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MapReduce, mail # user - How to pull data in the Map/Reduce functions?


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Re: How to pull data in the Map/Reduce functions?
Praveen Sripati 2011-09-24, 16:56
Matt,

Neither of the books have much information about the new MR API. I was
reading the 'Hadoop - The Definitive Guide' and came across a single pager
on new API. I wanted to try the new MR, but could not find much information
neither in the book nor on the internet.

Thanks,
Praveen

On Sat, Sep 24, 2011 at 8:20 PM, GOEKE, MATTHEW (AG/1000) <
[EMAIL PROTECTED]> wrote:

>  Praveen,****
>
> ** **
>
> Functionality wise you don’t gain much from using the new API and most
> would actually recommend that you stay with the old API as it will not be
> “officially” deprecated until 0.22 / 0.23 (I can’t remember which one). If
> you want to take a look at the classes dig into the packages for
> org.apache.hadoop.mapred.* (old) and org.apache.hadoop.mapreduce.* (new).
> Also, I thought that Definitive Guide second edition and Hadoop In Action
> covered the new api.****
>
> ** **
>
> Matt****
>
> ** **
>
> *From:* Praveen Sripati [mailto:[EMAIL PROTECTED]]
> *Sent:* Saturday, September 24, 2011 8:43 AM
> *To:* [EMAIL PROTECTED]
> *Subject:* How to pull data in the Map/Reduce functions?****
>
> ** **
>
> Hi,
>
> Normally the Hadoop framework calls the map()/reduce() for each record in
> the input split. I read in the 'Hadoop : The Definitive Guide' that that
> data can be pulled using the new MR API.
>
> What is the new API for pulling the data in the map()/reduce() or is there
> a sample code?
>
> Thanks,
> Praveen****
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