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Flink: Backport apache#8553 to v1.15, v1.16
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Peter Vary
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Nov 23, 2023
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98 changes: 98 additions & 0 deletions
98
...k/src/main/java/org/apache/iceberg/flink/source/reader/ColumnStatsWatermarkExtractor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* | ||
| * 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.source.reader; | ||
|
|
||
| import java.io.Serializable; | ||
| import java.util.Comparator; | ||
| import java.util.concurrent.TimeUnit; | ||
| import org.apache.flink.annotation.Internal; | ||
| import org.apache.iceberg.Schema; | ||
| import org.apache.iceberg.flink.source.split.IcebergSourceSplit; | ||
| import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; | ||
| import org.apache.iceberg.relocated.com.google.common.base.Preconditions; | ||
| import org.apache.iceberg.types.Conversions; | ||
| import org.apache.iceberg.types.Type.TypeID; | ||
| import org.apache.iceberg.types.Types; | ||
|
|
||
| /** | ||
| * {@link SplitWatermarkExtractor} implementation which uses an Iceberg timestamp column statistics | ||
| * to get the watermarks for the {@link IcebergSourceSplit}. This watermark is emitted by the {@link | ||
| * WatermarkExtractorRecordEmitter} along with the actual records. | ||
| */ | ||
| @Internal | ||
| public class ColumnStatsWatermarkExtractor implements SplitWatermarkExtractor, Serializable { | ||
| private final int eventTimeFieldId; | ||
| private final String eventTimeFieldName; | ||
| private final TimeUnit timeUnit; | ||
|
|
||
| /** | ||
| * Creates the extractor. | ||
| * | ||
| * @param schema The schema of the Table | ||
| * @param eventTimeFieldName The column which should be used as an event time | ||
| * @param timeUnit Used for converting the long value to epoch milliseconds | ||
| */ | ||
| public ColumnStatsWatermarkExtractor( | ||
| Schema schema, String eventTimeFieldName, TimeUnit timeUnit) { | ||
| Types.NestedField field = schema.findField(eventTimeFieldName); | ||
| TypeID typeID = field.type().typeId(); | ||
| Preconditions.checkArgument( | ||
| typeID.equals(TypeID.LONG) || typeID.equals(TypeID.TIMESTAMP), | ||
| "Found %s, expected a LONG or TIMESTAMP column for watermark generation.", | ||
| typeID); | ||
| this.eventTimeFieldId = field.fieldId(); | ||
| this.eventTimeFieldName = eventTimeFieldName; | ||
| // Use the timeUnit only for Long columns. | ||
| this.timeUnit = typeID.equals(TypeID.LONG) ? timeUnit : TimeUnit.MICROSECONDS; | ||
| } | ||
|
|
||
| @VisibleForTesting | ||
| ColumnStatsWatermarkExtractor(int eventTimeFieldId, String eventTimeFieldName) { | ||
| this.eventTimeFieldId = eventTimeFieldId; | ||
| this.eventTimeFieldName = eventTimeFieldName; | ||
| this.timeUnit = TimeUnit.MICROSECONDS; | ||
| } | ||
|
|
||
| /** | ||
| * Get the watermark for a split using column statistics. | ||
| * | ||
| * @param split The split | ||
| * @return The watermark | ||
| * @throws IllegalArgumentException if there is no statistics for the column | ||
| */ | ||
| @Override | ||
| public long extractWatermark(IcebergSourceSplit split) { | ||
| return split.task().files().stream() | ||
| .map( | ||
| scanTask -> { | ||
| Preconditions.checkArgument( | ||
| scanTask.file().lowerBounds() != null | ||
| && scanTask.file().lowerBounds().get(eventTimeFieldId) != null, | ||
| "Missing statistics for column name = %s in file = %s", | ||
| eventTimeFieldName, | ||
| eventTimeFieldId, | ||
| scanTask.file()); | ||
| return timeUnit.toMillis( | ||
| Conversions.fromByteBuffer( | ||
| Types.LongType.get(), scanTask.file().lowerBounds().get(eventTimeFieldId))); | ||
| }) | ||
| .min(Comparator.comparingLong(l -> l)) | ||
| .get(); | ||
| } | ||
| } |
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40 changes: 40 additions & 0 deletions
40
...flink/src/main/java/org/apache/iceberg/flink/source/reader/SerializableRecordEmitter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| /* | ||
| * 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.source.reader; | ||
|
|
||
| import java.io.Serializable; | ||
| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.connector.base.source.reader.RecordEmitter; | ||
| import org.apache.iceberg.flink.source.split.IcebergSourceSplit; | ||
|
|
||
| @Internal | ||
| @FunctionalInterface | ||
| public interface SerializableRecordEmitter<T> | ||
| extends RecordEmitter<RecordAndPosition<T>, T, IcebergSourceSplit>, Serializable { | ||
| static <T> SerializableRecordEmitter<T> defaultEmitter() { | ||
| return (element, output, split) -> { | ||
| output.collect(element.record()); | ||
| split.updatePosition(element.fileOffset(), element.recordOffset()); | ||
| }; | ||
| } | ||
|
|
||
| static <T> SerializableRecordEmitter<T> emitterWithWatermark(SplitWatermarkExtractor extractor) { | ||
| return new WatermarkExtractorRecordEmitter<>(extractor); | ||
| } | ||
| } |
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