import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.common.TopicPartition;
import java.time.Clock;
@RequiredArgsConstructor
@Slf4j
-public class ApplicationRebalanceListener implements PollIntervalAwareConsumerRebalanceListener
+public class ApplicationRebalanceListener implements RebalanceListener
{
private final ApplicationRecordHandler recordHandler;
private final AdderResults adderResults;
private final StateRepository stateRepository;
private final String id;
+ private final String topic;
private final Clock clock;
private final Duration commitInterval;
+ private final Consumer consumer;
private final Set<Integer> partitions = new HashSet<>();
private Instant lastCommit = Instant.EPOCH;
+ private boolean commitsEnabled = true;
@Override
public void onPartitionsAssigned(Collection<TopicPartition> partitions)
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())
+ {
+ log.info(
+ "{} - Restored state for partition={}|user={}: {}",
+ id,
+ partition,
+ user,
+ document.state.get(user));
+ }
adderResults.addPartition(partition, document.results);
});
}
Integer partition = tp.partition();
log.info("{} - removing partition: {}", id, partition);
this.partitions.remove(partition);
- Map<String, AdderResult> state = recordHandler.removePartition(partition);
- for (String user : state.keySet())
+ if (commitsEnabled)
{
+ Map<String, AdderResult> state = recordHandler.removePartition(partition);
+ Long offset = consumer.position(tp);
log.info(
- "{} - Calculations for partition={}|user={}: {}",
+ "{} - offset of next unseen message for partition {} is {}",
id,
partition,
- user,
- state.get(user));
+ offset);
+ for (String user : state.keySet())
+ {
+ log.info(
+ "{} - Saved state for partition={}|user={}: {}",
+ id,
+ partition,
+ user,
+ state.get(user));
+ }
+ Map<String, List<AdderResult>> results = adderResults.removePartition(partition);
+ stateRepository.save(new StateDocument(partition, state, results, offset));
+ }
+ else
+ {
+ log.info("{} - Offset commits are disabled! Last commit: {}", id, lastCommit);
}
- Map<String, List<AdderResult>> results = adderResults.removePartition(partition);
- stateRepository.save(new StateDocument(partition, state, results));
});
}
@Override
public void beforeNextPoll()
{
+ if (!commitsEnabled)
+ {
+ log.info("{} - Offset commits are disabled! Last commit: {}", id, lastCommit);
+ return;
+ }
+
if (lastCommit.plus(commitInterval).isBefore(clock.instant()))
{
- log.debug("Storing data, last commit: {}", lastCommit);
- partitions.forEach(partition -> stateRepository.save(
- new StateDocument(
+ partitions
+ .stream()
+ .forEach(partition ->
+ {
+ log.info("{} - persisting state & offset for partition: {}", id, partition);
+ Map<String, AdderResult> state = recordHandler.getState(partition).getState();
+ Long offset = consumer.position(new TopicPartition(topic, partition));
+ log.info(
+ "{} - offset of next unseen message for partition {} is {}",
+ id,
+ partition,
+ offset);
+ for (String user : state.keySet())
+ {
+ log.info(
+ "{} - Saved state for partition={}|user={}: {}",
+ id,
partition,
- recordHandler.getState(partition).getState(),
- adderResults.getState(partition))));
+ user,
+ state.get(user));
+ }
+ Map<String, List<AdderResult>> results = adderResults.getState(partition);
+ stateRepository.save(new StateDocument(partition, state, results, offset));
+ });
+
lastCommit = clock.instant();
}
}
+
+ @Override
+ public void enableCommits()
+ {
+ commitsEnabled = true;
+ }
+
+ @Override
+ public void disableCommits()
+ {
+ commitsEnabled = false;
+ }
}