Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/4216#discussion_r23735817
--- 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 --
are you referring to using java serialization on case classes? Thats
totally different from going to & from json. Even if you need to use some more
advanced api from jackson, eg. adding annotations or something, it still seems
like it would make the code a lot simpler.
I'm not familiar w/ jersey but sounds like it might be an even better
alternative
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