package de.juplo.kafka;
+import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
-import org.apache.kafka.clients.consumer.ConsumerRecord;
-import org.apache.kafka.clients.consumer.ConsumerRecords;
-import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.errors.WakeupException;
-import org.apache.kafka.common.serialization.StringDeserializer;
import javax.annotation.PreDestroy;
import java.time.Duration;
@Slf4j
+@RequiredArgsConstructor
public class EndlessConsumer implements Runnable
{
private final ExecutorService executor;
- private final String bootstrapServer;
- private final String groupId;
private final String id;
private final String topic;
- private final String autoOffsetReset;
+ private final Consumer<String, String> consumer;
private final Lock lock = new ReentrantLock();
private final Condition condition = lock.newCondition();
private boolean running = false;
private Exception exception;
private long consumed = 0;
- private KafkaConsumer<String, String> consumer = null;
+ private final Map<Integer, Map<String, Long>> seen = new HashMap<>();
+ private final Map<Integer, Long> offsets = new HashMap<>();
- private final Map<Integer, Map<String, Integer>> seen = new HashMap<>();
-
-
- public EndlessConsumer(
- ExecutorService executor,
- String bootstrapServer,
- String groupId,
- String clientId,
- String topic,
- String autoOffsetReset)
- {
- this.executor = executor;
- this.bootstrapServer = bootstrapServer;
- this.groupId = groupId;
- this.id = clientId;
- this.topic = topic;
- this.autoOffsetReset = autoOffsetReset;
- }
@Override
public void run()
{
try
{
- Properties props = new Properties();
- props.put("bootstrap.servers", bootstrapServer);
- props.put("group.id", groupId);
- props.put("client.id", id);
- props.put("auto.offset.reset", autoOffsetReset);
- props.put("metadata.max.age.ms", "1000");
- props.put("key.deserializer", StringDeserializer.class.getName());
- props.put("value.deserializer", StringDeserializer.class.getName());
-
- this.consumer = new KafkaConsumer<>(props);
-
log.info("{} - Subscribing to topic {}", id, topic);
consumer.subscribe(Arrays.asList(topic), new ConsumerRebalanceListener()
{
{
partitions.forEach(tp ->
{
- log.info("{} - removing partition: {}", id, tp);
- Map<String, Integer> removed = seen.remove(tp.partition());
+ Integer partition = tp.partition();
+ Long newOffset = consumer.position(tp);
+ Long oldOffset = offsets.remove(partition);
+ log.info(
+ "{} - removing partition: {}, consumed {} records (offset {} -> {})",
+ id,
+ partition,
+ newOffset - oldOffset,
+ oldOffset,
+ newOffset);
+ Map<String, Long> removed = seen.remove(partition);
for (String key : removed.keySet())
{
log.info(
"{} - Seen {} messages for partition={}|key={}",
id,
removed.get(key),
- tp.partition(),
+ partition,
key);
}
});
{
partitions.forEach(tp ->
{
- log.info("{} - adding partition: {}", id, tp);
- seen.put(tp.partition(), new HashMap<>());
+ Integer partition = tp.partition();
+ Long offset = consumer.position(tp);
+ log.info("{} - adding partition: {}, offset={}", id, partition, offset);
+ offsets.put(partition, offset);
+ seen.put(partition, new HashMap<>());
});
}
});
Integer partition = record.partition();
String key = record.key() == null ? "NULL" : record.key();
- Map<String, Integer> byKey = seen.get(partition);
+ Map<String, Long> byKey = seen.get(partition);
if (!byKey.containsKey(key))
- byKey.put(key, 0);
+ byKey.put(key, 0l);
- int seenByKey = byKey.get(key);
+ long seenByKey = byKey.get(key);
seenByKey++;
byKey.put(key, seenByKey);
}
}
catch(WakeupException e)
{
- log.info("{} - RIIING!", id);
+ log.info("{} - RIIING! Request to stop consumption - commiting current offsets!", id);
+ consumer.commitSync();
shutdown();
}
catch(Exception e)
}
finally
{
- log.info("{} - Closing the KafkaConsumer", id);
- consumer.close();
log.info("{} - Consumer-Thread exiting", id);
}
}
lock.lock();
try
{
- running = false;
- exception = e;
- condition.signal();
+ try
+ {
+ log.info("{} - Unsubscribing from topic {}", id, topic);
+ consumer.unsubscribe();
+ }
+ catch (Exception ue)
+ {
+ log.error(
+ "{} - Error while unsubscribing from topic {}: {}",
+ id,
+ topic,
+ ue.toString());
+ }
+ finally
+ {
+ running = false;
+ exception = e;
+ condition.signal();
+ }
}
finally
{
}
}
- public Map<Integer, Map<String, Integer>> getSeen()
+ public Map<Integer, Map<String, Long>> getSeen()
{
return seen;
}