Github user gengliangwang commented on a diff in the pull request: https://github.com/apache/spark/pull/23088#discussion_r235027227 --- Diff: core/src/main/scala/org/apache/spark/status/AppStatusStore.scala --- @@ -238,8 +239,16 @@ private[spark] class AppStatusStore( val diff = idx - currentIdx --- End diff -- `diff` could be negative here?
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