아파치 카프카_애플리케이션 프로그래밍 with 자바 도서 요약

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--topic hello.kafka
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$ bin/kafka-topics.sh
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--partitions 3
--replication-factor 1
--config retention.ms=172800000
--topic hello.kafka.2
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--topic hello.kafka
--alter
--partitions 4
$ bin/kafka-configs.sh --bootstrap-server localhost:9092
--entity-type topics
--entity-name hello.kafka
--alter --add-config retention.ms=86400000
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--topic hello.kafka
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--topic hello.kafka
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--topic hello.kafka
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--group hello-group
--from-beginning
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--topic verify-test
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--topic verify-test
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vi delete-topic.json
{"partitions": [{"topic": "hello.kafka", "partition": 0, "offset": 50}], "version": 1}
$ bin/kafka-delete-records.sh --bootstrap-server localhost:9092
--offset-json-file delete-topic.json
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$ ls /tmp/kafka-logs
drwxr-xr-x 6 macbookpro wheel 192 5 13 20:16 hello.kafka-0
drwxr-xr-x 6 macbookpro wheel 192 5 13 20:17 hello.kafka.2-0
drwxr-xr-x 6 macbookpro wheel 192 5 13 20:17 hello.kafka.2-1
drwxr-xr-x 6 macbookpro wheel 192 5 13 20:17 hello.kafka.2-2
$ ls /tmp/kafka-logs/hello.kafka-0
macbookpro /tmp/kafka-logs ls hello.kafka-0
00000000000000000000.index 00000000000000000000.timeindex
00000000000000000000.log leader-epoch-checkpoint
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37. ?:
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$ bin/zookeeper-shell.sh localhost:2181
Connecting to localhost:2181
Welcome to ZooKeeper!
ls /
[admin, brokers, cluster, config, consumers, controller, controller_epoch, isr_change_notification, latest_pro
ducer_id_block, log_dir_event_notification, zookeeper]
get /brokers/ids/0
{"listener_security_protocol_map":{"PLAINTEXT":"PLAINTEXT"},"endpoints":["PLAINTEXT://localhost:9092"],"jmx_po
rt":-1,"port":9092,"host":"localhost","version":4,"timestamp":"1620904358029"}
get /controller
{"version":1,"brokerid":0,"timestamp":"1620904358147"}
ls /brokers/topics
[hello.kafka, hello.kafka.2]
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public class SimpleProducer {
private final static Logger logger = LoggerFactory.getLogger(SimpleProducer.class);
private final static String TOPIC_NAME = "test";
private final static String BOOTSTRAP_SERVERS = "my-kafka:9092";
public static void main(String[] args) {
Properties configs = new Properties();
configs.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);
configs.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
configs.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
KafkaProducer<String, String> producer = new KafkaProducer<>(configs);
String messageValue = "testMessage";
ProducerRecord<String, String> record = new ProducerRecord<>(TOPIC_NAME, messageValue);
producer.send(record);
logger.info("{}", record);
producer.flush();
producer.close();
}
}
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public class ProducerWithKeyValue {
private final static Logger logger = LoggerFactory.getLogger(ProducerWithKeyValue.class);
private final static String TOPIC_NAME = "test";
private final static String BOOTSTRAP_SERVERS = "my-kafka:9092";
public static void main(String[] args) {
Properties configs = new Properties();
configs.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);
configs.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
configs.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
KafkaProducer<String, String> producer = new KafkaProducer<>(configs);
ProducerRecord<String, String> record = new ProducerRecord<>(TOPIC_NAME, "Pangyo", "23");
producer.send(record);
ProducerRecord<String, String> record = new ProducerRecord<>(TOPIC_NAME, "Busan", "21");
producer.send(record);
producer.flush();
producer.close();
}
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public class CustomPartitioner implements Partitioner {
@Override
public int partition(String topic, Object key, byte[] keyBytes, Object value, byte[] valueBytes,
Cluster cluster) {
if (keyBytes == null) {
throw new InvalidRecordException("Need message key");
}
if (((String)key).equals("Pangyo"))
return 0;
List<PartitionInfo> partitions = cluster.partitionsForTopic(topic);
int numPartitions = partitions.size();
return Utils.toPositive(Utils.murmur2(keyBytes)) % numPartitions;
}
@Override
public void configure(Map<String, ?> configs) {}
@Override
public void close() {}
}
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public class ProducerWithAsyncCallback {
private final static String TOPIC_NAME = "test";
private final static String BOOTSTRAP_SERVERS = "my-kafka:9092";
public static void main(String[] args) {
Properties configs = new Properties();
configs.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);
configs.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
configs.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
KafkaProducer<String, String> producer = new KafkaProducer<>(configs);
ProducerRecord<String, String> record = new ProducerRecord<>(TOPIC_NAME, "Pangyo", "23");
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private final static Logger logger = LoggerFactory.getLogger(SimpleConsumer.class);
private final static String TOPIC_NAME = "test";
private final static String BOOTSTRAP_SERVERS = "my-kafka:9092";
private final static String GROUP_ID = "test-group";
public static void main(String[] args) {
Properties configs = new Properties();
configs.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);
configs.put(ConsumerConfig.GROUP_ID_CONFIG, GROUP_ID);
configs.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
configs.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(configs);
consumer.subscribe(Arrays.asList(TOPIC_NAME));
while (true) {
ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(1));
for (ConsumerRecord<String, String> record : records) {
logger.info("record:{}", record);
}
}
}
}
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public class ConsumerWithASyncCommit {
private final static Logger logger = LoggerFactory.getLogger(ConsumerWithASyncCommit.class);
private final static String TOPIC_NAME = "test";
private final static String BOOTSTRAP_SERVERS = "my-kafka:9092";
private final static String GROUP_ID = "test-group";
public static void main(String[] args) {
Properties configs = new Properties();
configs.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);
configs.put(ConsumerConfig.GROUP_ID_CONFIG, GROUP_ID);
configs.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
configs.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
configs.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
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consumer.subscribe(Arrays.asList(TOPIC_NAME));
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logger.info("record:{}", record);
}
consumer.commitAsync(new OffsetCommitCallback() {
public void onComplete(Map<TopicPartition, OffsetAndMetadata> offsets, Exception e) {
if (e != null)
System.err.println("Commit failed");
else
System.out.println("Commit succeeded");
if (e != null)
logger.error("Commit failed for offsets {}", offsets, e);
}
});
}
}
}
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public class SpringProducerApplication implements CommandLineRunner {
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private KafkaTemplate<Integer, String> template;
public static void main(String[] args) {
SpringApplication application = new SpringApplication(SpringProducerApplication.class);
application.run(args);
}
@Override
public void run(String... args) {
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