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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8942) Thundering herd of RPCs with large responses leads to OOM
Date Thu, 18 Oct 2012 19:30:03 GMT
Jason Lowe created HADOOP-8942:
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             Summary: Thundering herd of RPCs with large responses leads to OOM
                 Key: HADOOP-8942
                 URL: https://issues.apache.org/jira/browse/HADOOP-8942
             Project: Hadoop Common
          Issue Type: Bug
          Components: ipc
    Affects Versions: 0.23.3
            Reporter: Jason Lowe


When a large number of clients are all making calls with large amounts of response data then
the IPC server can exhaust memory.  See MAPREDUCE-4730 for an example of this.

There does not appear to be any flow control between the server's handler threads and the
responder thread.  If a handler thread cannot write out all of the response data without blocking,
it queues up the remainder for the responder thread and goes back to the next call in the
call queue.  If there are enough clients, this can cause the handler threads to overwhelm
the heap by queueing response data faster than it can be processed.

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