Netty处理比较耗时的事务应该放在哪里

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探讨了在Netty框架中如何有效地处理耗时较长的事务,参考了知乎上的相关问题,内容涉及Netty的异步特性及其在处理此类事务时的最佳实践。

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2025-07-24 04:12:11.345 [jersey-server-managed-async-executor-7] ERROR druid.sql.Statement - {conn-10028, pstmt-363663} execute error. INSERT INTO tkp_punch_card ( id,dept_id,line_id,person_archives_id,serial_number,team_id,card_type,card_time,attendance_time,card_location,card_attendance,card_status,create_time,create_user,alcoholdegree,update_alcoholdegree_time,highpressure,lowpressure,update_pressure_time,position_mileage ) VALUES( ?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,? ) com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) at com.mysql.jdbc.Util.getInstance(Util.java:408) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:951) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3970) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3906) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2524) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2677) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861) at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1192) at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3051) at com.alibaba.druid.wall.WallFilter.preparedStatement_execute(WallFilter.java:619) at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3049) at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440) at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3049) at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.execute(PreparedStatementProxyImpl.java:167) at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:498) at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:59) at com.sun.proxy.$Proxy73.execute(Unknown Source) at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:46) at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74) at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50) at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117) at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76) at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:198) at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:185) at sun.reflect.GeneratedMethodAccessor100.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433) at com.sun.proxy.$Proxy28.insert(Unknown Source) at org.mybatis.spring.SqlSessionTemplate.insert(SqlSessionTemplate.java:278) at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:58) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59) at com.sun.proxy.$Proxy36.insert(Unknown Source) at com.tkp.attendancemachine.modules.service.AttendancemachineService.getuserbyids(AttendancemachineService.java:445) at com.tkp.attendancemachine.modules.controller.AttendancemachineResource.getuserbyids(AttendancemachineResource.java:40) at sun.reflect.GeneratedMethodAccessor98.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:76) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:147) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:190) at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:243) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:102) at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:493) at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:415) at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:104) at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:277) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) at org.glassfish.jersey.internal.Errors.process(Errors.java:315) at org.glassfish.jersey.internal.Errors.process(Errors.java:297) at org.glassfish.jersey.internal.Errors.process(Errors.java:267) at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:289) at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:256) at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:703) at org.glassfish.jersey.netty.httpserver.JerseyServerHandler$1.run(JerseyServerHandler.java:115) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:748) 2025-07-24 04:12:11.346 [jersey-server-managed-async-executor-7] ERROR com.tkp.attendancemachine.modules.controller.AttendancemachineResource - com.tkp.attendancemachine.modules.controller.AttendancemachineResource org.springframework.dao.CannotAcquireLockException: ### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction ### The error may involve com.tkp.attendancemachine.modules.mapper.PunchCardMapper.insert-Inline ### The error occurred while setting parameters ### SQL: INSERT INTO tkp_punch_card ( id,dept_id,line_id,person_archives_id,serial_number,team_id,card_type,card_time,attendance_time,card_location,card_attendance,card_status,create_time,create_user,alcoholdegree,update_alcoholdegree_time,highpressure,lowpressure,update_pressure_time,position_mileage ) VALUES( ?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,? ) ### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction ; SQL []; Lock wait timeout exceeded; try restarting transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:259) at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73) at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446) at com.sun.proxy.$Proxy28.insert(Unknown Source) at org.mybatis.spring.SqlSessionTemplate.insert(SqlSessionTemplate.java:278) at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:58) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59) at com.sun.proxy.$Proxy36.insert(Unknown Source) at com.tkp.attendancemachine.modules.service.AttendancemachineService.getuserbyids(AttendancemachineService.java:445) at com.tkp.attendancemachine.modules.controller.AttendancemachineResource.getuserbyids(AttendancemachineResource.java:40) at sun.reflect.GeneratedMethodAccessor98.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:76) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:147) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:190) at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:243) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:102) at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:493) at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:415) at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:104) at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:277) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) at org.glassfish.jersey.internal.Errors.process(Errors.java:315) at org.glassfish.jersey.internal.Errors.process(Errors.java:297) at org.glassfish.jersey.internal.Errors.process(Errors.java:267) at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:289) at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:256) at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:703) at org.glassfish.jersey.netty.httpserver.JerseyServerHandler$1.run(JerseyServerHandler.java:115) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:748) Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) at com.mysql.jdbc.Util.getInstance(Util.java:408) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:951) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3970) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3906) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2524) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2677) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861) at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1192) at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3051) at com.alibaba.druid.wall.WallFilter.preparedStatement_execute(WallFilter.java:619) at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3049) at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440) at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3049) at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.execute(PreparedStatementProxyImpl.java:167) at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:498) at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:59) at com.sun.proxy.$Proxy73.execute(Unknown Source) at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:46) at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74) at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50) at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117) at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76) at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:198) at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:185) at sun.reflect.GeneratedMethodAccessor100.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433) ... 31 common frames omitted 2025-07-24 04:12:33.668 [jersey-server-managed-async-executor-6] ERROR druid.sql.Statement - {conn-10030, pstmt-363669} execute error. INSERT INTO tkp_punch_card ( id,dept_id,line_id,person_archives_id,serial_number,team_id,card_type,card_time,attendance_time,card_location,card_attendance,card_status,create_time,create_user,alcoholdegree,update_alcoholdegree_time,highpressure,lowpressure,update_pressure_time,position_mileage ) VALUES( ?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,? ) com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) at com.mysql.jdbc.Util.getInstance(Util.java:408) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:951) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3970) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3906) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2524) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2677) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861) at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1192) at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3051) at com.alibaba.druid.wall.WallFilter.preparedStatement_execute(WallFilter.java:619) at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3049) at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440) at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3049) at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.execute(PreparedStatementProxyImpl.java:167) at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:498) at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:59) at com.sun.proxy.$Proxy73.execute(Unknown Source) at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:46) at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74) at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50) at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117) at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76) at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:198) at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:185) at sun.reflect.GeneratedMethodAccessor100.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433) at com.sun.proxy.$Proxy28.insert(Unknown Source) at org.mybatis.spring.SqlSessionTemplate.insert(SqlSessionTemplate.java:278) at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:58) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59) at com.sun.proxy.$Proxy36.insert(Unknown Source) at com.tkp.attendancemachine.modules.service.AttendancemachineService.getuserbyids(AttendancemachineService.java:445) at com.tkp.attendancemachine.modules.controller.AttendancemachineResource.getuserbyids(AttendancemachineResource.java:40) at sun.reflect.GeneratedMethodAccessor98.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:76) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:147) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:190) at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:243) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:102) at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:493) at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:415) at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:104) at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:277) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) at org.glassfish.jersey.internal.Errors.process(Errors.java:315) at org.glassfish.jersey.internal.Errors.process(Errors.java:297) at org.glassfish.jersey.internal.Errors.process(Errors.java:267) at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:289) at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:256) at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:703) at org.glassfish.jersey.netty.httpserver.JerseyServerHandler$1.run(JerseyServerHandler.java:115) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:748)
最新发布
07-25
<think>我们正在处理MySQL事务回滚异常,具体是"Lock wait timeout exceeded; try restarting transaction"。根据引用内容,这个问题通常在高并发场景下出现,由于数据库锁等待超时(默认50秒)导致。下面我将逐步分析并提供解决方案。 ### 问题分析 1. **根本原因**:在事务中,某个操作(如更新或删除)持有了表的锁,而另一个并发事务也需要访问同一资源,导致锁等待。如果等待时间超过`innodb_lock_wait_timeout`设置(默认50秒),就会抛出此异常。 2. 引用[3]中给出了一个典型场景:在一个事务方法`methodA`中,先调用了`methodB`(删除B表数据,持有锁),然后在新线程中调用`methodC`(也需要写B表)。由于Spring事务与线程绑定,新线程会开启新事务,而原事务未提交,导致新事务等待锁超时。 ### 解决方案 #### 1. 临时解决:终止阻塞的事务 通过SQL查询当前阻塞的事务,并终止它们: ```sql -- 查找正在运行的事务(特别是锁等待时间长的) SELECT * FROM information_schema.innodb_trx; -- 根据查询结果,找到阻塞其他事务的trx_mysql_thread_id,然后终止 KILL [trx_mysql_thread_id]; ``` 注意:此方法只是临时解决,需要后续优化代码避免再次发生。 #### 2. 优化事务设计 - **缩短事务执行时间**:确保事务内的操作尽可能快,避免长时间持有锁。例如,不要将耗时操作(如网络请求、复杂计算)放在事务中。 - **按固定顺序访问资源**:多个事务对同一组资源进行操作时,按相同顺序访问,避免循环等待。 - **避免大事务**:将大事务拆分为多个小事务,减少锁持有时间。 #### 3. 调整超时时间(谨慎使用) 临时调整锁等待超时时间(以秒为单位): ```sql SET GLOBAL innodb_lock_wait_timeout=120; -- 设置为120秒 ``` 但注意:这只是延长超时时间,并没有真正解决问题,可能掩盖问题。 #### 4. 代码层面优化(针对引用[3]的场景) - **避免在事务中开启新线程操作同一张表**:如果必须多线程,确保子线程的操作不依赖父事务的资源,或者将子线程的操作移到父事务提交之后。 - **使用编程式事务管理**:在需要的时候精确控制事务边界,避免不必要的长事务。 #### 5. 检查索引 确保经常被更新的列有合适的索引,因为锁冲突常发生在没有索引的情况下(全表扫描会锁住整个表)。 #### 6. 隔离级别调整 检查当前事务隔离级别(默认Repeatable Read)。可以尝试调整为Read Committed,减少锁冲突: ```sql SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED; ``` 但需注意隔离级别降低可能带来其他问题(如不可重复读)。 ### 预防措施 - **监控与告警**:监控数据库锁等待情况,及时发现并处理。 - **压力测试**:在高并发场景下进行测试,提前发现潜在锁问题。 ### 总结 解决"Lock wait timeout exceeded"的关键在于减少锁的持有时间和冲突。通过优化事务设计、代码逻辑和数据库配置,可以有效避免此问题。如果问题持续出现,建议深入分析具体业务场景和SQL执行计划。 §§相关问题§§ 1. 如何监控MySQL中的锁等待情况? 2. 在Spring中如何正确管理事务以避免死锁? 3. MySQL的事务隔离级别有哪些,分别如何影响并发性能?</think>### MySQL事务回滚异常解决方案(Lock wait timeout exceeded) #### 问题本质分析 该异常表示事务等待锁超时(默认50秒),通常由以下原因导致: 1. **长事务阻塞**:某个事务长时间持有锁未提交(如引用[3]中的跨线程事务场景) 2. **高并发冲突**:多个事务同时竞争同一资源(如引用[2]描述) 3. **未提交事务**:代码逻辑导致事务未及时提交(如循环内开启事务) 4. **死锁循环**:事务间形成资源竞争闭环 #### 解决方案 ##### 1. 紧急处理(临时) ```sql -- 查看阻塞中的事务 SELECT * FROM information_schema.innodb_trx ORDER BY trx_started DESC; -- 终止阻塞进程(替换为实际trx_mysql_thread_id) KILL 123456; ``` ##### 2. 代码优化(根本解决) **事务拆分原则**: ```java // 错误示例(跨线程事务) @Transactional public void methodA() { bService.deleteData(); // 持有锁 new Thread(() -> { cService.updateData(); // 新线程尝试获取锁 → 死锁 }).start(); thread.join(); } // 正确写法(提交事务后再启线程) public void methodA() { transactionTemplate.execute(status -> { bService.deleteData(); return null; // 提交事务 }); new Thread(() -> cService.updateData()).start(); } ``` **关键优化点**: 1. 避免事务中嵌套异步操作 2. 事务内只包含必要数据库操作 3. 使用`@Transactional(timeout=10)`设置事务超时 4. 按固定顺序访问资源(如先A表后B表) ##### 3. 数据库配置调优 ```sql -- 查看当前锁超时设置 SHOW VARIABLES LIKE 'innodb_lock_wait_timeout'; -- 临时调整(重启失效) SET GLOBAL innodb_lock_wait_timeout=120; -- 永久调整(修改my.cnf) [mysqld] innodb_lock_wait_timeout=120 ``` ##### 4. 索引优化 ```sql -- 检查未走索引的SQL(导致全表锁) EXPLAIN SELECT * FROM orders WHERE status='PENDING'; -- 添加缺失索引 CREATE INDEX idx_status ON orders(status); ``` ##### 5. 监控与预防 ```sql -- 实时监控锁等待 SHOW ENGINE INNODB STATUS; ``` #### 最佳实践总结 1. **短事务原则**:单个事务执行时间应<1秒 2. **更新顺序**:所有事务按相同顺序操作资源 3. **索引覆盖**:确保WHERE条件使用索引 4. **重试机制**:捕获异常后自动重试(最多3次) 5. **连接池配置**:控制最大连接数避免资源耗尽 > 注:对于引用[3]中的跨线程事务场景,**必须确保主事务提交后再启动新线程**,否则必然触发锁超时[^3]。
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