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