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https://issues.apache.org/jira/browse/HADOOP-11780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15530127#comment-15530127
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Kihwal Lee commented on HADOOP-11780:
-------------------------------------
The 2.7 commit has been done. The only change is using type {{Call}} instead of
{{RpcCall}} in one line. The multiple call type support is missing in 2.7.
Everything else is identical except the type change.
> 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: 2.7.4, 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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