Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/1313#discussion_r15829983
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
@@ -293,7 +291,7 @@ private[spark] class TaskSetManager(
for (index <- speculatableTasks if canRunOnHost(index)) {
val prefs = tasks(index).preferredLocations
val executors = prefs.flatMap(_.executorId)
- if (prefs.size == 0 || executors.contains(execId)) {
+ if (executors.contains(execId)) {
--- End diff --
In the comment above this, remove "preference-less tasks" since we've moved
them below
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