Github user tdas commented on a diff in the pull request: https://github.com/apache/spark/pull/4537#discussion_r29533746 --- Diff: external/kafka/src/main/scala/org/apache/spark/streaming/kafka/KafkaTestUtils.scala --- @@ -227,10 +229,34 @@ private class KafkaTestUtils extends Logging { tryAgain(1) } + /** wait until the leader offset for the given topic/partition equals the specified offset */ + def waitUntilLeaderOffset( + topic: String, + partition: Int, + offset: Long): Unit = { + eventually(Time(10000), Time(100)) { + val kc = new KafkaCluster(Map("metadata.broker.list" -> brokerAddress)) + val tp = TopicAndPartition(topic, partition) + val llo = kc.getLatestLeaderOffsets(Set(tp)).right.get.apply(tp).offset + assert( + llo == offset, + s"$topic $partition $offset not reached after timeout") + } + } + private def waitUntilMetadataIsPropagated(topic: String, partition: Int): Unit = { eventually(Time(10000), Time(100)) { assert( - server.apis.metadataCache.containsTopicAndPartition(topic, partition), + server.apis.metadataCache.getPartitionInfo(topic, partition) match { --- End diff -- And also explain in a comment what this code does? For example, I am not sure what is `isr` in `leaderAndIsr`. And what are all these conditions &&-ed together.
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