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https://issues.apache.org/jira/browse/HBASE-15452?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-15452:
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Attachment: 15452-0.98.txt
Oops. Here it is. Trivial.
> Consider removing checkScanOrder from StoreScanner.next
> -------------------------------------------------------
>
> Key: HBASE-15452
> URL: https://issues.apache.org/jira/browse/HBASE-15452
> Project: HBase
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Attachments: 15452-0.98.txt
>
>
> In looking why we spent so much time in StoreScanner.next when doing a simple
> Phoenix count\(*) query I came across checkScanOrder. Not only is this a
> function dispatch (that the JIT would eventually inline), it also requires
> setting the prevKV member for every Cell encountered.
> Removing that logic a yields measurable end-to-end improvement of 5-20% (in
> 0.98).
> I will repeat this test on my work machine tomorrow.
> I think we're stable enough to remove that check anyway.
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