Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16601#discussion_r96550717
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/DStreamGraph.scala ---
@@ -31,12 +31,15 @@ final private[streaming] class DStreamGraph extends
Serializable with Logging {
private val inputStreams = new ArrayBuffer[InputDStream[_]]()
private val outputStreams = new ArrayBuffer[DStream[_]]()
+ val inputStreamNameAndID = new ArrayBuffer[(String, Int)]()
--- End diff --
nit: change it to `@volatile private var inputStreamNameAndID: Seq[(String,
Int)] = Nil` and just set it in `start`. Don't expose a mutable ArrayBuffer to
the caller.
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