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https://issues.apache.org/jira/browse/HADOOP-9022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496174#comment-13496174
]
Hudson commented on HADOOP-9022:
--------------------------------
Integrated in Hadoop-Hdfs-trunk #1225 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1225/])
HADOOP-9022. Hadoop distcp tool fails to copy file if -m 0 specified
(Jonathan Eagles vai bobby) (Revision 1408488)
Result = SUCCESS
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1408488
Files :
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
*
/hadoop/common/trunk/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpOptions.java
*
/hadoop/common/trunk/hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/TestOptionsParser.java
> 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
> Fix For: 3.0.0, 2.0.3-alpha, 0.23.5
>
> 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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