Tim Onyschak commented on IGNITE-7090:

[~vladisav] code has been updated, sorry for so many iteration. Let me know if 
i finally have it right. 


> Semaphore Stuck when no acquirers to assign permit
> --------------------------------------------------
>                 Key: IGNITE-7090
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7090
>             Project: Ignite
>          Issue Type: Bug
>          Components: cache, data structures
>    Affects Versions: 2.1, 2.4
>            Reporter: Tim Onyschak
>            Assignee: Tim Onyschak
>            Priority: Major
>             Fix For: 2.5
>         Attachments: SemaphoreFailoverNoWaitingAcquirerTest.java
> If no acquirers are available to take permit of semaphore, the permit never 
> gets release and any further acquirerers will wait forever. 
> On node shut down DataStructuresProcessor.dsMap gets cleared out prior to 
> event listener being able to execute onNodeRemoved, hence owner is never 
> cleared out if it was unable to pass to a different acquirer. 

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