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https://issues.apache.org/jira/browse/HBASE-12116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved HBASE-12116.
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Resolution: Fixed
> Hot contention spots; writing
> -----------------------------
>
> Key: HBASE-12116
> URL: https://issues.apache.org/jira/browse/HBASE-12116
> Project: HBase
> Issue Type: Improvement
> Components: Performance
> Reporter: Michael Stack
> Assignee: Michael Stack
> Priority: Major
> 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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