Error in Hadoop Mapreduce

Question

I am writing my first HDFS command and getting error:

hdfs dfs -cat /home/vinay/script/input.txt
WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
cat: `/home/vinay/script/input.txt': No such file or directory

Answer 1

The file that you are referring here is is in the local directory i.e. /home/vinay/script/input.txt

You need to pass the HDFS uri of the file, or the HDFS file system path.

First go to localhost:50070 in your browser and find the path of the file. If the file is not uploaded to HDFS, use this command to upload the file:

 hdfs dfs -put <local-filesystem-file-path> <path-on-hdfs>

Then you can use the below command to print the content of the file present in HDFS:

hdfs dfs -cat <path-on-hdfs>