[jira] [Commented] (MAPREDUCE-5459) Update the doc of running MRv1 examples jar on YARN

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13740234#comment-13740234 ] 

Hadoop QA commented on MAPREDUCE-5459:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12598061/MAPREDUCE-5459.1.patch
  against trunk revision .

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

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {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:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core.

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3942//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3942//console

This message is automatically generated.
                
> Update the doc of running MRv1 examples jar on YARN
> ---------------------------------------------------
>
>                 Key: MAPREDUCE-5459
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5459
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>         Attachments: MAPREDUCE-5459.1.patch
>
>
> In addition to adding two env vars: HADOOP_USER_CLASSPATH_FIRST and HADOOP_CLASSPATH, we still need to add
> {code}
>     <property>
>         <name>mapreduce.job.user.classpath.first</name>
>         <value>true</value>
>     </property>
> {code}
> in mapred-site.xml to make sure that the MRv1 examples jar runs correctly on YARN. Some examples will use Java reflection to find the classes in the examples jar dynamically when they are running. With this configuration, the MRv1 examples jar will appear before the MRv2 examples jar in CLASSPATH of the processes in YARN containers. Therefore, the classes found via reflection will be picked from MRv1 examples jar instead of MRv2 examples jar as well.
> MapReduce_Compatibility_Hadoop1_Hadoop2.apt.vm needs to be updated to document this.

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