rodmeneses commented on code in PR #10179: URL: https://github.com/apache/iceberg/pull/10179#discussion_r1626559065
########## flink/v1.19/flink/src/main/java/org/apache/iceberg/flink/sink/committer/IcebergWriteAggregator.java: ########## @@ -0,0 +1,172 @@ +/* + * 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.flink.sink.committer; + +import java.io.IOException; +import java.util.Collection; +import java.util.function.Supplier; +import org.apache.flink.core.io.SimpleVersionedSerialization; +import org.apache.flink.streaming.api.connector.sink2.CommittableMessage; +import org.apache.flink.streaming.api.connector.sink2.CommittableSummary; +import org.apache.flink.streaming.api.connector.sink2.CommittableWithLineage; +import org.apache.flink.streaming.api.operators.AbstractStreamOperator; +import org.apache.flink.streaming.api.operators.OneInputStreamOperator; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.iceberg.DeleteFile; +import org.apache.iceberg.ManifestFile; +import org.apache.iceberg.ManifestFiles; +import org.apache.iceberg.ManifestWriter; +import org.apache.iceberg.PartitionSpec; +import org.apache.iceberg.Table; +import org.apache.iceberg.flink.TableLoader; +import org.apache.iceberg.flink.sink.DeltaManifests; +import org.apache.iceberg.flink.sink.DeltaManifestsSerializer; +import org.apache.iceberg.flink.sink.FlinkManifestUtil; +import org.apache.iceberg.flink.sink.ManifestOutputFileFactory; +import org.apache.iceberg.io.OutputFile; +import org.apache.iceberg.io.WriteResult; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.relocated.com.google.common.collect.Sets; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Operator which aggregates the individual {@link WriteResult} objects) to a single {@link + * IcebergCommittable} per checkpoint (storing the serialized {@link DeltaManifests}, jobId, + * operatorId, checkpointId) + */ +public class IcebergWriteAggregator + extends AbstractStreamOperator<CommittableMessage<IcebergCommittable>> + implements OneInputStreamOperator< + CommittableMessage<WriteResult>, CommittableMessage<IcebergCommittable>> { + private static final Logger LOG = LoggerFactory.getLogger(IcebergWriteAggregator.class); + private static final byte[] EMPTY_MANIFEST_DATA = new byte[0]; + private final Collection<WriteResult> results; + private transient ManifestOutputFileFactory icebergManifestOutputFileFactory; + private transient Table table; + private final TableLoader tableLoader; + private final String prefix; + private static final int FORMAT_V2 = 2; + private static final Long DUMMY_SNAPSHOT_ID = 0L; + + public IcebergWriteAggregator(TableLoader tableLoader, String prefix) { + this.results = Sets.newHashSet(); + this.tableLoader = tableLoader; + this.prefix = prefix; + } + + @Override + public void open() throws Exception { + if (!tableLoader.isOpen()) { + tableLoader.open(); + + this.table = tableLoader.loadTable(); + this.icebergManifestOutputFileFactory = + FlinkManifestUtil.createOutputFileFactory(() -> table, table.properties(), prefix); + } + } + + @Override + public void finish() throws IOException { + prepareSnapshotPreBarrier(Long.MAX_VALUE); + } + + @Override + public void prepareSnapshotPreBarrier(long checkpointId) throws IOException { + IcebergCommittable committable = + new IcebergCommittable( + writeToManifest(results, checkpointId), + getContainingTask().getEnvironment().getJobID().toString(), + getRuntimeContext().getOperatorUniqueID(), + checkpointId); + CommittableMessage<IcebergCommittable> message = + new CommittableWithLineage<>(committable, checkpointId, 0); + CommittableMessage<IcebergCommittable> summary = + new CommittableSummary<>(0, 1, checkpointId, 1, 1, 0); + output.collect(new StreamRecord<>(summary)); + output.collect(new StreamRecord<>(message)); + LOG.info("Aggregated commit message emitted {}", message); + results.clear(); + } + + /** + * Write all the completed data files to a newly created manifest file and return the manifest's + * avro serialized bytes. + */ + public byte[] writeToManifest(Collection<WriteResult> writeResults, long checkpointId) + throws IOException { + if (writeResults.isEmpty()) { + return EMPTY_MANIFEST_DATA; + } + + WriteResult result = WriteResult.builder().addAll(writeResults).build(); + DeltaManifests deltaManifests = + writeCompletedFiles( + result, () -> icebergManifestOutputFileFactory.create(checkpointId), table.spec()); + + return SimpleVersionedSerialization.writeVersionAndSerialize( + DeltaManifestsSerializer.INSTANCE, deltaManifests); + } + + /** + * Write the {@link WriteResult} to temporary manifest files. + * + * @param result all those DataFiles/DeleteFiles in this WriteResult should be written with same + * partition spec + */ + public static DeltaManifests writeCompletedFiles( + WriteResult result, Supplier<OutputFile> outputFileSupplier, PartitionSpec spec) + throws IOException { + + ManifestFile dataManifest = null; + ManifestFile deleteManifest = null; + + // Write the completed data files into a newly created data manifest file. + if (result.dataFiles() != null && result.dataFiles().length > 0) { + dataManifest = + FlinkManifestUtil.writeDataFiles( + outputFileSupplier.get(), spec, Lists.newArrayList(result.dataFiles())); + } + + // Write the completed delete files into a newly created delete manifest file. + if (result.deleteFiles() != null && result.deleteFiles().length > 0) { + OutputFile deleteManifestFile = outputFileSupplier.get(); + + ManifestWriter<DeleteFile> deleteManifestWriter = + ManifestFiles.writeDeleteManifest(FORMAT_V2, spec, deleteManifestFile, DUMMY_SNAPSHOT_ID); + try (ManifestWriter<DeleteFile> writer = deleteManifestWriter) { + for (DeleteFile deleteFile : result.deleteFiles()) { + writer.add(deleteFile); + } + } + + deleteManifest = deleteManifestWriter.toManifestFile(); + } + + return new DeltaManifests(dataManifest, deleteManifest, result.referencedDataFiles()); + } + + @Override + public void processElement(StreamRecord<CommittableMessage<WriteResult>> element) + throws Exception { + if (element.isRecord() && element.getValue() instanceof CommittableWithLineage) { Review Comment: @stevenzwu did you mean that if `element.getValue()` is `true` but `element.getValue() instanceof CommittableWithLineage` is false, we should throw an error? -- This is an automated message from the Apache Git Service. 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