Ashutosh,
The counter will certainly be an parellization issue when multiple nodes are
used specially over massive datasets.
A better approach would be to use some thing along these lines:
val index = sc.parallelize(Range.Long(0, rdd.count, 1),
rdd.partitions.size)
val rddWithIndex = rdd.zip(index)
Which zips the two RDD's in a parallelizable fashion.
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