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https://issues.apache.org/jira/browse/HBASE-4811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13155692#comment-13155692
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John Carrino commented on HBASE-4811:
-------------------------------------
So looking at the region splitting code it looks like any scans that
are open on ranges that are split get a special exception type and
then just open a new scanner. So we don't have to worry about reverse
iteration any more than forward with respect to splitting.
I think this might boil down to writing a reverse iterator
(HFileScanner) for HFile.
-jc
On Tue, Nov 22, 2011 at 3:48 PM, stack (Commented) (JIRA)
> 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
>
> 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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