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https://issues.apache.org/jira/browse/PHOENIX-6671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17509306#comment-17509306
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Lars Hofhansl edited comment on PHOENIX-6671 at 3/19/22, 4:52 PM:
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We need to be careful with this in production environments too. The remote call
will now always tie up an extra handler thread even when the target regions are
local.
On the other hand, the chance for that is p=1/number-of-regionservers, so
unless there are special scenarios where we know the region is local I do not
think there is any risk.
Before we merge, let's see where HBASE-26812 is going.
was (Author: lhofhansl):
We need to be careful with this in production environments too. The remote call
will now always tie up an extra handler thread even when the target regions are
local.
On the other hand, the chance for that is p=1/number-of-regionservers, so
unless there are special scenarios where we know the region is local I do not
think there is any risk.
> 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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