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https://issues.apache.org/jira/browse/PHOENIX-1457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14215016#comment-14215016
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Jesse Yates commented on PHOENIX-1457:
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Seems very feasible. The only thing I would worry about is that HBase uses the
PayloadCarryingRpcController the same way as everything else, so it can be used
to get the RPC priority. Then you would just need to create the logic to handle
those requests in a separate queue, just like with the index updates.
> Use high priority queue for metadata endpoint calls
> ---------------------------------------------------
>
> Key: PHOENIX-1457
> URL: https://issues.apache.org/jira/browse/PHOENIX-1457
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
>
> If the RS hosting the system table gets swamped, then we'd be bottlenecked
> waiting for the response back before running a query when we check if the
> metadata is in sync. We should run endpoint coprocessor calls for
> MetaDataService at a high priority to avoid that.
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