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https://issues.apache.org/jira/browse/HIVE-12856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15153471#comment-15153471
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Gunther Hagleitner commented on HIVE-12856:
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If you want to validate that HS2/metastore allows it, use signature?
> LLAP: update (add/remove) the UDFs available in LLAP when they are changed
> (refresh periodically)
> -------------------------------------------------------------------------------------------------
>
> Key: HIVE-12856
> URL: https://issues.apache.org/jira/browse/HIVE-12856
> Project: Hive
> Issue Type: Sub-task
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-12856.01.nogen.patch, HIVE-12856.01.patch,
> HIVE-12856.02.nogen.patch, HIVE-12856.02.patch, HIVE-12856.nogen.patch,
> HIVE-12856.patch
>
>
> I don't think re-querying the functions is going to scale, and the sessions
> obviously cannot notify all LLAP clusters of every change. We should add
> global versioning to metastore functions to track changes, and then possibly
> add a notification mechanism, potentially thru ZK to avoid overloading the
> metastore itself.
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