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https://issues.apache.org/jira/browse/HBASE-9668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13779583#comment-13779583
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Ted Yu commented on HBASE-9668:
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In Phoenix, there is ScanRegionObserver#getTopNScanner().
The concept of small scan is applicable to region scanner that does TopN.
> Apply small scan to Scan's used by AggregationClient
> ----------------------------------------------------
>
> Key: HBASE-9668
> URL: https://issues.apache.org/jira/browse/HBASE-9668
> Project: HBase
> Issue Type: Improvement
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: 9668-v1.txt
>
>
> The Scan objects used to construct AggregateRequest's for aggregates
> supported by AggregationClient qualify as small scan because response from
> each region is small.
> We should utilize small scan for better performance.
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