Github user wgtmac commented on a diff in the pull request: https://github.com/apache/spark/pull/15248#discussion_r80791402 --- Diff: core/src/main/scala/org/apache/spark/status/api/v1/ApiRootResource.scala --- @@ -222,6 +222,7 @@ private[spark] object ApiRootResource { private[spark] trait UIRoot { def getSparkUI(appKey: String): Option[SparkUI] def getApplicationInfoList: Iterator[ApplicationInfo] + def getApplicationInfoList(limit: Int): Iterator[ApplicationInfo] --- End diff -- The default value doesn't help because 1) The parameter **limit** that you have added in /applications endpoint is an **Integer**. So it can be null. When it is null, the default value won't help. Still need to differentiate null with not null. 2) When limit is a negative number, take(-1) is same as take(0) which returns an empty list. So I still need to judge whether it is less than or equals to 0.
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