[YARN-9555] Yarn Docs : single cluster yarn setup - Step 1 configure parameters - multiple roots

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 3.0.2
• Component/s: yarn
• Assignee: Unassigned
• Reporter: Vishva
• Created: 15/May/19 02:50
• Updated: 16/May/19 04:59
• Resolved: 16/May/19 01:34

Description

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>

Issue Links

• duplicates: MAPREDUCE-7165 mapred-site.xml is misformatted in single node setup document