Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/13996#discussion_r69179473
--- Diff:
external/kafka-0-10/src/main/java/org/apache/spark/streaming/kafka010/LocationStrategy.java
---
@@ -0,0 +1,61 @@
+/*
+ * 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.kafka010;
+
+import java.util.Map;
+
+import scala.collection.JavaConversions;
+
+import org.apache.kafka.common.TopicPartition;
+import org.apache.spark.annotation.Experimental;
+
+/**
+ * :: Experimental ::
+ * Abstract class representing choice of how to schedule consumers for a
given TopicPartition on an
+ * executor. Kafka 0.10 consumers prefetch messages, so it's important for
performance to keep
+ * cached consumers on appropriate executors, not recreate them for every
partition. Choice of
+ * location is only a preference, not an absolute; partitions may be
scheduled elsewhere.
+ */
+@Experimental
+public abstract class LocationStrategy {
+
+ /**
+ * :: Experimental ::
+ * Use this in most cases, it will consistently distribute partitions
across all executors.
+ */
+ public static LocationStrategy PreferConsistent() {
+ return PreferConsistent$.MODULE$;
+ }
+
+ /**
+ * :: Experimental ::
+ * Use this only if your executors are on the same nodes as your Kafka
brokers.
+ */
+ public static LocationStrategy PreferBrokers() {
+ return PreferBrokers$.MODULE$;
+ }
+
+
+ public static LocationStrategy PreferFixed(Map<TopicPartition, String>
hostMap) {
--- End diff --
nit: docs?
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