[jira] [Closed] (FLINK-5836) Race condition between slot offering and task deployment

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

     [ https://issues.apache.org/jira/browse/FLINK-5836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Till Rohrmann closed FLINK-5836.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 1.3.0

Fixed via d6aed38b3a15946d383d762030b5f5c1418388de

> Race condition between slot offering and task deployment
> --------------------------------------------------------
>
>                 Key: FLINK-5836
>                 URL: https://issues.apache.org/jira/browse/FLINK-5836
>             Project: Flink
>          Issue Type: Bug
>          Components: Distributed Coordination
>    Affects Versions: 1.3.0
>            Reporter: Till Rohrmann
>            Assignee: Wenlong Lyu
>              Labels: flip-6
>             Fix For: 1.3.0
>
>
> The Flip-6 code has a race condition when offering slots to a {{JobManager}} which directly deploys tasks to the offered slots. In such a situation it is possible that the deploy call overtakes the acknowledge message for the slot offering. As a result, the slots are not marked yet as active and the deployment will fail.
> I propose to fix this problem by first activating all offered slots before sending the slot offer message to the {{JobManager}}. Consequently, we'll deactivate and free slots which haven't been accepted by the {{JobManager}} once we've received the offering acknowledge message.



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