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https://issues.apache.org/jira/browse/HCATALOG-3?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035628#comment-13035628
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Jakob Homan commented on HCATALOG-3:
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I'm not requesting to drop JMS, just to keep it cleanly integrated so (1) it 
would be easy to test via mocking or such to avoid the activemq inclusion and 
(2) so that later on, we could contribute a patch to make other systems, like 
Kafka, work.  Messaging is general enough that it should be relatively 
straightforward to have a clean interface around it.  Since I don't have a 
patch ready for something like supporting Kafka, I'm certainly not trying to 
block JMS. 

> Send a message on a message bus when events occur in Metastore 
> ---------------------------------------------------------------
>
>                 Key: HCATALOG-3
>                 URL: https://issues.apache.org/jira/browse/HCATALOG-3
>             Project: HCatalog
>          Issue Type: New Feature
>            Reporter: Ashutosh Chauhan
>         Attachments: hcat_3.patch, hcat_3_1.patch, hcat_3_1.patch
>
>
> By implementing a MetaStoreEventListener interface.

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