我遇到了死锁异常，但是当我想从“ SHOW ENGINE INNODB STATUS”中看到一些有关该死锁的信息时，它包含了更长时间之前（在异常发生之前很长时间）的死锁信息，因此它看起来像是“未捕获”通过该命令。
从stacktrace可以看到，我执行的最后一个应用程序代码是$Proxy174.attemptToAcquireJobExecution，它是spring数据接口的实现：
@Transactional(TxType.REQUIRES_NEW)
@Modifying
@Query("UPDATE Job SET last_run = NOW(),
last_run_by=:runner
WHERE name = :name
AND (last_run + :interval ) < NOW()")
int attemptToAcquireJobExecution(
@Param("name") String var1,
@Param("interval") int var2,
@Param("runner") String var3);
它在这样一个简单的表上运行：
CREATE TABLE `jobs` (
`name` varchar(50) COLLATE utf8mb4_unicode_ci NOT NULL,
`last_run_by` varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`last_run` datetime(3) DEFAULT NULL,
`context_data` varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
PRIMARY KEY (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
执行该命令的计划任务每几分钟运行一次（在3个应用程序实例上），因此发生冲突的风险确实很小，但是死锁却经常发生...在该操作之前的任何地方都没有@Transactional，因此应该真的没有挂起的交易。无论如何，对这些命令执行ping操作会产生空结果：
SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCKS ;
SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCK_WAITS;
原始堆栈跟踪，我的类在底部标记为“ xxx”：
com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(NativeConstructorAccessorImpl.java)
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:3973)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2497)
at com.mysql.jdbc.ConnectionImpl.commit(ConnectionImpl.java:1566)
... 2 frames excluded
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126)
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108)
at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:81)
at com.sun.proxy.$Proxy121.commit(Unknown Source)
at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.commit(AbstractLogicalConnectionImplementor.java:80)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:232)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:65)
at org.hibernate.jpa.internal.TransactionImpl.commit(TransactionImpl.java:61)
... 49 common frames omitted
Wrapped by: javax.persistence.PersistenceException: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1692)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1602)
at org.hibernate.jpa.internal.TransactionImpl.commit(TransactionImpl.java:75)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:517)
... 48 common frames omitted
Wrapped by: org.springframework.orm.jpa.JpaSystemException: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction; nested exception is javax.persistence.PersistenceException: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:418)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:246)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:521)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:761)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:730)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:504)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:292)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:57)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy174.attemptToAcquireJobExecution(Unknown Source)
at xxx.lib.scheduler.JobsService.checkIfJobShouldBeExecuted(JobsService.java:32)
at xxx.lib.scheduler.StandardBatchStarter.startScheduled(StandardBatchStarter.java:38)
at xxx.scheduled.ImportProductDescriptionJob.startScheduled(ImportProductDescriptionJob.java:46)
at xxx.scheduled.ImportProductDescriptionJob$$FastClassBySpringCGLIB$$494978af.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:85)
at org.springframework.cloud.sleuth.instrument.scheduling.TraceSchedulingAspect.traceBackgroundThread(TraceSchedulingAspect.java:72)
... 2 frames excluded
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:629)
... 21 frames truncated
最佳答案
AND (last_run + :interval ) < NOW()
可能导致语法错误-或数据错误。
请提供生成的SQL。我怀疑它正在产生
AND (last_run + 2) < NOW()
但这必须像
AND (last_run + INTERVAL 2 DAY) < NOW()
另外，请提供
SHOW CREATE Job。关于mysql - Innodb死锁，在ENGINE INNODB STATUS中未提及，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/43496186/