Thanks James, It looks like batch acknowledgement was the problem. Once omtimizeAcknowledgeis turned OFF, the consumer memory never grows beyond 1-2 MB which is what were expecting. We did NOT have to tune the prefetch size (which BTW we found out is 32000 by default).
I don't know what is the algorithm used for determining when the grouped messages need to be acknowledged, but if in case you guys are going to revisit it, maybe it should take available heap size into consideration (just a suggestion). Thanks again for your time. karthik -- View this message in context: http://www.nabble.com/4.0-Consumer-OutOfMemoryError-bug--t1707655.html#a4831142 Sent from the ActiveMQ - User forum at Nabble.com.
