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https://issues.apache.org/jira/browse/HBASE-15585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15222557#comment-15222557
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Andrew Purtell commented on HBASE-15585:
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Coprocessors aren't meant as a means to run arbitrary unvetted user code
[~davelatham] and never have been. They are exactly meant to extend HBase in
the same JVM for maximum performance and flexibility - for the HBase
developers. As you say something external would be appropriate for hosting
random user code you want to run server side.
> RegionServer coprocessors are not flexible enough
> -------------------------------------------------
>
> Key: HBASE-15585
> URL: https://issues.apache.org/jira/browse/HBASE-15585
> Project: HBase
> Issue Type: Bug
> Components: Coprocessors, regionserver
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HBASE-15585.01.patch, HBASE-15585.patch
>
>
> While you can do all kinds of things with coprocessors, like arbitrarily
> discard memstore data or replace files randomly during compaction, I believe
> the ultimate power and flexibility is not there. The patch aims to address
> this shortcoming.
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