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From smith jack <thinke...@gmail.com>
Subject Re: Hadoop basics
Date Sun, 15 Aug 2010 03:49:30 GMT
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 <crystaldoll06@gmail.com>:
> 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! :)
>

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