How to run Java file in Hadoop

Question

I have a Java code and I have created a jar of it so that I can run it from inside Hadoop. Now I am trying to run it using this:

% hadoop URLCat hdfs://localhost/user/hadoop/values.txt

% hadoop jar URLCat.jar 

But this throws error:

Exception in thread "main" java.lang.ClassNotFoundException: hdfs://localhost/user/hadoop/values/txt

Answer 1

Try this:

hadoop fs -cat hdfs:///user/hadoop/values.txt