Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/6070#discussion_r30104334
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala ---
@@ -662,6 +664,16 @@ object StreamingContext extends Logging {
}
}
+ /**
+ * Get the context that is currently active, that is, started but not
stopped.
+ */
+ @Experimental
+ def getActive(): Option[StreamingContext] = {
+ ACTIVATION_LOCK.synchronized {
+ Option(activeContext.get())
--- End diff --
I'm a bit confused about the locking here. What if I call start() then
stop() currently on the same streamingContext in different threads. Can't I
have a race condition where the stop() calls `setActiveContext(null)` between
the following lines:
```
t1: state = StreamingContextState.ACTIVE
t2: --> setActiveContext(null)
t1: setActiveContext(this)
```
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