You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2013/05/01 07:38:16 UTC

[jira] [Commented] (HBASE-4811) Support reverse Scan

    [ https://issues.apache.org/jira/browse/HBASE-4811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13646393#comment-13646393 ] 

Lars Hofhansl commented on HBASE-4811:
--------------------------------------

If we wanted to have this backward compatible in 0.94 we would need to encode the reversed bit in the Scan's attributes... Or use a new scan version only reversed is true (so that an old regionserver would fail the scan request).

                
> Support reverse Scan
> --------------------
>
>                 Key: HBASE-4811
>                 URL: https://issues.apache.org/jira/browse/HBASE-4811
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client
>    Affects Versions: 0.20.6
>            Reporter: John Carrino
>         Attachments: HBase-4811-0.94.3modified.txt
>
>
> All the documentation I find about HBase says that if you want forward and reverse scans you should just build 2 tables and one be ascending and one descending.  Is there a fundamental reason that HBase only supports forward Scan?  It seems like a lot of extra space overhead and coding overhead (to keep them in sync) to support 2 tables.  
> I am assuming this has been discussed before, but I can't find the discussions anywhere about it or why it would be infeasible.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira