[jira] [Closed] (FLINK-9324) SingleLogicalSlot returns completed release future before slot is properly returned

["Till Rohrmann (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-9324?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Till Rohrmann closed FLINK-9324.
--------------------------------
    Resolution: Fixed

Fixed via
master: c7eb6acaf95a6656ec6bd0a0b401c1944473e7f2
1.5.0: 7470b96536f8471855a43ce6f1856cec4bb9fbea

> 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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