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https://issues.apache.org/jira/browse/HBASE-7474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13542617#comment-13542617
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Anil Gupta commented on HBASE-7474:
-----------------------------------
[~ted_yu]
My implementation is purely based on Sorting on a column value. That previous
comment was just an example. My implementation also takes the startIndex and
pageSize. So, it handles more than Top N. If accidentally, it suffices
HBASE-5982, then it's great!
Ted: I think the above assumption is not realistic. The rows would spread
across 10 regions.
Anil: It depends on the use case. Obviously, a scan can span 10 or more region
also. In my use case, barely a request will even span more than 2-3
regions(around 2-3 million records with scan range). HBase has wide variety of
use-case so using this feature is at user discretion.
I developed this feature for one of my use case. I thought that this would be a
good additional feature in HBase. Hence, i decided to commit it. I am not
trying to push this forcefully into HBase distrinution. If it doesn't seems
like a perfect fit then please let me know.
> Endpoint Implementation to support Scans with Sorting of Rows based on column
> values(similar to "order by" clause of RDBMS)
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-7474
> URL: https://issues.apache.org/jira/browse/HBASE-7474
> Project: HBase
> Issue Type: New Feature
> Components: Coprocessors, Scanners
> Affects Versions: 0.94.3
> Reporter: Anil Gupta
> Priority: Minor
> Labels: coprocessors, scan, sort
> Fix For: 0.94.5
>
> Attachments: SortingEndpoint_high_level_flowchart.pdf
>
>
> Recently, i have developed an Endpoint which can sort the Results(rows) on
> the basis of column values. This functionality is similar to "order by"
> clause of RDBMS. I will be submitting this Patch for HBase0.94.3
> I am almost done with the initial development and testing of feature. But, i
> need to write the JUnits for this. I will also try to make design doc.
> Thanks,
> Anil Gupta
> Software Engineer II, Intuit, inc
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