Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/407#discussion_r11617633
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/recommendation/ALS.scala ---
@@ -167,11 +169,24 @@ class ALS private (
this.numBlocks
}
- val partitioner = new HashPartitioner(numBlocks)
+ // Hash an integer to propagate random bits at all positions, similar
to java.util.HashTable
+ def hash(x: Int): Int = {
--- End diff --
Instead of implementing a hash function, shall we use some existing ones?
For example, we may use `scala.util.hashing.byteswap32`.
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