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https://issues.apache.org/jira/browse/HBASE-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851278#action_12851278
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ryan rawson commented on HBASE-2376:
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dhruba: but if a user does a delete (cell) then the system will pick the
timestamp of the cell to apply it to and enter it in thusly. so you would
never have a point in time where that cell was not deleted. there would be 2
keyvalues, one put ts=X and the other delete ts=X, even if the delete was
executed at X+L where L might be days, years, centuries (hey with longs it
would allow it).
> 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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