kirktrue commented on code in PR #14406: URL: https://github.com/apache/kafka/pull/14406#discussion_r1367508628
########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/PrototypeAsyncConsumer.java: ########## @@ -633,56 +832,159 @@ public void assign(Collection<TopicPartition> partitions) { throw new IllegalArgumentException("Topic partitions to assign to cannot have null or empty topic"); } - // TODO: implementation of refactored Fetcher will be included in forthcoming commits. - // fetcher.clearBufferedDataForUnassignedPartitions(partitions); + // Clear the buffered data which are not a part of newly assigned topics + final Set<TopicPartition> currentTopicPartitions = new HashSet<>(); + + for (TopicPartition tp : subscriptions.assignedPartitions()) { + if (partitions.contains(tp)) + currentTopicPartitions.add(tp); + } + + fetchBuffer.retainAll(currentTopicPartitions); // assignment change event will trigger autocommit if it is configured and the group id is specified. This is // to make sure offsets of topic partitions the consumer is unsubscribing from are committed since there will - // be no following rebalance - eventHandler.add(new AssignmentChangeApplicationEvent(this.subscriptions.allConsumed(), time.milliseconds())); + // be no following rebalance. + // + // See the ApplicationEventProcessor.process() method that handles this event for more detail. + applicationEventHandler.add(new AssignmentChangeApplicationEvent(subscriptions.allConsumed(), time.milliseconds())); log.info("Assigned to partition(s): {}", join(partitions, ", ")); - if (this.subscriptions.assignFromUser(new HashSet<>(partitions))) - eventHandler.add(new NewTopicsMetadataUpdateRequestEvent()); + if (subscriptions.assignFromUser(new HashSet<>(partitions))) + applicationEventHandler.add(new NewTopicsMetadataUpdateRequestEvent()); } @Override - public void subscribe(Pattern pattern, ConsumerRebalanceListener callback) { - throw new KafkaException("method not implemented"); + public void subscribe(Pattern pattern, ConsumerRebalanceListener listener) { + maybeThrowInvalidGroupIdException(); + if (pattern == null || pattern.toString().isEmpty()) + throw new IllegalArgumentException("Topic pattern to subscribe to cannot be " + (pattern == null ? + "null" : "empty")); + + throwIfNoAssignorsConfigured(); + log.info("Subscribed to pattern: '{}'", pattern); + subscriptions.subscribe(pattern, listener); + updatePatternSubscription(metadata.fetch()); + metadata.requestUpdateForNewTopics(); + } + + /** + * TODO: remove this when we implement the KIP-848 protocol. + * + * <p> + * The contents of this method are shamelessly stolen from + * {@link ConsumerCoordinator#updatePatternSubscription(Cluster)} and are used here because we won't have access + * to a {@link ConsumerCoordinator} in this code. Perhaps it could be moved to a ConsumerUtils class? + * + * @param cluster Cluster from which we get the topics + */ + private void updatePatternSubscription(Cluster cluster) { + final Set<String> topicsToSubscribe = cluster.topics().stream() + .filter(subscriptions::matchesSubscribedPattern) + .collect(Collectors.toSet()); + if (subscriptions.subscribeFromPattern(topicsToSubscribe)) + metadata.requestUpdateForNewTopics(); } @Override public void subscribe(Pattern pattern) { - throw new KafkaException("method not implemented"); + subscribe(pattern, new NoOpConsumerRebalanceListener()); } @Override public void unsubscribe() { - throw new KafkaException("method not implemented"); + fetchBuffer.retainAll(Collections.emptySet()); + subscriptions.unsubscribe(); } @Override @Deprecated - public ConsumerRecords<K, V> poll(long timeout) { - throw new KafkaException("method not implemented"); + public ConsumerRecords<K, V> poll(final long timeoutMs) { + return poll(Duration.ofMillis(timeoutMs)); } // Visible for testing WakeupTrigger wakeupTrigger() { return wakeupTrigger; } - private static <K, V> ClusterResourceListeners configureClusterResourceListeners( - final Deserializer<K> keyDeserializer, - final Deserializer<V> valueDeserializer, - final List<?>... candidateLists) { - ClusterResourceListeners clusterResourceListeners = new ClusterResourceListeners(); - for (List<?> candidateList: candidateLists) - clusterResourceListeners.maybeAddAll(candidateList); + private Fetch<K, V> pollForFetches(Timer timer) { + long pollTimeout = timer.remainingMs(); + + // if data is available already, return it immediately + final Fetch<K, V> fetch = fetchCollector.collectFetch(fetchBuffer); + if (!fetch.isEmpty()) { + return fetch; + } + + // Wake up the network thread to send any new fetches (won't resend pending fetches) + applicationEventHandler.wakeup(); Review Comment: Done. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org