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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2376) Add special SnapshotScanner which presents view of all data at some time in the past
Date Sat, 27 Mar 2010 02:18:27 GMT

    [ 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:
------------------------------------

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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