Rob Godfrey created QPID-6621:
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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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