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From "Matthew Roy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-1255) Advisory queues don't disappear for TEMPORARY queues/topics
Date Sun, 02 Mar 2008 01:24:17 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-1255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=41481#action_41481
] 

Matthew Roy commented on AMQ-1255:
----------------------------------

I am having similar problems with Advisory queues not disappearing after a topic is destroyed,
and have found one code path that leaks advisory topics in my application.  If I create a
topic, add a consumer for said topic, send some messages, remove the consumer, and explicitly
destroy the topic, there are times that advisory topics for the topic are left behind.  The
path that lead to this situation in my app was in AdvisoryBroker.addConsumer.  When I create
the topic in the client, no addDestination occurs on the server, but when I add the consumer,
the addConsumer occurs.  The AdvisoryBroker's addConsumer method does:
ActiveMQTopic topic = AdvisorySupport.getConsumerAdvisoryTopic(info.getDestination());
consumers.put(info.getConsumerId(), info);
fireConsumerAdvisory(context, topic, info);

Which in turn causes an addDestination to occur within the RegionBroker when the advisory
event is sent to the ConsumerAdvisoryTopic created above.  What seems to be missing is when
the removeDestination  method occurs, it looks within the AdvisoryBroker's destinations map
for an entry for the destination getting closed, but in my situation there is no entry for
my topic since addDestination never occured within the AdvisoryBroker.  This leaves behind
the ConsumerAdvisoryTopic for my topic within the RegionBroker.

I'm not at all familiar with the inner workings of the Advisory system, but for my system
I was able to greatly reduce the leaks by changing the addConsumer to look like this:

ActiveMQTopic topic = AdvisorySupport.getConsumerAdvisoryTopic(info.getDestination());
consumers.put(info.getConsumerId(), info);
if(!destinations.containsKey(info.getDestination())) {
  DestinationInfo destInfo = new DestinationInfo(context.getConnectionId(), DestinationInfo.ADD_OPERATION_TYPE,
topic);
  fireAdvisory(context, topic, destInfo);
  destinations.put(info.getDestination(), destInfo);
}
 fireConsumerAdvisory(context, topic, info);

By doing this, when a destination is destroyed, the AdvisoryBroker has an entry in the map
for the destination, so is able to remove the advisory topics from the RegionBroker.  I also
did something similar in the addProducer.

As I said, this was simply a blind attempt to solve the leak within my application without
any knowledge of the Advisory system, so I have no idea if this will cause side effects or
unwanted behavior, but it might point someone with more understanding to the source of the
problem.


> Advisory queues don't disappear for TEMPORARY queues/topics
> -----------------------------------------------------------
>
>                 Key: AMQ-1255
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1255
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 4.1.0
>            Reporter: Denis Abramov
>            Assignee: Rob Davies
>             Fix For: 5.2.0
>
>
> My ActiveMQ clients create TEMPORARY queues and I have been looking through the active
queues recently and I noticed a number of advisory queues are sticking around (mostly ones
that have ActiveMQ.Advisory.Producer.*) that refer to the temporary queues that I created.
It seems that even though the temporary queues are gone the advisory topics are still there.
Over time this looks like it degrades the performance of ActiveMQ.

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