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From "Tim Onyschak (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-7090) Semaphore Stuck when no acquirers to assign permit
Date Mon, 29 Jan 2018 03:46:00 GMT

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

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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