Hello all! I try to install hadoop but I have a problem when trying to format data folder with command "hdfs namenode -format". Error: Could not find or load main class Username

Question

I've tried to change the last line from hadoop-env.cmd and writing something else instead "%Username%" but still the same error. Any help, please?

Answer 1

Hey!

The error seems like the problem is in setting a class-path, I would suggest you add the below following in your ~./bashrc

export HADOOP_CLASSPATH=$(hadoop classpath):$HADOOP_CLASSPATH

This should work

Comments

Hey I see your answer works for setting up hadoop in unix, but im getting the same error while setting up hadoop in windows, can this be fixed in windows..?

can you please tell the windows cmd verison of this:

export HADOOP_CLASSPATH=$(hadoop classpath):$HADOOP_CLASSPATH

line?

Massive thanks to whoever helps me

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Hi@shivz,

You don't have to set this in the Windows system I guess. There may be another reason for this. You can check all the configuration steps from the below link.

https://towardsdatascience.com/installing-hadoop-3-2-1-single-node-cluster-on-windows-10-ac258dd48aef