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