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https://issues.apache.org/jira/browse/HBASE-4811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13666018#comment-13666018
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Lars Hofhansl commented on HBASE-4811:
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HadoopQA does not work against 0.94. Would need a trunk patch for that.
I glanced over the patch and it looks pretty good. Nice test coverage!
This *is* a pretty big change for 0.94. At the same time it would unlock a
bunch of new use cases (I had requests for reverse scan from some of our teams
here).
Do you have this in a production cluster? Can you also make a trunk patch?
(Would need a patch for trunk anyway, and it would also allow us to run
HadoopQA against it).
> 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: HBase-4811-0.94.3modified.txt, HBase-4811-0.94-v2.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.
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