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https://issues.apache.org/jira/browse/HBASE-12116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14496031#comment-14496031
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Nicolas Liochon commented on HBASE-12116:
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I had a look at crc a while ago.
My understanding back then was that there are specific instruction in x86
processors to calculate crc, unfortunately a little bit different than the
standard crc32. When I was looking at Intel/Hadoop roadmap 2 years ago, it
looked like Intel was planning to do the changes in hadoop to use the hw one.
There are some info here: http://www.strchr.com/crc32_popcnt
> Hot contention spots; writing
> -----------------------------
>
> Key: HBASE-12116
> URL: https://issues.apache.org/jira/browse/HBASE-12116
> Project: HBase
> Issue Type: Bug
> Reporter: stack
> Assignee: stack
> Attachments: 12116.checkForReplicas.txt,
> 12116.stringify.and.cache.scanner.maxsize.txt, 12116.txt, Screen Shot
> 2014-09-29 at 5.12.51 PM.png, Screen Shot 2014-09-30 at 10.39.34 PM.png,
> Screen Shot 2015-04-13 at 2.03.05 PM.png, perf.write3.svg, perf.write4.svg
>
>
> Playing with flight recorder, here are some write-time contentious
> synchronizations/locks (picture coming)
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