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  1. Hadoop Common
  2. HADOOP-6569

FsShell#cat should avoid calling unecessary getFileStatus before opening a file to read

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 0.21.0
    • fs
    • None
    • Incompatible change, Reviewed

    Description

      Since FileSystem#open throws a FileNotFoundException when the file to be read does not exist, there is no need to check if the file is a directory or not before open. In case of HDFS, this could reduce one getFileInfo RPC to NameNode.

      Attachments

        1. optimizeCat.patch
          0.6 kB
          Hairong Kuang
        2. optimizeCat.patch
          0.6 kB
          Hairong Kuang
        3. optimizeCat-yahoo.patch
          0.7 kB
          Hairong Kuang
        4. optimizeCat-yahoo1.patch
          2 kB
          Hairong Kuang
        5. optimizeCat-yahoo2.patch
          3 kB
          Hairong Kuang

        Issue Links

        is related to

        Improvement - An improvement or enhancement to an existing feature or task. HDFS-1016 HDFS side change for HADOOP-6569

        • Major - Major loss of function.
        • Closed

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            hairong Hairong Kuang
            hairong Hairong Kuang
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            Dates

              Created:
              Updated:
              Resolved:

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