I am not an experienced Hadoop programmer, but what I found was that building and debugging Hadoop under Eclipse was very difficult, and I was never to make it work correctly. I suggest using the well documented command-line Maven build, installing Hadoop from that build, and running it normally. Once you have that working, run your namemode or datanode daemon so as to wait for a remote debugger attach before starting. You should also get comfortable with log4j, the logging framework used by Hadoop, as those log files are often your best friend when trying to debug a collection of services.
From: Karim Awara [mailto:[EMAIL PROTECTED]]
Sent: Sunday, October 06, 2013 5:41 AM
Subject: Hadoop 2.x with Eclipse
I followed the instructions on how to import hadoop files to Eclipse (I am using hadoop 2.1 beta).
Currently on my machine, I have hadoop 2.1 installed.. and its source code is imported on Eclipse. What I can't grasp is how to proceed from there?
I want to modify HDFS code (blockplacement strategy).. Now building hdfs project via generates errors to me (unresolved types in hadoop common). and if i built successfully, how to test my modified code?
Karim Ahmed Awara
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