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https://issues.apache.org/jira/browse/PHOENIX-2771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15398383#comment-15398383
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Sergey Soldatov commented on PHOENIX-2771:
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[~jamestaylor] nope. That was not integrated yet. And definitely it requires 
some review after all the latest changes related to indexes. So 4.9 looks good 
atm. I will try to do that once I have a free slot. 

> Improve the performance of IndexTool by building the index mutations at 
> reducer side
> ------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-2771
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-2771
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: Rajeshbabu Chintaguntla
>            Assignee: Sergey Soldatov
>             Fix For: 4.9.0
>
>         Attachments: PHOENIX-2771-1.patch, PHOENIX-2771-2.patch
>
>
> Instead of writing the full index mutations to map output at mapper we can 
> just write combined value of indexed column values and prepare proper key 
> values at reducer same as PHOENIX-1973.
> [~sergey.soldatov] can you take up this?



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