doc

Author: squito

core/src/main/scala/org/apache/spark/status/api/v1/JsonRootResource.scala

@@ -98,6 +98,11 @@ private[spark] object JsonRootResource {
 }
 
 
+/**
+ * This trait is shared by the all the root containers for application UI information --
+ * the HistoryServer, the Master UI, and the application UI.  This provides the common
+ * interface needed for them all to expose application info as json.
+ */
 private[spark] trait UIRoot {
   def getSparkUI(appKey: String): Option[SparkUI]
   def getApplicationInfoList: Seq[ApplicationInfo]