com.mysql.cj.jdbc.exceptions.CommunicationsException：通信链路故障连接重置

Question

遇到问题。日志如下

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet successfully received from the server was 7,202,037 milliseconds ago. The last packet sent successfully to the server was 7,202,037 milliseconds ago.
    at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:953)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeQuery(ClientPreparedStatement.java:1003)
    at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeQuery(ProxyPreparedStatement.java:52)
    at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeQuery(HikariProxyPreparedStatement.java)
    at org.quartz.impl.jdbcjobstore.StdJDBCDelegate.selectSchedulerStateRecords(StdJDBCDelegate.java:2994)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.findFailedInstances(JobStoreSupport.java:3384)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.clusterCheckIn(JobStoreSupport.java:3470)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.doCheckin(JobStoreSupport.java:3330)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$ClusterManager.manage(JobStoreSupport.java:3935)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$ClusterManager.run(JobStoreSupport.java:3972)
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

The last packet successfully received from the server was 7,202,037 milliseconds ago. The last packet sent successfully to the server was 7,202,037 milliseconds ago.
    at sun.reflect.GeneratedConstructorAccessor124.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
    at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)
    at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)
    at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167)
    at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:546)
    at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:710)
    at com.mysql.cj.protocol.a.NativeProtocol.sendCommand(NativeProtocol.java:649)
    at com.mysql.cj.protocol.a.NativeProtocol.sendQueryPacket(NativeProtocol.java:951)
    at com.mysql.cj.NativeSession.execSQL(NativeSession.java:1075)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:930)
    ... 9 common frames omitted
Caused by: java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(SocketInputStream.java:210)
    at java.net.SocketInputStream.read(SocketInputStream.java:141)
    at com.mysql.cj.protocol.ReadAheadInputStream.fill(ReadAheadInputStream.java:107)
    at com.mysql.cj.protocol.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:150)
    at com.mysql.cj.protocol.ReadAheadInputStream.read(ReadAheadInputStream.java:180)
    at java.io.FilterInputStream.read(FilterInputStream.java:133)
    at com.mysql.cj.protocol.FullReadInputStream.readFully(FullReadInputStream.java:64)
    at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:63)
    at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:45)
    at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:52)
    at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:41)
    at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:54)
    at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:44)
    at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:540)

1.我从来没有设置过参数7200秒，最熟悉的参数是linux默认的tcp_keepalive_time(cat /proc/sys/net/ipv4/tcp_keepalive_time) 2.基于错误堆栈Quartz框架调用findFailedInstances方法来检查其他实例是否存活，它不能花费2小时（7200秒）长 3.Mysql wait_timeout设置为8小时，hikari MAX_LIFETIME使用默认参数（1800秒） 4.那些错误是突然出现的，大部分时候应用都是正常的

我的问题是是什么原因导致这个错误，我如何找到真正的原因，或者如何证明这不是我的应用程序问题。我怀疑Proxy sql端已在没有通知的情况下终止连接，但我不熟悉proxy sql无法解决

如有任何建议，我们将不胜感激。

Answer 1

您好，我面临着完全相同的问题，您找到解决方案了吗？