tgravescs commented on a change in pull request #25409: [SPARK-28414][WEBUI] UI 
updates to show resource info in Standalone
URL: https://github.com/apache/spark/pull/25409#discussion_r317131068
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/deploy/worker/Worker.scala
 ##########
 @@ -242,6 +243,22 @@ private[deploy] class Worker(
           System.exit(1)
         }
     }
+    resources.keys.foreach { rName =>
+      resourcesUsed(rName) = MutableResourceInfo(rName, new HashSet[String])
+    }
+  }
+
+  private def updateResourcesUsed(deltaInfo: Map[String, ResourceInformation], 
add: Boolean)
 
 Review comment:
   I'd say just create 2 functions for this, when looking at how this gets 
called its not nearly as clear as just saying addResourcesUsed, 
removeResourceUsed, user has to figure out what other parameter is.
   also shrinks the code as you simply need 2 lines:
   deltaInfo.foreach { case (rName, rInfo) =>
         resourcesUsed(rName) += resourcesUsed(rName) + rInfo
       }
   

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