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Date: Wed, 21 Nov 2012 03:16:59 +0000 (UTC)
From: "Lars Hofhansl (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <2022553551.10524.1353467819177.JavaMail.jiratomcat@arcas>
Subject: [jira] [Commented] (HBASE-2376) Add special SnapshotScanner which
 presents view of all data at some time in the past
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    [ https://issues.apache.org/jira/browse/HBASE-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13501681#comment-13501681 ] 

Lars Hofhansl commented on HBASE-2376:
--------------------------------------

HBASE-4071 is a bit misnamed. It introduces MIN_VERSIONS. So setting TTL and MIN_VERSIONS does give you exactly what you describe above (I think).

                
> 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: HBase
>          Issue Type: New Feature
>          Components: Client, regionserver
>    Affects Versions: 0.20.3
>            Reporter: Jonathan Gray
>            Assignee: Pritam Damania
>
> 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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