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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-14912) FairCallQueue may defer servicing calls
Date Wed, 27 Sep 2017 21:03:00 GMT
Daryn Sharp created HADOOP-14912:
------------------------------------

             Summary: 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: 2.8.2
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp


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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