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https://issues.apache.org/jira/browse/FLINK-7231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16098091#comment-16098091
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ASF GitHub Bot commented on FLINK-7231:
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Github user StephanEwen closed the pull request at:
https://github.com/apache/flink/pull/4370
> SlotSharingGroups are not always released in time for new restarts
> ------------------------------------------------------------------
>
> Key: FLINK-7231
> URL: https://issues.apache.org/jira/browse/FLINK-7231
> Project: Flink
> Issue Type: Bug
> Components: Distributed Coordination
> Affects Versions: 1.3.1
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Priority: Blocker
> Fix For: 1.4.0, 1.3.2
>
>
> In the case where there are not enough resources to schedule the streaming
> program, a race condition can lead to a sequence of the following errors:
> {code}
> java.lang.IllegalStateException: SlotSharingGroup cannot clear task
> assignment, group still has allocated resources.
> {code}
> This eventually recovers, but may involve many fast restart attempts before
> doing so.
> The root cause is that slots are not cleared before the next restart attempt.
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