 12: 50. 780 DEBUG[DubboServerHandler-10. 253. 17. 105: 20880-thread-192 follow.debug: 139]MYBATIS <== Updates: 2

查看数据库引擎状态

1	show engine innodb status

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

------------------------ LATEST DETECTED DEADLOCK ------------------------ 2017- 07- 23 17: 13: 58 2afc664c2700 *** ( 1) TRANSACTION: TRANSACTION 730441984, ACTIVE 0.003 sec inserting mysql tables in use 3, locked 3 LOCK WAIT 8 lock struct(s), heap size 2936, 37 row lock(s), undo log entries 1 LOCK BLOCKING MySQL thread id: 12246957 block 12256080 MySQL thread id 12256080, OS thread handle 0x2afc48c40700, query id 3543571324 10.253. 17.105 test_app Sending data insert into test_follow (user_id, security_type, stock_code, exchange, stock_name, sub_fund_type, sort) values ( 3245964, 4, '601318', 'SH', '中国平安', null, ( select max(IFNULL(t1.sort, 0)) + 1 from test_FOLLOW t1 where t1.user_id = 3245964) ) on duplicate key update sort= ( select max(IFNULL(t2.sort, 0)) + 1 from test_follow t2 where t2.user_id= 3245964) *** ( 1) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 1198 page no 842 n bits 696 index `unique_index` of table `wndb`.`test_follow` trx id 730441984 lock_mode X waiting Record lock, heap no 624 PHYSICAL RECORD: n_fields 4; compact format; info bits 0 0: len 4; hex 8031878c; asc 1 ;; 1: len 1; hex 84; asc ;; 2: len 6; hex 363031333138; asc 601318;; 3: len 4; hex 800399cb; asc ;; *** ( 2) TRANSACTION: TRANSACTION 730441985, ACTIVE 0.001 sec inserting mysql tables in use 3, locked 3 8 lock struct(s), heap size 2936, 37 row lock(s), undo log entries 1 MySQL thread id 12246957, OS thread handle 0x2afc664c2700, query id 3543571329 10.253. 17.105 test_app Sending data insert into test_follow (user_id, security_type, stock_code, exchange, stock_name, sub_fund_type, sort) values ( 3245964, 4, '601318', 'SH', '中国平安', null, ( select max(IFNULL(t1.sort, 0)) + 1 from test_FOLLOW t1 where t1.user_id = 3245964) ) on duplicate key update sort= ( select max(IFNULL(t2.sort, 0)) + 1 from test_follow t2 where t2.user_id= 3245964) *** ( 2) HOLDS THE LOCK(S): RECORD LOCKS space id 1198 page no 842 n bits 696 index `unique_index` of table `wndb`.`test_follow` trx id 730441985 lock mode S locks rec but not gap Record lock, heap no 624 PHYSICAL RECORD: n_fields 4; compact format; info bits 0 0: len 4; hex 8031878c; asc 1 ;; 1: len 1; hex 84; asc ;; 2: len 6; hex 363031333138; asc 601318;; 3: len 4; hex 800399cb; asc ;; *** ( 2) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 1198 page no 842 n bits 696 index `unique_index` of table `wndb`.`test_follow` trx id 730441985 lock_mode X waiting Record lock, heap no 624 PHYSICAL RECORD: n_fields 4; compact format; info bits 0 0: len 4; hex 8031878c; asc 1 ;; 1: len 1; hex 84; asc ;; 2: len 6; hex 363031333138; asc 601318;; 3: len 4; hex 800399cb; asc ;; *** WE ROLL BACK TRANSACTION ( 2)

从中可以看到两个事务在等待X锁

1 2 3 4 5 6 7 8 9 10 11

WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 1198 page no 842 n bits 696 index `unique_index` of table `wndb`. `test_follow` trx id 730441984 lock_mode X waiting Record lock ( 2) HOLDS THE LOCK(S): RECORD LOCKS space id 1198 page no 842 n bits 696 index `unique_index` of table `wndb`. `test_follow` trx id 730441985 lock mode S locks rec but not gap Record lock, heap no 624 PHYSICAL RECORD ( 2) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 1198 page no 842 n bits 696 index `unique_index` of table `wndb`. `test_follow` trx id 730441985 lock_mode X waiting Record lock, heap no 624 PHYSICAL RECORD

重现

1.准备工作

• 同时开启三个command prompt，远程连接mysql服务器：mysql -uroc -proc -h10.0.30.59 wndb
• 关闭自动提交：set autocommit=0

2.模拟请求

Session A

1 2 3

begin; insert into test_follow (user_id, security_type, stock_code, exchange, stock_name, sub_fund_type, sort) values ( 3245964, 4, '600628', 'SH', '新世界', null, ( select max( IFNULL(t1.sort, 0)) + 1 from test_FOLLOW t1 where t1.user_id = 3245964) ) on duplicate key update sort= ( select max( IFNULL(t2.sort, 0)) + 1 from test_follow t2 where t2.user_id= 3245964);

Session B

1 2 3

begin; insert into test_follow (user_id, security_type, stock_code, exchange, stock_name, sub_fund_type, sort) values ( 3245964, 4, '600628', 'SH', '新世界', null, ( select max( IFNULL(t1.sort, 0)) + 1 from test_FOLLOW t1 where t1.user_id = 3245964) ) on duplicate key update sort= ( select max( IFNULL(t2.sort, 0)) + 1 from test_follow t2 where t2.user_id= 3245964);

Session C

1 2 3

begin; insert into test_follow (user_id, security_type, stock_code, exchange, stock_name, sub_fund_type, sort) values ( 3245964, 4, '600628', 'SH', '新世界', null, ( select max( IFNULL(t1.sort, 0)) + 1 from test_FOLLOW t1 where t1.user_id = 3245964) ) on duplicate key update sort= ( select max( IFNULL(t2.sort, 0)) + 1 from test_follow t2 where t2.user_id= 3245964);

commit Session A，session B与session C竞争X锁，直接报错:

解决

首先这是个添加操作，APP端不应该对同一用户、同一只股票执行多次并发添加操作
，APP端需要解决单设备、多并发问题。后台针对同一用户、同一股票的添加操作，需要使用分布式锁控制并发。