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https://issues.apache.org/jira/browse/PHOENIX-3858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16013611#comment-16013611
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James Taylor commented on PHOENIX-3858:
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[~mujtabachohan] can you test with mutable tables for writes to confirm the 2x
cost is due to the lose of this optimization?
> Index maintenance not required for local indexes of table with immutable rows
> -----------------------------------------------------------------------------
>
> Key: PHOENIX-3858
> URL: https://issues.apache.org/jira/browse/PHOENIX-3858
> Project: Phoenix
> Issue Type: Bug
> Reporter: Rajeshbabu Chintaguntla
> Assignee: Rajeshbabu Chintaguntla
> Fix For: 4.11.0
>
>
> While preparing index mutations we are are scanning data region for index
> maintenance which is not required in case of immutable rows. This
> optimisation is very helpful for local indexes which got removed in the
> recent changes.
> FYI [~jamestaylor] [~mujtabachohan] Found this while checking PHOENIX-3853.
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