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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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