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https://issues.apache.org/jira/browse/HBASE-14539?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-14539:
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Attachment: 14539-0.98.txt
Here's a trivial patch. Makes absolutely sure we do no work (other than the
compares in the switch statements) unless we need to do any.
I measured a 3-5% improvement in some cases.
Trivial patch, no functional change. Will commit tomorrow unless I hear
objections.
> Slight improvement of StoreScanner.optimize
> -------------------------------------------
>
> Key: HBASE-14539
> URL: https://issues.apache.org/jira/browse/HBASE-14539
> Project: HBase
> Issue Type: Sub-task
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Minor
> Fix For: 2.0.0, 1.3.0, 0.98.15, 1.2.1, 1.0.3, 1.1.3
>
> Attachments: 14539-0.98.txt
>
>
> While looking at the code I noticed that StoreScanner.optimize does not some
> unnecessary work. This is a very tight loop and even just looking up a
> reference can throw off the CPUs cache lines. This does safe a few percent of
> performance (not a lot, though).
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