Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/7250#discussion_r34215156
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala ---
@@ -688,6 +690,8 @@ class StreamingContext private[streaming] (
} finally {
// The state should always be Stopped after calling `stop()`, even
if we haven't started yet
state = STOPPED
+ // De-registering Streaming Metrics of the StreamingContext
+ env.metricsSystem.removeSource(streamingSource)
--- End diff --
I think it would be better to add try as TD said, otherwise you may meet
exception when SparkContext is stopped.
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