Re: Create a single output per each mapper

[Prashant Kommireddi]

Take a look at cleanup() method on Mapper.

Thanks,
Prashant

Sent from my iPhone

On Dec 12, 2011, at 8:46 PM, Shi Yu <sh...@uchicago.edu> wrote:

> Hi,
>
> Suppose I have two mappers, each mapper is assigned 10 lines of
> data. I want to set a counter for each mapper, counting and
> accumulating, then output the counter value to the reducer when
> the mapper finishes processing all the assigned lines.  So I
> want the mapper outputs values only when there is no further
> incoming data (when that mapper closes). Is this doable? How?
> thanks!
>
> Shi