Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/7250#discussion_r34231933
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala ---
@@ -674,6 +676,8 @@ class StreamingContext private[streaming] (
logWarning("StreamingContext has already been stopped")
case ACTIVE =>
scheduler.stop(stopGracefully)
+ // De-registering Streaming Metrics of the StreamingContext
+ env.metricsSystem.removeSource(streamingSource)
--- End diff --
@jerryshao In this PR the streaming metric source is added only after
starting the context. So it is fine to deregister only when the state is
ACTIVE. Also that maintain the characteristic that `stop` is idempotent.
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