Fwd: Issue in docs page : single cluster yarn setup - https://hadoop.apache.org/docs/r3.2.0/hadoop-project-dist/hadoop-common/SingleCluster.html#YARN_on_Single_Node

[Vishva Avu]

Hi,

Step 1 for
https://hadoop.apache.org/docs/r3.2.0/hadoop-project-dist/hadoop-common/SingleCluster.html#YARN_on_Single_Node

Configure parameters as follows:

etc/hadoop/mapred-site.xml:

<configuration>
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
</configuration>

<configuration>
    <property>
        <name>mapreduce.application.classpath</name>
        
<value>$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/*:$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/lib/*</value>
    </property>
</configuration>

but setting this will throw an error when running yarn :

2019-05-14 16:32:05,815 ERROR org.apache.hadoop.conf.Configuration: error
parsing conf mapred-site.xml
com.ctc.wstx.exc.WstxParsingException: Illegal to have multiple roots
(start tag in epilog?).

This should be modified to
<configuration>
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
    <property>
        <name>mapreduce.application.classpath</name>
        
<value>$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/*:$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/lib/*</value>
    </property>
</configuration>

and also what is the function of second property here ?

I could not find the issues page where I can log this, so mailing it here

Regards,
Vishva