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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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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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