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https://issues.apache.org/jira/browse/IGNITE-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16342857#comment-16342857
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Tim Onyschak commented on IGNITE-7090:
--------------------------------------

Forgive me, i'm learning git as i go. A new pull request is above. 

Anyway, take a look at this pull request. I was getting confused when 
GridCacheSemaphoreEx sem = cast(dsMap.get(key), GridCacheSemaphoreEx.class) was 
always returning null and how we would access it. BUt after further debuggin 
was i able to understand what you meant. Let me know what you think. 

 

> 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
>            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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