TanYuxin-tyx commented on code in PR #22851: URL: https://github.com/apache/flink/pull/22851#discussion_r1253922689
########## flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/hybrid/tiered/file/SegmentPartitionFile.java: ########## @@ -0,0 +1,159 @@ +/* + * 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.flink.runtime.io.network.partition.hybrid.tiered.file; + +import org.apache.flink.core.fs.FileStatus; +import org.apache.flink.core.fs.FileSystem; +import org.apache.flink.core.fs.Path; +import org.apache.flink.runtime.io.network.partition.hybrid.tiered.common.TieredStorageIdMappingUtils; +import org.apache.flink.runtime.io.network.partition.hybrid.tiered.common.TieredStoragePartitionId; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.io.OutputStream; +import java.nio.ByteBuffer; +import java.nio.channels.WritableByteChannel; + +import static org.apache.flink.util.Preconditions.checkState; + +/** + * The partition file with segment file mode. In this mode, each segment of one subpartition is + * written to an independent file. + */ +public class SegmentPartitionFile { + + private static final Logger LOG = LoggerFactory.getLogger(SegmentPartitionFile.class); + + static final String TIERED_STORAGE_DIR = "tiered-storage"; + + static final String SEGMENT_FILE_PREFIX = "seg-"; + + static final String SEGMENT_FINISH_DIR_NAME = "FINISH"; + + public static SegmentPartitionFileWriter createPartitionFileWriter( + String dataFilePath, int numSubpartitions) { + return new SegmentPartitionFileWriter(dataFilePath, numSubpartitions); + } + + public static SegmentPartitionFileReader createPartitionFileReader(String dataFilePath) { + return new SegmentPartitionFileReader(dataFilePath); + } + + // ------------------------------------------------------------------------ + // File-related utilities + // ------------------------------------------------------------------------ + + public static String getTieredStoragePath(String basePath) { + return String.format("%s/%s", basePath, TIERED_STORAGE_DIR); + } + + public static String getPartitionPath(TieredStoragePartitionId partitionId, String basePath) { + if (basePath == null) { + return null; + } + + while (basePath.endsWith("/") && basePath.length() > 1) { + basePath = basePath.substring(0, basePath.length() - 1); + } + return String.format("%s/%s", basePath, TieredStorageIdMappingUtils.convertId(partitionId)); + } + + public static String getSubpartitionPath( + String basePath, TieredStoragePartitionId partitionId, int subpartitionId) { + while (basePath.endsWith("/") && basePath.length() > 1) { + basePath = basePath.substring(0, basePath.length() - 1); + } + return String.format( + "%s/%s/%s", + basePath, TieredStorageIdMappingUtils.convertId(partitionId), subpartitionId); + } + + public static Path getSegmentPath( + String basePath, + TieredStoragePartitionId partitionId, + int subpartitionId, + long segmentId) { + String subpartitionPath = getSubpartitionPath(basePath, partitionId, subpartitionId); + return new Path(subpartitionPath, SEGMENT_FILE_PREFIX + segmentId); + } + + public static Path getSegmentFinishDirPath( + String basePath, TieredStoragePartitionId partitionId, int subpartitionId) { + String subpartitionPath = getSubpartitionPath(basePath, partitionId, subpartitionId); + return new Path(subpartitionPath, SEGMENT_FINISH_DIR_NAME); + } + + public static void writeBuffers( + WritableByteChannel writeChannel, long expectedBytes, ByteBuffer[] bufferWithHeaders) + throws IOException { + int writeSize = 0; + for (ByteBuffer bufferWithHeader : bufferWithHeaders) { + writeSize += writeChannel.write(bufferWithHeader); + } + checkState(writeSize == expectedBytes, "Wong number of written bytes."); + } + + public static void writeSegmentFinishFile( + String basePath, + TieredStoragePartitionId partitionId, + int subpartitionId, + int segmentId) + throws IOException { + Path segmentFinishDir = getSegmentFinishDirPath(basePath, partitionId, subpartitionId); + FileSystem fs = segmentFinishDir.getFileSystem(); + Path segmentFinishFile = new Path(segmentFinishDir, String.valueOf(segmentId)); + if (!fs.exists(segmentFinishDir)) { + fs.mkdirs(segmentFinishDir); + OutputStream outputStream = + fs.create(segmentFinishFile, FileSystem.WriteMode.OVERWRITE); + outputStream.close(); + return; + } + + FileStatus[] files = fs.listStatus(segmentFinishDir); + if (files.length == 0) { + OutputStream outputStream = + fs.create(segmentFinishFile, FileSystem.WriteMode.OVERWRITE); + outputStream.close(); + } else { + // Note that this check requires the file system to ensure that only one file is in the + // directory can be accessed when renaming a file. + checkState(files.length == 1, "Wong number of segment-finish files."); + fs.rename(files[0].getPath(), segmentFinishFile); Review Comment: Added doc to explain this. -- This is an automated message from the Apache Git Service. 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