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[SPARK-31921][CORE] Fix the wrong warning: "App app-xxx requires more resource than any of Workers could have" #28742

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[SPARK-31921][CORE] Fix the wrong warning: "App app-xxx requires more resource than any of Workers could have" #28742

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4 changes: 3 additions & 1 deletion core/src/main/scala/org/apache/spark/deploy/master/Master.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -715,7 +715,9 @@ private[deploy] class Master(
val usableWorkers = workers.toArray.filter(_.state == WorkerState.ALIVE)
.filter(canLaunchExecutor(_, app.desc))
.sortBy(_.coresFree).reverse
if (waitingApps.length == 1 && usableWorkers.isEmpty) {
val appMayHang = waitingApps.length == 1 &&

@jiangxb1987 jiangxb1987 Jun 8, 2020

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Why do you need to verify waitingApps.length == 1 ?

@Ngone51 Ngone51 Jun 8, 2020

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hmm..I was also thinking about this question when I was fixing. I think we can extend it to multiple apps. Let me try it.

@jiangxb1987 jiangxb1987 Jun 8, 2020

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I'm not sure how useful is this warning message, this just reflects the current status within one round of scheduling, we can tolerant the behavior to not launch a new executor on currently available workers.

@Ngone51 Ngone51 Jun 8, 2020

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It's from #25047 (comment) originally. The warning is mainly used to detect the possible hang of an application.

@jiangxb1987 jiangxb1987 Jun 8, 2020

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I don't like this check, but that seems to be the most simple solution for now. Let's keep it then.

@tgravescs tgravescs Jun 8, 2020

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I think the idea of ==1 is that there is only 1 active application, if more then 1, other applications could be using resources so unless you did a lot more checking. We could definitely make it a more comprehensive check in the future. I believe this was supposed to be a simple sanity check for people playing around that may have started the cluster with not enough resources. The standalone mode does not tell you there aren't enough and will just hang forever.

waitingApps.head.executors.isEmpty && usableWorkers.isEmpty
if (appMayHang) {
logWarning(s"App ${app.id} requires more resource than any of Workers could have.")
}
val assignedCores = scheduleExecutorsOnWorkers(app, usableWorkers, spreadOutApps)
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