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

+1 vote
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?
May 21, 2019 in Big Data Hadoop by anonymous
756 views

1 answer to this question.

+2 votes

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

answered May 22, 2019 by Gitika
• 36,730 points

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

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

Related Questions In Big Data Hadoop

0 votes
1 answer
+1 vote
1 answer
0 votes
1 answer

Hadoop Mapreduce: Error: Could not find or load main class com.sun.tools.javac.Main

You have to add HADOOP_CLASSPATH environment parameter: expor ...READ MORE

answered Oct 30, 2018 in Big Data Hadoop by Omkar
• 69,030 points
1,168 views
0 votes
1 answer

Hadoop MacOS: formatting namenode: Could not find or load main class

You need to point the HADOOP_PREFIX to ...READ MORE

answered Nov 13, 2018 in Big Data Hadoop by Omkar
• 69,030 points
307 views
+1 vote
1 answer

Hadoop Mapreduce word count Program

Firstly you need to understand the concept ...READ MORE

answered Mar 16, 2018 in Data Analytics by nitinrawat895
• 10,950 points
5,828 views
0 votes
1 answer

hadoop.mapred vs hadoop.mapreduce?

org.apache.hadoop.mapred is the Old API  org.apache.hadoop.mapreduce is the ...READ MORE

answered Mar 16, 2018 in Data Analytics by nitinrawat895
• 10,950 points
872 views
+1 vote
11 answers

hadoop fs -put command?

put syntax: put <localSrc> <dest> copy syntax: copyF ...READ MORE

answered Dec 7, 2018 in Big Data Hadoop by Aditya
36,618 views
–1 vote
1 answer

Hadoop dfs -ls command?

In your case there is no difference ...READ MORE

answered Mar 16, 2018 in Big Data Hadoop by kurt_cobain
• 9,320 points
2,184 views