Apply to Stream[Tuple2[K,V]] Group by the key of a KV tuple For (key, value) will groupby key
Apply to Stream[Tuple2[K,V]] Group by the key of a KV tuple For (key, value) will groupby key
the new KV stream
Sum the value of the tuples
Sum the value of the tuples
Apply to Stream[Tuple2[K,V]], V must be of type Number
For input (key, value1), (key, value2), will generate (key, value1 + value2)
the numeric operations
the sum stream