Good catch. Please file a JIRA ticket here: https://issues.apache.org/jira/browse/YARN <https://issues.apache.org/jira/browse/YARN>. Please put a patch up too if you can!
The second property is a configuration for MR jobs to figure out where the MapReduce framework libraries are. Thanks +Vinod > On May 14, 2019, at 4:43 AM, Vishva Avu <avishv...@gmail.com> wrote: > > 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
