Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/2648#discussion_r18539447
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -1084,10 +1084,10 @@ abstract class RDD[T: ClassTag](
if (buf.size == 0) {
numPartsToTry = partsScanned * 4
} else {
- numPartsToTry = (1.5 * num * partsScanned / buf.size).toInt
+ // the left side of max is >=1 whenever partsScanned >= 2
+ numPartsToTry = ((1.5 * num * partsScanned / buf.size).toInt -
partsScanned) max 1
--- End diff --
Having a upper bound will be better for safety or stability, otherwise we
will need to fix it some day, just like we had do for the cases that buf.size
== 0.
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