title: How to create the hadoop-0.21.0-core.jar using the source code?
body: <p>How to create the hadoop-0.21.0-core.jar using the source code?
  I have check out the source code from svn. Now I have three dirs common,hdfs,mapred
  I want to build the hadoop-0.21.0-core.jar to run a hadoop program..can you help me?</p>