Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/8791#discussion_r39726654
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala ---
@@ -198,7 +198,7 @@ class StreamingContext private[streaming] (
private var state: StreamingContextState = INITIALIZED
- private val startSite = new AtomicReference[CallSite](null)
+ private[streaming] val startSite = new AtomicReference[CallSite](null)
--- End diff --
Looks it's better to add a new method like
```
private[streaming] def getStartSite: String = startSite.get()
```
rather than exposing `AtomicReference`. In addition, this one won't break
MiMa tests.
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