Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19468#discussion_r150701656
--- Diff:
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/ConfigurationUtils.scala
---
@@ -0,0 +1,50 @@
+/*
+ * 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.k8s
+
+import org.apache.spark.SparkConf
+
+private[spark] object ConfigurationUtils {
+
+ /**
+ * Extract and parse Spark configuration properties with a given name
prefix and
+ * return the result as a Map. Keys must not have more than one value.
+ *
+ * @param sparkConf Spark configuration
+ * @param prefix the given property name prefix
+ * @param configType a descriptive note on the type of entities of
interest
+ * @return a Map storing the configuration property keys and values
+ */
+ def parsePrefixedKeyValuePairs(
+ sparkConf: SparkConf,
+ prefix: String,
+ configType: String): Map[String, String] = {
+ val fromPrefix = sparkConf.getAllWithPrefix(prefix)
+ fromPrefix.groupBy(_._1).foreach {
+ case (key, values) =>
+ require(values.size == 1,
--- End diff --
Can this ever trigger given that `sparkConf` is basically a map?
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