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https://issues.apache.org/jira/browse/HDFS-1796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012774#comment-13012774
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Aaron T. Myers commented on HDFS-1796:
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Hi Hairong, can you post the details of your experiment? What was done and what
results did you achieve?
> Switch NameNode to use non-fair locks
> -------------------------------------
>
> Key: HDFS-1796
> URL: https://issues.apache.org/jira/browse/HDFS-1796
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Hairong Kuang
> Attachments: non-fair-lock.patch
>
>
> According to JavaDoc, a non-fair lock will normally have higher throughput
> than a fair lock. Our experiment also shows an improved performance when
> using a non-fair lock. We should switch namenode to use non-fair locks.
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