Hi all,
by default the parallism (number of reducers) of a pig query is 1. How to change
this value? If I set the value to 10, does that mean all the MR jobs for this
query will run with 10 reducers?
Thanks,
-Gang

Please see http://hadoop.apache.org/pig/docs/r0.7.0/piglatin_ref2.html .

You can use Oset default_parallel 10¹ to ask query to use 10 reducers for
all MR jobs, or specify Oparallel x¹ in the pig statement to ask pig to use
x number of reducers for that operation (for operations like group, order-by
, join that usually result in a separate MR job).
-Thejas

On 7/28/10 7:00 PM, "Gang Luo" <[EMAIL PROTECTED]> wrote:

> Hi all,
> by default the parallism (number of reducers) of a pig query is 1. How to
> change
> this value? If I set the value to 10, does that mean all the MR jobs for this
> query will run with 10 reducers?
>
>
> Thanks,
> -Gang
>
>
>      
>