mridulm commented on code in PR #38711:
URL: https://github.com/apache/spark/pull/38711#discussion_r1034252202
##########
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala:
##########
@@ -643,10 +643,11 @@ private[spark] class ExecutorAllocationManager(
// Should be 0 when no stages are active.
private val stageAttemptToNumRunningTask = new
mutable.HashMap[StageAttempt, Int]
private val stageAttemptToTaskIndices = new mutable.HashMap[StageAttempt,
mutable.HashSet[Int]]
- // Number of speculative tasks pending/running in each stageAttempt
- private val stageAttemptToNumSpeculativeTasks = new
mutable.HashMap[StageAttempt, Int]
- // The speculative tasks started in each stageAttempt
+ // Number of speculative tasks running in each stageAttempt
private val stageAttemptToSpeculativeTaskIndices =
+ new mutable.HashMap[StageAttempt, mutable.HashSet[Int]]()
Review Comment:
Note: Ideally, we simply need an `Int` for this - since we have split
`stageAttemptToUnsubmittedSpeculativeTasks`.
For now, let us keep it as a HashSet though - I have slight concerns around
dropped events which might make the map's go inconsistent.
##########
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala:
##########
@@ -722,9 +723,8 @@ private[spark] class ExecutorAllocationManager(
// because the attempt may still have running tasks,
// even after another attempt for the stage is submitted.
stageAttemptToNumTasks -= stageAttempt
- stageAttemptToNumSpeculativeTasks -= stageAttempt
+ stageAttemptToUnsubmittedSpeculativeTasks -= stageAttempt
Review Comment:
Remove from both maps.
##########
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala:
##########
@@ -896,9 +897,8 @@ private[spark] class ExecutorAllocationManager(
}
private def getPendingSpeculativeTaskSum(attempt: StageAttempt): Int = {
- val numTotalTasks = stageAttemptToNumSpeculativeTasks.getOrElse(attempt,
0)
- val numRunning =
stageAttemptToSpeculativeTaskIndices.get(attempt).map(_.size).getOrElse(0)
- numTotalTasks - numRunning
+ stageAttemptToUnsubmittedSpeculativeTasks
+ .getOrElse(attempt, mutable.HashSet.empty[Int]).size
Review Comment:
nit:
```suggestion
stageAttemptToUnsubmittedSpeculativeTasks.get(attempt).map(_.size).getOrElse(0)
```
##########
core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala:
##########
@@ -383,8 +383,8 @@ private[spark] class DAGScheduler(
/**
* Called by the TaskSetManager when it decides a speculative task is needed.
*/
- def speculativeTaskSubmitted(task: Task[_]): Unit = {
- eventProcessLoop.post(SpeculativeTaskSubmitted(task))
+ def speculativeTaskSubmitted(task: Task[_], taskIndex: Int = -1): Unit = {
+ eventProcessLoop.post(SpeculativeTaskSubmitted(task, taskIndex))
Review Comment:
Why not simply use `task.partitionId` instead for `taskIndex` ?
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