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 parallelism for this operation
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