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From "Jean-Daniel Cryans (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5190) Limit the IPC queue size based on calls' payload size
Date Fri, 13 Jan 2012 02:03:39 GMT
Limit the IPC queue size based on calls' payload size

                 Key: HBASE-5190
                 URL: https://issues.apache.org/jira/browse/HBASE-5190
             Project: HBase
          Issue Type: Improvement
    Affects Versions: 0.90.5
            Reporter: Jean-Daniel Cryans
             Fix For: 0.94.0

Currently we limit the number of calls in the IPC queue only on their count. It used to be
really high and was dropped down recently to num_handlers * 10 (so 100 by default) because
it was easy to OOME yourself when huge calls were being queued. It's still possible to hit
this problem if you use really big values and/or a lot of handlers, so the idea is that we
should take into account the payload size. I can see 3 solutions:

 - Do the accounting outside of the queue itself for all calls coming in and out and when
a call doesn't fit, throw a retryable exception.
 - Same accounting but instead block the call when it comes in until space is made available.
 - Add a new parameter for the maximum size (in bytes) of a Call and then set the size the
IPC queue (in terms of the number of items) so that it could only contain as many items as
some predefined maximum size (in bytes) for the whole queue.

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