Hi,
I use the following code for calculating average. The problem is that the
reduce operation return a DStream here and not a tuple as it normally does
without Streaming. So how can we get the sum and the count from the DStream.
Can we cast it to tuple?
val numbers =
You mean you normally get an RDD, right?
A DStream is a sequence of RDDs.
It kind of depends on what you are trying to accomplish here?
sum/count for each RDD in the stream?
On Wed, May 7, 2014 at 6:43 PM, Laeeq Ahmed laeeqsp...@yahoo.com wrote:
Hi,
I use the following code for calculating
Hi,
I use the following code for calculating average. The problem is that the
reduce operation return a DStream here and not a tuple as it normally does
without Streaming. So how can we get the sum and the count from the DStream.
Can we cast it to tuple?
val numbers =
Use DStream.foreachRDD to do an operation on the final RDD of every batch.
val sumandcount = numbers.map(n = (n.toDouble, 1)).reduce{ (a, b) = (a._1
+ b._1, a._2 + b._2) }
sumandcount.foreachRDD { rdd = val first: (Double, Int) = rdd.take(1) ;
... }
DStream.reduce creates DStream whose RDDs
