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https://issues.apache.org/jira/browse/HBASE-19095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16221408#comment-16221408
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Duo Zhang commented on HBASE-19095:
-----------------------------------

Yes. In memory compaction can drop cells so we need to provide CP hooks to 
reset versions and TTL otherwise the example in HBASE-19033 will fail.

> Add CP hooks in RegionObserver for in memory compaction
> -------------------------------------------------------
>
>                 Key: HBASE-19095
>                 URL: https://issues.apache.org/jira/browse/HBASE-19095
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Coprocessors
>            Reporter: Duo Zhang
>             Fix For: 2.0.0-alpha-4
>
>
> This is a hole in our CP hooks.



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