[SPARK-5771] Number of Cores in Completed Applications of Standalone Master Web Page always be 0 if sc.stop() is called

In Standalone mode, the number of cores in Completed Applications of the Master Web Page will always be zero, if sc.stop() is called.
But the number will always be right, if sc.stop() is not called.
The reason maybe:
after sc.stop() is called, the function removeExecutor of class ApplicationInfo will be called, thus reduce the variable coresGranted to zero. The variable coresGranted is used to display the number of Cores on the Web Page.

Author: guliangliang <[email protected]>

Closes #4567 from marsishandsome/Spark5771 and squashes the following commits:

694796e [guliangliang] remove duplicate code
a20e390 [guliangliang] change to Cores Using & Requested
0c19c95 [guliangliang] change Cores to Cores (max)
cfbd97d [guliangliang] [SPARK-5771] Number of Cores in Completed Applications of Standalone Master Web Page always be 0 if sc.stop() is called

Author: guliangliang

core/src/main/scala/org/apache/spark/deploy/master/ApplicationInfo.scala

@@ -90,9 +90,9 @@ private[spark] class ApplicationInfo(
     }
   }
 
-  private val myMaxCores = desc.maxCores.getOrElse(defaultCores)
+  val requestedCores = desc.maxCores.getOrElse(defaultCores)
 
-  def coresLeft: Int = myMaxCores - coresGranted
+  def coresLeft: Int = requestedCores - coresGranted
 
   private var _retryCount = 0
 

core/src/main/scala/org/apache/spark/deploy/master/ui/MasterPage.scala

@@ -50,12 +50,16 @@ private[spark] class MasterPage(parent: MasterWebUI) extends WebUIPage("") {
     val workers = state.workers.sortBy(_.id)
     val workerTable = UIUtils.listingTable(workerHeaders, workerRow, workers)
 
-    val appHeaders = Seq("Application ID", "Name", "Cores", "Memory per Node", "Submitted Time",
-      "User", "State", "Duration")
+    val activeAppHeaders = Seq("Application ID", "Name", "Cores in Use",
+      "Cores Requested", "Memory per Node", "Submitted Time", "User", "State", "Duration")
     val activeApps = state.activeApps.sortBy(_.startTime).reverse
-    val activeAppsTable = UIUtils.listingTable(appHeaders, appRow, activeApps)
+    val activeAppsTable = UIUtils.listingTable(activeAppHeaders, activeAppRow, activeApps)
+
+    val completedAppHeaders = Seq("Application ID", "Name", "Cores Requested", "Memory per Node",
+      "Submitted Time", "User", "State", "Duration")
     val completedApps = state.completedApps.sortBy(_.endTime).reverse
-    val completedAppsTable = UIUtils.listingTable(appHeaders, appRow, completedApps)
+    val completedAppsTable = UIUtils.listingTable(completedAppHeaders, completeAppRow,
+      completedApps)
 
     val driverHeaders = Seq("Submission ID", "Submitted Time", "Worker", "State", "Cores",
       "Memory", "Main Class")
@@ -162,16 +166,23 @@ private[spark] class MasterPage(parent: MasterWebUI) extends WebUIPage("") {
     </tr>
   }
 
-  private def appRow(app: ApplicationInfo): Seq[Node] = {
+  private def appRow(app: ApplicationInfo, active: Boolean): Seq[Node] = {
     <tr>
       <td>
         <a href={"app?appId=" + app.id}>{app.id}</a>
       </td>
       <td>
         <a href={app.desc.appUiUrl}>{app.desc.name}</a>
       </td>
+      {
+        if (active) {
+          <td>
+            {app.coresGranted}
+          </td>
+        }
+      }
       <td>
-        {app.coresGranted}
+        {app.requestedCores}
       </td>
       <td sorttable_customkey={app.desc.memoryPerSlave.toString}>
         {Utils.megabytesToString(app.desc.memoryPerSlave)}
@@ -183,6 +194,14 @@ private[spark] class MasterPage(parent: MasterWebUI) extends WebUIPage("") {
     </tr>
   }
 
+  private def activeAppRow(app: ApplicationInfo): Seq[Node] = {
+    appRow(app, active = true)
+  }
+
+  private def completeAppRow(app: ApplicationInfo): Seq[Node] = {
+    appRow(app, active = false)
+  }
+
   private def driverRow(driver: DriverInfo): Seq[Node] = {
     <tr>
       <td>{driver.id} </td>