Grokbase Groups Pig user July 2010
FAQ
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" 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


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