Question

HashSet<String> topicsSet = new HashSet<String>(Arrays.asList(config.getKafkaTopics().split(",")));
HashMap<String, String> kafkaParams = new HashMap<String, String>();
kafkaParams.put("metadata.broker.list", config.getKafkaBrokers());

// Create direct KAFKA stream with brokers and topics
JavaPairInputDStream<String, String> messages = KafkaUtils.createDirectStream(jssc, String.class, String.class,
        StringDecoder.class, StringDecoder.class, kafkaParams, topicsSet);

我正在使用createDirectStream中的KafkaUtils函数创建Kafka流，如上所示。我认为它非常标准，我认为它适用于Spark-1.5.1。

我切换到Spark-1.6.1，虽然我不确定这是否是因为版本，但它会引发以下错误：

Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.apache.spark.deploy.worker.DriverWrapper$.main(DriverWrapper.scala:58)
    at org.apache.spark.deploy.worker.DriverWrapper.main(DriverWrapper.scala)
Caused by: java.lang.NoSuchMethodError: scala.Predef$.ArrowAssoc(Ljava/lang/Object;)Ljava/lang/Object;
    at kafka.api.RequestKeys$.<init>(RequestKeys.scala:39)
    at kafka.api.RequestKeys$.<clinit>(RequestKeys.scala)
    at kafka.api.TopicMetadataRequest.<init>(TopicMetadataRequest.scala:53)
    at org.apache.spark.streaming.kafka.KafkaCluster.getPartitionMetadata(KafkaCluster.scala:122)
    at org.apache.spark.streaming.kafka.KafkaCluster.getPartitions(KafkaCluster.scala:112)
    at org.apache.spark.streaming.kafka.KafkaUtils$.getFromOffsets(KafkaUtils.scala:211)
    at org.apache.spark.streaming.kafka.KafkaUtils$.createDirectStream(KafkaUtils.scala:484)
    at org.apache.spark.streaming.kafka.KafkaUtils$.createDirectStream(KafkaUtils.scala:607)
    at org.apache.spark.streaming.kafka.KafkaUtils.createDirectStream(KafkaUtils.scala)
    at com.analytics.kafka.consumer.SystemUserAnalyticsConsumer.main(SystemUserAnalyticsConsumer.java:59)
    ... 6 more

这几乎没有提供关于问题究竟是什么的信息。

这里有什么问题？

Answer 1

您在编译/构建时和运行时使用的Scala版本使用不兼容的spark-streaming-kafka-0-10版本，即

libraryDependencies += "org.apache.spark" %% "spark-streaming-kafka-0-10" % "2.0.1"

确保Scala版本相似（并注意两个百分号，它们会照顾它并依赖scalaVersion）。

为什么KafkaUtils.createDirectStream会抛出NoSuchMethodError？

1 个答案: