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[core] Introduce DeletionVectorIndexFileWriter (#3402)
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141 changes: 141 additions & 0 deletions
141
...n-core/src/main/java/org/apache/paimon/deletionvectors/DeletionVectorIndexFileWriter.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.paimon.deletionvectors; | ||
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| import org.apache.paimon.fs.FileIO; | ||
| import org.apache.paimon.fs.Path; | ||
| import org.apache.paimon.index.IndexFileMeta; | ||
| import org.apache.paimon.options.MemorySize; | ||
| import org.apache.paimon.utils.Pair; | ||
| import org.apache.paimon.utils.PathFactory; | ||
| import org.apache.paimon.utils.Preconditions; | ||
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| import java.io.Closeable; | ||
| import java.io.DataOutputStream; | ||
| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.Iterator; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| import static org.apache.paimon.deletionvectors.DeletionVectorsIndexFile.DELETION_VECTORS_INDEX; | ||
| import static org.apache.paimon.deletionvectors.DeletionVectorsIndexFile.VERSION_ID_V1; | ||
| import static org.apache.paimon.deletionvectors.DeletionVectorsIndexFile.calculateChecksum; | ||
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| /** Writer for deletion vector index file. */ | ||
| public class DeletionVectorIndexFileWriter { | ||
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| private final PathFactory indexPathFactory; | ||
| private final FileIO fileIO; | ||
| private final long targetSizeInBytes; | ||
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| public DeletionVectorIndexFileWriter( | ||
| FileIO fileIO, PathFactory pathFactory, MemorySize targetSizePerIndexFile) { | ||
| this.indexPathFactory = pathFactory; | ||
| this.fileIO = fileIO; | ||
| this.targetSizeInBytes = targetSizePerIndexFile.getBytes(); | ||
| } | ||
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| public List<IndexFileMeta> write(Map<String, DeletionVector> input) throws IOException { | ||
| if (input.isEmpty()) { | ||
| return emptyIndexFile(); | ||
| } | ||
| List<IndexFileMeta> result = new ArrayList<>(); | ||
| Iterator<Map.Entry<String, DeletionVector>> iterator = input.entrySet().iterator(); | ||
| while (iterator.hasNext()) { | ||
| result.add(tryWriter(iterator)); | ||
| } | ||
| return result; | ||
| } | ||
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| private IndexFileMeta tryWriter(Iterator<Map.Entry<String, DeletionVector>> iterator) | ||
| throws IOException { | ||
| SingleIndexFileWriter writer = new SingleIndexFileWriter(); | ||
| try { | ||
| while (iterator.hasNext()) { | ||
| Map.Entry<String, DeletionVector> entry = iterator.next(); | ||
| long currentSize = writer.write(entry.getKey(), entry.getValue()); | ||
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| if (writer.writtenSizeInBytes() + currentSize > targetSizeInBytes) { | ||
| break; | ||
| } | ||
| } | ||
| } finally { | ||
| writer.close(); | ||
| } | ||
| return writer.writtenIndexFile(); | ||
| } | ||
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| private List<IndexFileMeta> emptyIndexFile() throws IOException { | ||
| try (SingleIndexFileWriter writer = new SingleIndexFileWriter()) { | ||
| return Collections.singletonList(writer.writtenIndexFile()); | ||
| } | ||
| } | ||
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| private class SingleIndexFileWriter implements Closeable { | ||
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| private final Path path; | ||
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| private final DataOutputStream dataOutputStream; | ||
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| private final LinkedHashMap<String, Pair<Integer, Integer>> dvRanges; | ||
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| private long writtenSizeInBytes = 0L; | ||
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| public SingleIndexFileWriter() throws IOException { | ||
| this.path = indexPathFactory.newPath(); | ||
| this.dataOutputStream = new DataOutputStream(fileIO.newOutputStream(path, true)); | ||
| dataOutputStream.writeByte(VERSION_ID_V1); | ||
| this.dvRanges = new LinkedHashMap<>(); | ||
| } | ||
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| public long writtenSizeInBytes() { | ||
| return this.writtenSizeInBytes; | ||
| } | ||
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| public long write(String key, DeletionVector deletionVector) throws IOException { | ||
| Preconditions.checkNotNull(dataOutputStream); | ||
| byte[] data = deletionVector.serializeToBytes(); | ||
| int size = data.length; | ||
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| dvRanges.put(key, Pair.of(dataOutputStream.size(), size)); | ||
| dataOutputStream.writeInt(size); | ||
| dataOutputStream.write(data); | ||
| dataOutputStream.writeInt(calculateChecksum(data)); | ||
| writtenSizeInBytes += size; | ||
| return size; | ||
| } | ||
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| public IndexFileMeta writtenIndexFile() throws IOException { | ||
| return new IndexFileMeta( | ||
| DELETION_VECTORS_INDEX, | ||
| path.getName(), | ||
| fileIO.getFileSize(path), | ||
| dvRanges.size(), | ||
| dvRanges); | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| dataOutputStream.close(); | ||
| } | ||
| } | ||
| } |
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