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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8459) make online region snapshotting based on region names instead of region server names
Date Mon, 29 Apr 2013 22:28:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13644971#comment-13644971
] 

Jonathan Hsieh commented on HBASE-8459:
---------------------------------------

yes, i did.  I'll edit the description to reflect that.
                
> make online region snapshotting based on region names instead of region server names
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-8459
>                 URL: https://issues.apache.org/jira/browse/HBASE-8459
>             Project: HBase
>          Issue Type: Bug
>          Components: snapshots
>    Affects Versions: 0.94.6.1, 0.95.0
>            Reporter: Jonathan Hsieh
>
> Currently, online snapshots assign work by region server.  This works when regionseveers
do not fail or moved regions.  In 0.95+, the table locks prevent moves while snapshotting
is in progress but a failed RS during a snapshot may still fail in the verification step.
 This is because the failure would trigger an assignment which may occur after the work for
the regionserver is determined, leaving some regions unsnapshotted, thus leaving it to fail
in the verification step.  
> If we instead assigned snapshotting work by region name, a moved region could be snapshotted
by the newly assigned region.

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