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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7291) Simple Log Roll Snapshot
Date Sat, 08 Dec 2012 05:31:21 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Hsieh updated HBASE-7291:
----------------------------------

    Attachment: snapshot-online-test-demo.jruby

Attached testing script.  Requires HBASE-7306 to run properly.
                
> 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
>            Assignee: Jonathan Hsieh
>         Attachments: hbase-7291.v1.patch, pre-hbase-7291.v1.patch, snapshot-online-test-demo.jruby
>
>
> 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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