Communications link failure

异常信息： 

org.springframework.orm.jpa.JpaSystemException: Unable to commit against JDBC Connection; nested exception is org.hibernate.TransactionException: Unable to commit against JDBC Connection
	at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:351) ~[spring-orm-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:253) ~[spring-orm-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:536) ~[spring-orm-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:746) ~[spring-tx-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:714) ~[spring-tx-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:534) ~[spring-tx-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:305) ~[spring-tx-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) ~[spring-tx-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) ~[spring-tx-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:138) ~[spring-data-jpa-2.1.9.RELEASE.jar!/:2.1.9.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93) ~[spring-aop-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61) ~[spring-data-commons-2.1.9.RELEASE.jar!/:2.1.9.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	at com.sun.proxy.$Proxy216.deleteAllInBatch(Unknown Source) ~[?:?]
	.............
	at com.dangdang.ddframe.job.executor.type.SimpleJobExecutor.process(SimpleJobExecutor.java:41) [elastic-job-common-core-2.1.5.jar!/:?]
	at com.dangdang.ddframe.job.executor.AbstractElasticJobExecutor.process(AbstractElasticJobExecutor.java:206) [elastic-job-common-core-2.1.5.jar!/:?]
	at com.dangdang.ddframe.job.executor.AbstractElasticJobExecutor.process(AbstractElasticJobExecutor.java:171) [elastic-job-common-core-2.1.5.jar!/:?]
	at com.dangdang.ddframe.job.executor.AbstractElasticJobExecutor.execute(AbstractElasticJobExecutor.java:150) [elastic-job-common-core-2.1.5.jar!/:?]
	at com.dangdang.ddframe.job.executor.AbstractElasticJobExecutor.execute(AbstractElasticJobExecutor.java:122) [elastic-job-common-core-2.1.5.jar!/:?]
	at com.dangdang.ddframe.job.lite.internal.schedule.LiteJob.execute(LiteJob.java:26) [elastic-job-lite-core-2.1.5.jar!/:?]
	at org.quartz.core.JobRunShell.run(JobRunShell.java:202) [quartz-2.3.1.jar!/:?]
	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) [quartz-2.3.1.jar!/:?]
Caused by: org.hibernate.TransactionException: Unable to commit against JDBC Connection
	at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.commit(AbstractLogicalConnectionImplementor.java:87) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:272) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:532) ~[spring-orm-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	... 36 more
Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet successfully received from the server was 24,202 milliseconds ago.  The last packet sent successfully to the server was 24,202 milliseconds ago.
	at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.jdbc.ConnectionImpl.commit(ConnectionImpl.java:813) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.jdbc.ha.MultiHostMySQLConnection.commit(MultiHostMySQLConnection.java:164) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at sun.reflect.GeneratedMethodAccessor209.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_111]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_111]
	at com.mysql.cj.jdbc.ha.LoadBalancedConnectionProxy.invokeMore(LoadBalancedConnectionProxy.java:565) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.jdbc.ha.MultiHostConnectionProxy.invoke(MultiHostConnectionProxy.java:479) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.sun.proxy.$Proxy177.commit(Unknown Source) ~[?:?]
	at com.alibaba.druid.pool.DruidPooledConnection.commit(DruidPooledConnection.java:749) ~[druid-1.1.16.jar!/:1.1.16]
	at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.commit(AbstractLogicalConnectionImplementor.java:81) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:272) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:532) ~[spring-orm-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	... 36 more
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

The last packet successfully received from the server was 24,202 milliseconds ago.  The last packet sent successfully to the server was 24,202 milliseconds ago.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_111]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_111]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_111]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_111]
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:562) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:732) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.NativeProtocol.sendCommand(NativeProtocol.java:671) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.NativeProtocol.sendQueryPacket(NativeProtocol.java:986) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.NativeProtocol.sendQueryString(NativeProtocol.java:921) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.NativeSession.execSQL(NativeSession.java:1165) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.jdbc.ConnectionImpl.commit(ConnectionImpl.java:801) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.jdbc.ha.MultiHostMySQLConnection.commit(MultiHostMySQLConnection.java:164) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at sun.reflect.GeneratedMethodAccessor209.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_111]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_111]
	at com.mysql.cj.jdbc.ha.LoadBalancedConnectionProxy.invokeMore(LoadBalancedConnectionProxy.java:565) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.jdbc.ha.MultiHostConnectionProxy.invoke(MultiHostConnectionProxy.java:479) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.sun.proxy.$Proxy177.commit(Unknown Source) ~[?:?]
	at com.alibaba.druid.pool.DruidPooledConnection.commit(DruidPooledConnection.java:749) ~[druid-1.1.16.jar!/:1.1.16]
	at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.commit(AbstractLogicalConnectionImplementor.java:81) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:272) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:532) ~[spring-orm-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
	... 36 more
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
	at com.mysql.cj.protocol.FullReadInputStream.readFully(FullReadInputStream.java:67) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:63) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:45) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:52) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:41) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:54) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:44) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:556) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:732) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.NativeProtocol.sendCommand(NativeProtocol.java:671) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.NativeProtocol.sendQueryPacket(NativeProtocol.java:986) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.protocol.a.NativeProtocol.sendQueryString(NativeProtocol.java:921) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.NativeSession.execSQL(NativeSession.java:1165) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.jdbc.ConnectionImpl.commit(ConnectionImpl.java:801) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.jdbc.ha.MultiHostMySQLConnection.commit(MultiHostMySQLConnection.java:164) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at sun.reflect.GeneratedMethodAccessor209.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_111]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_111]
	at com.mysql.cj.jdbc.ha.LoadBalancedConnectionProxy.invokeMore(LoadBalancedConnectionProxy.java:565) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.mysql.cj.jdbc.ha.MultiHostConnectionProxy.invoke(MultiHostConnectionProxy.java:479) ~[mysql-connector-java-8.0.16.jar!/:8.0.16]
	at com.sun.proxy.$Proxy177.commit(Unknown Source) ~[?:?]
	at com.alibaba.druid.pool.DruidPooledConnection.commit(DruidPooledConnection.java:749) ~[druid-1.1.16.jar!/:1.1.16]
	at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.commit(AbstractLogicalConnectionImplementor.java:81) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:272) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104) ~[hibernate-core-5.3.10.Final.jar!/:5.3.10.Final]
	at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:532) ~[spring-orm-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]

重点：

1、Caused by: org.hibernate.TransactionException: Unable to commit against JDBC Connection

2、Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

3、Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.

经过排查发现，其他业务表都能正常执行sql，但是定时任务有一张数据表数据达到100w+，需要执行清除数据sql 语句执行时间过长，导致连接池断开连接

修改前清空表数据 采用的是jpa 的deleteAllInBatch方法：

qpCustomerInterfaceRepository.deleteAllInBatch();

修改后采用截断表的方式：

    @Query(value = "truncate table 表名 ", nativeQuery = true)
    @Modifying
    @Transactional
	void truncateAllInBatch();

解决方法：

优化sql 语句， 或者延长连接超时时间