Github user koeninger commented on a diff in the pull request: https://github.com/apache/spark/pull/4805#discussion_r25990749 --- Diff: external/kafka/src/main/scala/org/apache/spark/streaming/kafka/DirectKafkaInputDStream.scala --- @@ -158,4 +166,37 @@ class DirectKafkaInputDStream[ } } + private[streaming] + class DirectKafkaStreamingListener extends StreamingListener { + + val offsetCommitEnabled = context.conf.getBoolean("spark.streaming.kafka.offsetCommit", false) + + val zkClientOpt = if (offsetCommitEnabled) { + kafkaParams.get("zookeeper.connect").map { zkConnect => + val zkSessionTimeoutMs = kafkaParams.getOrElse("zookeeper.session.timeout.ms", "6000").toInt + val zkConnectionTimeoutMs = + kafkaParams.getOrElse("zookeeper.session.timeout.ms", "6000").toInt + new ZkClient(zkConnect, zkSessionTimeoutMs, zkConnectionTimeoutMs, ZKStringSerializer) + } + } else { + None + } + + val groupId = "directKafkaConsumer" + + override def onBatchCompleted(batchCompleted: StreamingListenerBatchCompleted) = synchronized { + if (offsetCommitEnabled) { + for (offsets <- offsetMap.get(batchCompleted.batchInfo.batchTime); client <- zkClientOpt) { --- End diff -- if offsetCommitEnabled, zkClientOpt should always be defined, yes? Why two separate checks? From a style point of view, people were complaining about monadic syntax earlier, I don't know that semicolon separated on a single line is an improvement.
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