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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9022) Hadoop distcp tool fails to copy file if -m 0 specified
Date Mon, 12 Nov 2012 22:23:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495686#comment-13495686
] 

Hadoop QA commented on HADOOP-9022:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12553197/HADOOP-9022.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-tools/hadoop-distcp:

                  org.apache.hadoop.tools.TestCopyListing

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/1732//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/1732//console

This message is automatically generated.
                
> 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: 0.23.1, 0.23.3, 0.23.4
>            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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