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https://issues.apache.org/jira/browse/QPID-3604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13193256#comment-13193256
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Rajith Attapattu commented on QPID-3604:
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Robbie, I agree with you there.
The sequence should be,
1. Issue message stops and sync, waiting for the broker to confirm. At this
point we can safely assume that the broker will not be sending any more
messages.
2. Drain the dispatch queue
3. Drain the individual consumer queues.
So if I change the order then I agree we don't need the message
MessageDeliveryLock.
Rajith
> If the connection is stopped the client should release all it's messages in
> the prefetch buffer
> -----------------------------------------------------------------------------------------------
>
> Key: QPID-3604
> URL: https://issues.apache.org/jira/browse/QPID-3604
> Project: Qpid
> Issue Type: Bug
> Components: Java Client
> Affects Versions: 0.14
> Reporter: Rajith Attapattu
> Assignee: Rajith Attapattu
> Fix For: 0.15
>
>
> When connection.stop() is called, the JMS client should release all it's
> messages in the prefetch buffer.
> For all we know, the connection may never be started (depending on
> application logic) and those messages will be stuck on the prefetch buffer.
> Releasing it will allow another consumer to get them (in the case of a shared
> queue case).
> Another less severe but nevertheless an undesirable side affect of this is
> the client getting more messages than required by the capacity or prefetch
> arguments. See QPID-3602
> This may not be a big issue if the client is prefetching a few messages, but
> if prefetching something like 5000 messages, this could potentially cause a
> lethal spike in the clients memory usage.
> Even in low capacity/prefetch values, if the messages are large (say in the
> mega byte range) this could potentially put the client under memory pressure.
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