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[SPARK-12466] Fix harmless NPE in tests #10417

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andrewor14 wants to merge 1 commit into from
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[SPARK-12466] Fix harmless NPE in tests #10417

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6 changes: 5 additions & 1 deletion core/src/main/scala/org/apache/spark/deploy/master/Master.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -979,7 +979,11 @@ private[deploy] class Master(

futureUI.onSuccess { case Some(ui) =>
appIdToUI.put(app.id, ui)
self.send(AttachCompletedRebuildUI(app.id))
// `self` can be null if we are already in the process of shutting down
// This happens frequently in tests where `local-cluster` is used
if (self != null) {
self.send(AttachCompletedRebuildUI(app.id))
}
// Application UI is successfully rebuilt, so link the Master UI to it
// NOTE - app.appUIUrlAtHistoryServer is volatile
app.appUIUrlAtHistoryServer = Some(ui.basePath)
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