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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14912) FairCallQueue may defer servicing calls
Date Tue, 10 Oct 2017 20:27:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16199300#comment-16199300
] 

Hudson commented on HADOOP-14912:
---------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13063 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/13063/])
HADOOP-14912. FairCallQueue may defer servicing calls. Contributed by (jlowe: rev 1123f8f0b62292197f5433cd40e66d8620044608)
* (edit) hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/FairCallQueue.java


> 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
>             Fix For: 2.9.0, 2.8.3, 3.0.0
>
>         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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