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From "Rob Godfrey (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-6621) [Java Broker] Slow performance of Shared Groups message grouping on large queues
Date Mon, 06 Jul 2015 11:07:05 GMT
Rob Godfrey created QPID-6621:

             Summary: [Java Broker] Slow performance of Shared Groups message grouping on
large queues
                 Key: QPID-6621
                 URL: https://issues.apache.org/jira/browse/QPID-6621
             Project: Qpid
          Issue Type: Bug
          Components: Java Broker
    Affects Versions: 0.32, 0.30, 0.28
            Reporter: Rob Godfrey
            Assignee: Rob Godfrey
             Fix For: 6.0 [Java]

In shared group mode, when a consumer gets to the point where it has no more messages from
a group acquired by it, the consumer effectively relinquishes control of the group.  At this
point all messages from the group become available to other consumers... which means that
if they have gone "past" any such messages then then need to be reset.

Currently this is achieved by iterating over the group and finding the next available member
of the group, and then making sure the consumers are set to before that point.

However if the queue is large, and the common case is that there are no members of the group,
then every consumption of a message leads to iterating over the whole queue.

It is preferable to keep a track of which messages consumers may have skipped over, and simply
to reset them to the least of these values.

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