Hi, For my research project, I need to modify Hadoop JobTracker to collect some statistics of TaskTracker nodes. For example, I would like to piggy-back heartbeat messages sent from TaskTrackers to JobTracker with some extra information related to the resource utilization and other statistics. I am able to checkout Hadoop common code base and build in Eclipse. Specifically, which files should I look at, and after the above mentioned modification, how to collect the statistics?
Thanks, Bikash
