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  1. Hadoop HDFS
  2. HDFS-1148

Convert FSDataset to ReadWriteLock

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Details

    • Improvement
    • Status: Patch Available
    • Major
    • Resolution: Unresolved
    • None
    • None
    • datanode, performance
    • None

    Description

      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.

      Attachments

        1. hdfs-1148-old.txt
          12 kB
          Todd Lipcon
        2. patch-HDFS-1148-rel0.20.2.txt
          12 kB
          Dave Thompson
        3. hdfs-1148-trunk.txt
          46 kB
          Todd Lipcon
        4. HDFS-1148.001.patch
          55 kB
          Yong Zhang
        5. HDFS-1148.002.patch
          55 kB
          Yong Zhang
        6. HDFS-1148.003.patch
          55 kB
          Yong Zhang

        Issue Links

          is related to

          Improvement - An improvement or enhancement to an existing feature or task. HDFS-1599 Umbrella Jira for Improving HBASE support in HDFS

          • Major - Major loss of function.
          • Open

          Improvement - An improvement or enhancement to an existing feature or task. HDFS-941 Datanode xceiver protocol should allow reuse of a connection

          • Major - Major loss of function.
          • Closed
          relates to

          Improvement - An improvement or enhancement to an existing feature or task. HDFS-3767 Finer grained locking in DN

          • Major - Major loss of function.
          • Open

          Activity

            People

              zhangyongxyz Yong Zhang
              tlipcon Todd Lipcon
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              Dates

                Created:
                Updated: