-Re: Null mapper?
David Rosenstrauch 2010-08-16, 22:21
On 08/16/2010 05:48 PM, Ted Yu wrote:
> On Mon, Aug 16, 2010 at 1:25 PM, David Rosenstrauch<[EMAIL PROTECTED]>wrote:
>> Is it possible for a M/R job to have no mapper? i.e.:
>> job.setMapperClass(null)? Or is it required that one at least use an
>> "identity mapper" (i.e., plain vanilla org.apache.hadoop.mapreduce.Mapper)?
Sorry, but I'm not clear. Which of the 2 questions were you answering
"no" to? :-)
I'm guessing the first.? i.e., I can't have a null mapper. So then I
need to supply a org.apache.hadoop.mapreduce.Mapper as a "no-op" mapper?
Can you please clarify?