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From "Jonathan Eagles (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-9022) Hadoop distcp tool fails to copy file if -m 0 specified
Date Mon, 12 Nov 2012 21:41:12 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-9022?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Eagles updated HADOOP-9022:
------------------------------------

    Status: Patch Available  (was: Open)
    
> 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
>            Assignee: Jonathan Eagles
>         Attachments: HADOOP-9022.patch
>
>
> 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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