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  1. Hadoop Common
  2. HADOOP-11785

Reduce number of listStatus operation in distcp buildListing()

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Details

    • Improvement
    • Status: Resolved
    • Minor
    • Resolution: Fixed
    • 3.0.0-alpha1
    • 2.8.0, 3.0.0-alpha1
    • tools/distcp
    • None

    Description

      Distcp was taking long time in copyListing.buildListing() for large source trees (I was using source of 1.5M files in a tree of about 50K directories). For input at s3 buildListing was taking more than one hour. I've noticed a performance bug in the current code which does listStatus twice for each directory which doubles number of RPCs in some cases (if most directories do not contain >1000 files).

      Attachments

        1. distcp-liststatus.patch
          6 kB
          Zoran Dimitrijevic
        2. distcp-liststatus2.patch
          4 kB
          Zoran Dimitrijevic

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          People

            3opan Zoran Dimitrijevic
            3opan Zoran Dimitrijevic
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              Updated:
              Resolved:

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