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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12116) Hot contention spots; writing
Date Tue, 14 Apr 2015 14:33:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14494162#comment-14494162
] 

Andrew Purtell commented on HBASE-12116:
----------------------------------------

bq. We has ACL audit on. Thats 2% of CPU according to perf.
AccessController? Let's look, but 2-3% of perf is performance to design expectations, so that's
actually good

> 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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