[jira] [Commented] (ARTEMIS-853) Support for exclusive consumers

["Gary Tully (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARTEMIS-853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16311473#comment-16311473 ] 

Gary Tully commented on ARTEMIS-853:
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if MaxConsumes=1 did not error with an exception and retained the consumer as pending it would be like the exclusive consumer.
With the exclusive consumer feature, the second or low priority consumer is valid, just not getting any messages. Only when the first consumer goes away does dispatch fallback to the second consumer.
MaxConsumes=1 could work but the client will then have to deal with retrys and timeout and error logs filling up etc.

The original (way back) 5.x use case came from having a HA cluster of active ejb servers with mdbs pointing to the broker, only one should get messages.



> Support for exclusive consumers
> -------------------------------
>
>                 Key: ARTEMIS-853
>                 URL: https://issues.apache.org/jira/browse/ARTEMIS-853
>             Project: ActiveMQ Artemis
>          Issue Type: New Feature
>          Components: Broker
>            Reporter: Matt Pavlovich
>
> Artemis should support a consumer feature where a single consumer receives all messages, even when multiple consumers are present. This capability maintains message ordering while allowing a HA consumer.
> ActiveMQ 5.x supports this, as does IBM MQ, Tibco EMS, etc.



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