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https://issues.apache.org/jira/browse/FLINK-9324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16470447#comment-16470447
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ASF GitHub Bot commented on FLINK-9324:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/5980
> SingleLogicalSlot returns completed release future before slot is properly
> returned
> -----------------------------------------------------------------------------------
>
> Key: FLINK-9324
> URL: https://issues.apache.org/jira/browse/FLINK-9324
> Project: Flink
> Issue Type: Bug
> Components: Distributed Coordination
> Affects Versions: 1.5.0, 1.6.0
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Priority: Blocker
> Labels: flip-6
> Fix For: 1.5.0
>
>
> The {{SingleLogicalSlot#releaseSlot}} method returns a future which is
> completed once the slot has been returned to the {{SlotOwner}}.
> Unfortunately, we don't wait for the {{SlotOwner's}} response to complete the
> future but complete it directly after the call has been made. This causes
> that the {{ExecutionGraph}} can get restarted in case of a recovery before
> all of its slots have been returned to the {{SlotPool}}. As a consequence,
> the allocation of the new tasks might require more than the max parallelism
> because of collisions with old tasks (in case of slot sharing).
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