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From Will van der Leij <>
Subject Re: Broker not releasing memory
Date Fri, 28 Nov 2008 07:42:16 GMT

We see similar behaviour in a slightly different setup so I'd like to
elaborate a bit in the hope of finding out if this is either intended
behaviour or a memory leak.

Essentially, with a single or multiple producers and a single or multiple
consumers on a single topic:
 - We send messages faster than the consumer can read asynchronously
 - When the send queue is larger than the consumer's prefetch buffer then 
   we correctly see messages filling up the broker memory
(memoryPercentUSage in JMX)
 - Killing the consumer (cleanly through a close or not-cleanly with a
terminate signal) 
   results in the memoryPercentUsage not being released
   - even though there are no more consumers on the Topic
   - this memory is never released until the broker is restarted

I've tried it with persistence on and off, all the retroactive recovery
options on and off, flow control on and off, caching on and off,
asynchronous dispatching on and off, noLocal flag on and off etc.

This is a very typical case of a consumer dying with inflight messages on
the broker. Is the behaviour of the messages not being cleaned up or
recovered intended (i.e. they are there for a reason) or is there soething
wrnog with the setup.

Many thanks
Will van der Leij

Frugia, Kirby A wrote:
> Hi All,
> Sorry I dual-posted in the dev list.  I think I sent to the wrong one...
> We are seeing an issue with our broker not releasing memory on topics.
> Setup:
> * Active MQ 5.1 (out of the box)
> * Persistent messages sent by publishers
> * Non-durable topics
> We were seeing an issue in production with slow consumers causing the
> broker to run out of memory.
> We wrote a test app, which has one publisher and one subscriber to the
> same topic.  The publisher sends messages on this topic frequently.  The
> subscriber, upon receiving a message, goes to sleep for 10 minutes.
> Very quickly, the broker runs out of memory.  When this happens, our
> publishers can no longer send messages; the send is blocked. This is
> expected.  However, if we kill our application (which cleanly disconnects
> from the broker), the broker's memory usage (MemoryPercentUsage) does not
> go back down.  Also, any new apps that startup will have their publishers
> blocked.
> Shouldn't the broker release the memory associated with these messages?
> Thanks,
> Kirby

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