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From mikebroberts <>
Subject Re: Out of memory error with durable subscribers
Date Mon, 01 Oct 2007 17:33:00 GMT

Is there any chance someone from the ActiveMQ team can give some insiders
feedback on the below? Even if it's 'durable subscribers are unstable -
don't use them'?


Mike Roberts (development manager for the team Ahmed is on)

aselshamy wrote:
> Hi
> We have one topic publisher that publish 2M messages with 4 durable
> subscribers.  Things go fine till we reached 1.7M we get the
> outofmemoryerror.
> AMQ is setup to use 5 * 20M log  files, and derbydb jdbc persistence.  It
> starts with -Xmx1024M and <usageManager id="memory-manager" limit="512
> MB"/>
> At the time of the out of memory, one of the log file is gone crazy and
> it's size is 415M, derbydb size is so big as well.
> We are using session client acknowledgment.  and prefetch size of 1 (we
> need to serialize message consumption).
> each message is being acknowledged using javax.jms.Message.acknowledge();
> did not find anything on how to change checkpoint interval for
> persistence.
> Any thoughts on what could be the issue?

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