Apache spark 从kafka Spark流读取数据时获取空集
嗨,我是新的火花流。我正在尝试读取xml文件并将其发送到kafka topic。这是我的卡夫卡代码,它将数据发送到卡夫卡控制台消费者 代码:Apache spark 从kafka Spark流读取数据时获取空集,apache-spark,apache-kafka,spark-streaming,spark-dataframe,Apache Spark,Apache Kafka,Spark Streaming,Spark Dataframe,嗨,我是新的火花流。我正在尝试读取xml文件并将其发送到kafka topic。这是我的卡夫卡代码,它将数据发送到卡夫卡控制台消费者 代码: package org.apache.kafka.Kafka_Producer; import java.io.BufferedReader; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.u
package org.apache.kafka.Kafka_Producer;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Properties;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutionException;
import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;
@SuppressWarnings("unused")
public class KafkaProducer {
private static String sCurrentLine;
public static void main(String args[]) throws InterruptedException, ExecutionException{
try (BufferedReader br = new BufferedReader(new FileReader("/Users/sreeharsha/Downloads/123.txt")))
{
while ((sCurrentLine = br.readLine()) != null) {
System.out.println(sCurrentLine);
kafka(sCurrentLine);
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();}
}
public static void kafka(String sCurrentLine) {
Properties props = new Properties();
props.put("metadata.broker.list", "localhost:9092");
props.put("serializer.class", "kafka.serializer.StringEncoder");
props.put("partitioner.class","kafka.producer.DefaultPartitioner");
props.put("request.required.acks", "1");
ProducerConfig config = new ProducerConfig(props);
Producer<String, String> producer = new Producer<String, String>(config);
producer.send(new KeyedMessage<String, String>("sample",sCurrentLine));
producer.close();
}
}
下面您可以看到数据接收方式的屏幕截图:
使用以下版本:
Spark-2.0.0
动物园管理员-3.4.6
卡夫卡-0.8.2.1
请给我任何建议,在网上冲浪之后,我终于找到了这些解决方案 不要同时使用“Spark Submit”和“SetMaster”
- 如果从IDE运行代码,请在代码中使用SetMaster
- 如果您通过“Spark Submit”运行jar,请不要将setMaster放在代码中
工作正常。SparkReceiver类的代码在哪里?您已经发布了SparkStringConsumer类,在该类中,您将主题用作“mytopic”,在KafkaProducer类中,您将发送关于主题“sample”的消息。你能检查一下吗?现在更新了吗?你能再检查一次吗?试着在卡夫卡页面中生成新的MSG给卡夫卡发送消息在sparkTry中读取getting empty set时这不是问题,在你的producer类中使用它而不是从文件中读取。这是测试用的。随机=新随机();虽然(true){kafka(“Test-”+random.nextInt(100));Thread.sleep(500);}}请同时检查它在SparkStringConsumer类中解析StringDecoder.class的位置。应该是import kafka.serializer.StringDecoder;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.streaming.Duration;
import org.apache.spark.streaming.api.java.JavaStreamingContext;
public class SparkStringConsumer {
public static void main(String[] args) {
SparkConf conf = new SparkConf()
.setAppName("kafka-sandbox")
.setMaster("local[*]");
JavaSparkContext sc = new JavaSparkContext(conf);
JavaStreamingContext ssc = new JavaStreamingContext(sc, new Duration(2000));
Map<String, String> kafkaParams = new HashMap<>();
kafkaParams.put("metadata.broker.list", "localhost:9092");
Set<String> topics = Collections.singleton("sample");
JavaPairInputDStream<String, String> directKafkaStream = KafkaUtils.createDirectStream(ssc,
String.class, String.class, StringDecoder.class, StringDecoder.class, kafkaParams, topics);
directKafkaStream.foreachRDD(rdd -> {
System.out.println("--- New RDD with " + rdd.partitions().size()
+ " partitions and " + rdd.count() + " records");
rdd.foreach(record -> System.out.println(record._2));
});
ssc.start();
ssc.awaitTermination();
}
}
./spark-submit --class org.apache.spark_streaming.Spark_Kafka_Streaming.SparkStringConsumer --master local[4] Spark_Kafka_Streaming-0.0.1-SNAPSHOT.jar