AMBARI-14610 Sometimes Assign Slaves and Clients page works not properly. (ababiichuk)

ambari-web/app/controllers/wizard/step6_controller.js

@@ -73,6 +73,18 @@ App.WizardStep6Controller = Em.Controller.extend(App.BlueprintMixin, {
    */
   submitDisabled: false,
 
+  /**
+   * timer for validation request
+   */
+  timer: null,
+
+  /**
+   * true if request for validation is in progress
+   *
+   * @type {bool}
+   */
+  validationInProgress: false,
+
   /**
    * Check if <code>addHostWizard</code> used
    * @type {bool}
@@ -548,15 +560,24 @@ App.WizardStep6Controller = Em.Controller.extend(App.BlueprintMixin, {
   },
 
   callValidation: function (successCallback) {
-    this.callServerSideValidation(successCallback);
+    var self = this;
+    clearTimeout(this.get('timer'));
+    this.set('timer', setTimeout(function() {
+      if (self.get('validationInProgress')) {
+        self.callValidation(successCallback);
+      } else {
+        self.callServerSideValidation(successCallback);
+      }
+    }, 700));
   },
 
   /**
    * Update submit button status
-   * @metohd callServerSideValidation
+   * @method callServerSideValidation
    */
   callServerSideValidation: function (successCallback) {
     var self = this;
+    this.set('validationInProgress', true);
 
     var selectedServices = App.StackService.find().filterProperty('isSelected').mapProperty('serviceName');
     var installedServices = App.StackService.find().filterProperty('isInstalled').mapProperty('serviceName');
@@ -615,6 +636,7 @@ App.WizardStep6Controller = Em.Controller.extend(App.BlueprintMixin, {
       error: 'updateValidationsErrorCallback'
     }).
       then(function () {
+        self.set('validationInProgress', false);
         if (!self.get('submitDisabled') && successCallback) {
           successCallback();
         }