Created
April 2, 2015 21:51
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Scala Scratch Pad
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| case class MeanM(sum: Double, count: Long) { | |
| def +(that: MeanM): MeanM = { | |
| new MeanM(this.sum + that.sum, this.count + that.count) | |
| } | |
| def mean = sum / count.toDouble | |
| } | |
| val data = List(("cust1", 1.0),("cust1", 5.0),("cust2", 6.0)) | |
| val dataRDD = sc.makeRDD(data) | |
| dataRDD.aggregateByKey(MeanM(0,0))(_ + MeanM(_,1), _ + _).mapValues(_.mean) |
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