Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/4216#discussion_r23875609
--- Diff:
core/src/main/scala/org/apache/spark/deploy/rest/SubmitRestProtocolField.scala
---
@@ -0,0 +1,30 @@
+/*
+ * 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
+
+/**
+ * A field used in [[SubmitRestProtocolMessage]]s.
+ */
+class SubmitRestProtocolField[T](val name: String) {
--- End diff --
I think you don't need `name` anymore -- you end up needing to repeat the
field name a lot, when now jackson is taking care of putting the field name in
the json. Looks like its only used in `assertFieldIsSet`, which is only called
from `DriverStatusRequest` -- so you could just pass in a message for that one
case and dry up a lot of the code.
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