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From "Hariharan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3450) Acknowledging prefetched messages using client acknowledge mode
Date Sun, 14 Aug 2011 07:00:27 GMT
Acknowledging prefetched messages using client acknowledge mode
---------------------------------------------------------------

                 Key: AMQ-3450
                 URL: https://issues.apache.org/jira/browse/AMQ-3450
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
            Reporter: Hariharan


We have a situation in front of us and its explained as below:

1. We have durable subscriber subscribed to a topic. 
2. This durable subscriber is a perl script which is run by a daemon.
3. The perl script uses stomp to connect to the broker.
4. The perl script wakes up every 5 mins, checks for messages in the topic and processes them
in a batch by pre-fetching the messages.
5. The subscriber uses a client acknowledgement and acknowledges only the last message of
the batch.
6. We are using AMQ 5.5 with kahaDB persistence.

Now what we see is,

1. Even though the messages are processed in a batch and the last message is acknowledged
the inflight count does not come down.
2. Enqueue count, Dequeue count and Dispatch count do not match.
3. The journal files are not getting cleaned up.

I do understand that the journal files would be cleaned up once the references to the messages
are lost or removed (i.e. the messages are consumed). But does it have to do anything with
the various count attributes I see on the topic?

Also should I expect the inflight count to come down to 0 if client crashes and then consumes
all messages after come back live?

I also see that dequeue count stays at 0 even when the dispatch count and the inflight counts
change. I believe dequeue count has got a direct relation with messages getting removed from
the topic.

Please let me know if there could be any other reason that could cause the journal files to
stay back.

Thank you
Hari

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