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From "Fintan Bolton (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2711) conduitSubscriptions flag on networkConnector element should only affect queues, not topics
Date Fri, 23 Apr 2010 14:07:23 GMT
conduitSubscriptions flag on networkConnector element should only affect queues, not topics
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                 Key: AMQ-2711
                 URL: https://issues.apache.org/activemq/browse/AMQ-2711
             Project: ActiveMQ
          Issue Type: Improvement
          Components: Connector
    Affects Versions: 5.3.1
            Reporter: Fintan Bolton
             Fix For: 5.4.0


In the doc for 'Networks of Brokers', http://activemq.apache.org/networks-of-brokers.html,
it says that it is sometimes useful to disable {{conduitSubscriptions}} for queues, because
this gives you a better load balancing effect when consumers are attached to various points
in the broker network. The only trouble is, currently it does not seem practical to disable
{{conduitSubscriptions}}, because this almost inevitably causes trouble with topics. That
is, it can easily happen that topic messages are duplicated, if {{conduitSubscriptions}} is
set to {{false}}.

It seems like it would be better if topic subscriptions where *always* treated as conduits
and the {{conduitSubscriptions}} attribute only affected queue subscriptions. That way, you
could happily disable conduits for queues while leaving it enabled for topics.

A bit of investigation is probably needed, however, to make sure that there aren't any edge
cases where you might actually want to disable conduit subscriptions for topics.

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