Hi! I am a total beginner, but I am very interested in hadoop. I've already downloaded hadoop 0.19.2 and run on Ubuntu in single-node mode. Now I want to do two things:
1. Explore how hadoop works internally with one of the example applications hadoop provides 2. Write an application on my own Those two things bring me following questions: a. debugger? I am stuck since I don't know how to "explore" hadoop. I used to trace through the code using a debugger, but in this case, I don't know if there is a good debugger to use; or -- maybe a debugger is not necessary for hadoop? If not, then how do you trace through the code to either debug or just gain an understanding about the system? May I know what you, experienced experts, do? :) b. Where to run hadoop? Also -- may I know where you run your hadoop? Do you run on linux, or on VM -- in particular, Cloudera? I heard that Cloudera is good for writing mapreduce applications with hadoop itself as a blackbox; is it true? If my ultimate goal is to understand how hadoop works internally, would it be better if I directly run it on linux? c. Single-node or multi-node? In the beginning (just like my case :p) would it be better to use single-node or multi-node? If the latter is true, should I obtain more machines, or should I use more virtual machines to create more nodes? As a newbie, I am sorry for all those basic (and silly, I know :$) questions. If possible, please help me out? Any suggestion or advice will be greatly appreciated. Thank you very much! Best, Rita :) P.S. If my questions are not suitable for this mailing-list, please let me apologize, and then, could you please direct me to other mailing-lists? Sorry, and thanks a lot! :)
