Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/20761#discussion_r220022522
--- Diff:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ResourceTypeValidator.scala
---
@@ -0,0 +1,106 @@
+/*
+ * 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.yarn
+
+import scala.collection.mutable
+
+import org.apache.spark.{SparkConf, SparkException}
+import org.apache.spark.deploy.yarn.config._
+
+private object ResourceTypeValidator {
+ private val ERROR_PREFIX: String = "Error: "
+ private val POSSIBLE_RESOURCE_DEFINITIONS = Seq[(String, String)](
+ ("spark.yarn.am.memory", YARN_AM_RESOURCE_TYPES_PREFIX + "memory"),
--- End diff --
Use config constants (e.g. `AM_MEMORY.key` for this one).
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