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Implementation error: Unhandled exception - "Implementation error: Unhandled exception."


Hello,

We have a flink job / cluster running in kubernetes. Flink 1.6.2 (but the same happens in 1.6.0 and 1.6.1) To upgrade our job we use the REST API.

Every so often the jobmanager seems to be stuck in a crashing state and the logs show me this stack trace:

2018-11-07 18:43:05,815 [flink-scheduler-1] ERROR org.apache.flink.runtime.rest.handler.cluster.ClusterOverviewHandler - Implementation error: Unhandled exception.
akka.pattern.AskTimeoutException: Ask timed out on [Actor[akka://flink/user/dispatcher#1016927511]] after [10000 ms]. Sender[null] sent message of type "org.apache.flink.runtime.rpc.messages.Implementation error: Unhandled exception.".
at akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:604)
at akka.actor.Scheduler$$anon$4.run(Scheduler.scala:126)
at scala.concurrent.Future$InternalCallbackExecutor$.unbatchedExecute(Future.scala:601)
at scala.concurrent.BatchingExecutor$class.execute(BatchingExecutor.scala:109)
at scala.concurrent.Future$InternalCallbackExecutor$.execute(Future.scala:599)
at akka.actor.LightArrayRevolverScheduler$TaskHolder.executeTask(LightArrayRevolverScheduler.scala:329)
at akka.actor.LightArrayRevolverScheduler$$anon$4.executeBucket$1(LightArrayRevolverScheduler.scala:280)
at akka.actor.LightArrayRevolverScheduler$$anon$4.nextTick(LightArrayRevolverScheduler.scala:284)
at akka.actor.LightArrayRevolverScheduler$$anon$4.run(LightArrayRevolverScheduler.scala:236)
at java.lang.Thread.run(Thread.java:748)

If I restart the jobmanager everything is fine afterwards, but the jobmanager will not restart by itself.

What might've caused this and is this something we can prevent?

Richard