Question

我正在尝试编写一个消费主题数据的Kafka Consumer。但每当我尝试运行它时，我得到以下错误。

Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply$mcV$sp(JobManager.scala:897)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply(JobManager.scala:840)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply(JobManager.scala:840)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:415)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.lang.NoSuchMethodError: org.apache.kafka.clients.consumer.KafkaConsumer.assign(Ljava/util/List;)V
at org.apache.flink.streaming.connectors.kafka.internal.KafkaConsumerCallBridge.assignPartitions(KafkaConsumerCallBridge.java:39)
at org.apache.flink.streaming.connectors.kafka.internal.KafkaConsumerThread.reassignPartitions(KafkaConsumerThread.java:391)
at org.apache.flink.streaming.connectors.kafka.internal.KafkaConsumerThread.run(KafkaConsumerThread.java:229)

Java类是：

import org.apache.flink.api.java.utils.ParameterTool;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer09;
import org.apache.flink.streaming.util.serialization.SimpleStringSchema;


public class KafkaConsumer {
public static void main(String[] args) throws Exception{
    StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
    ParameterTool parameterTool = ParameterTool.fromArgs(args);

    DataStream<String> stream = env.addSource(new FlinkKafkaConsumer09<String>("rdf-new", new SimpleStringSchema(), parameterTool.getProperties()));

    stream.print();
    env.execute();
}}

我在intellij中用相同的代码创建了一个独立的项目（有自己的pom）并且工作正常但是由于我需要另一个项目中的代码，我在已经存在的项目中创建了一个新的maven模块然后尝试运行它现在它显示我这个错误。

maven模块的pom.xml中的依赖项是：

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <flink.version>1.4.2</flink.version>
    <java.version>1.8</java.version>
    <scala.binary.version>2.11</scala.binary.version>
    <maven.compiler.source>${java.version}</maven.compiler.source>
    <maven.compiler.target>${java.version}</maven.compiler.target>
</properties>

<dependencies>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-java</artifactId>
        <version>${flink.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-streaming-java_2.11</artifactId>
        <version>${flink.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-clients_2.11</artifactId>
        <version>${flink.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-core</artifactId>
        <version>${flink.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-connector-kafka-0.9_2.11</artifactId>
        <version>${flink.version}</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.7</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-cep_2.11</artifactId>
        <version>${flink.version}</version>
    </dependency>
</dependencies>

我唯一注意到的是在maven模块中我将KafkaVersion作为1.1.0，但pom有KafkaConnector“flink-connector-kafka-0.9_2.11”

2018-05-18 11:14:56,105 - AbstractConfig                           [WARN] - ConsumerConfig            - The configuration 'zookeeper.connect' was supplied but isn't a known config. 
2018-05-18 11:14:56,105 - AppInfoParser$AppInfo                    [INFO] - AppInfoParser             - Kafka version : 1.1.0                              
2018-05-18 11:14:56,105 - AppInfoParser$AppInfo                    [INFO] - AppInfoParser             - Kafka commitId : fdcf75ea326b8e07

在独立项目中（消费者正常工作），Kafka版本为0.9.0.1。

11:32:19,537 WARN  org.apache.kafka.clients.consumer.ConsumerConfig              - The configuration zookeeper.connect = localhost:2181 was supplied but isn't a known config.
11:32:19,537 INFO  org.apache.kafka.common.utils.AppInfoParser                   - Kafka version : 0.9.0.1
11:32:19,538 INFO  org.apache.kafka.common.utils.AppInfoParser                   - Kafka commitId : 23c69d62a0cabf06

如果有人能告诉我可能出现什么问题，这将是一个巨大的帮助？这可能是因为pom文件中的依赖项，但是在独立项目中它也具有我所提供的相同依赖项。提前致谢。

Answer 1

正如您已经发现的问题是，在您的模块中，kafka版本（1.0）与flink连接器期望的版本（0.9）不匹配。

你可以这样做：

mvn dependency:tree

在命令行上找出kafka客户端依赖版本的来源。

在你的模块的pom中你可以添加一个dependencyManagement部分来覆盖你需要的kafka客户端库依赖版本，如下所示：

<dependencyManagement>
    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka-clients</artifactId>
        <version>0.9.0.1</version>
    </dependency>
</dependencyManagement>

使用flink的Kafka Consumer进行消费时获取错误“java.lang.NoSuchMethodError：org.apache.kafka.clients.consumer.KafkaConsumer.assign”

1 个答案: