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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2010/05/12 11:00:45 UTC

[jira] Created: (HDFS-1148) Convert FSDataset to ReadWriteLock

Convert FSDataset to ReadWriteLock
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                 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


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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