junrao commented on code in PR #14406:
URL: https://github.com/apache/kafka/pull/14406#discussion_r1367562895
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/PrototypeAsyncConsumer.java:
##########
@@ -639,56 +835,175 @@ 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 = collectFetch();
+ if (!fetch.isEmpty()) {
+ return fetch;
+ }
+
+ // We do not want to be stuck blocking in poll if we are missing some
positions
+ // since the offset lookup may be backing off after a failure
+
+ // NOTE: the use of cachedSubscriptionHasAllFetchPositions means we
MUST call
+ // updateAssignmentMetadataIfNeeded before this method.
+ if (!cachedSubscriptionHasAllFetchPositions && pollTimeout >
retryBackoffMs) {
+ pollTimeout = retryBackoffMs;
+ }
+
+ log.trace("Polling for fetches with timeout {}", pollTimeout);
+
+ Timer pollTimer = time.timer(pollTimeout);
- clusterResourceListeners.maybeAdd(keyDeserializer);
- clusterResourceListeners.maybeAdd(valueDeserializer);
- return clusterResourceListeners;
+ // Wait a bit for some fetched data to arrive, as there may not be
anything immediately available. Note the
+ // use of a shorter, dedicated "pollTimer" here which updates "timer"
so that calling method (poll) will
+ // correctly handle the overall timeout.
+ try {
+ fetchBuffer.awaitNotEmpty(pollTimer);
+ } catch (InterruptException e) {
+ log.trace("Timeout during fetch", e);
+ } finally {
+ timer.update(pollTimer.currentTimeMs());
+ }
+
+ return collectFetch();
Review Comment:
Thanks for the explanation, Kirk. We can just leave the code as it is then.
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