pvary commented on code in PR #15996: URL: https://github.com/apache/iceberg/pull/15996#discussion_r3280415996
########## flink/v2.1/flink/src/main/java/org/apache/iceberg/flink/maintenance/operator/EqualityConvertDVResolver.java: ########## @@ -0,0 +1,281 @@ +/* + * 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.maintenance.operator; + +import java.io.IOException; +import java.io.UncheckedIOException; +import java.util.List; +import java.util.Map; +import org.apache.flink.annotation.Internal; +import org.apache.flink.streaming.api.operators.AbstractStreamOperator; +import org.apache.flink.streaming.api.operators.TwoInputStreamOperator; +import org.apache.flink.streaming.api.watermark.Watermark; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.iceberg.DataFile; +import org.apache.iceberg.DeleteFile; +import org.apache.iceberg.FileFormat; +import org.apache.iceberg.ManifestFile; +import org.apache.iceberg.ManifestFiles; +import org.apache.iceberg.ManifestReader; +import org.apache.iceberg.PartitionSpec; +import org.apache.iceberg.Snapshot; +import org.apache.iceberg.StructLike; +import org.apache.iceberg.Table; +import org.apache.iceberg.data.BaseDeleteLoader; +import org.apache.iceberg.data.DeleteLoader; +import org.apache.iceberg.deletes.BaseDVFileWriter; +import org.apache.iceberg.deletes.PositionDeleteIndex; +import org.apache.iceberg.flink.TableLoader; +import org.apache.iceberg.io.DeleteWriteResult; +import org.apache.iceberg.io.OutputFileFactory; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.apache.iceberg.util.ContentFileUtil; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Keyed parallel resolver that buffers {@link DVPosition}s per data-file path, then writes Puffin + * DV files directly via {@link BaseDVFileWriter}. Plan metadata arrives broadcast on input 2, so + * every parallel task sees the cycle's metadata and can validate against the main snapshot. + * + * <p>Buffered positions are transient per-task. On failure recovery, upstream replay rebuilds them. + */ +@Internal +public class EqualityConvertDVResolver extends AbstractStreamOperator<DVMergeResult> + implements TwoInputStreamOperator<DVPosition, EqualityConvertPlanResult, DVMergeResult> { + + private static final Logger LOG = LoggerFactory.getLogger(EqualityConvertDVResolver.class); + + private final String tableName; + private final String taskName; + private final TableLoader tableLoader; + private final String targetBranch; + + private transient Table table; + private transient OutputFileFactory fileFactory; + private transient DeleteLoader deleteLoader; + private transient Map<String, List<Long>> positionsByFile; + private transient EqualityConvertPlanResult planResult; + private transient boolean hasUpstreamError; + + public EqualityConvertDVResolver( + String tableName, String taskName, TableLoader tableLoader, String targetBranch) { + this.tableName = tableName; + this.taskName = taskName; + this.tableLoader = tableLoader; + this.targetBranch = targetBranch; + } + + @Override + public void open() throws Exception { + super.open(); + if (!tableLoader.isOpen()) { + tableLoader.open(); + } + + table = tableLoader.loadTable(); + int subtaskIndex = getRuntimeContext().getTaskInfo().getIndexOfThisSubtask(); + fileFactory = + OutputFileFactory.builderFor(table, subtaskIndex, 0L).format(FileFormat.PUFFIN).build(); + deleteLoader = new BaseDeleteLoader(deleteFile -> table.io().newInputFile(deleteFile)); + positionsByFile = Maps.newHashMap(); + } + + @Override + public void processElement1(StreamRecord<DVPosition> record) { + DVPosition pos = record.getValue(); + if (pos.isAbort()) { + hasUpstreamError = true; + } + + if (!hasUpstreamError) { + positionsByFile + .computeIfAbsent(pos.dataFilePath(), k -> Lists.newArrayList()) + .add(pos.position()); + } + } + + @Override + public void processElement2(StreamRecord<EqualityConvertPlanResult> record) { + planResult = record.getValue(); + } + + @Override + public void processWatermark(Watermark mark) throws Exception { + if (planResult != null && mark.getTimestamp() >= planResult.doneTimestamp()) { + if (hasUpstreamError) { + output.collect(new StreamRecord<>(DVMergeResult.ABORT)); + } else { + try { + resolveAndWrite(); + } catch (Exception e) { + LOG.error("Error writing DVs for table {} task {}", tableName, taskName, e); + output.collect(TaskResultAggregator.ERROR_STREAM, new StreamRecord<>(e)); + output.collect(new StreamRecord<>(DVMergeResult.ABORT)); + } + } + + positionsByFile.clear(); + hasUpstreamError = false; + planResult = null; + } + + super.processWatermark(mark); + } + + private void resolveAndWrite() throws IOException { + if (positionsByFile.isEmpty()) { + return; + } + + table.refresh(); + + Snapshot mainSnapshot = table.snapshot(targetBranch); + + // Fail fast if the main branch changed since planning, to avoid writing DV files that the + // committer would reject via validateFromSnapshot. The next cycle will reindex. + if (mainSnapshot != null + && planResult.mainSnapshotId() != null + && mainSnapshot.snapshotId() != planResult.mainSnapshotId()) { + throw new IllegalStateException( + "Main branch snapshot changed since planning: expected " + + planResult.mainSnapshotId() + + " but found: " + + mainSnapshot.snapshotId()); + } + + Map<String, PartitionAndSpec> partitions = collectDataFilePartitions(mainSnapshot); + Map<String, DeleteFile> dvs = collectExistingDVs(mainSnapshot); Review Comment: These are listing every data file and every DV in the table? Could cause serious memory pressure - we might want to collect only for the affected data and delete files. Also this is reading the whole stuff in every cycle. Do we need this? Should we cache things? I know this 2 are driving things in different directions. We need to think through this -- This is an automated message from the Apache Git Service. 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