Some usability improvements

core/src/main/scala/org/apache/spark/deploy/ClientArguments.scala

@@ -17,6 +17,8 @@
 
 package org.apache.spark.deploy
 
+import java.net.URL
+
 import scala.collection.mutable.ListBuffer
 
 import org.apache.log4j.Level
@@ -68,8 +70,18 @@ private[spark] class ClientArguments(args: Array[String]) {
 
     case "launch" :: _master :: _jarUrl :: _mainClass :: tail =>
       cmd = "launch"
-      master = _master
+
+      try {
+        new URL(_jarUrl)
+      } catch {
+        case e: Exception =>
+          println(s"Jar url '${_jarUrl}' is not a valid URL.")
+          println(s"Jar must be in URL format (e.g. hdfs://XX, file://XX)")
+          printUsageAndExit(-1)
+      }
+
       jarUrl = _jarUrl
+      master = _master
       mainClass = _mainClass
       _driverOptions ++= tail
 

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

@@ -63,6 +63,10 @@ private[spark] class IndexPage(parent: MasterWebUI) {
     val completedDrivers = state.completedDrivers.sortBy(_.startTime).reverse
     val completedDriversTable = UIUtils.listingTable(driverHeaders, driverRow, completedDrivers)
 
+    // For now we only show driver information if the user has submitted drivers to the cluster.
+    // This is until we integrate the notion of drivers and applications in the UI.
+    def hasDrivers = activeDrivers.length > 0 || completedDrivers.length > 0
+
     val content =
         <div class="row-fluid">
           <div class="span12">
@@ -98,26 +102,35 @@ private[spark] class IndexPage(parent: MasterWebUI) {
           </div>
         </div>
 
-        <div class="row-fluid">
-          <div class="span12">
-            <h4> Completed Applications </h4>
-            {completedAppsTable}
+        <div>
+          {if (hasDrivers)
+          <div class="row-fluid">
+            <div class="span12">
+              <h4> Running Drivers </h4>
+              {activeDriversTable}
+            </div>
           </div>
+          }
         </div>
 
         <div class="row-fluid">
           <div class="span12">
-            <h4> Active Drivers </h4>
-            {activeDriversTable}
+            <h4> Completed Applications </h4>
+            {completedAppsTable}
           </div>
         </div>
 
-        <div class="row-fluid">
-          <div class="span12">
-            <h4> Completed Drivers </h4>
-            {completedDriversTable}
+        <div>
+          {if (hasDrivers)
+          <div class="row-fluid">
+            <div class="span12">
+              <h4> Completed Drivers </h4>
+              {completedDriversTable}
+            </div>
           </div>
+          }
         </div>;
+
     UIUtils.basicSparkPage(content, "Spark Master at " + state.uri)
   }
 
@@ -170,7 +183,7 @@ private[spark] class IndexPage(parent: MasterWebUI) {
       <td sorttable_customkey={driver.desc.mem.toString}>
         {Utils.megabytesToString(driver.desc.mem.toLong)}
       </td>
-      <td>{driver.desc.command.mainClass}</td>
+      <td>{driver.desc.command.arguments(1)}</td>
     </tr>
   }
 }

core/src/main/scala/org/apache/spark/deploy/worker/ui/IndexPage.scala

@@ -58,6 +58,10 @@ private[spark] class IndexPage(parent: WorkerWebUI) {
     val finishedDrivers = workerState.finishedDrivers.sortBy(_.driverId).reverse
     def finishedDriverTable = UIUtils.listingTable(driverHeaders, driverRow, finishedDrivers)
 
+    // For now we only show driver information if the user has submitted drivers to the cluster.
+    // This is until we integrate the notion of drivers and applications in the UI.
+    def hasDrivers = runningDrivers.length > 0 || finishedDrivers.length > 0
+
     val content =
         <div class="row-fluid"> <!-- Worker Details -->
           <div class="span12">
@@ -81,6 +85,17 @@ private[spark] class IndexPage(parent: WorkerWebUI) {
           </div>
         </div>
 
+        <div>
+          {if (hasDrivers)
+            <div class="row-fluid"> <!-- Running Drivers -->
+              <div class="span12">
+                <h4> Running Drivers {workerState.drivers.size} </h4>
+                {runningDriverTable}
+              </div>
+            </div>
+          }
+        </div>
+
         <div class="row-fluid"> <!-- Finished Executors  -->
           <div class="span12">
             <h4> Finished Executors </h4>
@@ -88,18 +103,15 @@ private[spark] class IndexPage(parent: WorkerWebUI) {
           </div>
         </div>
 
-        <div class="row-fluid"> <!-- Running Drivers -->
-          <div class="span12">
-            <h4> Running Drivers {workerState.drivers.size} </h4>
-            {runningDriverTable}
-          </div>
-        </div>
-
-        <div class="row-fluid"> <!-- Finished Drivers  -->
-          <div class="span12">
-            <h4> Finished Drivers </h4>
-            {finishedDriverTable}
-          </div>
+        <div>
+          {if (hasDrivers)
+            <div class="row-fluid"> <!-- Finished Drivers  -->
+              <div class="span12">
+                <h4> Finished Drivers </h4>
+                {finishedDriverTable}
+              </div>
+            </div>
+          }
         </div>;
 
     UIUtils.basicSparkPage(content, "Spark Worker at %s:%s".format(
@@ -133,7 +145,7 @@ private[spark] class IndexPage(parent: WorkerWebUI) {
   def driverRow(driver: DriverRunner): Seq[Node] = {
     <tr>
       <td>{driver.driverId}</td>
-      <td>{driver.driverDesc.command.mainClass}</td>
+      <td>{driver.driverDesc.command.arguments(1)}</td>
       <td>{driver.finalState.getOrElse(DriverState.RUNNING)}</td>
       <td sorttable_customkey={driver.driverDesc.cores.toString}>
         {driver.driverDesc.cores.toString}