[jira] [Closed] (FLINK-7216) ExecutionGraph can perform concurrent global restarts to scheduling

["Stephan Ewen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-7216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephan Ewen closed FLINK-7216.
-------------------------------

> ExecutionGraph can perform concurrent global restarts to scheduling
> -------------------------------------------------------------------
>
>                 Key: FLINK-7216
>                 URL: https://issues.apache.org/jira/browse/FLINK-7216
>             Project: Flink
>          Issue Type: Bug
>          Components: Distributed Coordination
>    Affects Versions: 1.2.1, 1.3.1
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>            Priority: Blocker
>             Fix For: 1.4.0, 1.3.2
>
>
> Because ExecutionGraph restarts happen asynchronously and possibly delayed, it can happen in rare corner cases that two restarts are attempted concurrently, in which case some structures on the Execution Graph undergo a concurrent access:
> Sample stack trace:
> {code}
> WARN  org.apache.flink.runtime.executiongraph.ExecutionGraph        - Failed to restart the job.
> java.lang.IllegalStateException: SlotSharingGroup cannot clear task assignment, group still has allocated resources.
>     at org.apache.flink.runtime.jobmanager.scheduler.SlotSharingGroup.clearTaskAssignment(SlotSharingGroup.java:78)
>     at org.apache.flink.runtime.executiongraph.ExecutionJobVertex.resetForNewExecution(ExecutionJobVertex.java:535)
>     at org.apache.flink.runtime.executiongraph.ExecutionGraph.restart(ExecutionGraph.java:1151)
>     at org.apache.flink.runtime.executiongraph.restart.ExecutionGraphRestarter$1.call(ExecutionGraphRestarter.java:40)
>     at akka.dispatch.Futures$$anonfun$future$1.apply(Future.scala:95)
>     at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
>     at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
>     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>     at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>     at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
>     at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
>     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>     at java.lang.Thread.run(Thread.java:748)
> {code}
> The solution is to strictly guard against "subsumed" restarts via the {{globalModVersion}} in a similar way as we fence local restarts against global restarts.



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