Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16989#discussion_r115219343
--- Diff:
core/src/test/scala/org/apache/spark/scheduler/MapStatusSuite.scala ---
@@ -128,4 +130,22 @@ class MapStatusSuite extends SparkFunSuite {
assert(size1 === size2)
assert(!success)
}
+
+ test("Blocks which are bigger than 2 * average size should not be
underestimated.") {
+ val sizes = Array.concat(Array.fill[Long](1000)(1L), (1000L to
2000L).toArray)
+ val status1 = MapStatus(BlockManagerId("exec-0", "host-0", 100), sizes)
+ val arrayStream = new ByteArrayOutputStream(102400)
+ val objectOutputStream = new ObjectOutputStream(arrayStream)
+ assert(status1.isInstanceOf[HighlyCompressedMapStatus])
+ objectOutputStream.writeObject(status1)
+ objectOutputStream.flush()
+ val array = arrayStream.toByteArray
+ val objectInput = new ObjectInputStream(new
ByteArrayInputStream(array))
+ val status2 =
objectInput.readObject().asInstanceOf[HighlyCompressedMapStatus]
+ val avg = sizes.sum / 2001
+ ((2 * avg + 1) to 2000).foreach {
--- End diff --
add some comments to explain that the index of the `sizes` array is the
value of that element.
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