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From "Jason Dillaman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-4286) QMF queries for HA replication take too long to process
Date Wed, 05 Sep 2012 20:27:08 GMT
Jason Dillaman created QPID-4286:
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             Summary: QMF queries for HA replication take too long to process
                 Key: QPID-4286
                 URL: https://issues.apache.org/jira/browse/QPID-4286
             Project: Qpid
          Issue Type: Bug
          Components: C++ Broker
    Affects Versions: 0.18
            Reporter: Jason Dillaman


In an HA broker with approximately 12,000 queues, it takes roughly 10-14 seconds for the the
first QMF response fragment to arrive.  While the QMF management agent is collecting the response,
all other QMF-related functionality is blocked  -- which will block any thread that raises
a QMF event.  

Not only will this result in clients getting disconnected from the broker due to worker threads
being blocked by QMF (either due to missed heartbeats in an extreme case or from the 2 second
handshake timeout), this also results in the HA backup's federated link getting disconnected
due to missed heartbeats when the link heartbeat interval is set to a low value.  

If the HA backup loses its connection, it only exacerbates the issue since it will reconnect
and re-query the QMF data that made it lose its connection in the first place.  

Recommend that QMF events not be blocked by a global management agent lock and also recommend
that potentially long-running QMF queries be separated from the worker thread that initiated
them to prevent a heartbeat timeout.


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