Flink使用者连接到具有多个分区的Kafka集群的java.lang.RuntimeException

Question

java.lang.RuntimeException: topicName
    at org.apache.flink.streaming.connectors.kafka.internal.KafkaPartitionDiscoverer.getAllPartitionsForTopics(KafkaPartitionDiscoverer.java:80)
    at org.apache.flink.streaming.connectors.kafka.internals.AbstractPartitionDiscoverer.discoverPartitions(AbstractPartitionDiscoverer.java:131)
    at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.open(FlinkKafkaConsumerBase.java:508)
    at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36)
    at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:102)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:529)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:393)
    at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:705)
    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:530)
    at java.lang.Thread.run(Thread.java:748)

我的消费者代码如下所示：

  def defineKafkaDataStream[A: TypeInformation](topic: String,
                                                env: StreamExecutionEnvironment,
                                                SASL_username:String,
                                                SASL_password:String,
                                                kafkaBootstrapServer: String = "localhost:9092",
                                                zookeeperHost: String = "localhost:2181",
                                                groupId: String = "test"
                                               )(implicit c: JsonConverter[A]): DataStream[A] = {
    val properties = new Properties()
    properties.setProperty("bootstrap.servers", kafkaBootstrapServer)
    properties.setProperty("security.protocol" , "SASL_SSL")
    properties.setProperty("sasl.mechanism" , "PLAIN")
    val jaasTemplate = "org.apache.kafka.common.security.plain.PlainLoginModule required username=\"%s\" password=\"%s\";"
    val jaasConfig = String.format(jaasTemplate, SASL_username, SASL_password)
    properties.setProperty("sasl.jaas.config", jaasConfig)
    properties.setProperty("group.id", "MyConsumerGroup")

    env
      .addSource(new FlinkKafkaConsumer(topic, new JSONKeyValueDeserializationSchema(true), properties))
      .map(x => x.convertTo[A](c))
  }

我是否应该设置另一个属性来允许单个作业从多个分区使用？

Answer 1

在我的过程中，经过四处挖掘和质疑，我发现了问题。

我查看了出现运行时异常的KafkaPartitionDiscoverer函数的Java代码。

我注意到的一节处理了RuntimeException

if (kafkaPartitions == null) {
    throw new RuntimeException("Could not fetch partitions for %s. Make sure that the topic exists.".format(topic));
    }

kafka-topics --describe --zookeeper serverIP:2181 --topic topicName

Error while executing topic command : Topics in [] does not exist
ERROR java.lang.IllegalArgumentException: Topics in [] does not exist
    at kafka.admin.TopicCommand$.kafka$admin$TopicCommand$$ensureTopicExists(TopicCommand.scala:435)
    at kafka.admin.TopicCommand$ZookeeperTopicService.describeTopic(TopicCommand.scala:350)
    at kafka.admin.TopicCommand$.main(TopicCommand.scala:66)
    at kafka.admin.TopicCommand.main(TopicCommand.scala)