Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/7185#discussion_r34000251
--- Diff:
external/kafka/src/main/scala/org/apache/spark/streaming/kafka/KafkaUtils.scala
---
@@ -670,4 +670,17 @@ private class KafkaUtilsPythonHelper {
TopicAndPartition(topic, partition)
def createBroker(host: String, port: JInt): Broker = Broker(host, port)
+
+ def offsetRangesOfKafkaRDD(rdd: RDD[_]): JList[OffsetRange] = {
+ val parentRDDs = rdd.getNarrowAncestors
+ val kafkaRDDs = parentRDDs.filter(rdd => rdd.isInstanceOf[KafkaRDD[_,
_, _, _, _]])
--- End diff --
Personally I'd incline to use filter with `require(...)` as mentioned by TD
below to guard against some unexpected situations (more than one KafkaRDDs in
the lineage chain), since the lineage should not be long (2 or 3 dependencies),
so this is not a big problem.
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