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https://issues.apache.org/jira/browse/HDFS-1796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13013001#comment-13013001
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Nathan Roberts commented on HDFS-1796:
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I'm certainly not an expert on these two locks so there may not be anything to
gain from this comment. If either of these locks can be heavily contended, then
it might make sense to run something which exercises this contention to make
sure the change doesn't cause our latency tail to grow dramatically.
> 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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