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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-10162) Add RegionObserver lifecycle hook to be called when region is available
Date Fri, 13 Dec 2013 19:27:07 GMT

     [ https://issues.apache.org/jira/browse/HBASE-10162?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Helmling updated HBASE-10162:
----------------------------------

    Description: 
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).

  was:
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 implicit lifecycle hook for coprocessor authors to use when
region open, log replay (and any future requirements) are complete, say initializeWhenAvailable()
(open to better names).


> 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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