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From "Andrew Purtell (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3280) DFSOutputStream.sync should not be synchronized
Date Sat, 14 Apr 2012 02:39:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253942#comment-13253942
] 

Andrew Purtell commented on HDFS-3280:
--------------------------------------

Ah, so this explains what you guys thought might be an interaction with Nagle?
                
> DFSOutputStream.sync should not be synchronized
> -----------------------------------------------
>
>                 Key: HDFS-3280
>                 URL: https://issues.apache.org/jira/browse/HDFS-3280
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 2.0.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>         Attachments: hdfs-3280.txt
>
>
> HDFS-895 added an optimization to make hflush() much faster by unsynchronizing it. But,
we forgot to un-synchronize the deprecated {{sync()}} wrapper method. This makes the HBase
WAL really slow on 0.23+ since it doesn't take advantage of HDFS-895 anymore.

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