Kafka客户端版本0.10.1.0 导致 spark 只获取到一个分区的数据

        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>0.10.1.0</version> <!-- 该版本有问题 -->
        </dependency>

替换依赖版本为 0.10.0.1、0.10.2.0 或更高即可
https://stackoverflow.com/questions/42239005/spark-structured-stream-get-messages-from-only-one-partition-of-kafka
有一个 topic 的分区数为 2 ，欲使用spark streaming读取，结果只能获取到一个分区的数据，附代码

def main(args: Array[String]): Unit = {

    val conf = new SparkConf()
      .setAppName(getClass.getName)
      .setMaster("local[*]")

    val ssc = new StreamingContext(conf, Seconds(5))
    ssc.sparkContext.setLogLevel("warn")

    val kafkaParams = Map[String, Object](
      "bootstrap.servers" -> bootstrapServer,
      "key.deserializer" -> classOf[StringDeserializer],
      "value.deserializer" -> classOf[StringDeserializer],
      "group.id" -> groupId,
      "auto.offset.reset" -> "earliest",
      "enable.auto.commit" -> (false: java.lang.Boolean)
    )

    val topics = Array(topic)
    val stream: InputDStream[ConsumerRecord[String, String]] = KafkaUtils.createDirectStream[String, String](
      ssc,
      PreferConsistent,
      Subscribe[String, String](topics, kafkaParams)
    )

    stream.foreachRDD(rdd => {
      // 获取偏移量
      val offsetRanges: Array[OffsetRange] = rdd.asInstanceOf[HasOffsetRanges].offsetRanges
      println(offsetRanges.mkString("Array( ", " ,  ", " )"))
      // action
      rdd.foreach(println)
      // 提交偏移量
      stream.asInstanceOf[CanCommitOffsets].commitAsync(offsetRanges)
    })
    ssc.start()
    ssc.awaitTermination()
  }