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Posted to common-dev@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2015/03/31 21:33:54 UTC

[jira] [Created] (HADOOP-11780) Prevent IPC reader thread death

Daryn Sharp created HADOOP-11780:
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             Summary: 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
            Priority: Critical


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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