1 import config.Configuration;
2 import org.apache.hadoop.fs.FSDataOutputStream;
3 import org.apache.hadoop.fs.FileSystem;
4 import org.apache.kafka.clients.consumer.ConsumerConfig;
5 import org.apache.kafka.clients.consumer.ConsumerRecord;
6 import org.apache.kafka.clients.consumer.ConsumerRecords;
7 import org.apache.kafka.clients.consumer.KafkaConsumer;
9 import org.slf4j.Logger;
10 import org.slf4j.LoggerFactory;
12 import java.io.IOException;
15 public class CreateKafkaConsumer {
18 private static Logger log = LoggerFactory.getLogger(CreateKafkaConsumer.class);
20 private final String BOOTSTRAP_SERVERS = (String) Configuration.getSettings().get("kafka").get("bootStrapServers");
21 private final String GROUP_ID_CONFIG = (String) Configuration.getSettings().get("kafka").get("group_id");
22 private final String KEY_DESERIALIZER = (String) Configuration.getSettings().get("kafka").get("key_deserialize_class");
23 private final String VAL_DESERIALIZER = (String) Configuration.getSettings().get("kafka").get("value_deserialize_class");
24 private final String KAFKA_TOPIC = (String) Configuration.getSettings().get("kafka").get("topic");
26 private final String HDFS_URL= (String) Configuration.getSettings().get("hdfs").get("hdfsURL");
27 private final String HDFS_REMOTE_FILE = (String) Configuration.getSettings().get("hdfs").get("hdfs_remote_file");
29 private KafkaConsumer<String, String> kafkaConsumer;
30 private Properties properties = new Properties();
31 private HdfsWriter hdfsWriter;
32 private FileSystem hdfsFileSystem;
36 public CreateKafkaConsumer() throws IOException{
38 kafkaConsumer = new KafkaConsumer<>(properties);
39 kafkaConsumer.subscribe(Collections.singletonList(KAFKA_TOPIC));
40 hdfsWriter = new HdfsWriter();
41 hdfsFileSystem = hdfsWriter.createHdfsFileSystem(HDFS_URL);
42 log.info(":::Created kafkaConsumer:::");
45 private void setKafkaProperties(){
47 properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);
48 properties.put(ConsumerConfig.GROUP_ID_CONFIG, GROUP_ID_CONFIG);
49 properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, KEY_DESERIALIZER);
50 properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, VAL_DESERIALIZER);
51 log.info(":::Set kafka properties:::");
55 public void processKafkaMessage() throws IOException{
58 ConsumerRecords<String, String> recordsPerPartition = kafkaConsumer.poll(100000);
59 if(recordsPerPartition.isEmpty())
60 log.info(":::recordsPerPartition is NULL:::");
62 log.info(":::size of recordsPerPartition: "+recordsPerPartition.count()+" :::");
64 for(ConsumerRecord<String, String> record:recordsPerPartition){
65 log.info("Topic: "+record.topic());
66 log.info("partition: "+record.partition());
67 log.info("ReceivedKey: "+record.key()+" ReceivedValue: "+record.value());
68 FSDataOutputStream fsDataOutputStream = hdfsWriter.invokeHdfsWriter(hdfsFileSystem, HDFS_REMOTE_FILE);
69 hdfsWriter.writeMessageToHdfs(fsDataOutputStream, record.value());
70 fsDataOutputStream.close();
77 log.info(":::Closing kafkaConsumer:::");
78 kafkaConsumer.close();