Github user markgrover commented on a diff in the pull request:
https://github.com/apache/spark/pull/10953#discussion_r51524399
--- Diff:
external/kafka-newapi/src/main/scala/org/apache/spark/streaming/kafka/newapi/KafkaRDD.scala
---
@@ -0,0 +1,237 @@
+/*
+ * 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.newapi
+
+import java.util.{Collections, Properties}
+
+import scala.collection.JavaConverters._
+import scala.collection.mutable.ArrayBuffer
+import scala.reflect.ClassTag
+
+import org.apache.kafka.clients.consumer.{ConsumerRecord, KafkaConsumer}
+import org.apache.kafka.common.TopicPartition
+
+import org.apache.spark.{Logging, Partition, SparkContext, TaskContext}
+import org.apache.spark.partial.{BoundedDouble, PartialResult}
+import org.apache.spark.rdd.RDD
+import org.apache.spark.streaming.kafka.newapi.KafkaCluster.LeaderOffset
+import org.apache.spark.util.NextIterator
+
+
+
+/**
+ * A batch-oriented interface for consuming from Kafka.
+ * Starting and ending offsets are specified in advance,
+ * so that you can control exactly-once semantics.
+ *
+ * @param kafkaParams Kafka <a
href="http://kafka.apache.org/documentation.html#configuration";>
+ * configuration parameters</a>. Requires
"bootstrap.servers" to be set
+ * with Kafka broker(s) specified in
host1:port1,host2:port2 form.
+ * @param offsetRanges offset ranges that define the Kafka data belonging
to this RDD
+ */
+private[kafka]
+class KafkaRDD[K: ClassTag, V: ClassTag, R: ClassTag] private[spark] (
+ sc: SparkContext,
+ kafkaParams: Map[String, String],
+ val offsetRanges: Array[OffsetRange],
+ messageHandler: ConsumerRecord[K, V] => R
+ ) extends RDD[R](sc, Nil) with Logging with HasOffsetRanges {
+
+ private val KAFKA_DEFAULT_POLL_TIME: String = "0"
--- End diff --
Hi Mario, Based on these API docs, it seems like 0 is a valid option:
https://kafka.apache.org/090/javadoc/org/apache/kafka/clients/consumer/KafkaConsumer.html#poll(long)
If you can explain further why 0 is problematic, I'd appreciate that, and
am happy to make suggested changes, I don't see the problem just yet:-)
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