ijuma commented on code in PR #13046: URL: https://github.com/apache/kafka/pull/13046#discussion_r1097325246
########## storage/src/main/java/org/apache/kafka/server/log/internals/LeaderEpochFileCache.java: ########## @@ -0,0 +1,385 @@ +/* + * 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.server.log.internals; + +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.storage.internals.checkpoint.LeaderEpochCheckpoint; +import org.slf4j.Logger; + +import java.util.AbstractMap; +import java.util.ArrayList; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Optional; +import java.util.OptionalInt; +import java.util.TreeMap; +import java.util.concurrent.locks.ReentrantReadWriteLock; +import java.util.function.Predicate; + +import static org.apache.kafka.common.requests.OffsetsForLeaderEpochResponse.UNDEFINED_EPOCH; +import static org.apache.kafka.common.requests.OffsetsForLeaderEpochResponse.UNDEFINED_EPOCH_OFFSET; + +/** + * Represents a cache of (LeaderEpoch => Offset) mappings for a particular replica. + * <p> + * Leader Epoch = epoch assigned to each leader by the controller. + * Offset = offset of the first message in each epoch. + */ +public class LeaderEpochFileCache { + private final LeaderEpochCheckpoint checkpoint; + private final Logger log; + + private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); + private final TreeMap<Integer, EpochEntry> epochs = new TreeMap<>(); + + /** + * @param topicPartition the associated topic partition + * @param checkpoint the checkpoint file + */ + public LeaderEpochFileCache(TopicPartition topicPartition, LeaderEpochCheckpoint checkpoint) { + this.checkpoint = checkpoint; + LogContext logContext = new LogContext("[LeaderEpochCache " + topicPartition + "] "); + log = logContext.logger(LeaderEpochFileCache.class); + checkpoint.read().forEach(this::assign); Review Comment: My bad, we are calling the private `assign` overload., not the public one. -- 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
