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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