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  1. Hadoop Common
  2. HADOOP-9022

Hadoop distcp tool fails to copy file if -m 0 specified

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.23.1, 0.23.3, 0.23.4
    • Fix Version/s: 2.0.3-alpha, 0.23.5
    • Component/s: None
    • Labels:
      None

      Description

      When trying to copy file using distcp on H23, if -m 0 is specified, distcp will just spawn 0 mapper tasks and the file will not be copied.
      But this used to work before H23, even when -m 0 specified, distcp will always copy the files.
      Checked the code of DistCp.java
      Before the rewrite, it set the number maps at least to 1
      job.setNumMapTasks(Math.max(numMaps, 1));

      But in the newest code, it just takes the input from user:
      job.getConfiguration().set(JobContext.NUM_MAPS,
      String.valueOf(inputOptions.getMaxMaps()));

        Attachments

        1. HADOOP-9022.patch
          1 kB
          Jonathan Eagles

          Activity

            People

            • Assignee:
              jeagles Jonathan Eagles
              Reporter:
              skywoody Haiyang Jiang
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              Dates

              • Created:
                Updated:
                Resolved: