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https://issues.apache.org/jira/browse/FLINK-19264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17197360#comment-17197360
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Zhu Zhu commented on FLINK-19264:
---------------------------------
Thanks for reporting and investigating this issue!
I had wrongly assumed that a {{JobVertexID}} is generated randomly. But it is
not. Instead, it is generated from the hash of StreamNode, which is always the
same in the same topology. That's why in [~aljoscha]'s case {{JobVertexID}}
from different jobs can be the same.
Including the {{JobID}} in {{ExecutionAttemptID}} sounds a valid solution to
me, given that a Flink cluster will not accept a job with duplicated {{JobID}}.
I'm also thinking whether we can further {{JobVertexID}} and
{{IntermediateDataSetID}} to consist of {{JobID}} in the future. In this way,
the composite {{ExecutionAttemptID}} will be naturally unique across jobs.
> Identical jobs cannot be run concurrently
> -----------------------------------------
>
> Key: FLINK-19264
> URL: https://issues.apache.org/jira/browse/FLINK-19264
> Project: Flink
> Issue Type: Bug
> Affects Versions: 1.12.0
> Reporter: Aljoscha Krettek
> Priority: Blocker
>
> While working on FLINK-19123 I noticed that jobs often fail on
> {{MiniCluster}} when multiple jobs are running at the same time.
> I created a reproducer here:
> https://github.com/aljoscha/flink/tree/flink-19123-fix-test-stream-env-alternative.
> You can run {{MiniClusterConcurrencyITCase}} to see the problem in action.
> Sometimes the test will succeed, sometimes it will fail with
> {code}
> java.util.concurrent.ExecutionException:
> org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
> at
> java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
> at
> java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1908)
> at
> org.apache.flink.test.example.MiniClusterConcurrencyITCase.submitConcurrently(MiniClusterConcurrencyITCase.java:60)
> 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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
> at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
> at org.junit.rules.RunRules.evaluate(RunRules.java:20)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
> at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
> at
> com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
> at
> com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
> at
> com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
> at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
> Caused by: org.apache.flink.runtime.client.JobExecutionException: Job
> execution failed.
> at
> org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult(JobResult.java:147)
> at
> org.apache.flink.runtime.minicluster.MiniClusterJobClient.lambda$getJobExecutionResult$2(MiniClusterJobClient.java:107)
> at
> java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:616)
> at
> java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:591)
> at
> java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
> at
> java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1975)
> at
> org.apache.flink.runtime.rpc.akka.AkkaInvocationHandler.lambda$invokeRpc$0(AkkaInvocationHandler.java:229)
> at
> java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:774)
> at
> java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:750)
> at
> java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
> at
> java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1975)
> at
> org.apache.flink.runtime.concurrent.FutureUtils$1.onComplete(FutureUtils.java:926)
> at akka.dispatch.OnComplete.internal(Future.scala:264)
> at akka.dispatch.OnComplete.internal(Future.scala:261)
> at akka.dispatch.japi$CallbackBridge.apply(Future.scala:191)
> at akka.dispatch.japi$CallbackBridge.apply(Future.scala:188)
> at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:36)
> at
> org.apache.flink.runtime.concurrent.Executors$DirectExecutionContext.execute(Executors.java:74)
> at
> scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:44)
> at
> scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:252)
> at akka.pattern.PromiseActorRef.$bang(AskSupport.scala:572)
> at
> akka.pattern.PipeToSupport$PipeableFuture$$anonfun$pipeTo$1.applyOrElse(PipeToSupport.scala:22)
> at
> akka.pattern.PipeToSupport$PipeableFuture$$anonfun$pipeTo$1.applyOrElse(PipeToSupport.scala:21)
> at scala.concurrent.Future$$anonfun$andThen$1.apply(Future.scala:436)
> at scala.concurrent.Future$$anonfun$andThen$1.apply(Future.scala:435)
> at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:36)
> at
> akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
> at
> akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91)
> at
> akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
> at
> akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
> at
> scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
> at
> akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90)
> at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40)
> at
> akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(ForkJoinExecutorConfigurator.scala:44)
> 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.flink.runtime.JobException: Recovery is suppressed by
> NoRestartBackoffTimeStrategy
> at
> org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.handleFailure(ExecutionFailureHandler.java:116)
> at
> org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.getFailureHandlingResult(ExecutionFailureHandler.java:78)
> at
> org.apache.flink.runtime.scheduler.DefaultScheduler.handleTaskFailure(DefaultScheduler.java:215)
> at
> org.apache.flink.runtime.scheduler.DefaultScheduler.maybeHandleTaskFailure(DefaultScheduler.java:208)
> at
> org.apache.flink.runtime.scheduler.DefaultScheduler.updateTaskExecutionStateInternal(DefaultScheduler.java:202)
> at
> org.apache.flink.runtime.scheduler.SchedulerBase.updateTaskExecutionState(SchedulerBase.java:523)
> at
> org.apache.flink.runtime.jobmaster.JobMaster$1.onMissingDeploymentsOf(JobMaster.java:237)
> at
> org.apache.flink.runtime.jobmaster.DefaultExecutionDeploymentReconciler.reconcileExecutionDeployments(DefaultExecutionDeploymentReconciler.java:55)
> at
> org.apache.flink.runtime.jobmaster.JobMaster$TaskManagerHeartbeatListener.reportPayload(JobMaster.java:1229)
> at
> org.apache.flink.runtime.jobmaster.JobMaster$TaskManagerHeartbeatListener.reportPayload(JobMaster.java:1216)
> at
> org.apache.flink.runtime.heartbeat.HeartbeatManagerImpl.receiveHeartbeat(HeartbeatManagerImpl.java:199)
> at
> org.apache.flink.runtime.jobmaster.JobMaster.heartbeatFromTaskManager(JobMaster.java:674)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:279)
> at
> org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:199)
> at
> org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:74)
> at
> org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:152)
> at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26)
> at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21)
> at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:123)
> at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21)
> at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:170)
> at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
> at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
> at akka.actor.Actor$class.aroundReceive(Actor.scala:517)
> 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)
> ... 4 more
> Caused by: org.apache.flink.util.FlinkException: Execution
> cbc357ccb763df2852fee8c4fc7d55f2_0_0 is unexpectedly no longer running on
> task executor 0a6edd8c-b1f4-48da-a228-c395b2aff92d.
> at
> org.apache.flink.runtime.jobmaster.JobMaster$1.onMissingDeploymentsOf(JobMaster.java:241)
> ... 31 more
> {code}
> If you reduce the number of submitted jobs the test will always pass.
> Am important piece of the puzzle seems to be this message that you will also
> find in the log output:
> {code}
> 4594 [mini-cluster-io-thread-25] INFO
> org.apache.flink.runtime.taskexecutor.TaskExecutor [] - JobManager for job
> 580f78b9224c2079ebe0c2f6b08fb4ba with leader id
> b0ca0700de4f8e8a2555bfe7596741ac lost leadership.
> {code}
> It seems that the JobMasters of the concurrent jobs somehow clash with each
> other.
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