thejdeep commented on pull request #34607:
URL: https://github.com/apache/spark/pull/34607#issuecomment-976532846
> > I changed maybeUpdate to update when we encounter a speculative task.
The problem with the previous approach was that - if we have a speculative
task, then future task end events would all make unnecessary speculation
summary writes to DB. What do you think ?
>
> How about changing `speculationStageSummary` in `LiveStage` to `var
speculationStageSummary: Option[LiveSpeculationStageSummary]` and then, we can
check whether there is any update about speculation summary. If it's `Some`, we
can update with `maybeUpdate`.
@sarutak Would not really prefer it since it would require changing a class
val to a var. I am assuming this is the change you suggested :
```
AppStatusListener.scala
if (event.taskInfo.speculative) {
stage.speculationStageSummary =
Some(stage.speculationStageSummary.getOrElse(
new LiveSpeculationStageSummary(event.stageId,
event.stageAttemptId)))
val speculationStageSummary = stage.speculationStageSummary.get
speculationStageSummary.numActiveTasks -= 1
speculationStageSummary.numCompletedTasks += completedDelta
speculationStageSummary.numFailedTasks += failedDelta
speculationStageSummary.numKilledTasks += killedDelta
}
if(stage.speculationStageSummary.isDefined) {
maybeUpdate(stage.speculationStageSummary.get, now)
}
```
and
```
LiveEntity.scala
var speculationStageSummary: Option[LiveSpeculationStageSummary] = None
```
What do you think ?
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