Re: Reduce side question on MR

[Rahul Bhattacharjee <ra...@gmail.com>]

Thanks Harsh for the response. It very much answers what I was looking for.

Regards,
Rahul


On Wed, May 29, 2013 at 8:10 PM, Rahul Bhattacharjee <
rahul.rec.dgp@gmail.com> wrote:

> Hi,
>
> I have one question related to the reduce phase of MR jobs.
>
> The intermediate outputs of map tasks are pulled in from the nodes which
> ran map tasks to the node where reducers is going to run and those
> intermediate data is written to the reducers local fs. My question is that
> if there is a job processing huge amount of data and it has multiple
> mappers but only one reducer , then its possible that the job would never
> complete successfully as the single hosts disk might not be sufficient to
> hold all the map outputs of the job.
>
> The job essentially would fail after retrying configured number of
> attempts.
>
> Thanks,
> Rahul
>