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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10162) Add RegionObserver lifecycle hook to be called when region is available
Date Sat, 14 Dec 2013 02:55:08 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13848174#comment-13848174
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Anoop Sam John commented on HBASE-10162:
----------------------------------------

Agree with you Gary..  Being a CP writer, this is my concern too.. Knowing that much internal!!

Yes what ever you mentioned is the best way (as of now) I can also think about.. Any other
suggestions are most welcome.

> Add RegionObserver lifecycle hook to be called when region is available
> -----------------------------------------------------------------------
>
>                 Key: HBASE-10162
>                 URL: https://issues.apache.org/jira/browse/HBASE-10162
>             Project: HBase
>          Issue Type: Improvement
>          Components: Coprocessors
>            Reporter: Gary Helmling
>
> Over in HBASE-10161 and HBASE-10148, there is discussion of the need to modify existing
coprocessors, which previously performed initialization only in postOpen(), in order to account
for the new log replay mechanism happening post open.
> This points out that we have a hole in coprocessor lifecycle management which caused
the use of region lifecycle hooks (postOpen()) in the first place.
> Instead of requiring coprocessor authors to hook into region lifecycle methods for initialization,
we should provide an explicit lifecycle hook for coprocessor authors to use when region open,
log replay, and any future requirements are complete, say initializeWhenAvailable() (open
to better names).



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