dawidwys commented on code in PR #27502: URL: https://github.com/apache/flink/pull/27502#discussion_r2763882305
########## flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/operators/sink/WatermarkCompactingSinkMaterializer.java: ########## @@ -0,0 +1,341 @@ +/* + * 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.flink.table.runtime.operators.sink; + +import org.apache.flink.api.common.state.MapState; +import org.apache.flink.api.common.state.MapStateDescriptor; +import org.apache.flink.api.common.state.ValueState; +import org.apache.flink.api.common.state.ValueStateDescriptor; +import org.apache.flink.api.common.typeutils.TypeSerializer; +import org.apache.flink.api.common.typeutils.base.ListSerializer; +import org.apache.flink.api.common.typeutils.base.LongSerializer; +import org.apache.flink.runtime.state.KeyedStateBackend; +import org.apache.flink.runtime.state.VoidNamespace; +import org.apache.flink.runtime.state.VoidNamespaceSerializer; +import org.apache.flink.streaming.api.operators.OneInputStreamOperator; +import org.apache.flink.streaming.api.operators.TimestampedCollector; +import org.apache.flink.streaming.api.watermark.Watermark; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.flink.table.api.InsertConflictStrategy; +import org.apache.flink.table.api.InsertConflictStrategy.ConflictBehavior; +import org.apache.flink.table.api.TableRuntimeException; +import org.apache.flink.table.data.RowData; +import org.apache.flink.table.data.utils.ProjectedRowData; +import org.apache.flink.table.runtime.generated.GeneratedRecordEqualiser; +import org.apache.flink.table.runtime.generated.RecordEqualiser; +import org.apache.flink.table.runtime.operators.TableStreamOperator; +import org.apache.flink.table.runtime.typeutils.InternalSerializers; +import org.apache.flink.table.types.logical.RowType; +import org.apache.flink.types.RowKind; +import org.apache.flink.util.Preconditions; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.annotation.Nullable; + +import java.util.ArrayList; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Set; + +import static org.apache.flink.types.RowKind.DELETE; +import static org.apache.flink.types.RowKind.INSERT; +import static org.apache.flink.types.RowKind.UPDATE_AFTER; + +/** + * A sink materializer that buffers records and compacts them on watermark progression. + * + * <p>This operator implements the watermark-based compaction algorithm from FLIP-558 for handling + * changelog disorder when the upsert key differs from the sink's primary key. + */ +public class WatermarkCompactingSinkMaterializer extends TableStreamOperator<RowData> + implements OneInputStreamOperator<RowData, RowData> { + + private static final long serialVersionUID = 1L; + + private static final Logger LOG = + LoggerFactory.getLogger(WatermarkCompactingSinkMaterializer.class); + + private static final String STATE_CLEARED_WARN_MSG = + "The state is cleared because of state ttl. This will result in incorrect result. " + + "You can increase the state ttl to avoid this."; + private static final Set<String> ORDERED_STATE_BACKENDS = Set.of("rocksdb", "forst"); + + private final InsertConflictStrategy conflictStrategy; + private final TypeSerializer<RowData> serializer; + private final GeneratedRecordEqualiser generatedRecordEqualiser; + private final GeneratedRecordEqualiser generatedUpsertKeyEqualiser; + private final int[] inputUpsertKey; + private final boolean hasUpsertKey; + + private transient MapStateDescriptor<Long, List<RowData>> bufferDescriptor; + private transient MapState<Long, List<RowData>> buffer; + private transient ValueState<RowData> currentValue; + private transient RecordEqualiser equaliser; + private transient RecordEqualiser upsertKeyEqualiser; + private transient TimestampedCollector<RowData> collector; + private transient boolean isOrderedStateBackend; + + // Reused ProjectedRowData for comparing upsertKey if hasUpsertKey. + private transient ProjectedRowData upsertKeyProjectedRow1; + private transient ProjectedRowData upsertKeyProjectedRow2; + + public WatermarkCompactingSinkMaterializer( + InsertConflictStrategy conflictStrategy, + TypeSerializer<RowData> serializer, + GeneratedRecordEqualiser generatedRecordEqualiser, + @Nullable GeneratedRecordEqualiser generatedUpsertKeyEqualiser, + @Nullable int[] inputUpsertKey) { + validateConflictStrategy(conflictStrategy); + this.conflictStrategy = conflictStrategy; + this.serializer = serializer; + this.generatedRecordEqualiser = generatedRecordEqualiser; + this.generatedUpsertKeyEqualiser = generatedUpsertKeyEqualiser; + this.inputUpsertKey = inputUpsertKey; + this.hasUpsertKey = inputUpsertKey != null && inputUpsertKey.length > 0; + } + + private static void validateConflictStrategy(InsertConflictStrategy strategy) { + Preconditions.checkArgument( + strategy.getBehavior() == ConflictBehavior.ERROR + || strategy.getBehavior() == ConflictBehavior.NOTHING, + "Only ERROR and NOTHING strategies are supported, got: %s", + strategy); + } + + @Override + public void open() throws Exception { + super.open(); + initializeEqualisers(); + detectOrderedStateBackend(); + initializeState(); + this.collector = new TimestampedCollector<>(output); + } + + private void initializeEqualisers() { + if (hasUpsertKey) { + this.upsertKeyEqualiser = + generatedUpsertKeyEqualiser.newInstance( + getRuntimeContext().getUserCodeClassLoader()); + upsertKeyProjectedRow1 = ProjectedRowData.from(inputUpsertKey); + upsertKeyProjectedRow2 = ProjectedRowData.from(inputUpsertKey); + } + this.equaliser = + generatedRecordEqualiser.newInstance(getRuntimeContext().getUserCodeClassLoader()); + } + + private void detectOrderedStateBackend() { + KeyedStateBackend<?> keyedStateBackend = getKeyedStateBackend(); + String backendType = + keyedStateBackend != null ? keyedStateBackend.getBackendTypeIdentifier() : ""; + this.isOrderedStateBackend = ORDERED_STATE_BACKENDS.contains(backendType); + + if (isOrderedStateBackend) { + LOG.info("Using ordered state backend optimization for {} backend", backendType); + } + } + + private void initializeState() { + this.bufferDescriptor = + new MapStateDescriptor<>( + "watermark-buffer", + LongSerializer.INSTANCE, + new ListSerializer<>(serializer)); + this.buffer = getRuntimeContext().getMapState(bufferDescriptor); + + ValueStateDescriptor<RowData> currentValueDescriptor = + new ValueStateDescriptor<>("current-value", serializer); + this.currentValue = getRuntimeContext().getState(currentValueDescriptor); + } + + @Override + public void processElement(StreamRecord<RowData> element) throws Exception { + RowData row = element.getValue(); + long assignedTimestamp = element.getTimestamp(); + bufferRecord(assignedTimestamp, row); + } + + private void bufferRecord(long timestamp, RowData row) throws Exception { + List<RowData> records = buffer.get(timestamp); + if (records == null) { + records = new ArrayList<>(); + } + records.add(row); + buffer.put(timestamp, records); + } + + @Override + public void processWatermark(Watermark mark) throws Exception { + final long watermarkTimestamp = mark.getTimestamp(); + + // Iterate over all keys and compact their buffered records + this.<RowData>getKeyedStateBackend() + .applyToAllKeys( + VoidNamespace.INSTANCE, + VoidNamespaceSerializer.INSTANCE, + bufferDescriptor, + (key, state) -> compactAndEmit(watermarkTimestamp)); + + super.processWatermark(mark); + } + + private void compactAndEmit(long newWatermark) throws Exception { + RowData previousValue = currentValue.value(); + List<RowData> pendingRecords = collectPendingRecords(previousValue, newWatermark); + + if (pendingRecords.size() > 1) { + if (conflictStrategy.getBehavior() == ConflictBehavior.ERROR) { + throw new TableRuntimeException( + "Primary key constraint violation: multiple distinct records with " + + "the same primary key detected. Use ON CONFLICT DO NOTHING " + + "to keep the first record."); + } else if (previousValue == null) { + final RowData newValue = pendingRecords.get(0); + emit(newValue, INSERT); + currentValue.update(newValue); + } + } else if (pendingRecords.isEmpty()) { + if (previousValue != null) { + emit(previousValue, DELETE); + currentValue.clear(); + } + } else { + final RowData newValue = pendingRecords.get(0); + if (previousValue == null) { + emit(newValue, INSERT); + currentValue.update(newValue); + } else if (!recordEquals(previousValue, newValue)) { + emit(newValue, UPDATE_AFTER); + currentValue.update(newValue); + } + } + } + + private List<RowData> collectPendingRecords(RowData previousValue, long newWatermark) + throws Exception { + List<RowData> records = new ArrayList<>(); + if (previousValue != null) { + records.add(previousValue); + } + Iterator<Map.Entry<Long, List<RowData>>> iterator = buffer.entries().iterator(); + + while (iterator.hasNext()) { + Map.Entry<Long, List<RowData>> entry = iterator.next(); + if (entry.getKey() <= newWatermark) { + for (RowData pendingRecord : entry.getValue()) { + switch (pendingRecord.getRowKind()) { + case INSERT: + case UPDATE_AFTER: + addRow(records, pendingRecord); + break; + + case UPDATE_BEFORE: + case DELETE: + retractRow(records, pendingRecord); + break; + } + } + iterator.remove(); + } else if (isOrderedStateBackend) { Review Comment: I used the same pattern as is used for timers now. -- This is an automated message from the Apache Git Service. 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