Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/3779#discussion_r23338266
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
@@ -495,13 +495,39 @@ private[spark] class TaskSetManager(
* Get the level we can launch tasks according to delay scheduling,
based on current wait time.
*/
private def getAllowedLocalityLevel(curTime: Long):
TaskLocality.TaskLocality = {
- while (curTime - lastLaunchTime >= localityWaits(currentLocalityIndex)
&&
- currentLocalityIndex < myLocalityLevels.length - 1)
- {
- // Jump to the next locality level, and remove our waiting time for
the current one since
- // we don't want to count it again on the next one
- lastLaunchTime += localityWaits(currentLocalityIndex)
- currentLocalityIndex += 1
+ // remove the emptyList from pendingTasks lazily
+ def hasNonEmptyList(pendingTasks: HashMap[String, ArrayBuffer[Int]]):
Boolean = {
--- End diff --
If you have N executors, and they become empty one at a time, then this is
a N^2 operation right (because you iterate over all of them -- not just the
non-empty ones -- each time)?
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