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https://issues.apache.org/jira/browse/HDFS-1148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14712727#comment-14712727
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Yong Zhang commented on HDFS-1148:
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Failed unit tests: hadoop.hdfs.TestFileStatus is not related to this patch
> Convert FSDataset to ReadWriteLock
> ----------------------------------
>
> Key: HDFS-1148
> URL: https://issues.apache.org/jira/browse/HDFS-1148
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode, performance
> Reporter: Todd Lipcon
> Assignee: Yong Zhang
> Attachments: HDFS-1148.001.patch, HDFS-1148.002.patch,
> HDFS-1148.003.patch, hdfs-1148-old.txt, hdfs-1148-trunk.txt,
> patch-HDFS-1148-rel0.20.2.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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