Github user ilganeli commented on a diff in the pull request:
https://github.com/apache/spark/pull/5501#discussion_r28356144
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -1855,6 +1857,28 @@ object SparkContext extends Logging {
}
/**
+ * Because we can only have one active Spark Context per JVM and there
are times when multiple
+ * applications may wish to share a SparkContext, this function may be
used to get or instantiate
+ * a SparkContext and register it as a singleton object.
+ *
+ * Note: This function cannot be used to create multiple spark contexts
even if multiple contexts
+ * are allowed. Multiple contexts will still need to be created with
explicit calls to the
+ * SparkContext constructor.
+ */
+ def getOrCreate(config: SparkConf): SparkContext = {
+ if (activeContext.get() != null) {
+ setActiveContext(new SparkContext(config),
--- End diff --
Good point - I was looking to use the setActiveContext lock but as you
rightly point out, this will trigger an exception if both attempt to create.
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