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https://issues.apache.org/jira/browse/QPID-4286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Dillaman updated QPID-4286:
---------------------------------
Attachment: qpid-4286.patch
Quick patch against 0.18 branch to utilize a unique lock for v1 QMF events
instead of the standard 'userLock' and to enqueue v2 QMF commands for async
processing to prevent blocking all available worker threads.
> 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
> Attachments: qpid-4286.patch
>
>
> 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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