Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/6006#discussion_r30830692
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala ---
@@ -1270,9 +1271,59 @@ class SQLContext(@transient val sparkContext:
SparkContext)
////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////
- // End of eeprecated methods
+ // End of deprecated methods
////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////
+
+
+ // 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)
}
+/**
+ * This SQLContext object contains utility functions to create a singleton
SQLContext instance,
+ * or to get the last created SQLContext instance.
+ */
+object SQLContext {
+
+ private val INSTANTIATION_LOCK = new Object()
+
+ /**
+ * Reference to the last created SQLContext.
+ */
+ @transient private val lastInstantiatedContext = new
AtomicReference[SQLContext]()
+ /**
+ * Get the singleton SQLContext if it exists or create a new one using
the given configuration.
+ * This function can be used to create a singleton SQLContext object
that can be shared across
+ * the JVM.
+ */
+ def getOrCreate(sparkContext: SparkContext): SQLContext = {
+ INSTANTIATION_LOCK.synchronized {
+ if (lastInstantiatedContext.get() == null) {
+ new SQLContext(sparkContext)
+ }
+ }
+ lastInstantiatedContext.get()
+ }
+
+ private[sql] def getLastInstantiatedContext(): Option[SQLContext] = {
--- End diff --
Aah, was using it for tests but changed tests in the middle.
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