yaooqinn commented on a change in pull request #32539:
URL: https://github.com/apache/spark/pull/32539#discussion_r632667082
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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:
> In some cases, I don't want it to go that high, maybe just a few
threads to meet the basic need of a jetty server.
For example, for a machine that used to launch Spark applications, we can
limit this size to reduce to risk of getting `java.lang.OutOfMemoryError:
Unable to create new native thread `
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