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- 【TiDB 版本】：3.0.3
- 【问题描述】：间隔一段时间(大约5分钟)访问tidb时就会抛以下错误
Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 948,688 milliseconds ago. The last packet sent successfully to the server was 948,688 milliseconds ago.
; SQL []; Communications link failure
The last packet successfully received from the server was 948,688 milliseconds ago. The last packet sent successfully to the server was 948,688 milliseconds ago.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 948,688 milliseconds ago. The last packet sent successfully to the server was 948,688 milliseconds ago.
at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:98)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:74)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:421)
at com.sun.proxy.$Proxy17.selectOne(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166)
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:63)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:43)
at com.sun.proxy.$Proxy18.selectSegmentRange(Unknown Source)
at com.taimeitetch.flinketl.service.base.impl.CommonServiceImpl.findSegmentRange(CommonServiceImpl.java:122)
at com.taimeitetch.flinketl.facade.engines.process.impl.OfflineJobProcessImpl.process(OfflineJobProcessImpl.java:95)
at com.taimeitetch.flinketl.facade.engines.impl.FlinkEngineImpl.executeEngin(FlinkEngineImpl.java:37)
at com.taimeitetch.flinketl.facade.impl.ExecuteEngineFacadeImpl.process(ExecuteEngineFacadeImpl.java:83)
at com.taimeitetch.flinketl.process.FlinkETLProcess.main(FlinkETLProcess.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:529)
at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:421)
at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:423)
at org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:813)
at org.apache.flink.client.cli.CliFrontend.runProgram(CliFrontend.java:287)
at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:213)
at org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:1050)
at org.apache.flink.client.cli.CliFrontend.lambda$main$11(CliFrontend.java:1126)
at org.apache.flink.runtime.security.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:30)
at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1126)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 948,688 milliseconds ago. The last packet sent successfully to the server was 948,688 milliseconds ago.
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:404)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:981)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3652)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2460)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2551)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
以下是我连接池参数：
jdbc.maxConnectionsPerPartition=4
jdbc.minConnectionsPerPartition=3
jdbc.partitionCount=3
jdbc.acquireIncrement=5
jdbc.poolAvailabilityThreshold=20
jdbc.idleMaxAgeInMinutes=600
jdbc.connectionTimeoutInMs=600000
jdbc.idleConnectionTestPeriodInMinutes=100
jdbc.maxConnectionAgeInSeconds=36000
但我觉得应该跟这个关系不大，因为在用jdbc连接tidb时也会报同样的问题，该怎么解决？
另外，我在实时任务(时间间隔很小)中，也会出现这个问题
是一个参数吗？