Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/8909#discussion_r41462815
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala ---
@@ -1196,49 +1174,101 @@ class SQLContext(@transient val sparkContext:
SparkContext)
// Register a succesfully instantiatd context to the singleton. This
should be at the end of
// the class definition so that the singleton is updated only if there
is no exception in the
// construction of the instance.
- SQLContext.setLastInstantiatedContext(self)
+ sparkContext.addSparkListener(new SparkListener{
+ override def onApplicationEnd(applicationEnd:
SparkListenerApplicationEnd) {
+ SQLContext.clearTheInstantiatedContext(self)
+ }
+ })
+
+ SQLContext.setInstantiatedContext(self)
}
/**
* This SQLContext object contains utility functions to create a singleton
SQLContext instance,
- * or to get the last created SQLContext instance.
+ * or to get the created SQLContext instance.
*/
object SQLContext {
private val INSTANTIATION_LOCK = new Object()
/**
- * Reference to the last created SQLContext.
+ * The active SQLContext for the current thread.
*/
- @transient private val lastInstantiatedContext = new
AtomicReference[SQLContext]()
+ private val activeContext: InheritableThreadLocal[SQLContext] =
+ new InheritableThreadLocal[SQLContext]
+
+ /**
+ * Reference to the created SQLContext.
+ */
+ @transient private val instantiatedContext = new
AtomicReference[SQLContext]()
--- End diff --
if we absolutely have to keep both, then we should expand on the comments
to explain why a thread local context is needed in addition to one that was
initially instantiated.
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