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From "TH L. (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-2716) ActiveMQConnection leaks memory by caching ActiveMQTempQueue objects
Date Thu, 29 Apr 2010 14:49:33 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-2716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=59166#action_59166
] 

TH L. commented on AMQ-2716:
----------------------------

Or, the temp queue, created by a session, should be closed when the session is closed.

ActiveMQSession can hold the reference on temp queue, when ActiveMQSession.createTemporaryQueue()
is called.

As ActiveMQConnection.close() is called (and its referencing sessions are going to be disposed),
the referenced ActiveMQSession can delete the temp queue created in the session.



> ActiveMQConnection leaks memory by caching ActiveMQTempQueue objects
> --------------------------------------------------------------------
>
>                 Key: AMQ-2716
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2716
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Broker, Geronimo Integration, JMS client, Transport
>    Affects Versions: 5.3.0
>         Environment: 64bit, SuSE 11, Sun Java 1.6.0_17, Geronimo 2.2, embedded AMQ 5.3,
TCP Tranport
>            Reporter: TH L.
>            Priority: Minor
>
> After running messaging several hours with more than 2,000,000 asynchronous send and
more than1,000,000 synchronous send/reply (with temp Queue), I found about 1.5G ActiveMQConnection
objects in my whole 2G memory heap (inspected with jmap and Eclipse Memory Analyzer).
> The 1.5G ActiveMQConnection objects and their referencing objects stay in heap old generation
and cannot be cleaned by GC.
> By looking into those ActiveMQConnections, I found there are a huge amount of HashMaps
holding temp Queue information (e.g. ActiveMQTempQueue with different sequenceId, physicalName,
etc.)
> Since the ActiveMQConnections are pooled, however, why those ActiveMQTempQueues are always
kept in ActiveMQConnections?
> is that a bug? or did I do something wrong (wrong setup, wrong client code)?
> My client code
> {{{
>         QueueConnection connection = null;
>         QueueSession session = null;
>         Queue requestQueue = null;
>         Queue replyQueue = null;
>         QueueReceiver receiver = null;
>         QueueSender sender = null;
>         try {
>             connection = aConnFactory.createQueueConnection();
>             connection.start();
>             session = connection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
>             requestQueue = getDestinationQueue();
>             sender = session.createSender(requestQueue);
>             replyQueue = session.createTemporaryQueue(); // using temp queue
>             aRequestMessage.setJMSReplyTo(replyQueue);
>             sender.send(aRequestMessage, DeliveryMode.NON_PERSISTENT, Message.DEFAULT_PRIORITY,
timeToLive);
>             receiver = session.createReceiver(replyQueue);
>             receiver.receive();
>         } catch (Exception e) {
>               ...
>         } finally {
>             try { receiver.close(); } catch (Exception ignored) {}
>             try { sender.close(); } catch (Exception ignored) {}
>             try { session.close(); } catch (Exception ignored) {}
>             try { connection.close(); } catch (Exception ignored) {}            
>         }
> }}}

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