Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3121#discussion_r20393642
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -1417,6 +1427,97 @@ class SparkContext(config: SparkConf) extends
SparkStatusAPI with Logging {
*/
object SparkContext extends Logging {
+ /**
+ * Lock that guards access to global variables that track SparkContext
construction.
+ */
+ private[spark] val SPARK_CONTEXT_CONSTRUCTOR_LOCK = new Object()
+
+ /**
+ * Records the creation site of the active, fully-constructed
SparkContext. If no SparkContext
+ * is active, then this is `None`.
+ *
+ * Access to this field is guarded by SPARK_CONTEXT_CONSTRUCTOR_LOCK
+ */
+ private[spark] var activeContextCreationSite: Option[CallSite] = None
+
+ /**
+ * Points to a partially-constructed SparkContext if some thread is in
the SparkContext
+ * constructor, or `None` if no SparkContext is being constructed.
+ *
+ * Access to this field is guarded by SPARK_CONTEXT_CONSTRUCTOR_LOCK
+ */
+ private[spark] var contextBeingConstructed: Option[SparkContext] = None
--- End diff --
I think these can all be strictly `private`
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