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https://issues.apache.org/jira/browse/HDFS-1148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009940#comment-13009940
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dhruba borthakur commented on HDFS-1148:
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I too have figured out lately that for these type of locks, non-fair mode is
much better performance.
> Convert FSDataset to ReadWriteLock
> ----------------------------------
>
> Key: HDFS-1148
> URL: https://issues.apache.org/jira/browse/HDFS-1148
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hdfs-1148-old.txt
>
>
> In benchmarking HDFS-941 I noticed that for the random read workload, the
> FSDataset lock is highly contended. After converting it to a
> ReentrantReadWriteLock, I saw a ~25% improvement on both latency and
> ops/second.
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