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https://issues.apache.org/jira/browse/PHOENIX-4004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16096894#comment-16096894
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Josh Elser commented on PHOENIX-4004:
-------------------------------------
Thanks, Andrew!
Pushing this one before I forget about it again.
> Assorted improvements to reduce garbage in mutable index codepath
> -----------------------------------------------------------------
>
> Key: PHOENIX-4004
> URL: https://issues.apache.org/jira/browse/PHOENIX-4004
> Project: Phoenix
> Issue Type: Improvement
> Reporter: Josh Elser
> Assignee: Josh Elser
> Priority: Minor
> Fix For: 4.12.0
>
> Attachments: PHOENIX-4004.001.patch, PHOENIX-4004.002.patch
>
>
> During some $dayjob testing, I found a couple of places where we were
> unnecessarily creating garbage in the RS. When "forward-porting" this change,
> most of the areas were already cleaned up but there are a few that still
> apply.
> * ArrayList initial sizing
> * Avoid indirection of the (single-threaded) ExecutorService in
> IndexBuildManager (just pure overhead)
> * Some unnecessary KeyValue copies and an array copy (an avoidance of
> deprecated HBase API)
> * Avoid extra {{System.arraycopy}} calls in CoveredColumnIndexCodec via the
> {{ArrayUtils.addAll}} call
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