Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/1420#discussion_r20130949
--- Diff:
external/kafka/src/main/scala/org/apache/spark/streaming/kafka/KafkaUtils.scala
---
@@ -151,4 +153,23 @@ object KafkaUtils {
createStream[K, V, U, T](
jssc.ssc, kafkaParams.toMap,
Map(topics.mapValues(_.intValue()).toSeq: _*), storageLevel)
}
+
+ /**
+ * Delete the consumer group related Zookeeper metadata immediately,
+ * force consumer to ignore previous consumer offset and directly read
data from the beginning
+ * or end of the partition. The behavior of reading data from the
beginning or end of the
+ * partition also relies on kafka parameter 'auto.offset.reset':
+ * When 'auto.offset.reset' = 'smallest', directly read data from
beginning,
+ * will re-read the whole partition.
+ * When 'auto.offset.reset' = 'largest', directly read data from end,
ignore old, unwanted data.
+ * This is default in Kafka 0.8.
+ *
+ * To avoid deleting existing Zookeeper metadata in each Receiver when
multiple consumers are
+ * launched, this should be called be createStream().
+ * @param zkQuorum Zookeeper quorum (hostname:port,hostname:port,..).
+ * @param groupId The group id for this consumer.
+ */
+ def resetOffset(zkQuorum: String, groupId: String) {
--- End diff --
I dont think it is good idea to expose have this utility function in our
API that is very specific to a particular version of Kafka. If this
functionality is required for some well-known version-specific Kafka issue,
then I am guessing there will be known workarounds in the Kafka-world and we
dont need to provide custom functionality for that. So I dont think we should
add this.
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