Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/6652#discussion_r31975738
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -137,6 +137,23 @@ class DAGScheduler(
private[scheduler] val eventProcessLoop = new
DAGSchedulerEventProcessLoop(this)
taskScheduler.setDAGScheduler(this)
+ // Flag to control if reduce tasks are assigned preferred locations
+ private val shuffleLocalityEnabled =
+ sc.getConf.getBoolean("spark.shuffle.reduceLocality.enabled", true)
+ // Number of map, reduce tasks above which we do not assign preferred
locations
+ // based on map output sizes. We limit the size of jobs for which assign
preferred locations
+ // as sorting the locations by size becomes expensive.
--- End diff --
Fixed now
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