yaooqinn commented on a change in pull request #32539:
URL: https://github.com/apache/spark/pull/32539#discussion_r632247969
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File path: core/src/main/scala/org/apache/spark/internal/config/UI.scala
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@@ -218,4 +218,13 @@ private[spark] object UI {
.stringConf
.transform(_.toUpperCase(Locale.ROOT))
.createWithDefault("LOCAL")
+
+ val UI_THREADS = ConfigBuilder("spark.ui.threads")
Review comment:
When bottleneck hits and it's not caused by lack of threads.
And similarly, we have limited the size of acceptors
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/ui/JettyUtils.scala#L298-L300
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