How can I run Hadoop run with a Java class?

Question

I am following the book Hadoop: the definitive Guide.

I am confused on example 3-1.

There is a Java source file, URLCat.java. I use javac to co

Answer 1

Go to the directory where your compiled .class files are residing.

Use full class name including package name (refer to Receiving "wrong name" NoClassDefFoundError when executing a Java program from the command-line for full class name or which directory to run the job in) when running hadoop URLCat hdfs://localhost/user/tom/quangle.txt.

In my case URLCat.java was in com.tom.app, so the hadoop command was hadoop com.tom.app.URLCat hdfs://localhost/user/tom/quangle.txt.