There is still a long way to go before you start debuging hadoop, the first point is that, you should run hadoop first! how to make this done. simple run bin/start-all, then hadoop can response to your request. you can use FsShell when you begin. hope you will enjoy it
2010/8/15 Rita Liu <[email protected]>: > 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! :) >
