Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/727#discussion_r12511646
--- Diff: core/src/test/scala/org/apache/spark/rdd/RDDSuite.scala ---
@@ -202,6 +202,39 @@ class RDDSuite extends FunSuite with
SharedSparkContext {
assert(repartitioned2.collect().toSet === (1 to 1000).toSet)
}
+ test("repartitioned RDDs perform load balancing") {
+ // Coalesce partitions
+ val input = Array.fill(1000)(1)
+ val initialPartitions = 10
+ val data = sc.parallelize(input, initialPartitions)
+
+ val repartitioned1 = data.repartition(2)
+ assert(repartitioned1.partitions.size == 2)
+ val partitions1 = repartitioned1.glom().collect()
+ // some noise in balancing is allowed due to randomization
+ assert(math.abs(partitions1(0).length - 500) < initialPartitions)
+ assert(math.abs(partitions1(1).length - 500) < initialPartitions)
+ assert(repartitioned1.collect() === input)
+
+ def testSplitPartitions(input: Seq[Int], initialPartitions: Int,
finalPartitions: Int) {
+ val data = sc.parallelize(input, initialPartitions)
+ val repartitioned = data.repartition(finalPartitions)
+ assert(repartitioned.partitions.size == finalPartitions)
--- End diff --
Maybe you use `===` here for nicer message
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