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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