[jira] [Created] (FLINK-7231) SlotSharingGroups are not always released in time for new restarts

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-7231:
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             Summary: 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
             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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