import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.consumer.Consumer;
-import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
import org.apache.kafka.common.TopicPartition;
-import java.time.Clock;
-import java.time.Duration;
-import java.time.Instant;
import java.util.*;
-import java.util.concurrent.CountDownLatch;
@RequiredArgsConstructor
@Slf4j
-public class ApplicationRebalanceListener implements ConsumerRebalanceListener
+public class ApplicationRebalanceListener implements RebalanceListener
{
- private final Consumer consumer;
private final ApplicationRecordHandler recordHandler;
private final AdderResults adderResults;
private final StateRepository stateRepository;
private final String id;
+ private final String topic;
+ private final Consumer consumer;
private final Set<Integer> partitions = new HashSet<>();
stateRepository
.findById(Integer.toString(partition))
.orElse(new StateDocument(partition));
+ if (document.offset >= 0)
+ {
+ // Only seek, if a stored offset was found
+ // Otherwise: Use initial offset, generated by Kafka
+ consumer.seek(tp, document.offset);
+ log.info(
+ "{} - Seeking to offset {} for partition {}",
+ id,
+ document.offset,
+ partition);
+ }
recordHandler.addPartition(partition, document.state);
for (String user : document.state.keySet())
{
@Override
public void onPartitionsRevoked(Collection<TopicPartition> partitions)
{
- log.info("{} - Commiting offsets for all previously assigned partitions", id);
- CountDownLatch commitDone = new CountDownLatch(1);
- consumer.commitAsync((offsets, e) ->
- {
- commitDone.countDown();
- if (e == null)
- {
- log.error("{} - Could not commit offsets to Kafka!", id, e);
- }
- else
- {
- offsets.entrySet().stream().forEach(entry ->
- {
- log.info("{} - Commited offset for {}: {}", id, entry.getKey(), entry.getValue());
- });
- }
- });
-
partitions.forEach(tp ->
{
Integer partition = tp.partition();
log.info("{} - removing partition: {}", id, partition);
this.partitions.remove(partition);
Map<String, AdderResult> state = recordHandler.removePartition(partition);
+ Long offset = consumer.position(tp);
+ log.info(
+ "{} - offset of next unseen message for partition {} is {}",
+ id,
+ partition,
+ offset);
for (String user : state.keySet())
{
log.info(
state.get(user));
}
Map<String, List<AdderResult>> results = adderResults.removePartition(partition);
- stateRepository.save(new StateDocument(partition, state, results));
+ stateRepository.save(new StateDocument(partition, state, results, offset));
});
-
- try
- {
- log.debug("{} - Waiting for async commit to complete", id);
- commitDone.await();
- }
- catch (InterruptedException e)
- {
- log.warn(
- "{} - Interrupted while waiting for async commit in onPartitionsRevoked({})",
- id,
- partitions,
- e);
- }
}
}