At 2014-12-02 22:01:20 -0800, Deep Pradhan <pradhandeep1...@gmail.com> wrote:
> I have a graph which returns the following on doing graph.vertices
> (1, 1.0)
> (2, 1.0)
> (3, 2.0)
> (4, 2.0)
> (5, 0.0)
>
> I want to group all the vertices with the same attribute together, like into
> one RDD or something. I want all the vertices with same attribute to be
> together.
You can do this by flipping the tuples so the values become the keys, then
using one of the by-key functions in PairRDDFunctions:
val a: RDD[(Int, Double)] = sc.parallelize(List(
(1, 1.0),
(2, 1.0),
(3, 2.0),
(4, 2.0),
(5, 0.0)))
val b: RDD[(Double, Int)] = a.map(kv => (kv._2, kv._1))
val c: RDD[(Double, Iterable[Int])] = b.groupByKey(numPartitions = 5)
c.collect.foreach(println)
// (0.0,CompactBuffer(5))
// (1.0,CompactBuffer(1, 2))
// (2.0,CompactBuffer(3, 4))
Ankur
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