Oleg, Are you wanting to have them in different reducers? If so then you can write a Comparable object to make that happen.
If you want them to be on the same reducer, then that is what hadoop will do. :) On 2010-06-09, at 3:06 PM, Ted Yu wrote: > Can you disclose more about how K3 is generated. > From your description below, it is possible. > > On Wed, Jun 9, 2010 at 1:17 AM, Oleg Ruchovets <[email protected]> wrote: > >> Hi , >> My hadoop job writes results of map/reduce to HBase. >> I have 3 reducers. >> >> Here is a sequence of input and output parameters for Mapper , Combiner and >> Reducer >> *input: InputFormat<K1,V1> >> mapper: Mapper<K1,V1,K2,V2> >> combiner: Reducer<K2,V2,K2,V2> >> reducer: Reducer<K2,V2,K3,V3> >> output: RecordWriter<K3,V3> >> >> *My question: >> Is it possible that more than one reducer has the same output key K3. >> Meaning in case I have 3 reducers is it possible that >> reducer1 K3 -* 1* , V3 [1,2,3] >> reducer2 K3 - 2 , V3 [5,6,9] >> reducer3 K3 - *1* , V3 [10,15,22] >> >> As you can see reducer1 has K3 - 1 and reducer3 has K3 - 1. >> So is that case possible or every and every reducer has unique output key? >> >> Thanks in advance >> Oleg. >>
