I would suggest you upgrade to 5.3 if possible - it would be the most
straight forward way to resolve this
On 31 Dec 2009, at 09:59, KameshBathina wrote:
Hi,
We are using ActiveMQ 4 as messaging middle ware in our application.
Our
architecture involves many (~20) durable subscribers and single
producer,
all consumers are subscribed to a single topic. The producer sends
keep
alive messages to all consumers periodically.
When one of the consumer goes down, then the pending messages for that
consumer are keep growing and over a time it occupying 20MB (default
broker
memory for AMQ 4) and making broker MemoryPercentageUsed to 100%.
After this
point the producer is blocked in publish() method. Hope that the
default
producer flow control mechanism is triggering and halting the
producer. Even
though other consumers are working fine, due to one down consumer
entire
messaging system is going into hang state. The broker is in this
state till
the DOWN consumer is up and consumed its messages.
I have gone through documentation and user forums and found that
"constantPendingMessageLimitStrategy" and
"constantPendingMessageLimit"
properties can be used to limit the number of pending messages per
consumer.
But these options are not working for durable subscribers.
I tried with timetolive option with messages also, in AMQ 4 this
field is
not working (ie., even after timetolive expired the messages are not
getting
removed from messaging system)
Can any body suggest me how can I avoid this issue with durable
subscribers
and limit the pending messages so that producer will not block and
rest of
the system will work fine.
Thanks and Regards,
Kamesh
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