I'm new to Spark, but isn't this a pure scala question ?
The following seems to work with the spark shell:
$ spark-shell
scala> val rdd = sc.makeRDD(List(10,20,30))
rdd: org.apache.spark.rdd.RDD[Int] = ParallelCollectionRDD[8] at makeRDD at
<console>:12
scala> var cnt = -1
cnt: Int = -1
scala> val rdd2 = rdd.map(i => {cnt+=1; (cnt,i)} )
rdd2: org.apache.spark.rdd.RDD[(Int, Int)] = MappedRDD[9] at map at
<console>:16
scala> rdd2.collect
res8: Array[(Int, Int)] = Array((0,10), (1,20), (2,30))
Thierry
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