Hello, I have downloaded from the Apache web site the Hadoop.1.1.2, the current stable version. Then I simply used the command of:
ant -Dcompile-core=true to try to build the Hadoop core. After the successful compilation, I used the diff tool to try to compare the hardoop-core.jar that I just built, with the one comes with the Hadoop-1.1.2 tar.gz from the Apache web site. I see a lot of class files are different in my compiled JAR file and the ones from the hadoop-1.1.2.tar.gz from the Apache Web site. Then I picked, for example, the class: org/apache/hadoop/security/UserGroupInformation.class, and used md5sum to make the comparison, and confirmed that the file content is really different for two class files. My java compiler is Sun Java build 1.6.0_45-b06. I like to know what is the correct command to invoke ANT to compile the java code from the Hadoop Source code. Thank you! Jun
