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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7291) Simple Log Roll Snapshot
Date Thu, 06 Dec 2012 08:40:59 GMT
Jonathan Hsieh created HBASE-7291:

             Summary: Simple Log Roll Snapshot
                 Key: HBASE-7291
                 URL: https://issues.apache.org/jira/browse/HBASE-7291
             Project: HBase
          Issue Type: Sub-task
            Reporter: Jonathan Hsieh

This snapshot will likely be the cheapest snapshot taking method -- it rolls or drops a marker
in the hlog when a snapshot request is made.  This approach can be seen as an improvement
upon copytable/export with similar consistency guarantees.  Specifically, there will be "ragged
edges", and happens-before relation on clients may not be consistent from a client's point
of view but it will be useable for many backup for disaster recovery use cases.

For example: 

If client 1 writes row a to region A and then row b to region B, a client happens-before enforcing
snapshot would only be allowed to have neither a nor b, only a, or both a and b.  Having only
b should not be possible.  This outcome would be possible with the log-roll snapshot.

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