Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11865#discussion_r60129541
--- Diff: core/src/main/scala/org/apache/spark/rdd/CoalescedRDD.scala ---
@@ -70,21 +70,24 @@ private[spark] case class CoalescedRDDPartition(
* parent partitions
* @param prev RDD to be coalesced
* @param maxPartitions number of desired partitions in the coalesced RDD
(must be positive)
- * @param balanceSlack used to trade-off balance and locality. 1.0 is all
locality, 0 is all balance
+ * @param partitionCoalescer [[PartitionCoalescer]] implementation to use
for coalescing
*/
private[spark] class CoalescedRDD[T: ClassTag](
@transient var prev: RDD[T],
maxPartitions: Int,
- balanceSlack: Double = 0.10)
+ partitionCoalescer: Option[PartitionCoalescer] = None)
extends RDD[T](prev.context, Nil) { // Nil since we implement
getDependencies
require(maxPartitions > 0 || maxPartitions == prev.partitions.length,
s"Number of partitions ($maxPartitions) must be positive.")
+ // used to trade-off balance and locality. 1.0 is all locality, 0 is all
balance
+ val balanceSlack: Double = 0.10
--- End diff --
we don't need a val here do we?
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