Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/5277#discussion_r27454877
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -95,10 +97,11 @@ class SparkContext(config: SparkConf) extends Logging
with ExecutorAllocationCli
val startTime = System.currentTimeMillis()
- @volatile private var stopped: Boolean = false
+ @volatile private var stopped: AtomicBoolean = new AtomicBoolean(false)
--- End diff --
You can remove `@volatile` and use `val` for AtomicBoolean
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