Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4216#discussion_r23802796
--- Diff:
core/src/main/scala/org/apache/spark/deploy/rest/SubmitRestProtocolMessage.scala
---
@@ -0,0 +1,201 @@
+/*
+ * 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 scala.collection.Map
+import scala.collection.JavaConversions._
+
+import org.json4s.jackson.JsonMethods._
+import org.json4s.JsonAST._
+
+import org.apache.spark.Logging
+import org.apache.spark.util.Utils
+
+/**
+ * A general message exchanged in the stable application submission REST
protocol.
+ *
+ * The message is represented by a set of fields in the form of key value
pairs.
+ * Each message must contain an ACTION field, which fully specifies the
type of the message.
+ * For compatibility with older versions of Spark, existing fields must
not be removed or
+ * modified, though new fields can be added as necessary.
+ */
+private[spark] abstract class SubmitRestProtocolMessage(
+ action: SubmitRestProtocolAction,
+ actionField: ActionField,
+ requiredFields: Seq[SubmitRestProtocolField]) {
+
+ // Maintain the insert order for converting to JSON later
+ private val fields = new
java.util.LinkedHashMap[SubmitRestProtocolField, String]
+ val className = Utils.getFormattedClassName(this)
+
+ // Set the action field
+ fields.put(actionField, action.toString)
+
+ /** Return all fields currently set in this message. */
+ def getFields: Map[SubmitRestProtocolField, String] = fields.toMap
--- End diff --
BTW I'm not sure why we are arguing about this. The most important part is
the protocol itself, less so about how the protocol is implemented.
Implementation changes all the time, and can be changed easily.
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