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Yong Zhang commented on HDFS-1148: ---------------------------------- Yes, but I think we still have some apps with remote reading. Can you please assert this task to me or I will take it? and same for HDFS-3767. > 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: Dave Thompson > Attachments: 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)