scala - 如何使用 Spark 结构化流连接到受 Kerberos 保护的 Kafka 集群？

Question

我正在尝试使用结构化流 API 连接到受 Kerberos 保护的 Kafka 集群。下面是我的代码和 Spark 的输出。我没有看到任何异常，只是警告客户端断开连接的消息。解决此问题的下一步是什么？

import org.apache.spark.sql.SparkSession
import org.apache.log4j.{Logger, Level}

object Main {
  def main(args: Array[String]) {
    Logger.getLogger("org").setLevel(Level.WARN)
    Logger.getLogger("akka").setLevel(Level.WARN)

    val spark = SparkSession.builder()
      .master("local[*]")
      .appName("myapp")
      .config("spark.executor.extraJavaOptions", "java.security.auth.login.config=jaas.conf")
      .getOrCreate()

    import spark.implicits._

    val lines = spark.readStream.format("kafka")
      .option("kafka.bootstrap.servers", "broker1:9100,broker2:9100")
      .option("security.protocol", "SASL_PLAINTEXT")
      .option("sasl.kerberos.service.name", "mysvcname")
        .option("subscribe", "mytopic")
        .load()

    val query = lines.select("value").writeStream.format("console").start()
    query.awaitTermination()
}

这是输出:

Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
19/02/11 17:15:06 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
19/02/11 17:15:10 WARN NetworkClient: [Consumer clientId=consumer-1, groupId=spark-kafka-source-cef02569-ab16-4ca2-a9e8-18bcea992c0d--1359730493-driver-0] Bootstrap broker broker2:9100 (id: -2 rack: null) disconnected
19/02/11 17:15:11 WARN NetworkClient: [Consumer clientId=consumer-1, groupId=spark-kafka-source-cef02569-ab16-4ca2-a9e8-18bcea992c0d--1359730493-driver-0] Bootstrap broker broker1:9100 (id: -1 rack: null) disconnected
19/02/11 17:15:11 WARN NetworkClient: [Consumer clientId=consumer-1, groupId=spark-kafka-source-cef02569-ab16-4ca2-a9e8-18bcea992c0d--1359730493-driver-0] Bootstrap broker broker2:9100 (id: -2 rack: null) disconnected
19/02/11 17:15:11 WARN NetworkClient: [Consumer clientId=consumer-1, groupId=spark-kafka-source-cef02569-ab16-4ca2-a9e8-18bcea992c0d--1359730493-driver-0] Bootstrap broker broker1:9100 (id: -1 rack: null) disconnected
19/02/11 17:15:11 WARN NetworkClient: [Consumer clientId=consumer-1, groupId=spark-kafka-source-cef02569-ab16-4ca2-a9e8-18bcea992c0d--1359730493-driver-0] Bootstrap broker broker1:9100 (id: -1 rack: null) disconnected
19/02/11 17:15:11 WARN NetworkClient: [Consumer clientId=consumer-1, groupId=spark-kafka-source-cef02569-ab16-4ca2-a9e8-18bcea992c0d--1359730493-driver-0] Bootstrap broker broker2:9100 (id: -2 rack: null) disconnected
...

Answer 1

我发现了我的问题。指定安全协议(protocol)选项时，选项名称必须以“kafka.”为前缀。这很令人困惑，因为对于普通的 Kafka 消费者来说，该选项只是 security.protocol，但为了配置 Spark，bootstrap.servers 和 security.protocol(以及您可能需要的任何其他选项/属性)都必须以 kafka.. 为前缀。我的原始代码是:

.option("security.protocol", "SASL_PLAINTEXT")

正确的选择是:

.option("kafka.security.protocol", "SASL_PLAINTEXT")

这是有效的完整代码:

import org.apache.spark.sql.SparkSession
import org.apache.log4j.{Level, Logger}

object Main {
  def main(args: Array[String]) {
    Logger.getLogger("org").setLevel(Level.INFO)
    Logger.getLogger("akka").setLevel(Level.INFO)

    val spark = SparkSession.builder()
      .master("local[*]")
      .appName("myapp")
      .config("spark.executor.extraJavaOptions", "java.security.auth.login.config=c:/krb/jaas.conf")
      .getOrCreate()

    import spark.implicits._

    val lines = spark.readStream.format("kafka")
      .option("kafka.bootstrap.servers", "broker1:9100,broker2:9100")
      .option("kafka.security.protocol", "SASL_PLAINTEXT")
      .option("subscribe", "mytopic")
      .load()

    val query = lines.select("value").writeStream.format("console").start()
    query.awaitTermination()
  }
}

作为引用，这里是 jaas.conf 文件的内容:

KafkaClient {
  com.sun.security.auth.module.Krb5LoginModule required
  useKeyTab=true
  keyTab="c:/krb/mykeytab.keytab"
  principal="myaccount@mydomain.int"
  storeKey=true
  useTicketCache=false
  serviceName="myservicename";
};