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https://issues.apache.org/jira/browse/HBASE-10114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13844952#comment-13844952
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chunhui shen commented on HBASE-10114:
--------------------------------------
Committed to trunk and 0.98.
Thanks Ted.
> _scan_internal() in table.rb should accept argument that specifies reverse
> scan
> -------------------------------------------------------------------------------
>
> Key: HBASE-10114
> URL: https://issues.apache.org/jira/browse/HBASE-10114
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Fix For: 0.98.0, 0.99.0
>
> Attachments: hbase-10114-trunk.patch
>
>
> Reversed Scan usage on Shell:
> hbase> scan 't1', {REVERSED => true}
> Other parameter could also be added with 'REVERSED', like LIMIT,COLUMNS.
> Examples:
> hbase(main):019:0* scan 't1'
> ROW COLUMN+CELL
>
>
> 001 column=f1:q1,
> timestamp=1386644670350, value=v1
>
> 002 column=f1:q2,
> timestamp=1386644675585, value=v1
>
> 003 column=f1:q1,
> timestamp=1386644680090, value=v1
>
> 003 column=f1:q2,
> timestamp=1386644682749, value=v1
>
> 004 column=f1:q1,
> timestamp=1386644692589, value=v1
>
> 4 row(s) in 0.0130 seconds
> hbase(main):022:0> scan 't1',{REVERSED => true}
> ROW COLUMN+CELL
>
>
> 004 column=f1:q1,
> timestamp=1386644692589, value=v1
>
> 003 column=f1:q1,
> timestamp=1386644680090, value=v1
>
> 003 column=f1:q2,
> timestamp=1386644682749, value=v1
>
> 002 column=f1:q2,
> timestamp=1386644675585, value=v1
>
> 001 column=f1:q1,
> timestamp=1386644670350, value=v1
> hbase(main):023:0> scan 't1',{REVERSED => true,COLUMNS=>'f1:q2'}
> ROW COLUMN+CELL
>
>
> 003 column=f1:q2,
> timestamp=1386644682749, value=v1
>
> 002 column=f1:q2,
> timestamp=1386644675585, value=v1
>
> 2 row(s) in 0.0100 seconds
> Here is how boolean argument is accepted:
> {code}
> cache_blocks = args["CACHE_BLOCKS"] || true
> {code}
> Flag for reverse scan should be supported in similar manner
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