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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2014/09/30 09:54:34 UTC

[jira] [Comment Edited] (HBASE-12116) Hot contention spots; writing

    [ https://issues.apache.org/jira/browse/HBASE-12116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14152914#comment-14152914 ] 

stack edited comment on HBASE-12116 at 9/30/14 7:54 AM:
--------------------------------------------------------

Some small items of contention; cache the max row size so we don't look it up each time which is contentious when lots of threads reading and then stringify exception has us resizing backing array repeatedly which shows in the sampling window I ran because many NSREs going on.


was (Author: stack):
Some small items of contention; cache the max row size so we don't look it up each time which is contentious when lots of threads reading and then stringify exception has us resizing backing array repeatedly.

> 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.stringify.and.cache.scanner.maxsize.txt, Screen Shot 2014-09-29 at 5.12.51 PM.png
>
>
> Playing with flight recorder, here are some write-time contentious synchronizations/locks (picture coming)



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