package de.juplo.kafka;
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.common.TopicPartition;
import org.apache.kafka.common.errors.WakeupException;
import org.apache.kafka.common.serialization.StringDeserializer;
import javax.annotation.PreDestroy;
import java.time.Duration;
-import java.util.Arrays;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Properties;
+import java.util.*;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
private KafkaConsumer<String, String> consumer = null;
private Future<?> future = null;
- private Map<Integer, Map<String, Integer>> seen;
+ private final Map<TopicPartition, PartitionStatistics> seen = new HashMap<>();
public EndlessConsumer(
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));
+ consumer.subscribe(Arrays.asList(topic), new ConsumerRebalanceListener()
+ {
+ @Override
+ public void onPartitionsRevoked(Collection<TopicPartition> partitions)
+ {
+ partitions.forEach(tp ->
+ {
+ log.info("{} - removing partition: {}", id, tp);
+ PartitionStatistics removed = seen.remove(tp);
+ for (KeyCounter counter : removed.getStatistics())
+ {
+ log.info(
+ "{} - Seen {} messages for partition={}|key={}",
+ id,
+ counter.getCounter(),
+ removed.getPartition(),
+ counter.getKey());
+ }
+ });
+ }
- seen = new HashMap<>();
+ @Override
+ public void onPartitionsAssigned(Collection<TopicPartition> partitions)
+ {
+ partitions.forEach(tp ->
+ {
+ log.info("{} - adding partition: {}", id, tp);
+ seen.put(tp, new PartitionStatistics(tp));
+ });
+ }
+ });
while (true)
{
record.value()
);
- Integer partition = record.partition();
- String key = record.key();
-
- if (!seen.containsKey(partition))
- seen.put(partition, new HashMap<>());
-
- Map<String, Integer> byKey = seen.get(partition);
-
- if (!byKey.containsKey(key))
- byKey.put(key, 0);
-
- int seenByKey = byKey.get(key);
- seenByKey++;
- byKey.put(key, seenByKey);
+ TopicPartition partition = new TopicPartition(record.topic(), record.partition());
+ String key = record.key() == null ? "NULL" : record.key();
+ seen.get(partition).increment(key);
}
}
}
{
log.info("{} - Closing the KafkaConsumer", id);
consumer.close();
-
- for (Integer partition : seen.keySet())
- {
- Map<String, Integer> byKey = seen.get(partition);
- for (String key : byKey.keySet())
- {
- log.info(
- "{} - Seen {} messages for partition={}|key={}",
- id,
- byKey.get(key),
- partition,
- key);
- }
- }
- seen = null;
-
log.info("{} - Consumer-Thread exiting", id);
}
}
- public Map<Integer, Map<String, Integer>> getSeen()
+ public Map<TopicPartition, PartitionStatistics> getSeen()
{
return seen;
}