-Re: parallism level
Thejas M Nair 2010-07-29, 17:18
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).
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
> this value? If I set the value to 10, does that mean all the MR jobs for this
> query will run with 10 reducers?