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use manifest index for skipping complete data file
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Prashant Singh
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Apr 12, 2022
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112 changes: 112 additions & 0 deletions
112
core/src/main/java/org/apache/iceberg/MicroBatchesUtil.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.iceberg; | ||
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| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.stream.Collectors; | ||
| import org.apache.iceberg.io.CloseableIterable; | ||
| import org.apache.iceberg.io.FileIO; | ||
| import org.apache.iceberg.relocated.com.google.common.base.Preconditions; | ||
| import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; | ||
| import org.apache.iceberg.relocated.com.google.common.collect.Lists; | ||
| import org.apache.iceberg.util.Pair; | ||
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| public class MicroBatchesUtil { | ||
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| private MicroBatchesUtil() { | ||
| } | ||
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| public static List<Pair<ManifestFile, Integer>> skippedManifestIndexesFromSnapshot( | ||
| Snapshot snapshot, long startFileIndex, boolean scanAllFiles) { | ||
| Preconditions.checkArgument(startFileIndex >= 0, "startFileIndex is unexpectedly smaller than 0"); | ||
| List<ManifestFile> manifests = scanAllFiles ? snapshot.dataManifests() : | ||
| snapshot.dataManifests().stream().filter(m -> m.snapshotId().equals(snapshot.snapshotId())) | ||
| .collect(Collectors.toList()); | ||
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| List<Pair<ManifestFile, Integer>> manifestIndexes = MicroBatchesUtil.indexManifests(manifests); | ||
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| return MicroBatchesUtil.skipManifests(manifestIndexes, startFileIndex); | ||
| } | ||
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| public static CloseableIterable<FileScanTask> openManifestFile(FileIO io, Map<Integer, PartitionSpec> specsById, | ||
| boolean caseSensitive, Snapshot snapshot, ManifestFile manifestFile, boolean scanAllFiles) { | ||
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| ManifestGroup manifestGroup = new ManifestGroup(io, ImmutableList.of(manifestFile)) | ||
| .specsById(specsById) | ||
| .caseSensitive(caseSensitive); | ||
| if (!scanAllFiles) { | ||
| manifestGroup = manifestGroup | ||
| .filterManifestEntries(entry -> | ||
| entry.snapshotId() == snapshot.snapshotId() && entry.status() == ManifestEntry.Status.ADDED) | ||
| .ignoreDeleted(); | ||
| } | ||
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| return manifestGroup.planFiles(); | ||
| } | ||
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| /** | ||
| * Method to index the data files for each manifest. For example, if manifest m1 has 3 data files, manifest | ||
| * m2 has 2 data files, manifest m3 has 1 data file, then the index will be (m1, 0), (m2, 3), (m3, 5). | ||
| * | ||
| * @param manifestFiles List of input manifests used to index. | ||
| * @return a list of manifest index with key as manifest file, value as file counts. | ||
| */ | ||
| private static List<Pair<ManifestFile, Integer>> indexManifests(List<ManifestFile> manifestFiles) { | ||
| int currentFileIndex = 0; | ||
| List<Pair<ManifestFile, Integer>> manifestIndexes = Lists.newArrayList(); | ||
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| for (ManifestFile manifest : manifestFiles) { | ||
| manifestIndexes.add(Pair.of(manifest, currentFileIndex)); | ||
| currentFileIndex += manifest.addedFilesCount() + manifest.existingFilesCount(); | ||
| } | ||
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| return manifestIndexes; | ||
| } | ||
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| /** | ||
| * Method to skip the manifest file in which the index is smaller than startFileIndex. For example, if the | ||
| * index list is : (m1, 0), (m2, 3), (m3, 5), and startFileIndex is 4, then the returned manifest index list is: | ||
| * (m2, 3), (m3, 5). | ||
| * | ||
| * @param indexedManifests List of input manifests. | ||
| * @param startFileIndex Index used to skip the processed manifests. | ||
| * @return a sub-list of manifest file index which only contains the manifest indexes larger than the | ||
| * startFileIndex. | ||
| */ | ||
| private static List<Pair<ManifestFile, Integer>> skipManifests(List<Pair<ManifestFile, Integer>> indexedManifests, | ||
| long startFileIndex) { | ||
| if (startFileIndex == 0) { | ||
| return indexedManifests; | ||
| } | ||
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| int manifestIndex = 0; | ||
| for (Pair<ManifestFile, Integer> manifest : indexedManifests) { | ||
| if (manifest.second() > startFileIndex) { | ||
| break; | ||
| } | ||
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| manifestIndex++; | ||
| } | ||
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| return indexedManifests.subList(manifestIndex - 1, indexedManifests.size()); | ||
| } | ||
| } |
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