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From sburczymucha <sburczymuchate...@gmail.com>
Subject Prefetch, message consumer async listener and message grouping, transactions & clustering - how does it work?
Date Fri, 18 Sep 2015 22:51:33 GMT
Hello,

I would like to know if I understand how messages are processed in following
configuration. Supposed I have a connection with message prefetch = 5, and
folowing messages in queue:

ID = 1, JMSXGroupID = 1
ID = 2, JMSXGroupID = 1
ID = 3, JMSXGroupID = 2
ID = 4, JMSXGroupID = 1
ID = 5, JMSXGroupID = 2
ID = 6, JMSXGroupID = 1
ID = 7, JMSXGroupID = 2
ID = 8, JMSXGroupID = 1

Client waits for messages with JMSXGroupID = 1. Now, because message
prefetch = 5, all messages with JMSXGroupID = 1 are prefetched to client.
After that, async listener is called with message ID 1, 2, 4, 6, 8 one by
one, am I right? What happens now, when message ID = 4 is NACKed? Does
listener receives message ID 4 again (until it is sent to DLQ queue) or it
receives message Id = 6 because it is already prefetched?

In other words, does listener behaves the same way with message prefetch = 5
and message prefetch = 1?

In this configuaration (prefetch = 5, JMSXGroupID set) does prefetch has any
impact on broker clustering?

Thank you, best regards,



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