Configure YARN and MapReduce
After you install Hadoop, modify your configs.
As the HDFS user, for example 'hdfs', upload the MapReduce tarball to HDFS.
su - $HDFS_USER hdfs dfs -mkdir -p /hdp/apps/<hdp_version>/mapreduce/ hdfs dfs -put /usr/hdp/current/hadoop-client/mapreduce.tar.gz /hdp/apps/<hdp_version>/mapreduce/ hdfs dfs -chown -R hdfs:hadoop /hdp hdfs dfs -chmod -R 555 /hdp/apps/<hdp_version>/mapreduce hdfs dfs -chmod 444 /hdp/apps/<hdp_version>/mapreduce/mapreduce.tar.gz
Where $HDFS_USER is the HDFS user, for example hdfs, and <hdp_version> is the current HDP version, for example 2.3.6.0.
Copy mapred-site.xml from the companion files and make the following changes to mapred-site.xml:
Add:
<property> <name>mapreduce.admin.map.child.java.opts</name> <value>-server -Djava.net.preferIPv4Stack=true -Dhdp.version=${hdp.version}</value> <final>true</final> </property>
Note 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/${hdp.version}/hadoop/lib/native/Linux-amd64-64</value> </property> <property> <name>mapreduce.application.framework.path</name> <value>/hdp/apps/${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 You do not need to modify ${hdp.version}.
Copy yarn-site.xml from the companion files and modify:
<property> <name>yarn.application.classpath</name> <value>$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>
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
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 execute it:
chown root:hadoop /usr/hdp/${hdp.version}/hadoop-yarn/bin/container-executor chmod 6050 /usr/hdp/${hdp.version}/hadoop-yarn/bin/container-executor