10. Configure YARN and MapReduce

After you install Hadoop, modify your configs.

  1. Upload the MapReduce tarball to HDFS. As the HDFS user, for example hdfs:

    hdfs dfs -mkdir -p /hdp/apps/2.2.0.0-<$version>/mapreduce/

    hdfs dfs -put /usr/hdp/2.2.0.0-<$version>/hadoop/mapreduce.tar.gz /hdp/apps/2.2.0.0-<$version>/mapreduce/

    hdfs dfs -chown -R hdfs:hadoop /hdp

    hdfs dfs -chmod -R 555 /hdp/apps/2.2.0.0-<$version>/mapreduce

    hdfs dfs -chmod -R 444 /hdp/apps/2.2.0.0-<$version>/mapreduce/mapreduce.tar.gz

  2. Make the following changes to mapred-site.xml:

    • Add the following property:

       <property>
       <name>mapreduce.admin.map.child.java.opts</name>
       <value>-server -Djava.net.preferIPv4Stack=true -Dhdp.version=${hdp.version}</value>
       <final>true</final>
      </property>
      [Note]Note

      You do not need to modify ${hdp.version}.

    • Modify the following existing properties to include ${hdp.version}:

      <property>
       <name>mapreduce.admin.user.env</name> 
       <value>LD_LIBRARY_PATH=/usr/hdp/${hdp.version}/hadoop/lib/native:/usr/hdp/${hdp.version}/hadoop/lib/native/Linux-amd64-64</value>
      </property>
       
      </property>
       <name>mapreduce.admin.map.child.java.opts</name>
       <value>-server -Djava.net.preferIPv4Stack=true -Dhdp.version=${hdp.version}</value>
       <final>true</final>
      </property>
       
      </property>
       <name>mapreduce.admin.reduce.child.java.opts</name>
       <value>-server -Djava.net.preferIPv4Stack=true -Dhdp.version=${hdp.version}</value>
       <final>true</final>
      </property>
       
      </property>
       <name>mapreduce.application.framework.path</name>
       <value>/hdp/apps/${hdp.version}/mapreduce/mapreduce.tar.gz#mr-framework</value>
      </property>
       
      </property>
       <name>mapreduce.application.classpath</name>
       <value>$PWD/mr-framework/hadoop/share/hadoop/mapreduce/*:
         $PWD/mr-framework/hadoop/share/hadoop/mapreduce/lib/*:
         $PWD/mr-framework/hadoop/share/hadoop/common/*:
         $PWD/mr-framework/hadoop/share/hadoop/common/lib/*:
         $PWD/mr-framework/hadoop/share/hadoop/yarn/*:
         $PWD/mr-framework/hadoop/share/hadoop/yarn/lib/*:
         $PWD/mr-framework/hadoop/share/hadoop/hdfs/*:
         $PWD/mr-framework/hadoop/share/hadoop/hdfs/lib/*:
        /usr/hdp/${hdp.version}/hadoop/lib/hadoop-lzo-0.6.0.${hdp.version}.jar:
        /etc/hadoop/conf/secure</value>
      </property>
      [Note]Note

      You do not need to modify ${hdp.version}.

  3. Add the following property to yarn-site.xml:

    <property>
     <name>yarn.application.classpath</name>
     <value>$HADOOP_CONF_DIR,/usr/hdp/${hdp.version}/hadoop-client/*,
       /usr/hdp/${hdp.version}/hadoop-client/lib/*,
       /usr/hdp/${hdp.version}/hadoop-hdfs-client/*,
       /usr/hdp/${hdp.version}/hadoop-hdfs-client/lib/*,
       /usr/hdp/${hdp.version}/hadoop-yarn-client/*,
       /usr/hdp/${hdp.version}/hadoop-yarn-client/lib/*</value>
    </property>
  4. For secure clusters, you must create and configure the container-executor.cfg configuration file:

    • Create the container-executor.cfg file in /etc/hadoop/conf/.

    • Insert the following properties:

      yarn.nodemanager.linux-container-executor.group=hadoop
      banned.users=hdfs,yarn,mapred
      min.user.id=1000
      • yarn.nodemanager.linux-container-executor.group - Configured value of yarn.nodemanager.linux-container-executor.group. This must match the value of yarn.nodemanager.linux-container-executor.group in yarn-site.xml.

      • banned.users - Comma-separated list of users who can not run container-executor.

      • min.user.id - Minimum value of user id. This prevents system users from running container-executor.

      • allowed.system.users - Comma-separated list of allowed system users.

    • Set the file /etc/hadoop/conf/container-executor.cfg file permissions to only be readable by root:

      chown root:hadoop /etc/hadoop/conf/container-executor.cfg

      chmod 400 /etc/hadoop/conf/container-executor.cfg

    • Set the container-executor program so that only root or hadoop group users can run it:

      chown root:hadoop /usr/hdp/${hdp.version}/hadoop-yarn-server-nodemanager/bin /container-executor

      chmod 6050 /usr/hdp/${hdp.version}/hadoop-yarn-server-nodemanager/bin /container-executor


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