Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/929#discussion_r15566629
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/recommendation/ALS.scala ---
@@ -255,6 +255,9 @@ class ALS private (
rank, lambda, alpha, YtY)
previousProducts.unpersist()
logInfo("Re-computing U given I (Iteration %d/%d)".format(iter,
iterations))
+ if (sc.checkpointDir.isDefined && (iter % 3 == 1)) {
--- End diff --
Do we need to checkpoint the first RDD? If `iter` starts at `1`, we can use
`iter % 3 == 0` and hence the checkpoint RDDs are `product-3`, `product-6`,
`product-9`, etc.
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