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

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

Till Rohrmann created FLINK-5836:
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             Summary: 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


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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