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https://issues.apache.org/jira/browse/PHOENIX-6671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17509610#comment-17509610
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Lars Hofhansl commented on PHOENIX-6671:
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Cool. Thanks for checking! I'd vote to get it in then. We can always revert to
the old behavior if/when this is fixed in HBase (and we dropped support for or
discourage any version of HBase that has this bug.)
> Avoid ShortCirtuation Coprocessor Connection with HBase 2.x
> -----------------------------------------------------------
>
> Key: PHOENIX-6671
> URL: https://issues.apache.org/jira/browse/PHOENIX-6671
> Project: Phoenix
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Major
> Fix For: 5.2.0, 5.1.3
>
> Attachments: 6671-5.1.txt
>
>
> See PHOENIX-6501, PHOENIX-6458, and HBASE-26812.
> HBase's ShortCircuit Connection are fundamentally broken in HBase 2. We might
> be able to fix it there, but with all the work the RPC handlers perform now
> (closing scanning, resolving current user, etc), I doubt we'll get that 100%
> right. HBase 3 has removed this functionality.
> Even with HBase 2, which does not have the async protobuf code, I could
> hardly see any performance improvement from circumventing the RPC stack in
> case the target of a Get or Scan is local. Even in the most ideal conditions
> where everything is local, there was improvement outside of noise.
> I suggest we do not use ShortCircuited Connections in Phoenix 5+.
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