Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/8610#discussion_r51502059
--- Diff: core/src/main/scala/org/apache/spark/deploy/master/Master.scala
---
@@ -571,7 +571,8 @@ private[deploy] class Master(
usableWorkers: Array[WorkerInfo],
spreadOutApps: Boolean): Array[Int] = {
val coresPerExecutor = app.desc.coresPerExecutor
- val minCoresPerExecutor = coresPerExecutor.getOrElse(1)
+ val coresPerTask = app.desc.coresPerTask
+ val minCoresPerExecutor = math.max(coresPerExecutor.getOrElse(1),
coresPerTask)
--- End diff --
I don't think we should do this. If the user explicitly specified
`spark.executor.cores` they expect their executors to be scheduled with that
many cores, no more no less.
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