Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/8080#discussion_r36707649
--- Diff: python/pyspark/streaming/context.py ---
@@ -170,6 +173,48 @@ def getOrCreate(cls, checkpointPath, setupFunc):
cls._transformerSerializer.ctx = sc
return StreamingContext(sc, None, jssc)
+ @classmethod
+ def getActive(cls):
+ """
+ Return either the currently active StreamingContext (i.e., if
there is a context started
+ but not stopped) or None.
+ """
+ activePythonContext = cls._activeContext
+ if activePythonContext is not None:
+ # Verify that the current running Java StreamingContext is
active and is the same one
+ # backing the supposedly active Python context
+ activePythonContextJavaId =
activePythonContext._jssc.ssc().hashCode()
+ activeJvmContextOption =
activePythonContext._jvm.StreamingContext.getActive()
+ if activeJvmContextOption.isEmpty() or \
+ activeJvmContextOption.get().hashCode() !=
activePythonContextJavaId:
--- End diff --
I think it's better to throw an exception when
`activeJvmContextOption.get().hashCode() != activePythonContextJavaId` because
it will be confusing that `getActive` returns None but `getActiveOrCreate`
still complains there is already an active context in Scala codes.
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