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import config.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.*;
public class CreateKafkaConsumer {
private static Logger log = LoggerFactory.getLogger(CreateKafkaConsumer.class);
private final String BOOTSTRAP_SERVERS = (String) Configuration.getSettings().get("kafka").get("bootStrapServers");
private final String GROUP_ID_CONFIG = (String) Configuration.getSettings().get("kafka").get("group_id");
private final String KEY_DESERIALIZER = (String) Configuration.getSettings().get("kafka").get("key_deserialize_class");
private final String VAL_DESERIALIZER = (String) Configuration.getSettings().get("kafka").get("value_deserialize_class");
private final String KAFKA_TOPIC = (String) Configuration.getSettings().get("kafka").get("topic");
private final String HDFS_URL= (String) Configuration.getSettings().get("hdfs").get("hdfsURL");
private final String HDFS_REMOTE_FILE = (String) Configuration.getSettings().get("hdfs").get("hdfs_remote_file");
private KafkaConsumer<String, String> kafkaConsumer;
private Properties properties = new Properties();
private HdfsWriter hdfsWriter;
private FileSystem hdfsFileSystem;
public CreateKafkaConsumer() throws IOException{
setKafkaProperties();
kafkaConsumer = new KafkaConsumer<>(properties);
kafkaConsumer.subscribe(Collections.singletonList(KAFKA_TOPIC));
hdfsWriter = new HdfsWriter();
hdfsFileSystem = hdfsWriter.createHdfsFileSystem(HDFS_URL);
log.info(":::Created kafkaConsumer:::");
}
private void setKafkaProperties(){
properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);
properties.put(ConsumerConfig.GROUP_ID_CONFIG, GROUP_ID_CONFIG);
properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, KEY_DESERIALIZER);
properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, VAL_DESERIALIZER);
log.info(":::Set kafka properties:::");
}
public void processKafkaMessage() throws IOException{
try{
while(true){
ConsumerRecords<String, String> recordsPerPartition = kafkaConsumer.poll(100000);
if(recordsPerPartition.isEmpty())
log.info(":::recordsPerPartition is NULL:::");
else
log.info(":::size of recordsPerPartition: "+recordsPerPartition.count()+" :::");
for(ConsumerRecord<String, String> record:recordsPerPartition){
log.info("Topic: "+record.topic());
log.info("partition: "+record.partition());
log.info("ReceivedKey: "+record.key()+" ReceivedValue: "+record.value());
FSDataOutputStream fsDataOutputStream = hdfsWriter.invokeHdfsWriter(hdfsFileSystem, HDFS_REMOTE_FILE);
hdfsWriter.writeMessageToHdfs(fsDataOutputStream, record.value());
fsDataOutputStream.close();
}
}
}
finally {
log.info(":::Closing kafkaConsumer:::");
kafkaConsumer.close();
}
}
}
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