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MapReduce Tutorial : Preparing the environment

To use the Hadoop Java API, you must be able to compile the Java sources with the Hadoop library. An easy way is to use a prepared Makefile:

  1. Create a directory for the Java sources.
  2. Create a Makefile containing
    Makefile
    include /net/projects/hadoop/java/Makefile

When typing make, every Java file is compiled (with the Hadoop library and some extra classes) to a jar file. It is of course possible to compile just selected sources using make file1.jar file2.jar.

Command make clean remove for every Java file its jar file and subdirectory with compiled classes.

Exercise

Create a directory and a Makefile as described and download WordCount.java. Try compiling it using make.

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