Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/8909#discussion_r41420988
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala ---
@@ -1208,36 +1204,72 @@ object SQLContext {
private val INSTANTIATION_LOCK = new Object()
/**
- * Reference to the last created SQLContext.
+ * The active SQLContext for threads.
+ */
+ private val activeContexts: InheritableThreadLocal[SQLContext] =
+ new InheritableThreadLocal[SQLContext]
+
+ /**
+ * Reference to the created SQLContext.
*/
- @transient private val lastInstantiatedContext = new
AtomicReference[SQLContext]()
+ @transient private val instantiatedContext = new
AtomicReference[SQLContext]()
--- End diff --
I think this makes more sense than "last" but we should update the objects
doc if we are going to change the semantics.
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