Slow consumers can cause issues for a JMS provider. There's some
background here:
http://docs.codehaus.org/display/ACTIVEMQ/Slow+Consumers
For non-durable topics sometimes you don't want slow consumers
slowing down your producer; you want to keep publishing at a high a
rate as possible for the fast consumers and discard old messages for
the slow consumers who can't keep up.
I've recently committed a patch that allows you to configure a
maximum pending message limit such that slow consumers, when they
fall too far behind, will start having their old messages discarded.
Its described in gory detail here...
http://docs.codehaus.org/display/ACTIVEMQ/Slow+Consumer+Handling
Anyone who's sending around messages on non-durable topics and is
prepared to discard messages for slow consumers (e.g. for sending
around stock prices in finance) should give this feature a try.
James
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