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From "Haiyang Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-9022) Hadoop distcp tool fails to copy file if -m 0 specified
Date Fri, 09 Nov 2012 04:02:12 GMT
Haiyang Jiang created HADOOP-9022:
-------------------------------------

             Summary: Hadoop distcp tool fails to copy file if -m 0 specified
                 Key: HADOOP-9022
                 URL: https://issues.apache.org/jira/browse/HADOOP-9022
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 0.23.4, 0.23.3, 0.23.1
            Reporter: Haiyang Jiang


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()));

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