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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1148) Convert FSDataset to ReadWriteLock
Date Wed, 12 May 2010 09:00:45 GMT
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

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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