Hadoop home path

Question

I am trying to run the below java code on a hadoop server.

javac -classpath ${HADOOP_HOME}/hadoop-${HADOOP_VERSION}-core.jar -d wordcount_classes WordCount.java

but I am not able to locate {HADOOP_HOME}. I tried with hadoop -classpath but it is giving output as below:

/etc/hadoop/conf:/usr/lib/hadoop/lib/*:/usr/lib/hadoop/.//*:/usr/lib/hadoop-hdfs/./:/usr/lib/hadoop-hdfs/lib/*:/usr/lib/hadoop-hdfs/.//*:/usr/lib/hadoop-yarn/.//*:/usr/lib/hadoop-0.20-mapreduce/./:/usr/lib/hadoop-0.20-mapreduce/lib/*:/usr/lib/hadoop-0.20-mapreduce/.//*

Answer 1

you can manually input the hadoop home path in the .bashrc file and make sure the same path is there in all these files (coresite, env.sh, hdfssite and yarnsite, mapred)

Comments

export HADOOP_HOME=/usr/lib/hadoop-2.7.3
export HADOOP_CONF_DIR=/usr/lib/hadoop-2.7.3/etc/hadoop
export HADOOP_MAPRED_HOME=/usr/lib/hadoop-2.7.3
export HADOOP_COMMON_HOME=/usr/lib/hadoop-2.7.3
export HADOOP_HDFS_HOME=/usr/lib/hadoop-2.7.3
export YARN_HOME=/usr/lib/hadoop-2.7.3
export PATH=$PATH:/usr/lib/hadoop-2.7.3/bin


export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_151
export PATH=$JAVA_HOME/bin:$PATH