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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-12116) Hot contention spots; writing
Date Wed, 01 Oct 2014 05:39:35 GMT

     [ https://issues.apache.org/jira/browse/HBASE-12116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-12116:
--------------------------
    Attachment: 12116.checkForReplicas.txt

Don't check for replica count after every successful sync.  They cost, especially when contention
as all threads pile up on DFSOutputStream synchronized get replicas count.

> 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
>
>
> Playing with flight recorder, here are some write-time contentious synchronizations/locks
(picture coming)



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