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Posted to common-issues@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2017/09/28 16:24:00 UTC
[jira] [Updated] (HADOOP-14912) FairCallQueue may defer servicing
calls
[ https://issues.apache.org/jira/browse/HADOOP-14912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daryn Sharp updated HADOOP-14912:
---------------------------------
Status: Patch Available (was: Open)
> 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
> 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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