hi, i am reading hadoop-0.23 source code, mainly focusing on hadoop yarn. However i have some problems in reading the source code. There is no Debugging tools for hadoop, so i can't track the code execution flow. Therefore i can't understand the code quickly since there are lots of overwirte, interface and inheritance. So can anyone give some good suggestions or share your method? I am really appreciate it. Thankyou
-- 陈竞，中科院计算技术研究所，高性能计算机中心 Jing Chen HPCC.ICT.AC China
