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From "Sergey Beryozkin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CXF-2002) Server async jms transport needs dynamic mechanism to throttle message consumption
Date Thu, 16 Apr 2009 11:05:14 GMT

    [ https://issues.apache.org/jira/browse/CXF-2002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12699637#action_12699637
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Sergey Beryozkin commented on CXF-2002:
---------------------------------------

Hi Ron

> What would you think about setting a bogus selector on the DefaultMessageListenerContainer
to suspend message consumption?  That appears to be the technique used to implement JMS-based
throttling in the new SMX4 Cluster Endpoint

Sounds like a neat idea. Suppose we just set some bogus selector like "org.apache.cxf.jms.continuations.too-many"
so it will keep the incoming messages in the queue till the original selector is restored.


I was also thinking about simply blocking the request threads for the time specified in suspend()
- it would keep the JMS thread blocked and thus all the existing JMS request threads will
eventually be locked till a number of continuations decreases - but I'm not 100% sure it would
actually prevent the JMS runtime from creating new JMS threads which would continue pump new
messages into the memory.

What do you think about this second idea ?
cheers, Sergey

> Server async jms transport needs dynamic mechanism to throttle message consumption
> ----------------------------------------------------------------------------------
>
>                 Key: CXF-2002
>                 URL: https://issues.apache.org/jira/browse/CXF-2002
>             Project: CXF
>          Issue Type: Improvement
>          Components: Transports
>    Affects Versions: 2.0.9, 2.1.3, 2.0.10
>            Reporter: Ron Gavlin
>            Assignee: Sergey Beryozkin
>             Fix For: 2.2.1
>
>
> Currently, the server-side async jms transport has no mechanism to throttle consumption
of incoming messages. This becomes problematic in scenarios where a large backlog of messages
exists on the input queue. In this case, it is likely that the cxf server will overload its
internal work item queues resulting in problems. A dynamic throttling mechanism on the async
jms server is required to avoid this problem.

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