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https://issues.apache.org/jira/browse/FLINK-5836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15878195#comment-15878195
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ASF GitHub Bot commented on FLINK-5836:
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Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/3371
Btw: The failing travis build is due to exceeding the build time.
> 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
>
> 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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