flink + Kafka：getHostnamePort

Question

我想从flink读一个kafka主题

package Toletum.pruebas;

    import org.apache.flink.api.common.functions.MapFunction;
    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.FlinkKafkaConsumer082;
    import org.apache.flink.streaming.util.serialization.SimpleStringSchema;

    public class LeeKafka {
        public static void main(String[] args) throws Exception {
            final ParameterTool parameterTool = ParameterTool.fromArgs(args);

            // create execution environment
            StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

            FlinkKafkaConsumer082 kafkaSrc = new FlinkKafkaConsumer082("test02", 
          new SimpleStringSchema(), 
          parameterTool.getProperties());

            DataStream messageStream = env.addSource(kafkaSrc);

            messageStream.rebalance().map(new MapFunction() {
                private static final long serialVersionUID = -6867736771747690202L;

                public String map(String value) throws Exception {
                    return "Kafka and Flink says: " + value;
                }
            }).print();

            env.execute("LeeKafka");
        }

    }

此代码成功运行：

java -cp Package.jar Toletum.pruebas.LeeKafka --topic test02 --bootstrap.servers kafka:9092 --zookeeper.connect zookeeper:2181 --group.id myGroup

但是，当我尝试使用flink时：

flink run -c Toletum.pruebas.LeeKafka pruebas-0.0.1-SNAPSHOT-jar-with-dependencies.jar --topic test02 --bootstrap.servers kafka:9092 --zookeeper.connect zookeeper:2181 --group.id myGroup

我收到一个错误：

java.lang.NoSuchMethodError: org.apache.flink.util.NetUtils.getHostnamePort(Ljava/lang/String;)Ljava/net/URL;
        at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer.getPartitionsForTopic(FlinkKafkaConsumer.java:592)
        at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer.(FlinkKafkaConsumer.java:280)
        at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer082.(FlinkKafkaConsumer082.java:49)
        at Toletum.pruebas.LeeKafka.main(LeeKafka.java:22)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:497)
        at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:395)
        at org.apache.flink.client.program.Client.runBlocking(Client.java:252)
        at org.apache.flink.client.CliFrontend.executeProgramBlocking(CliFrontend.java:676)
        at org.apache.flink.client.CliFrontend.run(CliFrontend.java:326)
        at org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:978)
        at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1028)

Answer 1

老版本的lib .....

正确的pom.xml：

            &ltdependency>
                    &ltgroupId&gtorg.apache.flink</groupId>
                    &ltartifactId&gtflink-connector-kafka</artifactId>
                    &ltversion&gt0.10.1</version>
            </dependency>

Answer 2

此问题是由于使用旧版本的FLink Connector库。

您可以查看最新的库并下载最新的Maven依赖项。

您还应考虑使用的Kafka版本。

尝试使用Flink Documentation for Kafka Connector的最新Maven依赖项

最新的maven依赖是

<dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-connector-kafka-0.8_2.10</artifactId>
  <version>1.3.2</version>
</dependency>