Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3884#discussion_r23343271
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -1466,17 +1531,29 @@ class SparkContext(config: SparkConf) extends
Logging with ExecutorAllocationCli
}
}
- def getCheckpointDir = checkpointDir
+ def getCheckpointDir = {
+ assertNotStopped()
+ checkpointDir
+ }
/** Default level of parallelism to use when not given by user (e.g.
parallelize and makeRDD). */
- def defaultParallelism: Int = taskScheduler.defaultParallelism
+ def defaultParallelism: Int = {
--- End diff --
This throws an exception because `taskScheduler` is null:
```
scala> sc.defaultParallelism
java.lang.NullPointerException
at
org.apache.spark.SparkContext.defaultParallelism(SparkContext.scala:1461)
at $iwC$$iwC$$iwC$$iwC.<init>(<console>:13)
at $iwC$$iwC$$iwC.<init>(<console>:18)
at $iwC$$iwC.<init>(<console>:20)
at $iwC.<init>(<console>:22)
at <init>(<console>:24)
at .<init>(<console>:28)
at .<clinit>(<console>)
at .<init>(<console>:7)
at .<clinit>(<console>)
at $print(<console>)
```
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