Github user koeninger commented on a diff in the pull request:
https://github.com/apache/spark/pull/14340#discussion_r72251359
--- Diff:
external/kafka-0-10/src/main/scala/org/apache/spark/streaming/kafka010/KafkaUtils.scala
---
@@ -286,6 +285,30 @@ private[kafka010] class KafkaUtilsPythonHelper extends
Logging {
val kafkaRDD = kafkaRDDs.head.asInstanceOf[KafkaRDD[_, _]]
kafkaRDD.offsetRanges.toSeq.asJava
}
+
+ def commitAsyncForKafkaDStream(dstream: DStream[_], offsetRanges:
ju.List[OffsetRange]): Unit = {
+ val dstreams = new mutable.HashSet[DStream[_]]()
+
+ def visit(parent: DStream[_]): Unit = {
+ val parents = parent.dependencies
+ parents.filterNot(dstreams.contains).foreach { p =>
+ dstreams.add(p)
+ visit(p)
+ }
+ }
+ visit(dstream)
+
+ val kafkaDStreams = dstreams.filter(s =>
s.isInstanceOf[DirectKafkaInputDStream[_, _]])
+ require(
+ kafkaDStreams.size == 1,
+ "Cannot commit offset ranges to DirectKafkaInputDStream, as there
may be multiple Kafka " +
--- End diff --
It's slightly odd to refer to private classes in an error message. But it
may make more sense than referring to the CanCommitOffsets / HasOffsets
interfaces ... from a python user point of view, which do you think is more
likely to make sense?
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