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https://issues.apache.org/jira/browse/HBASE-18793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162703#comment-16162703
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Anoop Sam John commented on HBASE-18793:
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bq.are marked as deprecated for 5 years but they still alive in our code 
base... So I think we just remove the deprecated annotation and keep them there?
Which jira did this deprecation? Ya I think it make sense what u said.  We do 
call this hook also now. I too feel there can be a region level hook before 
flush.   If u see AccessController, we use this hook for the ACL check.. So we 
need this hook I believe.

> Remove deprecated methods in RegionObserver
> -------------------------------------------
>
>                 Key: HBASE-18793
>                 URL: https://issues.apache.org/jira/browse/HBASE-18793
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Coprocessors
>    Affects Versions: 3.0.0, 2.0.0-alpha-3
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>             Fix For: 3.0.0, 2.0.0-alpha-4
>
>         Attachments: HBASE-18793.patch
>
>
> As we have already done lots of incomplete changes on CP APIs and it is 
> allowed to do breaking changes on major release.
> Let's make the API clean.



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