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https://issues.apache.org/jira/browse/PHOENIX-4344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16665693#comment-16665693
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Lars Hofhansl commented on PHOENIX-4344:
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An interesting observation is of course that if there a global _immutable_ 
index the delete *has* to happen from the client, and for globalĀ _mutable_ 
index the delete will incur a server-server roundtrip. So this really only 
works well with local indexes.

> MapReduce Delete Support
> ------------------------
>
>                 Key: PHOENIX-4344
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4344
>             Project: Phoenix
>          Issue Type: New Feature
>    Affects Versions: 4.12.0
>            Reporter: Geoffrey Jacoby
>            Assignee: Geoffrey Jacoby
>            Priority: Major
>
> Phoenix already has the ability to use MapReduce for asynchronous handling of 
> long-running SELECTs. It would be really useful to have this capability for 
> long-running DELETEs, particularly of tables with indexes where using HBase's 
> own MapReduce integration would be prohibitively complicated. 



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