Zhijie Shen created MAPREDUCE-5459:
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Summary: 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
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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