scala - Subtract an RDD from another RDD doesn't work correctly -


i want subtract rdd rdd. looked documentation , found subtract can that. actually, when tested subtract, final rdd remains same , values not removed!

is there other function that? or using subtract incorrectly?

here code used:

 val vertexrdd: org.apache.spark.rdd.rdd[(vertexid, array[int])]  val clusters  = vertexrdd.takesample(false, 3)  val clustersrdd: rdd[(vertexid, array[int])] = sc.parallelize(clusters)  val final = vertexrdd.subtract(clustersrdd)  final.collect().foreach(println(_))

performing set operations subtract mutable types (array in example) unsupported, or @ least not recommended.

try using immutable type instead.

i believe wrappedarray relevant container storing arrays in sets, i'm not sure.


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