danny0405 commented on code in PR #6727: URL: https://github.com/apache/hudi/pull/6727#discussion_r979152326
########## hudi-common/src/main/java/org/apache/hudi/common/table/cdc/HoodieCDCExtractor.java: ########## @@ -0,0 +1,358 @@ +/* + * 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.hudi.common.table.cdc; + +import org.apache.hadoop.fs.FileStatus; +import org.apache.hadoop.fs.FileSystem; +import org.apache.hadoop.fs.Path; + +import org.apache.hudi.common.fs.FSUtils; +import org.apache.hudi.common.model.HoodieBaseFile; +import org.apache.hudi.common.model.HoodieCommitMetadata; +import org.apache.hudi.common.model.HoodieFileFormat; +import org.apache.hudi.common.model.HoodieFileGroupId; +import org.apache.hudi.common.model.HoodieLogFile; +import org.apache.hudi.common.model.HoodieReplaceCommitMetadata; +import org.apache.hudi.common.model.HoodieWriteStat; +import org.apache.hudi.common.model.FileSlice; +import org.apache.hudi.common.model.WriteOperationType; +import org.apache.hudi.common.table.HoodieTableMetaClient; +import org.apache.hudi.common.table.timeline.HoodieActiveTimeline; +import org.apache.hudi.common.table.timeline.HoodieInstant; +import org.apache.hudi.common.table.timeline.HoodieTimeline; +import org.apache.hudi.common.table.view.HoodieTableFileSystemView; +import org.apache.hudi.common.util.Option; +import org.apache.hudi.common.util.StringUtils; +import org.apache.hudi.common.util.collection.Pair; +import org.apache.hudi.exception.HoodieException; +import org.apache.hudi.exception.HoodieIOException; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Locale; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; + +import static org.apache.hudi.common.table.cdc.HoodieCDCLogicalFileType.ADD_BASE_FILE; +import static org.apache.hudi.common.table.cdc.HoodieCDCLogicalFileType.CDC_LOG_FILE; +import static org.apache.hudi.common.table.cdc.HoodieCDCLogicalFileType.MOR_LOG_FILE; +import static org.apache.hudi.common.table.cdc.HoodieCDCLogicalFileType.REMOVE_BASE_FILE; +import static org.apache.hudi.common.table.cdc.HoodieCDCLogicalFileType.REPLACED_FILE_GROUP; +import static org.apache.hudi.common.table.timeline.HoodieTimeline.COMMIT_ACTION; +import static org.apache.hudi.common.table.timeline.HoodieTimeline.DELTA_COMMIT_ACTION; +import static org.apache.hudi.common.table.timeline.HoodieTimeline.isInRange; +import static org.apache.hudi.common.table.timeline.HoodieTimeline.REPLACE_COMMIT_ACTION; + +/** + * This class helps to extract all the information which will be used when CDC query. + * + * There are some steps: + * 1. filter out the completed commit instants, and get the related [[HoodieCommitMetadata]] objects. + * 2. initialize the [[HoodieTableFileSystemView]] by the touched data files. + * 3. extract the cdc information: + * generate a [[CDCFileSplit]] object for each of the instant in (startInstant, endInstant) + * and each of the file group which is touched in the range of instants. + */ +public class HoodieCDCExtractor { + + private final HoodieTableMetaClient metaClient; + + private final Path basePath; + + private final FileSystem fs; + + private final HoodieCDCSupplementalLoggingMode supplementalLoggingMode; + + private final String startInstant; + + private final String endInstant; + + private Map<HoodieInstant, HoodieCommitMetadata> commits; + + private HoodieTableFileSystemView fsView; + + public HoodieCDCExtractor( + HoodieTableMetaClient metaClient, + String startInstant, + String endInstant) { + this.metaClient = metaClient; + this.basePath = metaClient.getBasePathV2(); + this.fs = metaClient.getFs().getFileSystem(); + this.supplementalLoggingMode = HoodieCDCSupplementalLoggingMode.parse( + metaClient.getTableConfig().cdcSupplementalLoggingMode()); + this.startInstant = startInstant; + this.endInstant = endInstant; + init(); + } + + private void init() { + initInstantAndCommitMetadatas(); + initFSView(); + } + + /** + * At the granularity of a file group, trace the mapping between + * each commit/instant and changes to this file group. + */ + public Map<HoodieFileGroupId, List<Pair<HoodieInstant, HoodieCDCFileSplit>>> extractCDCFileSplits() { + if (commits == null || fsView == null) { + throw new HoodieException("Fail to init CDCExtractor"); + } + + Map<HoodieFileGroupId, List<Pair<HoodieInstant, HoodieCDCFileSplit>>> fgToCommitChanges = new HashMap<>(); + for (HoodieInstant instant : commits.keySet()) { + HoodieCommitMetadata commitMetadata = commits.get(instant); + + // parse `partitionToWriteStats` in the metadata of commit + Map<String, List<HoodieWriteStat>> ptToWriteStats = commitMetadata.getPartitionToWriteStats(); + for (String partition : ptToWriteStats.keySet()) { + List<HoodieWriteStat> hoodieWriteStats = ptToWriteStats.get(partition); + hoodieWriteStats.forEach(writeStat -> { + HoodieFileGroupId fileGroupId = new HoodieFileGroupId(partition, writeStat.getFileId()); + // Identify the CDC source involved in this commit and + // determine its type for subsequent loading using different methods. + HoodieCDCFileSplit changeFile = + parseWriteStat(fileGroupId, instant, writeStat, commitMetadata.getOperationType()); + if (!fgToCommitChanges.containsKey(fileGroupId)) { + fgToCommitChanges.put(fileGroupId, new ArrayList<>()); Review Comment: Use `computeIfAbsent` should be fine. -- This is an automated message from the Apache Git Service. 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