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From "dhruba borthakur (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 23:39:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850609#action_12850609
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dhruba borthakur commented on HBASE-2376:
-----------------------------------------

@andrew: Yes, the TTAK should default to 0.

@ryan: If we explain that when a user set timestamps, then the TTKAV will apply to it. If
the user dos not set timestamps, then the system will assign a timestamp to every record and
will use it to not delete records within the TTKAV. do you see any confusion here?

> 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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