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[英]How do I extract values from a kafka row via spark under structured streaming?
[英]How do I connect to a Kerberos-secured Kafka cluster with Spark Structured Streaming?
我正在尝试使用结构化流API连接到受Kerberos保护的Kafka群集。 下面是我的代码和Spark的输出。 我看不到任何异常,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
...
我发现了我的问题。 指定安全协议选项时,选项名称必须以“ kafka”为前缀。 这令人困惑,因为对于普通的Kafka使用者而言,该选项仅是security.protocol,但出于配置Spark的目的, 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作为前缀。 。 我的原始代码是:
.option("security.protocol", "SASL_PLAINTEXT")
正确的选项是:
.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()
}
}
供参考,这是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";
};
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