Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/3798#discussion_r23823372
--- Diff:
external/kafka/src/main/scala/org/apache/spark/streaming/kafka/Leader.scala ---
@@ -0,0 +1,68 @@
+/*
+ * 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.streaming.kafka
+
+import kafka.common.TopicAndPartition
+
+/** Host info for the leader of a Kafka TopicAndPartition */
+
+trait Leader {
--- End diff --
As I said earlier, traits are not great for maintaining binary
compatibility when you want to extend the trait. So lets either simple class
(private constructor), or a Java interface. Bunch of stuff in Spark are done
this way.
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