kirktrue commented on code in PR #14406:
URL: https://github.com/apache/kafka/pull/14406#discussion_r1358990414
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/events/ApplicationEventProcessor.java:
##########
@@ -17,146 +17,195 @@
package org.apache.kafka.clients.consumer.internals.events;
import org.apache.kafka.clients.consumer.OffsetAndTimestamp;
+import org.apache.kafka.clients.consumer.internals.CachedSupplier;
import org.apache.kafka.clients.consumer.internals.CommitRequestManager;
import org.apache.kafka.clients.consumer.internals.ConsumerMetadata;
+import org.apache.kafka.clients.consumer.internals.ConsumerNetworkThread;
import org.apache.kafka.clients.consumer.internals.RequestManagers;
import org.apache.kafka.common.KafkaException;
import org.apache.kafka.common.PartitionInfo;
import org.apache.kafka.common.TopicPartition;
+import org.apache.kafka.common.utils.LogContext;
import java.util.List;
import java.util.Map;
-import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CompletableFuture;
+import java.util.function.Supplier;
-public class ApplicationEventProcessor {
-
- private final BlockingQueue<BackgroundEvent> backgroundEventQueue;
+/**
+ * An {@link EventProcessor} that is created and executes in the {@link
ConsumerNetworkThread network thread}
+ * which processes {@link ApplicationEvent application events} generated by
the application thread.
+ */
+public class ApplicationEventProcessor extends
EventProcessor<ApplicationEvent> {
private final ConsumerMetadata metadata;
-
private final RequestManagers requestManagers;
- public ApplicationEventProcessor(final BlockingQueue<BackgroundEvent>
backgroundEventQueue,
+ public ApplicationEventProcessor(final LogContext logContext,
+ final BlockingQueue<ApplicationEvent>
applicationEventQueue,
final RequestManagers requestManagers,
final ConsumerMetadata metadata) {
- this.backgroundEventQueue = backgroundEventQueue;
+ super(logContext, applicationEventQueue);
this.requestManagers = requestManagers;
this.metadata = metadata;
}
- public boolean process(final ApplicationEvent event) {
- Objects.requireNonNull(event);
+ /**
+ * Process the events—if any—that were produced by the application thread.
It is possible that when processing
+ * an event generates an error. In such cases, the processor will
immediately throw an exception, and not
+ * process the remaining events.
+ */
+ @Override
+ public void process() {
+ process(error -> {
+ throw error;
+ });
+ }
+
+ @Override
+ public void process(ApplicationEvent event) {
switch (event.type()) {
- case NOOP:
- return process((NoopApplicationEvent) event);
case COMMIT:
- return process((CommitApplicationEvent) event);
+ process((CommitApplicationEvent) event);
+ return;
+
case POLL:
- return process((PollApplicationEvent) event);
+ process((PollApplicationEvent) event);
+ return;
+
case FETCH_COMMITTED_OFFSET:
- return process((OffsetFetchApplicationEvent) event);
+ process((OffsetFetchApplicationEvent) event);
+ return;
+
case METADATA_UPDATE:
- return process((NewTopicsMetadataUpdateRequestEvent) event);
+ process((NewTopicsMetadataUpdateRequestEvent) event);
+ return;
+
case ASSIGNMENT_CHANGE:
- return process((AssignmentChangeApplicationEvent) event);
+ process((AssignmentChangeApplicationEvent) event);
+ return;
+
case TOPIC_METADATA:
- return process((TopicMetadataApplicationEvent) event);
+ process((TopicMetadataApplicationEvent) event);
+ return;
+
case LIST_OFFSETS:
- return process((ListOffsetsApplicationEvent) event);
+ process((ListOffsetsApplicationEvent) event);
+ return;
+
+ case FETCH:
+ process((FetchEvent) event);
+ return;
+
case RESET_POSITIONS:
- return processResetPositionsEvent();
+ processResetPositionsEvent();
+ return;
+
case VALIDATE_POSITIONS:
- return processValidatePositionsEvent();
+ processValidatePositionsEvent();
+ return;
+
+ default:
+ throw new IllegalArgumentException("Application event type " +
event.type() + " was not expected");
}
- return false;
}
- /**
- * Processes {@link NoopApplicationEvent} and enqueue a
- * {@link NoopBackgroundEvent}. This is intentionally left here for
- * demonstration purpose.
- *
- * @param event a {@link NoopApplicationEvent}
- */
- private boolean process(final NoopApplicationEvent event) {
- return backgroundEventQueue.add(new
NoopBackgroundEvent(event.message()));
+ @Override
+ protected Class<ApplicationEvent> getEventClass() {
+ return ApplicationEvent.class;
}
- private boolean process(final PollApplicationEvent event) {
+ private void process(final PollApplicationEvent event) {
if (!requestManagers.commitRequestManager.isPresent()) {
- return true;
+ return;
}
CommitRequestManager manager =
requestManagers.commitRequestManager.get();
manager.updateAutoCommitTimer(event.pollTimeMs());
- return true;
}
- private boolean process(final CommitApplicationEvent event) {
+ private void process(final CommitApplicationEvent event) {
if (!requestManagers.commitRequestManager.isPresent()) {
// Leaving this error handling here, but it is a bit strange as
the commit API should enforce the group.id
- // upfront so we should never get to this block.
+ // upfront, so we should never get to this block.
Exception exception = new KafkaException("Unable to commit offset.
Most likely because the group.id wasn't set");
event.future().completeExceptionally(exception);
- return false;
+ return;
}
CommitRequestManager manager =
requestManagers.commitRequestManager.get();
event.chain(manager.addOffsetCommitRequest(event.offsets()));
- return true;
}
- private boolean process(final OffsetFetchApplicationEvent event) {
+ private void process(final OffsetFetchApplicationEvent event) {
if (!requestManagers.commitRequestManager.isPresent()) {
event.future().completeExceptionally(new KafkaException("Unable to
fetch committed " +
"offset because the CommittedRequestManager is not
available. Check if group.id was set correctly"));
- return false;
+ return;
}
CommitRequestManager manager =
requestManagers.commitRequestManager.get();
event.chain(manager.addOffsetFetchRequest(event.partitions()));
- return true;
}
- private boolean process(final NewTopicsMetadataUpdateRequestEvent event) {
+ private void process(final NewTopicsMetadataUpdateRequestEvent ignored) {
metadata.requestUpdateForNewTopics();
- return true;
}
- private boolean process(final AssignmentChangeApplicationEvent event) {
+ private void process(final AssignmentChangeApplicationEvent event) {
if (!requestManagers.commitRequestManager.isPresent()) {
- return false;
+ return;
}
CommitRequestManager manager =
requestManagers.commitRequestManager.get();
manager.updateAutoCommitTimer(event.currentTimeMs());
manager.maybeAutoCommit(event.offsets());
- return true;
}
- private boolean process(final ListOffsetsApplicationEvent event) {
+ private void process(final ListOffsetsApplicationEvent event) {
final CompletableFuture<Map<TopicPartition, OffsetAndTimestamp>>
future =
requestManagers.offsetsRequestManager.fetchOffsets(event.timestampsToSearch(),
event.requireTimestamps());
event.chain(future);
- return true;
}
- private boolean processResetPositionsEvent() {
+ private void processResetPositionsEvent() {
requestManagers.offsetsRequestManager.resetPositionsIfNeeded();
- return true;
}
- private boolean processValidatePositionsEvent() {
+ private void processValidatePositionsEvent() {
requestManagers.offsetsRequestManager.validatePositionsIfNeeded();
- return true;
}
- private boolean process(final TopicMetadataApplicationEvent event) {
+ private void process(final TopicMetadataApplicationEvent event) {
final CompletableFuture<Map<String, List<PartitionInfo>>> future =
-
this.requestManagers.topicMetadataRequestManager.requestTopicMetadata(Optional.of(event.topic()));
+
this.requestManagers.topicMetadataRequestManager.requestTopicMetadata(Optional.of(event.topic()));
event.chain(future);
- return true;
+ }
+
+ private void process(final FetchEvent event) {
Review Comment:
Done.
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/PrototypeAsyncConsumer.java:
##########
@@ -621,56 +825,163 @@ 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);
+ /**
+ * Send the requests for fetch data to the {@link ConsumerNetworkThread
network thread} and set up to
+ * collect the results in {@link #fetchBuffer}.
+ */
+ private void sendFetches() {
+ FetchEvent event = new FetchEvent();
+ applicationEventHandler.add(event);
Review Comment:
Done.
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