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https://issues.apache.org/jira/browse/HADOOP-14912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Lowe updated HADOOP-14912:
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Affects Version/s: 2.9.0
3.0.0-alpha4
Target Version/s: 2.9.0, 2.8.3, 3.0.0 (was: 2.8.3)
Thanks for the report and patch! The unit tests appear to be unrelated.
Nit: The following code is now dead and should be removed:
{code}
// guaranteed to find an element if caller acquired permit.
assert e != null : "consumer didn't acquire semaphore!";
{code}
> 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.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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