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https://issues.apache.org/jira/browse/PHOENIX-4278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16369014#comment-16369014
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Rajeshbabu Chintaguntla commented on PHOENIX-4278:
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Working on this to port to 5.x.

> Implement pure client side transactional index maintenance
> ----------------------------------------------------------
>
>                 Key: PHOENIX-4278
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4278
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: James Taylor
>            Assignee: Ohad Shacham
>            Priority: Major
>             Fix For: 4.14.0
>
>         Attachments: PHOENIX-4278.4.x-HBase-1.3.v1.patch, 
> PHOENIX-4278_v2.patch
>
>
> The index maintenance for transactions follows the same model as non 
> transactional tables - coprocessor based on data table updates that looks up 
> previous row value to perform maintenance. This is necessary for non 
> transactional tables to ensure the rows are locked so that a consistent view 
> may be obtained. However, for transactional tables, the time stamp oracle 
> ensures uniqueness of time stamps (via transaction IDs) and the filtering 
> handles a scan seeing the "true" last committed value for a row. Thus, 
> there's no hard dependency to perform this on the server side.
> Moving the index maintenance to the client side would prevent any RS->RS RPC 
> calls (which have proved to be troublesome for HBase). It would require 
> returning more data to the client (i.e. the prior row value), but this seems 
> like a reasonable tradeoff.



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