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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14912) FairCallQueue may defer servicing calls
Date Tue, 10 Oct 2017 19:47:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16199256#comment-16199256

Jason Lowe commented on HADOOP-14912:

Thanks for updating the patch!  The unit test failure is unrelated and tracked by HADOOP-14030.

+1 lgtm.  Committing this.

> FairCallQueue may defer servicing calls
> ---------------------------------------
>                 Key: HADOOP-14912
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14912
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 2.9.0, 3.0.0-alpha4, 2.8.2
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HADOOP-14912.1.patch, HADOOP-14912.patch
> HADOOP-14033 switched a lock to a semaphore to allow concurrency for producers &
consumers to the underlying queues.  A race condition was created that may cause a consumer
to acquire a permit but not extract an element, leaving the semaphore with fewer permits than
queued elements.  This causes a minimum number of calls to always be present in the call queue.

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