flinkCDC报错：but this is no longer available on the server

Posted 2022-04-16 打不死的小强哥哥

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最近自己做了一个从香港和大陆不同的从库，通过binlog同步几十张表到一个自己的库中的事情。

用到的技术就是：Maxwell+kafka+flink，但是在这个过程中遇到一个错误一直无法很好的解决，就是flink的job工作一段时间后，就曝出了如下错误：

Caused by: org.apache.kafka.connect.errors.ConnectException: The connector is trying to read binlog starting at GTIDs afc2c4d5-7061-11ec-a4a5-00163e35e020:1-1717327 and binlog file 'mysql-bin.000443', pos=6207230, skipping 0 events plus 0 rows, but this is no longer available on the server. Reconfigure the connector to use a snapshot when needed.
        at io.debezium.connector.mysql.MySqlConnectorTask.start(MySqlConnectorTask.java:133)
        at io.debezium.connector.common.BaseSourceTask.start(BaseSourceTask.java:106)
        at io.debezium.embedded.EmbeddedEngine.run(EmbeddedEngine.java:758)
        at io.debezium.embedded.ConvertingEngineBuilder$2.run(ConvertingEngineBuilder.java:171)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

The program finished with the following exception:

org.apache.flink.client.program.ProgramInvocationException: The main method caused an error: org.apache.flink.client.program.ProgramInvocationException: Job failed (JobID: 7fc06fafeb5bd823b1f58c70651f6c40)
        at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:372)
        at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:222)
        at org.apache.flink.client.ClientUtils.executeProgram(ClientUtils.java:114)
        at org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:812)
        at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:246)
        at org.apache.flink.client.cli.CliFrontend.parseAndRun(CliFrontend.java:1054)
        at org.apache.flink.client.cli.CliFrontend.lambda$main$10(CliFrontend.java:1132)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1729)
        at org.apache.flink.runtime.security.contexts.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41)
        at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1132)
Caused by: java.util.concurrent.ExecutionException: org.apache.flink.client.program.ProgramInvocationException: Job failed (JobID: 7fc06fafeb5bd823b1f58c70651f6c40)
        at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
        at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895)
        at org.apache.flink.client.program.StreamContextEnvironment.getJobExecutionResult(StreamContextEnvironment.java:123)
        at org.apache.flink.client.program.StreamContextEnvironment.execute(StreamContextEnvironment.java:80)
        at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1834)
        at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1817)
        at com.sonkwo.dw.realtime.app.dwd.BaseDB_CNApp.main(BaseDB_CNApp.java:122)
        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:355)
        ... 11 more
Caused by: org.apache.flink.client.program.ProgramInvocationException: Job failed (JobID: 7fc06fafeb5bd823b1f58c70651f6c40)
        at org.apache.flink.client.deployment.ClusterClientJobClientAdapter.lambda$null$6(ClusterClientJobClientAdapter.java:125)
        at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602)
        at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
        at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
        at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962)
        at org.apache.flink.runtime.concurrent.FutureUtils.lambda$retryOperationWithDelay$9(FutureUtils.java:394)
        at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
        at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
        at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
        at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962)
        at org.apache.flink.client.program.rest.RestClusterClient.lambda$pollResourceAsync$24(RestClusterClient.java:670)
        at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
        at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
        at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
        at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962)
        at org.apache.flink.runtime.concurrent.FutureUtils.lambda$retryOperationWithDelay$9(FutureUtils.java:394)
        at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
        at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
        at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
        at java.util.concurrent.CompletableFuture.postFire(CompletableFuture.java:561)
        at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:929)
        at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
        at org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult(JobResult.java:144)
        at org.apache.flink.client.deployment.ClusterClientJobClientAdapter.lambda$null$6(ClusterClientJobClientAdapter.java:123)
        ... 24 more
Caused by: org.apache.flink.runtime.JobException: Recovery is suppressed by FixedDelayRestartBackoffTimeStrategy(maxNumberRestartAttempts=3, backoffTimeMS=30000)
        at org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.handleFailure(ExecutionFailureHandler.java:138)
        at org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.getFailureHandlingResult(ExecutionFailureHandler.java:82)
        at org.apache.flink.runtime.scheduler.DefaultScheduler.handleTaskFailure(DefaultScheduler.java:207)
        at org.apache.flink.runtime.scheduler.DefaultScheduler.maybeHandleTaskFailure(DefaultScheduler.java:197)
        at org.apache.flink.runtime.scheduler.DefaultScheduler.updateTaskExecutionStateInternal(DefaultScheduler.java:188)
        at org.apache.flink.runtime.scheduler.SchedulerBase.updateTaskExecutionState(SchedulerBase.java:677)
        at org.apache.flink.runtime.scheduler.SchedulerNG.updateTaskExecutionState(SchedulerNG.java:79)
        at org.apache.flink.runtime.jobmaster.JobMaster.updateTaskExecutionState(JobMaster.java:435)
        at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:305)
        at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:212)
        at org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:77)
        at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:158)
        at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26)
        at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21)
        at scala.PartialFunction.applyOrElse(PartialFunction.scala:123)
        at scala.PartialFunction.applyOrElse$(PartialFunction.scala:122)
        at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21)
        at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
        at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172)
        at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172)
        at akka.actor.Actor.aroundReceive(Actor.scala:517)
        at akka.actor.Actor.aroundReceive$(Actor.scala:515)
        at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:225)
        at akka.actor.ActorCell.receiveMessage(ActorCell.scala:592)
        at akka.actor.ActorCell.invoke(ActorCell.scala:561)
        at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258)
        at akka.dispatch.Mailbox.run(Mailbox.scala:225)
        at akka.dispatch.Mailbox.exec(Mailbox.scala:235)
        at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
        at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
        at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: org.apache.kafka.connect.errors.ConnectException: The connector is trying to read binlog starting at GTIDs afc2c4d5-7061-11ec-a4a5-00163e35e020:1-1717327 and binlog file 'mysql-bin.000443', pos=6207230, skipping 0 events plus 0 rows, but this is no longer available on the server. Reconfigure the connector to use a snapshot when needed.
        at io.debezium.connector.mysql.MySqlConnectorTask.start(MySqlConnectorTask.java:133)
        at io.debezium.connector.common.BaseSourceTask.start(BaseSourceTask.java:106)
        at io.debezium.embedded.EmbeddedEngine.run(EmbeddedEngine.java:758)
        at io.debezium.embedded.ConvertingEngineBuilder$2.run(ConvertingEngineBuilder.java:171)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

从错误上来看，是因为flink程序报错后需要进行检查点恢复，但是无法找到对应的检查点文件信息。

因为同步香港站和大陆站，是两个类似的flink job，我当时就让两个job指向了同一个hadoop的checkpoint目录，这样就导致某个job在恢复的时候就找不到对应的checkpoint文件了。

所以，最终的解决方法就是：修改flink的程序让每一个job的检查点目录设置成不一样的目录，即可解决此问题。

同步香港站的状态后端设置：


env.setStateBackend(new FsStateBackend(SonkwoConfig.HADOOP_HDFS_URL+"/flink/stateBackend/hk"));

同步大陆站的状态后端设置：

env.setStateBackend(new FsStateBackend(SonkwoConfig.HADOOP_HDFS_URL+"/flink/stateBackend/cn"));

作为程序员，还是细心决定一切啊，若你不细心，程序会给你较真的！！！

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