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I have set up Hadoop on my laptop and ran the example program given in the installation guide successfully. But, I am not able to run a program. rohit@renaissance1:~/hadoop/ch2$ hadoop MaxTemperature input/ncdc/sample.txt output Exception in thread "main" java.lang.NoClassDefFoundError: MaxTemperature Caused by: java.lang.ClassNotFoundException: MaxTemperature at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) Could not find the main class: MaxTemperature. Program will exit. The book said that we should set a Hadoop Classpath by writing rohit@renaissance1:~/hadoop/ch2$ export HADOOP_CLASSPATH=build/classes The main class is defined in MaxTemperature.java file that I am executing. How do we set the Hadoop Classpath? Do we have to do it for all program execution or only once? Where should I put the input folder. My code is at /home/rohit/hadoop/ch2 and my Hadoop installation is at /home/hadoop.

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