@Aishwarya Sudhakar nn is namenode, you will find it in the core-site.xml properties under fs.defaultFS. but i think your issue as i mentioned earlier is you have saved your file without '/' in the beginning of "demo" directory, it got saved into the user home, look at the output of "hdfs dfs -ls demo/data.csv and it will display the user home it is in, use either that or mv it to the root like this: hdfs dfs -mv demo/dataset.csv /demo/dataset.csv make sure your /demo directory exists, if not create it: hdfs dfs -mkdir /demo Hope this helps.
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