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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8459) make online region snapshotting based on region names instead of region server names
Date Mon, 29 Apr 2013 22:14:15 GMT
Jonathan Hsieh created HBASE-8459:
-------------------------------------

             Summary: 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: 0.95.0, 0.94.6.1
            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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