kirktrue commented on code in PR #14670: URL: https://github.com/apache/kafka/pull/14670#discussion_r1385612995
########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/LegacyKafkaConsumer.java: ########## @@ -0,0 +1,2554 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.kafka.clients.consumer.internals; + +import org.apache.kafka.clients.ApiVersions; +import org.apache.kafka.clients.ClientUtils; +import org.apache.kafka.clients.CommonClientConfigs; +import org.apache.kafka.clients.GroupRebalanceConfig; +import org.apache.kafka.clients.Metadata; +import org.apache.kafka.clients.consumer.CommitFailedException; +import org.apache.kafka.clients.consumer.Consumer; +import org.apache.kafka.clients.consumer.ConsumerConfig; +import org.apache.kafka.clients.consumer.ConsumerGroupMetadata; +import org.apache.kafka.clients.consumer.ConsumerInterceptor; +import org.apache.kafka.clients.consumer.ConsumerPartitionAssignor; +import org.apache.kafka.clients.consumer.ConsumerRebalanceListener; +import org.apache.kafka.clients.consumer.ConsumerRecord; +import org.apache.kafka.clients.consumer.ConsumerRecords; +import org.apache.kafka.clients.consumer.KafkaConsumer; +import org.apache.kafka.clients.consumer.NoOffsetForPartitionException; +import org.apache.kafka.clients.consumer.OffsetAndMetadata; +import org.apache.kafka.clients.consumer.OffsetAndTimestamp; +import org.apache.kafka.clients.consumer.OffsetCommitCallback; +import org.apache.kafka.clients.consumer.OffsetResetStrategy; +import org.apache.kafka.common.Cluster; +import org.apache.kafka.common.IsolationLevel; +import org.apache.kafka.common.KafkaException; +import org.apache.kafka.common.Metric; +import org.apache.kafka.common.MetricName; +import org.apache.kafka.common.PartitionInfo; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.Uuid; +import org.apache.kafka.common.errors.InterruptException; +import org.apache.kafka.common.errors.InvalidGroupIdException; +import org.apache.kafka.common.errors.TimeoutException; +import org.apache.kafka.common.internals.ClusterResourceListeners; +import org.apache.kafka.common.metrics.Metrics; +import org.apache.kafka.common.serialization.Deserializer; +import org.apache.kafka.common.utils.AppInfoParser; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.common.utils.Time; +import org.apache.kafka.common.utils.Timer; +import org.slf4j.Logger; +import org.slf4j.event.Level; + +import java.net.InetSocketAddress; +import java.time.Duration; +import java.util.Arrays; +import java.util.Collection; +import java.util.Collections; +import java.util.ConcurrentModificationException; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; +import java.util.OptionalLong; +import java.util.Set; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.concurrent.atomic.AtomicLong; +import java.util.concurrent.atomic.AtomicReference; +import java.util.regex.Pattern; + +import static org.apache.kafka.clients.consumer.ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG; +import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.CONSUMER_JMX_PREFIX; +import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.CONSUMER_METRIC_GROUP_PREFIX; +import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.DEFAULT_CLOSE_TIMEOUT_MS; +import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.createConsumerNetworkClient; +import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.createFetchMetricsManager; +import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.createLogContext; +import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.createMetrics; +import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.createSubscriptionState; +import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.configuredConsumerInterceptors; +import static org.apache.kafka.common.utils.Utils.closeQuietly; +import static org.apache.kafka.common.utils.Utils.isBlank; +import static org.apache.kafka.common.utils.Utils.join; +import static org.apache.kafka.common.utils.Utils.swallow; + +/** + * A client that consumes records from a Kafka cluster. + * <p> + * This client transparently handles the failure of Kafka brokers, and transparently adapts as topic partitions + * it fetches migrate within the cluster. This client also interacts with the broker to allow groups of + * consumers to load balance consumption using <a href="#consumergroups">consumer groups</a>. + * <p> + * The consumer maintains TCP connections to the necessary brokers to fetch data. + * Failure to close the consumer after use will leak these connections. + * The consumer is not thread-safe. See <a href="#multithreaded">Multi-threaded Processing</a> for more details. + * + * <h3>Cross-Version Compatibility</h3> + * This client can communicate with brokers that are version 0.10.0 or newer. Older or newer brokers may not support + * certain features. For example, 0.10.0 brokers do not support offsetsForTimes, because this feature was added + * in version 0.10.1. You will receive an {@link org.apache.kafka.common.errors.UnsupportedVersionException} + * when invoking an API that is not available on the running broker version. + * <p> + * + * <h3>Offsets and Consumer Position</h3> Review Comment: Ideally we'd keep any implementation-specific comments in `LegacyKafkaConsumer` and remove them from `KafkaConsumer`. Would you be OK to do that as a separate PR? -- 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
