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https://issues.apache.org/jira/browse/FLINK-5464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15821684#comment-15821684
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ASF GitHub Bot commented on FLINK-5464:
---------------------------------------

Github user zentol commented on the issue:

    https://github.com/apache/flink/pull/3103
  
    cc @rmetzger 


> MetricQueryService throws NullPointerException on JobManager
> ------------------------------------------------------------
>
>                 Key: FLINK-5464
>                 URL: https://issues.apache.org/jira/browse/FLINK-5464
>             Project: Flink
>          Issue Type: Bug
>          Components: Webfrontend
>    Affects Versions: 1.2.0
>            Reporter: Robert Metzger
>            Assignee: Chesnay Schepler
>
> I'm using Flink 699f4b0.
> My JobManager log contains many of these log entries:
> {code}
> 2017-01-11 19:42:05,778 WARN  
> org.apache.flink.runtime.webmonitor.metrics.MetricFetcher     - Fetching 
> metrics failed.
> akka.pattern.AskTimeoutException: Ask timed out on 
> [Actor[akka://flink/user/MetricQueryService#-970662317]] after [10000 ms]
>       at 
> akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:334)
>       at akka.actor.Scheduler$$anon$7.run(Scheduler.scala:117)
>       at 
> scala.concurrent.Future$InternalCallbackExecutor$.scala$concurrent$Future$InternalCallbackExecutor$$unbatchedExecute(Future.scala:694)
>       at 
> scala.concurrent.Future$InternalCallbackExecutor$.execute(Future.scala:691)
>       at 
> akka.actor.LightArrayRevolverScheduler$TaskHolder.executeTask(Scheduler.scala:474)
>       at 
> akka.actor.LightArrayRevolverScheduler$$anon$8.executeBucket$1(Scheduler.scala:425)
>       at 
> akka.actor.LightArrayRevolverScheduler$$anon$8.nextTick(Scheduler.scala:429)
>       at 
> akka.actor.LightArrayRevolverScheduler$$anon$8.run(Scheduler.scala:381)
>       at java.lang.Thread.run(Thread.java:745)
> 2017-01-11 19:42:07,765 WARN  
> org.apache.flink.runtime.metrics.dump.MetricQueryService      - An exception 
> occurred while processing a message.
> java.lang.NullPointerException
>       at 
> org.apache.flink.runtime.metrics.dump.MetricDumpSerialization.serializeGauge(MetricDumpSerialization.java:162)
>       at 
> org.apache.flink.runtime.metrics.dump.MetricDumpSerialization.access$300(MetricDumpSerialization.java:47)
>       at 
> org.apache.flink.runtime.metrics.dump.MetricDumpSerialization$MetricDumpSerializer.serialize(MetricDumpSerialization.java:90)
>       at 
> org.apache.flink.runtime.metrics.dump.MetricQueryService.onReceive(MetricQueryService.java:109)
>       at 
> akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:167)
>       at akka.actor.Actor$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}



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