Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/1056#discussion_r15681898
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -991,6 +994,9 @@ class SparkContext(config: SparkConf) extends Logging {
dagScheduler = null
if (dagSchedulerCopy != null) {
metadataCleaner.cancel()
+ if (heartbeatReceiver != null) {
--- End diff --
I don't see an execution code path where this could possibly be null. Is
there one?
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