-Re: Cartesian product in hadoop
Jagat Singh 2013-04-18, 09:58
Can you have a look at
On Thu, Apr 18, 2013 at 7:47 PM, zheyi rong <[EMAIL PROTECTED]> wrote:
> Dear all,
> I am writing to kindly ask for ideas of doing cartesian product in hadoop.
> Specifically, now I have two datasets, each of which contains 20million
> I want to do cartesian product on these two datasets, comparing lines
> The output of each comparison can be mostly filtered by a function ( we do
> not output the
> whole result of this cartesian product, but only a small part).
> I guess one good way is to pass one block from dataset1 and another block
> from dataset2
> to a mapper, then let the mappers do the product in memory to avoid IO.
> Any suggestions?
> Thank you very much.
> Zheyi Rong