Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/5144#discussion_r28016193
--- Diff:
core/src/main/scala/org/apache/spark/deploy/mesos/MesosClusterDispatcher.scala
---
@@ -0,0 +1,207 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.deploy.mesos
+
+import java.io.File
+import java.util.concurrent.CountDownLatch
+
+import org.apache.spark
+import
org.apache.spark.deploy.mesos.MesosClusterDispatcher.ClusterDispatcherArguments
+import org.apache.spark.deploy.mesos.ui.MesosClusterUI
+import org.apache.spark.deploy.rest.mesos.MesosRestServer
+import org.apache.spark.scheduler.cluster.mesos._
+import org.apache.spark.util.{IntParam, SignalLogger, Utils}
+import org.apache.spark.{Logging, SecurityManager, SparkConf}
+
+/*
+ * A dispatcher that is responsible for managing and launching drivers,
and is intended to
+ * be used for Mesos cluster mode. The dispatcher is launched by the user
in the cluster,
+ * which it launches a [[MesosRestServer]] for listening for driver
requests, and launches a
+ * [[MesosClusterScheduler]] to launch these drivers in the Mesos cluster.
+ *
+ * A typical new driver lifecycle is the following:
+ *
+ * - Driver submitted via spark-submit talking to the [[MesosRestServer]]
+ * - [[MesosRestServer]] queues the driver request to
[[MesosClusterScheduler]]
+ * - [[MesosClusterScheduler]] gets resource offers and launches the
drivers that are in queue
+ *
+ * This dispatcher supports both Mesos fine-grain or coarse-grain mode as
the mode is configurable
+ * per driver launched.
+ * This class is needed since Mesos doesn't manage frameworks, so the
dispatcher acts as
+ * a daemon to launch drivers as Mesos frameworks upon request.
+ */
+private[mesos] class MesosClusterDispatcher(
+ args: ClusterDispatcherArguments,
+ conf: SparkConf)
+ extends Logging {
+
+ private def publicAddress(conf: SparkConf, host: String): String = {
--- End diff --
`host` is more like `defaultAddress`
---
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