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From "Vladisav Jelisavcic (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-7090) Semaphore Stuck when no acquirers to assign permit
Date Thu, 25 Jan 2018 16:50:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16339491#comment-16339491

Vladisav Jelisavcic commented on IGNITE-7090:

[~Timay] but if semaphore already exists than it will do the recovery itself, no need to check
state? If I understand correctly, this bug only happens when there are no acquirers to handle
the node failure (or am I missing something)?

> 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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