Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/12666#discussion_r61005340
--- Diff: core/src/main/scala/org/apache/spark/scheduler/Pool.scala ---
@@ -55,6 +55,8 @@ private[spark] class Pool(
new FairSchedulingAlgorithm()
case SchedulingMode.FIFO =>
new FIFOSchedulingAlgorithm()
+ case _ =>
+ throw new RuntimeException(s"Unsupported spark.scheduler.mode:
$schedulingMode")
--- End diff --
Use something like `IllegalArgumentException`
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