Ahmad Shahzad wrote:
> So, there can be two things, I can either add a new java file OR i can
> change the existing java files.
> 
> Can you please explain it further. So, if i add a new java file in suppose,
> src\mapred\org\apache\hadoop\mapred\test.java. than how am i suppose to
> build it? just use ant build.xml ???
> 
> And if i change suppose src\mapred\org\apache\hadoop\mapred/TaskTracker.java
> file than how am i suppose to build ?
> 

yes, just like any other ant based project.

Before you get in deep editing the TaskTracker, how much big project 
java coding and testing have you done? I don't want to scare you but 
Hadoo is big and complex and it's a tricky place to learn your way 
around the tools