squito 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_r303600045
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File path: core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala
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@@ -302,16 +274,22 @@ 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))) {
Review comment:
nit: double indent the continuation of the condition
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