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https://issues.apache.org/jira/browse/SPARK-14889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15256059#comment-15256059
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Sean Owen commented on SPARK-14889:
-----------------------------------
Yes I think Pool and TaskSchedulerImpl have blocks that should throw a better
exception when not matchin FAIR or FIFO.
> scala.MatchError: NONE (of class scala.Enumeration$Val) when
> spark.scheduler.mode=NONE
> --------------------------------------------------------------------------------------
>
> Key: SPARK-14889
> URL: https://issues.apache.org/jira/browse/SPARK-14889
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.0.0
> Reporter: Jacek Laskowski
> Priority: Minor
>
> When {{TaskSchedulerImpl}} is initialized it pattern matches on acceptable
> scheduling modes - {{FIFO}} and {{FAIR}} modes - but misses {{NONE}}.
> It should at least pattern match the case and throw a more meaningful
> exception.
> {code}
> ➜ spark git:(master) ✗ ./bin/spark-shell -c spark.scheduler.mode=NONE
> 16/04/25 09:15:00 ERROR SparkContext: Error initializing SparkContext.
> scala.MatchError: NONE (of class scala.Enumeration$Val)
> at org.apache.spark.scheduler.Pool.<init>(Pool.scala:53)
> at
> org.apache.spark.scheduler.TaskSchedulerImpl.initialize(TaskSchedulerImpl.scala:131)
> at
> org.apache.spark.SparkContext$.org$apache$spark$SparkContext$$createTaskScheduler(SparkContext.scala:2352)
> at org.apache.spark.SparkContext.<init>(SparkContext.scala:492)
> {code}
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