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[flink] Small changelog files can now be compacted into big files
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299
...mon/src/main/java/org/apache/paimon/flink/compact/changelog/ChangelogCompactOperator.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. | ||
| */ | ||
|
|
||
| package org.apache.paimon.flink.compact.changelog; | ||
|
|
||
| import org.apache.paimon.data.BinaryRow; | ||
| import org.apache.paimon.flink.compact.changelog.format.CompactedChangelogReadOnlyFormat; | ||
| import org.apache.paimon.flink.sink.Committable; | ||
| import org.apache.paimon.fs.Path; | ||
| import org.apache.paimon.fs.PositionOutputStream; | ||
| import org.apache.paimon.fs.SeekableInputStream; | ||
| import org.apache.paimon.io.CompactIncrement; | ||
| import org.apache.paimon.io.DataFileMeta; | ||
| import org.apache.paimon.io.DataFilePathFactory; | ||
| import org.apache.paimon.io.DataIncrement; | ||
| import org.apache.paimon.table.FileStoreTable; | ||
| import org.apache.paimon.table.sink.CommitMessageImpl; | ||
| import org.apache.paimon.utils.FileStorePathFactory; | ||
| import org.apache.paimon.utils.IOUtils; | ||
| import org.apache.paimon.utils.Preconditions; | ||
|
|
||
| import org.apache.flink.streaming.api.operators.AbstractStreamOperator; | ||
| import org.apache.flink.streaming.api.operators.BoundedOneInput; | ||
| import org.apache.flink.streaming.api.operators.OneInputStreamOperator; | ||
| import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.UUID; | ||
|
|
||
| /** | ||
| * Operator to compact several changelog files from the same partition into one file, in order to | ||
| * reduce the number of small files. | ||
| */ | ||
| public class ChangelogCompactOperator extends AbstractStreamOperator<Committable> | ||
| implements OneInputStreamOperator<Committable, Committable>, BoundedOneInput { | ||
|
|
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| private final FileStoreTable table; | ||
|
|
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| private transient FileStorePathFactory pathFactory; | ||
| private transient long checkpointId; | ||
| private transient Map<BinaryRow, OutputStream> outputStreams; | ||
| private transient Map<BinaryRow, List<Result>> results; | ||
|
|
||
| public ChangelogCompactOperator(FileStoreTable table) { | ||
| this.table = table; | ||
| } | ||
|
|
||
| @Override | ||
| public void open() throws Exception { | ||
| super.open(); | ||
|
|
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| pathFactory = table.store().pathFactory(); | ||
| checkpointId = Long.MIN_VALUE; | ||
| outputStreams = new HashMap<>(); | ||
| results = new HashMap<>(); | ||
| } | ||
|
|
||
| @Override | ||
| public void processElement(StreamRecord<Committable> record) throws Exception { | ||
| Committable committable = record.getValue(); | ||
| checkpointId = Math.max(checkpointId, committable.checkpointId()); | ||
| if (committable.kind() != Committable.Kind.FILE) { | ||
| output.collect(record); | ||
| return; | ||
| } | ||
|
|
||
| CommitMessageImpl message = (CommitMessageImpl) committable.wrappedCommittable(); | ||
| if (message.newFilesIncrement().changelogFiles().isEmpty() | ||
| && message.compactIncrement().changelogFiles().isEmpty()) { | ||
| output.collect(record); | ||
| return; | ||
| } | ||
|
|
||
| // copy changelogs from the same partition into one file | ||
| DataFilePathFactory dataFilePathFactory = | ||
| pathFactory.createDataFilePathFactory(message.partition(), message.bucket()); | ||
| for (DataFileMeta meta : message.newFilesIncrement().changelogFiles()) { | ||
| copyFile( | ||
| dataFilePathFactory.toPath(meta.fileName()), | ||
| message.partition(), | ||
| message.bucket(), | ||
| false, | ||
| meta); | ||
| } | ||
| for (DataFileMeta meta : message.compactIncrement().changelogFiles()) { | ||
| copyFile( | ||
| dataFilePathFactory.toPath(meta.fileName()), | ||
| message.partition(), | ||
| message.bucket(), | ||
| true, | ||
| meta); | ||
| } | ||
|
|
||
| // send commit message without changelog files | ||
| CommitMessageImpl newMessage = | ||
| new CommitMessageImpl( | ||
| message.partition(), | ||
| message.bucket(), | ||
| new DataIncrement( | ||
| message.newFilesIncrement().newFiles(), | ||
| message.newFilesIncrement().deletedFiles(), | ||
| Collections.emptyList()), | ||
| new CompactIncrement( | ||
| message.compactIncrement().compactBefore(), | ||
| message.compactIncrement().compactAfter(), | ||
| Collections.emptyList()), | ||
| message.indexIncrement()); | ||
| Committable newCommittable = | ||
| new Committable(committable.checkpointId(), Committable.Kind.FILE, newMessage); | ||
| if (record.hasTimestamp()) { | ||
| output.collect(new StreamRecord<>(newCommittable, record.getTimestamp())); | ||
| } else { | ||
| output.collect(new StreamRecord<>(newCommittable)); | ||
| } | ||
| } | ||
|
|
||
| private void copyFile( | ||
| Path path, BinaryRow partition, int bucket, boolean isCompactResult, DataFileMeta meta) | ||
| throws Exception { | ||
| if (!outputStreams.containsKey(partition)) { | ||
| Path outputPath = | ||
| new Path(path.getParent(), "tmp-compacted-changelog-" + UUID.randomUUID()); | ||
| outputStreams.put( | ||
| partition, | ||
| new OutputStream( | ||
| outputPath, table.fileIO().newOutputStream(outputPath, false))); | ||
| } | ||
|
|
||
| OutputStream outputStream = outputStreams.get(partition); | ||
| long offset = outputStream.out.getPos(); | ||
| try (SeekableInputStream in = table.fileIO().newInputStream(path)) { | ||
| IOUtils.copyBytes(in, outputStream.out, IOUtils.BLOCKSIZE, false); | ||
| } | ||
| table.fileIO().deleteQuietly(path); | ||
| results.computeIfAbsent(partition, p -> new ArrayList<>()) | ||
| .add( | ||
| new Result( | ||
| bucket, | ||
| isCompactResult, | ||
| meta, | ||
| offset, | ||
| outputStream.out.getPos() - offset)); | ||
|
|
||
| if (outputStream.out.getPos() >= table.coreOptions().targetFileSize(false)) { | ||
| flushPartition(partition); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public void prepareSnapshotPreBarrier(long checkpointId) throws Exception { | ||
| flushAllPartitions(); | ||
| } | ||
|
|
||
| @Override | ||
| public void endInput() throws Exception { | ||
| flushAllPartitions(); | ||
| } | ||
|
|
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| private void flushAllPartitions() throws Exception { | ||
| List<BinaryRow> partitions = new ArrayList<>(outputStreams.keySet()); | ||
| for (BinaryRow partition : partitions) { | ||
| flushPartition(partition); | ||
| } | ||
| } | ||
|
|
||
| private void flushPartition(BinaryRow partition) throws Exception { | ||
| OutputStream outputStream = outputStreams.get(partition); | ||
| outputStream.out.close(); | ||
|
|
||
| Result baseResult = results.get(partition).get(0); | ||
| Preconditions.checkArgument(baseResult.offset == 0); | ||
| DataFilePathFactory dataFilePathFactory = | ||
| pathFactory.createDataFilePathFactory(partition, baseResult.bucket); | ||
| // see Java docs of `CompactedChangelogFormatReaderFactory` | ||
| String realName = | ||
| "compacted-changelog-" | ||
| + UUID.randomUUID() | ||
| + "$" | ||
| + baseResult.bucket | ||
| + "-" | ||
| + baseResult.length; | ||
| table.fileIO() | ||
| .rename( | ||
| outputStream.path, | ||
| dataFilePathFactory.toPath( | ||
| realName | ||
| + "." | ||
| + CompactedChangelogReadOnlyFormat.getIdentifier( | ||
| baseResult.meta.fileFormat()))); | ||
|
|
||
| Map<Integer, List<Result>> grouped = new HashMap<>(); | ||
| for (Result result : results.get(partition)) { | ||
| grouped.computeIfAbsent(result.bucket, b -> new ArrayList<>()).add(result); | ||
| } | ||
|
|
||
| for (Map.Entry<Integer, List<Result>> entry : grouped.entrySet()) { | ||
| List<DataFileMeta> newFilesChangelog = new ArrayList<>(); | ||
| List<DataFileMeta> compactChangelog = new ArrayList<>(); | ||
| for (Result result : entry.getValue()) { | ||
| // see Java docs of `CompactedChangelogFormatReaderFactory` | ||
| String name = | ||
| (result.offset == 0 | ||
| ? realName | ||
| : realName + "-" + result.offset + "-" + result.length) | ||
| + "." | ||
| + CompactedChangelogReadOnlyFormat.getIdentifier( | ||
| result.meta.fileFormat()); | ||
| if (result.isCompactResult) { | ||
| compactChangelog.add(result.meta.rename(name)); | ||
| } else { | ||
| newFilesChangelog.add(result.meta.rename(name)); | ||
| } | ||
| } | ||
|
|
||
| CommitMessageImpl newMessage = | ||
| new CommitMessageImpl( | ||
| partition, | ||
| entry.getKey(), | ||
| new DataIncrement( | ||
| Collections.emptyList(), | ||
| Collections.emptyList(), | ||
| newFilesChangelog), | ||
| new CompactIncrement( | ||
| Collections.emptyList(), | ||
| Collections.emptyList(), | ||
| compactChangelog)); | ||
| Committable newCommittable = | ||
| new Committable(checkpointId, Committable.Kind.FILE, newMessage); | ||
| output.collect(new StreamRecord<>(newCommittable)); | ||
| } | ||
|
|
||
| outputStreams.remove(partition); | ||
| results.remove(partition); | ||
| } | ||
|
|
||
| @Override | ||
| public void close() throws Exception { | ||
| for (Map.Entry<BinaryRow, OutputStream> entry : outputStreams.entrySet()) { | ||
| OutputStream outputStream = entry.getValue(); | ||
| try { | ||
| outputStream.out.close(); | ||
| } catch (Exception e) { | ||
| LOG.warn("Failed to close output stream for file " + outputStream.path, e); | ||
| } | ||
| table.fileIO().deleteQuietly(outputStream.path); | ||
| } | ||
|
|
||
| outputStreams.clear(); | ||
| results.clear(); | ||
| } | ||
|
|
||
| private static class OutputStream { | ||
|
|
||
| private final Path path; | ||
| private final PositionOutputStream out; | ||
|
|
||
| private OutputStream(Path path, PositionOutputStream out) { | ||
| this.path = path; | ||
| this.out = out; | ||
| } | ||
| } | ||
|
|
||
| private static class Result { | ||
|
|
||
| private final int bucket; | ||
| private final boolean isCompactResult; | ||
| private final DataFileMeta meta; | ||
| private final long offset; | ||
| private final long length; | ||
|
|
||
| private Result( | ||
| int bucket, boolean isCompactResult, DataFileMeta meta, long offset, long length) { | ||
| this.bucket = bucket; | ||
| this.isCompactResult = isCompactResult; | ||
| this.meta = meta; | ||
| this.offset = offset; | ||
| this.length = length; | ||
| } | ||
| } | ||
| } |
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