rdblue commented on code in PR #15006: URL: https://github.com/apache/iceberg/pull/15006#discussion_r2825137528
########## core/src/main/java/org/apache/iceberg/DVUtil.java: ########## @@ -0,0 +1,215 @@ +/* + * 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.iceberg; + +import java.io.IOException; +import java.io.UncheckedIOException; +import java.util.Comparator; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.concurrent.ExecutorService; +import java.util.stream.Collectors; +import org.apache.iceberg.deletes.BaseDVFileWriter; +import org.apache.iceberg.deletes.DVFileWriter; +import org.apache.iceberg.deletes.Deletes; +import org.apache.iceberg.deletes.PositionDeleteIndex; +import org.apache.iceberg.encryption.EncryptionManager; +import org.apache.iceberg.io.FileIO; +import org.apache.iceberg.io.LocationProvider; +import org.apache.iceberg.io.OutputFileFactory; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.apache.iceberg.types.Comparators; +import org.apache.iceberg.util.Tasks; + +class DVUtil { + private DVUtil() {} + + /** + * Merges duplicate DVs for the same data file and writes the merged DV Puffin files. If there is + * exactly 1 DV for a given data file then it is return as is + * + * @param dvsByFile map of data file location to DVs + * @return a list containing both any newly merged DVs and any DVs that are already valid + */ + static List<DeleteFile> mergeAndWriteDvsIfRequired( + Map<String, List<DeleteFile>> dvsByFile, + ExecutorService pool, + LocationProvider locationProvider, + EncryptionManager encryptionManager, + FileIO fileIO, + Map<Integer, PartitionSpec> specs) { + List<DeleteFile> finalDvs = Lists.newArrayList(); + Map<String, List<DeleteFile>> duplicateDvsByFile = Maps.newLinkedHashMap(); + for (Map.Entry<String, List<DeleteFile>> dvsForFile : dvsByFile.entrySet()) { + List<DeleteFile> dvs = dvsForFile.getValue(); + if (!dvs.isEmpty()) { + if (dvs.size() == 1) { + finalDvs.addAll(dvs); + } else { + duplicateDvsByFile.put(dvsForFile.getKey(), dvs); + } + } + } + + if (!duplicateDvsByFile.isEmpty()) { + List<DeleteFile> duplicateDvs = + duplicateDvsByFile.values().stream().flatMap(List::stream).collect(Collectors.toList()); + + Map<String, PositionDeleteIndex> mergedIndices = + readAndMergeDvs(duplicateDvs, pool, fileIO, encryptionManager, specs); + finalDvs.addAll( + writeMergedDVs( + mergedIndices, + duplicateDvsByFile, + locationProvider, + encryptionManager, + fileIO, + specs)); + } + + return finalDvs; + } + + /** + * Reads all DVs, and merge the position indices per referenced data file + * + * @param io the FileIO to use for reading DV files + * @param encryptionManager the EncryptionManager for decrypting DV files + * @param duplicateDvs list of dvs to read and merge + * @param specsById map of partition spec ID to partition spec + * @param pool executor service for reading DVs + * @return map of referenced data file location to the merged position delete index + */ + private static Map<String, PositionDeleteIndex> readAndMergeDvs( + List<DeleteFile> duplicateDvs, + ExecutorService pool, + FileIO io, + EncryptionManager encryptionManager, + Map<Integer, PartitionSpec> specsById) { + // Read all duplicate DVs in parallel + PositionDeleteIndex[] duplicateDvPositions = new PositionDeleteIndex[duplicateDvs.size()]; + Tasks.range(duplicateDvPositions.length) + .executeWith(pool) + .stopOnFailure() + .throwFailureWhenFinished() + .run( + i -> + duplicateDvPositions[i] = + Deletes.readDV(duplicateDvs.get(i), io, encryptionManager)); + + // Build a grouping of referenced file to indices of the corresponding duplicate DVs + Map<String, List<Integer>> dvIndicesByDataFile = Maps.newLinkedHashMap(); + for (int i = 0; i < duplicateDvs.size(); i++) { + dvIndicesByDataFile + .computeIfAbsent(duplicateDvs.get(i).referencedDataFile(), k -> Lists.newArrayList()) + .add(i); + } + + // Validate and merge per referenced file, caching comparators by spec ID + Map<Integer, Comparator<StructLike>> comparatorsBySpecId = Maps.newHashMap(); + Map<String, PositionDeleteIndex> result = Maps.newHashMap(); + for (Map.Entry<String, List<Integer>> entry : dvIndicesByDataFile.entrySet()) { + List<Integer> dvIndicesForFile = entry.getValue(); + int firstDVIndex = dvIndicesForFile.get(0); + PositionDeleteIndex mergedIndexForFile = duplicateDvPositions[firstDVIndex]; + DeleteFile firstDv = duplicateDvs.get(firstDVIndex); + + Comparator<StructLike> partitionComparator = + comparatorsBySpecId.computeIfAbsent( + firstDv.specId(), id -> Comparators.forType(specsById.get(id).partitionType())); + + for (int i = 1; i < dvIndicesForFile.size(); i++) { + int dvIndex = dvIndicesForFile.get(i); + DeleteFile dv = duplicateDvs.get(dvIndex); + validateDVCanBeMerged(dv, firstDv, partitionComparator); + mergedIndexForFile.merge(duplicateDvPositions[dvIndex]); + } + + result.put(entry.getKey(), mergedIndexForFile); + } + + return result; + } + + private static void validateDVCanBeMerged( + DeleteFile first, DeleteFile second, Comparator<StructLike> partitionComparator) { + Preconditions.checkArgument( + Objects.equals(first.dataSequenceNumber(), second.dataSequenceNumber()), + "Cannot merge duplicate added DVs when data sequence numbers are different, " + + "expected all to be added with sequence %s, but got %s", + first.dataSequenceNumber(), + second.dataSequenceNumber()); + + Preconditions.checkArgument( + first.specId() == second.specId(), + "Cannot merge duplicate added DVs when partition specs are different, " + + "expected all to be added with spec %s, but got %s", + first.specId(), + second.specId()); + + Preconditions.checkArgument( + partitionComparator.compare(first.partition(), second.partition()) == 0, + "Cannot merge duplicate added DVs when partition tuples are different"); + } + + // Produces a single Puffin file containing the merged DVs + private static List<DeleteFile> writeMergedDVs( + Map<String, PositionDeleteIndex> mergedIndices, Review Comment: There aren't indices here. -- This is an automated message from the Apache Git Service. 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