Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/2648#discussion_r18544040
--- Diff: core/src/main/scala/org/apache/spark/rdd/AsyncRDDActions.scala ---
@@ -78,16 +78,17 @@ class AsyncRDDActions[T: ClassTag](self: RDD[T])
extends Serializable with Loggi
// greater than totalParts because we actually cap it at
totalParts in runJob.
var numPartsToTry = 1
if (partsScanned > 0) {
- // If we didn't find any rows after the first iteration, just
try all partitions next.
+ // If we didn't find any rows after the previous iteration,
quadruple and retry.
// Otherwise, interpolate the number of partitions we need to
try, but overestimate it
- // by 50%.
+ // by 50%. We also cap the estimation in the end.
if (results.size == 0) {
- numPartsToTry = totalParts - 1
+ numPartsToTry = totalParts * 4
--- End diff --
totalParts should be partsScanned
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