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https://issues.apache.org/jira/browse/HADOOP-11780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee updated HADOOP-11780:
--------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Fix Version/s: 3.0.0-alpha2
2.8.0
Status: Resolved (was: Patch Available)
Thanks for the review, [~shv]. Committed this to trunk through branch-2.8. The
patch needs a minor tweak for branch-2.7.
> Prevent IPC reader thread death
> -------------------------------
>
> Key: HADOOP-11780
> URL: https://issues.apache.org/jira/browse/HADOOP-11780
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 2.0.0-alpha
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Fix For: 2.8.0, 3.0.0-alpha2
>
> Attachments: HADOOP-11780.patch
>
>
> Reader threads can die to a race condition with the responder thread. If the
> server's ipc handler cannot send a response in one write, it delegates
> sending the rest of the response to the responder thread.
> The race occurs when the responder thread has an exception writing to the
> socket. The responder closes the socket. This wakes up the reader polling
> on the socket. If a {{CancelledKeyException}} is thrown, which is a runtime
> exception, the reader dies. All connections serviced by that reader are now
> in limbo until the client possibly times out. New connections play roulette
> as to whether they are assigned to a defunct reader.
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