SPARK-850: Give better error message on the console

core/src/main/scala/spark/scheduler/cluster/ClusterScheduler.scala

@@ -206,7 +206,8 @@ private[spark] class ClusterScheduler(val sc: SparkContext)
           override def run() {
             if (!hasLaunchedTask) {
               logWarning("Initial job has not accepted any resources; " +
-                "check your cluster UI to ensure that workers are registered")
+                "check your cluster UI to ensure that workers are registered " +
+                "and have sufficient memory")
             } else {
               this.cancel()
             }

project/SparkBuild.scala

@@ -156,7 +156,7 @@ object SparkBuild extends Build {
   def coreSettings = sharedSettings ++ Seq(
     name := "spark-core",
     resolvers ++= Seq(
-      "JBoss Repository" at "http://repository.jboss.org/nexus/content/repositories/releases/",
+      // "JBoss Repository" at "http://repository.jboss.org/nexus/content/repositories/releases/",
       "Spray Repository" at "http://repo.spray.cc/",
       "Cloudera Repository" at "https://repository.cloudera.com/artifactory/cloudera-repos/"
     ),