an example for join operation

[charles du <ta...@gmail.com>]

Hi all:

Is there a good example for using map/reduce to implement a join operation?
For example, I have two hadoop files: file A has records like <k1, v1>, and
file B has records like <k2, v2>. I would like to join A and B if k1 is
equal to k2. Thanks.


-- 
tp

Re: an example for join operation

[Naama Kraus <na...@gmail.com>]

Hi,

I think the following may help -

The Hadoop package org.apache.hadoop.mapred.join

Also, Pig Latin, which is a language for processing data on top of Hadoop
MapReduce - http://wiki.apache.org/pig

Naama

On Tue, Jul 29, 2008 at 9:26 AM, charles du <ta...@gmail.com> wrote:

> Hi all:
>
> Is there a good example for using map/reduce to implement a join operation?
> For example, I have two hadoop files: file A has records like <k1, v1>, and
> file B has records like <k2, v2>. I would like to join A and B if k1 is
> equal to k2. Thanks.
>
>
> --
> tp
>



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