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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4811) Support reverse Scan
Date Sun, 09 Jun 2013 03:56:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678933#comment-13678933
] 

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

The idea is great, I love that feature. It was long deemed impossible to do this at all.
But the patch can be improved. Can we at least get rid of the class casts?

-0 from me for the current form. (I'm not going to block it)

Maybe somebody else should have a look too ([~saint.ack@gmail.com], [~sershe], [~ramkrishna.s.vasudevan@gmail.com],
[~tedyu@apache.org])?

I will have some time after HBaseCon, so I can have a try at improving the patch (and as I
said the general architecture is sound).
                
> 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, 0.94.7
>            Reporter: John Carrino
>            Assignee: Liang Xie
>         Attachments: 4811-trunk-v5.patch, HBase-4811-0.94.3modified.txt, HBase-4811-0.94-v2.txt,
hbase-4811-trunkv1.patch, hbase-4811-trunkv4.patch, hbase-4811-trunkv6.patch, hbase-4811-trunkv7.patch
>
>
> 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.

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