srowen commented on a change in pull request #23986: [SPARK-27070] Fix
performance bug in DefaultPartitionCoalescer
URL: https://github.com/apache/spark/pull/23986#discussion_r262932060
##########
File path: core/src/main/scala/org/apache/spark/rdd/CoalescedRDD.scala
##########
@@ -156,9 +156,11 @@ private[spark] class CoalescedRDD[T: ClassTag](
private class DefaultPartitionCoalescer(val balanceSlack: Double = 0.10)
extends PartitionCoalescer {
- def compare(o1: PartitionGroup, o2: PartitionGroup): Boolean =
o1.numPartitions < o2.numPartitions
- def compare(o1: Option[PartitionGroup], o2: Option[PartitionGroup]): Boolean
=
- if (o1 == None) false else if (o2 == None) true else compare(o1.get,
o2.get)
+
+ implicit val partitionGroupOrdering: Ordering[PartitionGroup]
+ = (o1: PartitionGroup, o2: PartitionGroup)
+ => o1.numPartitions - o2.numPartitions
Review comment:
The indent is off here. Returning the result of a subtraction in compare can
overflow, though I don't think it can happen in practice here. Still, see
below, I think we can just remove this.
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