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https://issues.apache.org/jira/browse/HBASE-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850459#action_12850459
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ryan rawson commented on HBASE-2376:
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This would cause challenges when users set timestamps, also when people use the 
unadorned cell-delete command which does an (internal) timestamp set.  We might 
have to add a new timestamp that would allow us to discern the age of a put 
regardless of the actually 'user visible' timestamp.

> Add special SnapshotScanner which presents view of all data at some time in 
> the past
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-2376
>                 URL: https://issues.apache.org/jira/browse/HBASE-2376
>             Project: Hadoop HBase
>          Issue Type: New Feature
>          Components: client, regionserver
>    Affects Versions: 0.20.3
>            Reporter: Jonathan Gray
>
> In order to support a particular kind of database "snapshot" feature which 
> doesn't require copying data, we came up with the idea for a special 
> SnapshotScanner that would present a view of your data at some point in the 
> past.  The primary use case for this would be to be able to recover 
> particular data/rows (but not all data, like a global rollback) should they 
> have somehow been messed up (application fault, application bug, user error, 
> etc.).

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