Abstract the success field to the general response

This was common basically across all response messages.

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

@@ -93,15 +93,19 @@ object SparkSubmit {
    * Standalone cluster mode only.
    */
   private def kill(args: SparkSubmitArguments): Unit = {
-    new StandaloneRestClient().killDriver(args.master, args.driverToKill)
+    val client = new StandaloneRestClient
+    val response = client.killDriver(args.master, args.driverToKill)
+    printStream.println(response.toJson)
   }
 
   /**
    * Request the status of an existing driver using the REST application submission protocol.
    * Standalone cluster mode only.
    */
   private def requestStatus(args: SparkSubmitArguments): Unit = {
-    new StandaloneRestClient().requestDriverStatus(args.master, args.driverToRequestStatusFor)
+    val client = new StandaloneRestClient
+    val response = client.requestDriverStatus(args.master, args.driverToRequestStatusFor)
+    printStream.println(response.toJson)
   }
 
   /**

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

@@ -22,7 +22,7 @@ import java.util.jar.JarFile
 
 import scala.collection.mutable.{ArrayBuffer, HashMap}
 
-import org.apache.spark.deploy.SparkSubmitAction.SparkSubmitAction
+import org.apache.spark.deploy.SparkSubmitAction._
 import org.apache.spark.util.Utils
 
 /**
@@ -52,6 +52,7 @@ private[spark] class SparkSubmitArguments(args: Seq[String], env: Map[String, St
   var verbose: Boolean = false
   var isPython: Boolean = false
   var pyFiles: String = null
+  var action: SparkSubmitAction = null
   val sparkProperties: HashMap[String, String] = new HashMap[String, String]()
 
   // Standalone cluster mode only
@@ -62,17 +63,6 @@ private[spark] class SparkSubmitArguments(args: Seq[String], env: Map[String, St
 
   private val restEnabledKey = "spark.submit.rest.enabled"
 
-  def action: SparkSubmitAction = {
-    (driverToKill, driverToRequestStatusFor) match {
-      case (null, null) => SparkSubmitAction.SUBMIT
-      case (_, null) => SparkSubmitAction.KILL
-      case (null, _) => SparkSubmitAction.REQUEST_STATUS
-      case _ => SparkSubmit.printErrorAndExit(
-        "Requested to both kill and request status for a driver. Choose only one.")
-        null // never reached
-    }
-  }
-
   /** Default properties present in the currently defined defaults file. */
   lazy val defaultSparkProperties: HashMap[String, String] = {
     val defaultProperties = new HashMap[String, String]()
@@ -189,14 +179,17 @@ private[spark] class SparkSubmitArguments(args: Seq[String], env: Map[String, St
     if (name == null && primaryResource != null) {
       name = Utils.stripDirectory(primaryResource)
     }
+
+    // Action should be SUBMIT unless otherwise specified
+    action = Option(action).getOrElse(SUBMIT)
   }
 
   /** Ensure that required fields exists. Call this only once all defaults are loaded. */
   private def validateArguments(): Unit = {
     action match {
-      case SparkSubmitAction.SUBMIT => validateSubmitArguments()
-      case SparkSubmitAction.KILL => validateKillArguments()
-      case SparkSubmitAction.REQUEST_STATUS => validateStatusRequestArguments()
+      case SUBMIT => validateSubmitArguments()
+      case KILL => validateKillArguments()
+      case REQUEST_STATUS => validateStatusRequestArguments()
     }
   }
 
@@ -379,10 +372,18 @@ private[spark] class SparkSubmitArguments(args: Seq[String], env: Map[String, St
 
       case ("--kill") :: value :: tail =>
         driverToKill = value
+        if (action != null) {
+          SparkSubmit.printErrorAndExit(s"Action cannot be both $action and $KILL.")
+        }
+        action = KILL
         parse(tail)
 
       case ("--status") :: value :: tail =>
         driverToRequestStatusFor = value
+        if (action != null) {
+          SparkSubmit.printErrorAndExit(s"Action cannot be both $action and $REQUEST_STATUS.")
+        }
+        action = REQUEST_STATUS
         parse(tail)
 
       case ("--supervise") :: tail =>

core/src/main/scala/org/apache/spark/deploy/rest/DriverStatusRequest.scala

@@ -22,10 +22,8 @@ package org.apache.spark.deploy.rest
  */
 class DriverStatusRequest extends SubmitRestProtocolRequest {
   private val driverId = new SubmitRestProtocolField[String]("driverId")
-
   def getDriverId: String = driverId.toString
   def setDriverId(s: String): this.type = setField(driverId, s)
-
   protected override def doValidate(): Unit = {
     super.doValidate()
     assertFieldIsSet(driverId)

core/src/main/scala/org/apache/spark/deploy/rest/DriverStatusResponse.scala

@@ -22,27 +22,23 @@ package org.apache.spark.deploy.rest
  */
 class DriverStatusResponse extends SubmitRestProtocolResponse {
   private val driverId = new SubmitRestProtocolField[String]("driverId")
-  private val success = new SubmitRestProtocolField[Boolean]("success")
   // standalone cluster mode only
   private val driverState = new SubmitRestProtocolField[String]("driverState")
   private val workerId = new SubmitRestProtocolField[String]("workerId")
   private val workerHostPort = new SubmitRestProtocolField[String]("workerHostPort")
 
   def getDriverId: String = driverId.toString
-  def getSuccess: String = success.toString
   def getDriverState: String = driverState.toString
   def getWorkerId: String = workerId.toString
   def getWorkerHostPort: String = workerHostPort.toString
 
   def setDriverId(s: String): this.type = setField(driverId, s)
-  def setSuccess(s: String): this.type = setBooleanField(success, s)
   def setDriverState(s: String): this.type = setField(driverState, s)
   def setWorkerId(s: String): this.type = setField(workerId, s)
   def setWorkerHostPort(s: String): this.type = setField(workerHostPort, s)
 
   protected override def doValidate(): Unit = {
     super.doValidate()
     assertFieldIsSet(driverId)
-    assertFieldIsSet(success)
   }
 }

core/src/main/scala/org/apache/spark/deploy/rest/ErrorResponse.scala

@@ -21,8 +21,12 @@ package org.apache.spark.deploy.rest
  * An error response message used in the REST application submission protocol.
  */
 class ErrorResponse extends SubmitRestProtocolResponse {
+  // request was unsuccessful
+  setSuccess("false")
+
   protected override def doValidate(): Unit = {
     super.doValidate()
     assertFieldIsSet(message)
+    assert(!getSuccess.toBoolean, "The 'success' field cannot be true in an error response.")
   }
 }

core/src/main/scala/org/apache/spark/deploy/rest/KillDriverRequest.scala

@@ -22,10 +22,8 @@ package org.apache.spark.deploy.rest
  */
 class KillDriverRequest extends SubmitRestProtocolRequest {
   private val driverId = new SubmitRestProtocolField[String]("driverId")
-
   def getDriverId: String = driverId.toString
   def setDriverId(s: String): this.type = setField(driverId, s)
-
   protected override def doValidate(): Unit = {
     super.doValidate()
     assertFieldIsSet(driverId)

core/src/main/scala/org/apache/spark/deploy/rest/KillDriverResponse.scala

@@ -22,17 +22,10 @@ package org.apache.spark.deploy.rest
  */
 class KillDriverResponse extends SubmitRestProtocolResponse {
   private val driverId = new SubmitRestProtocolField[String]("driverId")
-  private val success = new SubmitRestProtocolField[Boolean]("success")
-
   def getDriverId: String = driverId.toString
-  def getSuccess: String = success.toString
-
   def setDriverId(s: String): this.type = setField(driverId, s)
-  def setSuccess(s: String): this.type = setBooleanField(success, s)
-
   protected override def doValidate(): Unit = {
     super.doValidate()
     assertFieldIsSet(driverId)
-    assertFieldIsSet(success)
   }
 }

core/src/main/scala/org/apache/spark/deploy/rest/SubmitDriverResponse.scala

@@ -21,17 +21,7 @@ package org.apache.spark.deploy.rest
  * A response to the [[SubmitDriverRequest]] in the REST application submission protocol.
  */
 class SubmitDriverResponse extends SubmitRestProtocolResponse {
-  private val success = new SubmitRestProtocolField[Boolean]("success")
   private val driverId = new SubmitRestProtocolField[String]("driverId")
-
-  def getSuccess: String = success.toString
   def getDriverId: String = driverId.toString
-
-  def setSuccess(s: String): this.type = setBooleanField(success, s)
   def setDriverId(s: String): this.type = setField(driverId, s)
-
-  protected override def doValidate(): Unit = {
-    super.doValidate()
-    assertFieldIsSet(success)
-  }
 }

core/src/main/scala/org/apache/spark/deploy/rest/SubmitRestClient.scala

@@ -39,7 +39,7 @@ private[spark] abstract class SubmitRestClient extends Logging {
     val url = getHttpUrl(args.master)
     val request = constructSubmitRequest(args)
     val response = sendHttp(url, request)
-    handleResponse(response)
+    validateResponse(response)
   }
 
   /** Request that the REST server kill the specified driver. */
@@ -48,7 +48,7 @@ private[spark] abstract class SubmitRestClient extends Logging {
     val url = getHttpUrl(master)
     val request = constructKillRequest(master, driverId)
     val response = sendHttp(url, request)
-    handleResponse(response)
+    validateResponse(response)
   }
 
   /** Request the status of the specified driver from the REST server. */
@@ -57,7 +57,7 @@ private[spark] abstract class SubmitRestClient extends Logging {
     val url = getHttpUrl(master)
     val request = constructStatusRequest(master, driverId)
     val response = sendHttp(url, request)
-    handleResponse(response)
+    validateResponse(response)
   }
 
   /** Return the HTTP URL of the REST server that corresponds to the given master URL. */
@@ -95,14 +95,10 @@ private[spark] abstract class SubmitRestClient extends Logging {
     }
   }
 
-  /** Validate the response and log any error messages produced by the server. */
-  private def handleResponse(response: SubmitRestProtocolResponse): SubmitRestProtocolResponse = {
+  /** Validate the response... */
+  private def validateResponse(response: SubmitRestProtocolResponse): SubmitRestProtocolResponse = {
     try {
       response.validate()
-      response match {
-        case error: ErrorResponse => logError(s"Server returned error:\n${error.getMessage}")
-        case _ =>
-      }
     } catch {
       case e: SubmitRestProtocolException =>
         throw new SubmitRestProtocolException("Malformed response received from server", e)

core/src/main/scala/org/apache/spark/deploy/rest/SubmitRestProtocolMessage.scala

@@ -155,10 +155,20 @@ abstract class SubmitRestProtocolRequest extends SubmitRestProtocolMessage {
  */
 abstract class SubmitRestProtocolResponse extends SubmitRestProtocolMessage {
   protected override val sparkVersion = new SubmitRestProtocolField[String]("server_spark_version")
-  def getServerSparkVersion: String = sparkVersion.toString
-  def setServerSparkVersion(s: String): this.type = setField(sparkVersion, s)
+  private val success = new SubmitRestProtocolField[Boolean]("success")
+
   override def getSparkVersion: String = getServerSparkVersion
+  def getServerSparkVersion: String = sparkVersion.toString
+  def getSuccess: String = success.toString
+
   override def setSparkVersion(s: String) = setServerSparkVersion(s)
+  def setServerSparkVersion(s: String): this.type = setField(sparkVersion, s)
+  def setSuccess(s: String): this.type = setBooleanField(success, s)
+
+  protected override def doValidate(): Unit = {
+    super.doValidate()
+    assertFieldIsSet(success)
+  }
 }
 
 object SubmitRestProtocolMessage {