Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/16867#discussion_r106229967
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
@@ -141,6 +143,9 @@ private[spark] class TaskSetManager(
// Task index, start and finish time for each task attempt (indexed by
task ID)
val taskInfos = new HashMap[Long, TaskInfo]
+ // Use a MedianHeap to record durations of successful tasks when
speculation is enabled.
--- End diff --
can you expand on this a bit to something like:
// Use a MedianHeap to record durations of successful tasks so we know when
to launch speculative tasks.
// This is only used when speculation is enabled, to avoid the overhead of
inserting into the heap when the
// heap won't be used.
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