Could not find or load main class org.apache.hadoop.hdfs.server.namenode.Namenode

Question

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>

Answer 1

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.