Interface | Description |
---|---|
ReduceOperation<S,R extends org.apache.hadoop.io.Writable> |
Reduce operations defining how to reduce single values
passed on workers, into partial values on workers, and then
into a single global reduced value.
|
Class | Description |
---|---|
Reducer<S,R extends org.apache.hadoop.io.Writable> |
Object responsible for performing reducing operation.
|
ReduceSameTypeOperation<R extends org.apache.hadoop.io.Writable> |
ReduceOperation object when single object being reduced is of
same type as reduced value.
|
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