Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/5144#discussion_r28452718
--- Diff:
core/src/main/scala/org/apache/spark/deploy/rest/RestSubmissionServer.scala ---
@@ -0,0 +1,319 @@
+/*
+ * 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.rest
+
+import java.net.InetSocketAddress
+import javax.servlet.http.{HttpServlet, HttpServletRequest,
HttpServletResponse}
+
+import scala.io.Source
+import com.fasterxml.jackson.core.JsonProcessingException
+import org.eclipse.jetty.server.Server
+import org.eclipse.jetty.servlet.{ServletHolder, ServletContextHandler}
+import org.eclipse.jetty.util.thread.QueuedThreadPool
+import org.json4s._
+import org.json4s.jackson.JsonMethods._
+
+import org.apache.spark.{Logging, SparkConf, SPARK_VERSION => sparkVersion}
+import org.apache.spark.util.Utils
+
+/**
+ * A server that responds to requests submitted by the
[[RestSubmissionClient]].
+ *
+ * This server responds with different HTTP codes depending on the
situation:
+ * 200 OK - Request was processed successfully
+ * 400 BAD REQUEST - Request was malformed, not successfully validated,
or of unexpected type
+ * 468 UNKNOWN PROTOCOL VERSION - Request specified a protocol this
server does not understand
+ * 500 INTERNAL SERVER ERROR - Server throws an exception internally
while processing the request
+ *
+ * The server always includes a JSON representation of the relevant
[[SubmitRestProtocolResponse]]
+ * in the HTTP body. If an error occurs, however, the server will include
an [[ErrorResponse]]
+ * instead of the one expected by the client. If the construction of this
error response itself
+ * fails, the response will consist of an empty body with a response code
that indicates internal
+ * server error.
+ */
+private[spark] abstract class RestSubmissionServer(
+ val host: String,
+ val requestedPort: Int,
+ val masterConf: SparkConf) extends Logging {
--- End diff --
these need to be indented 2 more spaces
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