Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/1269#issuecomment-68401156
@akopich The right way to do pseudo-randomness is to do:
```
val randomSeed = ... // if you want to pass in a seed
indx.mapPartitionsWithIndex { case (partitionIndex, iterator) =>
// Use the partition index to make a different but deterministic seed for
each partition.
val random = new java.util.Random(partitionIndex + randomSeed)
iterator.map(random.nextInt)
}
```
You can find examples in, e.g., mllib/tree/impl/BaggedPoint.scala
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