kamalcph commented on code in PR #13837: URL: https://github.com/apache/kafka/pull/13837#discussion_r1265061326
########## storage/src/test/java/org/apache/kafka/server/log/remote/storage/LocalTieredStorage.java: ########## @@ -0,0 +1,578 @@ +/* + * 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.remote.storage; + +import org.apache.kafka.common.TopicIdPartition; +import org.apache.kafka.common.Uuid; +import org.apache.kafka.common.errors.InvalidConfigurationException; +import org.apache.kafka.server.log.remote.storage.LocalTieredStorageListener.LocalTieredStorageListeners; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.test.TestUtils; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.ByteArrayInputStream; +import java.io.File; +import java.io.FileNotFoundException; +import java.io.FileOutputStream; +import java.io.IOException; +import java.io.InputStream; +import java.nio.ByteBuffer; +import java.nio.channels.FileChannel; +import java.nio.file.Files; +import java.nio.file.NoSuchFileException; +import java.util.Arrays; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; +import java.util.concurrent.Callable; +import java.util.concurrent.atomic.AtomicInteger; + +import static java.lang.String.format; +import static java.nio.file.Files.newInputStream; +import static java.nio.file.StandardOpenOption.READ; +import static org.apache.kafka.server.log.remote.storage.LocalTieredStorageEvent.EventType; +import static org.apache.kafka.server.log.remote.storage.LocalTieredStorageEvent.EventType.DELETE_PARTITION; +import static org.apache.kafka.server.log.remote.storage.LocalTieredStorageEvent.EventType.DELETE_SEGMENT; +import static org.apache.kafka.server.log.remote.storage.LocalTieredStorageEvent.EventType.FETCH_LEADER_EPOCH_CHECKPOINT; +import static org.apache.kafka.server.log.remote.storage.LocalTieredStorageEvent.EventType.FETCH_OFFSET_INDEX; +import static org.apache.kafka.server.log.remote.storage.LocalTieredStorageEvent.EventType.FETCH_PRODUCER_SNAPSHOT; +import static org.apache.kafka.server.log.remote.storage.LocalTieredStorageEvent.EventType.FETCH_SEGMENT; +import static org.apache.kafka.server.log.remote.storage.LocalTieredStorageEvent.EventType.FETCH_TIME_INDEX; +import static org.apache.kafka.server.log.remote.storage.LocalTieredStorageEvent.EventType.FETCH_TRANSACTION_INDEX; +import static org.apache.kafka.server.log.remote.storage.LocalTieredStorageEvent.EventType.OFFLOAD_SEGMENT; +import static org.apache.kafka.server.log.remote.storage.RemoteLogSegmentFileset.RemoteLogSegmentFileType.LEADER_EPOCH_CHECKPOINT; +import static org.apache.kafka.server.log.remote.storage.RemoteLogSegmentFileset.RemoteLogSegmentFileType.OFFSET_INDEX; +import static org.apache.kafka.server.log.remote.storage.RemoteLogSegmentFileset.RemoteLogSegmentFileType.PRODUCER_SNAPSHOT; +import static org.apache.kafka.server.log.remote.storage.RemoteLogSegmentFileset.RemoteLogSegmentFileType.SEGMENT; +import static org.apache.kafka.server.log.remote.storage.RemoteLogSegmentFileset.RemoteLogSegmentFileType.TIME_INDEX; +import static org.apache.kafka.server.log.remote.storage.RemoteLogSegmentFileset.RemoteLogSegmentFileType.TRANSACTION_INDEX; +import static org.apache.kafka.server.log.remote.storage.RemoteLogSegmentFileset.openFileset; +import static org.apache.kafka.server.log.remote.storage.RemoteTopicPartitionDirectory.openExistingTopicPartitionDirectory; +import static org.apache.kafka.server.log.remote.storage.RemoteTopicPartitionDirectory.openTopicPartitionDirectory; + +/** + * An implementation of {@link RemoteStorageManager} which relies on the local file system to store + * offloaded log segments and associated data. + * <p> + * Due to the consistency semantic of POSIX-compliant file systems, this remote storage provides strong + * read-after-write consistency and a segment's data can be accessed once the copy to the storage succeeded. + * </p> + * <p> + * In order to guarantee isolation, independence, reproducibility and consistency of unit and integration + * tests, the scope of a storage implemented by this class, and identified via the storage ID provided to + * the constructor, should be limited to a test or well-defined self-contained use-case. + * </p> + * <p> + * The local tiered storage keeps a simple structure of directories mimicking that of Apache Kafka. + * <p> + * The name of each of the files under the scope of a log segment (the log file, its indexes, etc.) + * follows the structure UuidBase64-FileType. + * <p> + * Given the root directory of the storage, segments and associated files are organized as represented below. + * </p> + * <code> + * / storage-directory / LWgrMmVrT0a__7a4SasuPA-0-topic / bCqX9U--S-6U8XUM9II25Q.log Review Comment: Updated the directory structure to `topic-partition-uuid`. -- This is an automated message from the Apache Git Service. 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