Nico Kruber created FLINK-7734:
----------------------------------

             Summary: test instability in ResourceManagerTest
                 Key: FLINK-7734
                 URL: https://issues.apache.org/jira/browse/FLINK-7734
             Project: Flink
          Issue Type: Bug
          Components: ResourceManager, Tests
    Affects Versions: 1.4.0
            Reporter: Nico Kruber
            Priority: Critical


{code}
Tests run: 8, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 4.033 sec <<< 
FAILURE! - in org.apache.flink.runtime.clusterframework.ResourceManagerTest
testHeartbeatTimeoutWithTaskExecutor(org.apache.flink.runtime.clusterframework.ResourceManagerTest)
  Time elapsed: 0.716 sec  <<< ERROR!
java.util.concurrent.ExecutionException: 
org.apache.flink.runtime.rpc.exceptions.FencingTokenException: Fencing token 
mismatch: Ignoring message LocalFencedMessage(null, 
LocalRpcInvocation(registerTaskExecutor(String, ResourceID, SlotReport, Time))) 
because the fencing token null did not match the expected fencing token 
9320b08d25f4e942b332acbae9464e8b.
        at 
java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
        at 
java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1915)
        at 
org.apache.flink.runtime.clusterframework.ResourceManagerTest.testHeartbeatTimeoutWithTaskExecutor(ResourceManagerTest.java:541)
Caused by: org.apache.flink.runtime.rpc.exceptions.FencingTokenException: 
Fencing token mismatch: Ignoring message LocalFencedMessage(null, 
LocalRpcInvocation(registerTaskExecutor(String, ResourceID, SlotReport, Time))) 
because the fencing token null did not match the expected fencing token 
9320b08d25f4e942b332acbae9464e8b.
        at 
org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleMessage(FencedAkkaRpcActor.java:73)
        at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.lambda$onReceive$0(AkkaRpcActor.java:129)
        at 
akka.actor.ActorCell$$anonfun$become$1.applyOrElse(ActorCell.scala:534)
        at akka.actor.Actor$class.aroundReceive(Actor.scala:467)
        at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:97)
        at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
        at akka.actor.ActorCell.invoke(ActorCell.scala:487)
        at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
        at akka.dispatch.Mailbox.run(Mailbox.scala:220)
        at 
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)
        at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
        at 
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
        at 
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at 
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
{code}

https://travis-ci.org/NicoK/flink/jobs/280858456



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