[SPARK-7503] [YARN] Resources in .sparkStaging directory can't be cleaned up on error

When we run applications on YARN with cluster mode, uploaded resources on .sparkStaging directory can't be cleaned up in case of failure of uploading local resources.

You can see this issue by running following command.
```
bin/spark-submit --master yarn --deploy-mode cluster --class <someClassName> <non-existing-jar>
```

Author: Kousuke Saruta <[email protected]>

Closes apache#6026 from sarutak/delete-uploaded-resources-on-error and squashes the following commits:

caef9f4 [Kousuke Saruta] Fixed style
882f921 [Kousuke Saruta] Wrapped Client#submitApplication with try/catch blocks in order to delete resources on error
1786ca4 [Kousuke Saruta] Merge branch 'master' of https://github.com/apache/spark into delete-uploaded-resources-on-error
f61071b [Kousuke Saruta] Fixed cleanup problem

Author: sarutak

yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala

@@ -17,7 +17,7 @@
 
 package org.apache.spark.deploy.yarn
 
-import java.io.{ByteArrayInputStream, DataInputStream, File, FileOutputStream}
+import java.io.{ByteArrayInputStream, DataInputStream, File, FileOutputStream, IOException}
 import java.net.{InetAddress, UnknownHostException, URI, URISyntaxException}
 import java.nio.ByteBuffer
 import java.security.PrivilegedExceptionAction
@@ -91,30 +91,52 @@ private[spark] class Client(
    * available in the alpha API.
    */
   def submitApplication(): ApplicationId = {
-    // Setup the credentials before doing anything else, so we have don't have issues at any point.
-    setupCredentials()
-    yarnClient.init(yarnConf)
-    yarnClient.start()
-
-    logInfo("Requesting a new application from cluster with %d NodeManagers"
-      .format(yarnClient.getYarnClusterMetrics.getNumNodeManagers))
-
-    // Get a new application from our RM
-    val newApp = yarnClient.createApplication()
-    val newAppResponse = newApp.getNewApplicationResponse()
-    val appId = newAppResponse.getApplicationId()
-
-    // Verify whether the cluster has enough resources for our AM
-    verifyClusterResources(newAppResponse)
-
-    // Set up the appropriate contexts to launch our AM
-    val containerContext = createContainerLaunchContext(newAppResponse)
-    val appContext = createApplicationSubmissionContext(newApp, containerContext)
-
-    // Finally, submit and monitor the application
-    logInfo(s"Submitting application ${appId.getId} to ResourceManager")
-    yarnClient.submitApplication(appContext)
-    appId
+    var appId: ApplicationId = null
+    try {
+      // Setup the credentials before doing anything else,
+      // so we have don't have issues at any point.
+      setupCredentials()
+      yarnClient.init(yarnConf)
+      yarnClient.start()
+
+      logInfo("Requesting a new application from cluster with %d NodeManagers"
+        .format(yarnClient.getYarnClusterMetrics.getNumNodeManagers))
+
+      // Get a new application from our RM
+      val newApp = yarnClient.createApplication()
+      val newAppResponse = newApp.getNewApplicationResponse()
+      appId = newAppResponse.getApplicationId()
+
+      // Verify whether the cluster has enough resources for our AM
+      verifyClusterResources(newAppResponse)
+
+      // Set up the appropriate contexts to launch our AM
+      val containerContext = createContainerLaunchContext(newAppResponse)
+      val appContext = createApplicationSubmissionContext(newApp, containerContext)
+
+      // Finally, submit and monitor the application
+      logInfo(s"Submitting application ${appId.getId} to ResourceManager")
+      yarnClient.submitApplication(appContext)
+      appId
+    } catch {
+      case e: Throwable =>
+        if (appId != null) {
+          val appStagingDir = getAppStagingDir(appId)
+          try {
+            val preserveFiles = sparkConf.getBoolean("spark.yarn.preserve.staging.files", false)
+            val stagingDirPath = new Path(appStagingDir)
+            val fs = FileSystem.get(hadoopConf)
+            if (!preserveFiles && fs.exists(stagingDirPath)) {
+              logInfo("Deleting staging directory " + stagingDirPath)
+              fs.delete(stagingDirPath, true)
+            }
+          } catch {
+            case ioe: IOException =>
+              logWarning("Failed to cleanup staging dir " + appStagingDir, ioe)
+          }
+        }
+        throw e
+    }
   }
 
   /**