[jira] Resolved: (CAMEL-2047) camel-jms async consumer needs dynamic mechanism to throttle message consumption

["Claus Ibsen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/activemq/browse/CAMEL-2047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Claus Ibsen resolved CAMEL-2047.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 2.1.0
         Assignee: Claus Ibsen

> camel-jms async consumer needs dynamic mechanism to throttle message consumption
> --------------------------------------------------------------------------------
>
>                 Key: CAMEL-2047
>                 URL: https://issues.apache.org/activemq/browse/CAMEL-2047
>             Project: Apache Camel
>          Issue Type: Improvement
>          Components: camel-jms
>    Affects Versions: 2.0.0
>            Reporter: Ron Gavlin
>            Assignee: Claus Ibsen
>             Fix For: 2.1.0
>
>
> camel-jms should provide an async consumer that can throttle consumption of incoming messages. This is necessary in scenarios where a large backlog of messages exists on the input queue. In this case, it is likely that an async consumer will overload camel with message exchanges resulting in problems. A dynamic throttling mechanism on the async camel-jms consumer is required to avoid this problem.
> One possible implementation might be as follows:
> First, add a property "maxPendingAsyncExchanges" on the async camel-jms consumer endpoint. Then add support in the endpoint to track the total number of pending/in-progress exchanges, i.e., the number of exchanges for which no SUCCESS/ERROR acknowledgement has been returned. When this value reaches "maxPendingAsyncExchanges", then the endpoint would stop its Spring JMS DefaultMessageListenerContainer. Once the number of "pending" exchanges drops below a percentage of the "maxPendingAsyncExchanges" threshold, say "reconnectPercentOfMax", the Spring DMLC would be restarted. 
> The CXF implementation of this capability is described in CXF-2002, CXF-2342, and CXF-2391. CXF has properties maxSuspendedContinuations and reconnectPercentOfMax to control the throttling behavior.
> This is the type of dynamic throttling I envisioned in Camel. Thoughts?

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