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https://issues.apache.org/jira/browse/FLINK-8505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16338001#comment-16338001
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Till Rohrmann commented on FLINK-8505:
--------------------------------------

Another instance: https://travis-ci.org/apache/flink/jobs/332770324

> SlotManager can reach inconsistent state
> ----------------------------------------
>
>                 Key: FLINK-8505
>                 URL: https://issues.apache.org/jira/browse/FLINK-8505
>             Project: Flink
>          Issue Type: Bug
>          Components: Distributed Coordination
>    Affects Versions: 1.5.0
>            Reporter: Till Rohrmann
>            Assignee: Till Rohrmann
>            Priority: Major
>              Labels: flip-6
>             Fix For: 1.5.0
>
>
> The {{SlotManager}} can reach an inconsistent state when a formerly free task 
> slot is reported as allocated by an incoming {{SlotReport}}. The problem is 
> that the slot won't be removed from the set of free slots and, thus, will be 
> considered for future slot requests.
> The solution is to remove the slot from the set of free slots once it is 
> reported allocated.
>  
> https://travis-ci.org/tillrohrmann/flink/jobs/332871241



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