Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/7185#discussion_r33985403
--- 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[_,
_, _, _, _]])
+ if (kafkaRDDs.isEmpty) {
+ throw new IllegalStateException("Get offsetRanges from a non
KafkaRDD is illegal")
+ } else if (kafkaRDDs.length > 1) {
+ throw new IllegalStateException("Get offsetRanges from multiple
KafkaRDDs is unexpected")
--- End diff --
You can collapse all of these conditions into a require
```
require(
kafkaRDDs.length == 1,
"Cannot get offset ranges, as there may be multiple Kafka RDD associated
with this RDD. Please call this method only on a KafkaRDD.")
```
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