foreachRDD returning N RDDs when?

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foreachRDD returning N RDDs when?



There has been some discussion on foreachRDD in Spark Streaming as per a good posting stackoverflow 36421619. None-the-less I feel the answers are not clear enough when reading the prose. So here goes ...



My questions are:



The commonest use case appears to be for persisting to external storage I note. That seems to be the guide for most, output operations. I am somehow missing something.




1 Answer
1



Only with windowed operation, else 1 microbatch = 1 RDD.





Documentation a little confusing.
– thebluephantom
Dec 2 '17 at 10:18






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