pgandhi999 commented on a change in pull request #23677:
[SPARK-26755][SCHEDULER] : Optimize Spark Scheduler to dequeue speculative
tasks…
URL: https://github.com/apache/spark/pull/23677#discussion_r305970786
##########
File path: core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala
##########
@@ -302,16 +260,23 @@ private[spark] class TaskSetManager(
private def dequeueTaskFromList(
execId: String,
host: String,
- list: ArrayBuffer[Int]): Option[Int] = {
+ list: ArrayBuffer[Int],
+ speculative: Boolean = false): Option[Int] = {
var indexOffset = list.size
while (indexOffset > 0) {
indexOffset -= 1
val index = list(indexOffset)
- if (!isTaskBlacklistedOnExecOrNode(index, execId, host)) {
+ if (!isTaskBlacklistedOnExecOrNode(index, execId, host) &&
+ !(speculative && hasAttemptOnHost(index, host))) {
// This should almost always be list.trimEnd(1) to remove tail
list.remove(indexOffset)
- if (copiesRunning(index) == 0 && !successful(index)) {
- return Some(index)
+ if (!successful(index)) {
+ if (copiesRunning(index) == 0) {
+ return Some(index)
+ } else if (speculative && copiesRunning(index) == 1) {
Review comment:
Added comment, thank you.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
With regards,
Apache Git Services
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
