spark: 从pulsar中读取数据

一、依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>pulsar-demo2</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <pulsar.version>2.8.0</pulsar.version>
        <jackson.version>2.10.5</jackson.version>
        <!--<jackson.version>2.6.7</jackson.version>-->

    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.pulsar</groupId>
            <artifactId>pulsar-client-all</artifactId>
            <version>${pulsar.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.pulsar</groupId>
            <artifactId>pulsar-client-kafka</artifactId>
            <version>${pulsar.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.pulsar</groupId>
            <artifactId>pulsar-spark</artifactId>
            <version>${pulsar.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.spark</groupId>
                    <artifactId>spark-streaming_2.10</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

<!--

        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-streaming_2.11</artifactId>
            <version>2.4.0</version>
        </dependency>-->


        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${jackson.version}</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-streaming_2.12</artifactId>
            <version>3.0.0</version>
        </dependency>
        
    </dependencies>

</project>

二、demo程序

package cn.edu.tju;

import org.apache.pulsar.client.impl.auth.AuthenticationDisabled;
import org.apache.pulsar.client.impl.conf.ConsumerConfigurationData;
import org.apache.pulsar.spark.SparkStreamingPulsarReceiver;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.streaming.Durations;
import org.apache.spark.streaming.api.java.JavaDStream;
import org.apache.spark.streaming.api.java.JavaReceiverInputDStream;
import org.apache.spark.streaming.api.java.JavaStreamingContext;

import java.util.HashSet;
import java.util.Set;

public class SparkTest {
    public static void main(String[] args) throws Exception{
        String serviceUrl = "pulsar://xx.xx.xx.xx:6650/";
        String topic = "persistent://public/default/my-topic11";
        String subs = "test_sub";

        SparkConf conf = new SparkConf().setMaster("local[2]").setAppName("NetworkWordCount");
        JavaStreamingContext jsc = new JavaStreamingContext(conf, Durations.seconds(4));

        ConsumerConfigurationData<byte[]> pulsarConf = new ConsumerConfigurationData();

        Set<String> set = new HashSet<>();
        set.add(topic);
        pulsarConf.setTopicNames(set);
        pulsarConf.setSubscriptionName(subs);

        SparkStreamingPulsarReceiver pulsarReceiver = new SparkStreamingPulsarReceiver(
                serviceUrl,
                pulsarConf,
                new AuthenticationDisabled());

        JavaReceiverInputDStream<byte[]> lineDStream = jsc.receiverStream(pulsarReceiver);

        JavaDStream<String> resultStream = lineDStream.map(new Function<byte[], String>() {
            @Override
            public String call(byte[] bytes) throws Exception {
                return new String(bytes);
            }
        });

        resultStream.print();

        jsc.start();
        jsc.awaitTermination();
    }
}