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"Command not found" message while executing "hadoop namenode -format"

Liam Parker |

I have followed this tutorial for my hadoop setup up to "Format the new Hadoop File System" and I get the "Command not found" message when I enter 

hadoop namenode -format

How should I proceed?

2

7 Answers

In your ~/.bashrc, instead of writing 

export HADOOP_INSTALL=/usr/local/hadoop

change it to 

export HADOOP_INSTALL=/usr/local/hadoop/bin/hadoop

I was facing the same issue for a long time. This worked for me.

Or try this: 

/usr/local/hadoop/bin/hadoop namenode -format

Re-do everything from the beginning. It may be possible that you have not set the path properly. As the output says Command not found, this means hadoop has not been installed properly.

3

You can try 

/usr/local/hadoop/bin/hadoop namenode -format

If you want to use hadoop command without specifying the path you can edit your ~/.bashrc file. If you have alredy done it, reopen your terminal and try it again.

I also did the same installation and actually the path is /usr/local/hadoop/hadoop-2.6.0/hadoop/ so you should move everything from /usr/local/hadoop/hadoop-2.6.0/ to /usr/local/hadoop so that the hadoop command will work.

Command to move everything is

mv -v /usr/local/hadoop/hadoop-2.6.0/* /usr/local/hadoop

It worked for me.

If path is correct and still facing the error

then

after adding path variables in ~/.bashrc

run this command source ~/.bashrc

Set your path:

sudo gedit /etc/profile

Add to end:

export HADOOP_PREFIX="/usr/local/hadoop/"
export PATH=$PATH:$HADOOP_PREFIX/bin
export PATH=$PATH:$HADOOP_PREFIX/sbin
export HADOOP_MAPRED_HOME=${HADOOP_PREFIX}
export HADOOP_COMMON_HOME=${HADOOP_PREFIX}
export HADOOP_HDFS_HOME=${HADOOP_PREFIX}
export YARN_HOME=${HADOOP_PREFIX}

Then,

source /etc/profile

Make sure all your environment variables are set correctly and HADOOP can find JAVA. And Include both in your PATH. Assuming you have Java and Hadoop under /usr/local/ like me,

Add these to the very end of your ~./bashrc file.

export JAVA_HOME=/usr/local/jdk1.8.0_171
export PATH=${PATH}:${JAVA_HOME}/bin
export HADOOP_INSTALL=/usr/local/hadoop
export HADOOP_HOME=/usr/local/hadoop
export PATH=${PATH}:${HADOOP_INSTALL}/bin:${HADOOP_HOME}/bin

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