Could not find or load main class org.apache.hadoop.hdfs.server.namenode.Namenode
hadoop
Solution
For anyone still having trouble, you need to export the `HADOOP_PREFIX` environment variable.
Add the following line to your `~/.bashrc` file:
export HADOOP_PREFIX=/path_to_hadoop_location
# for example:
# export HADOOP_PREFIX=/home/mike/hadoop-2.7.1
Then do `. ~/.bashrc` in your terminal and try again, this will fix the error.
Problem
I know this has been asked before but I could not figure out the solution. I am getting the below error when I am trying to run `hdfs name node -format`: Could not find or load main class org.apache.hadoop.hdfs.server.namenode.Namenode I followed the instructions from this website to install on my centos machine. The only difference is that I installed using root instead of hadoopuser as mentioned in the link. Bashrc ``` # User specific aliases and functions export JAVA_HOME=/usr/lib/jvm/jre-1.7.0-openjdk.x86_64/ export HADOOP_INSTALL=/usr/local/hadoop export HADOOP_MAPRED_HOME=$HADOOP_INSTALL export HADOOP_COMMON_HOME=$HADOOP_INSTALL export HADOOP_HDFS_HOME=$HADOOP_INSTALL export YARN_HOME=$HADOOP_INSTALL export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_INSTALL/lib/native export PATH=$PATH:$HADOOP_INSTALL/sbin export PATH=$PATH:$HADOOP_INSTALL/bin ``` hadoop-env.sh ``` export JAVA_HOME=/usr/lib/jvm/jre-1.7.0-openjdk.x86_64/ ``` Mapred ``` <property> <name>mapreduce.framework.name</name> <value>yarn</value> </property> ``` Yarn-site.xml ``` <property> <name>yarn.nodemanager.aux-services</name> <value>mapreduce_shuffle</value> </property> ``` core-site.xml ``` <property> <name>fs.default.name</name> <value>hdfs://localhost:9000</value> </property> ``` hdfs-site.xml ``` <property> <name>dfs.replication</name> <value>1</value> </property> <property> <name>dfs.name.dir</name> <value>file:///home/hadoopspace/hdfs/namenode</value> </property> <property> <name>dfs.data.dir</name> <value>file:///home/hadoopspace/hdfs/datanode</value> </property> ```