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https://issues.apache.org/jira/browse/HBASE-11653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14083241#comment-14083241
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Gary Helmling commented on HBASE-11653:
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This is only present in 0.94, since 0.96+ have refactored the put() path to go
through doBatchMutate().
> RegionObserver coprocessor cannot override KeyValue values in prePut()
> ----------------------------------------------------------------------
>
> Key: HBASE-11653
> URL: https://issues.apache.org/jira/browse/HBASE-11653
> Project: HBase
> Issue Type: Bug
> Components: Coprocessors
> Affects Versions: 0.94.21
> Reporter: Gary Helmling
> Assignee: Gary Helmling
> Priority: Critical
>
> Due to a bug in {{HRegion.internalPut()}}, any modifications that a
> {{RegionObserver}} makes to a Put's family map in the {{prePut()}} hook are
> lost.
> This prevents coprocessors from modifying the values written by a {{Put}}.
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