AHeise commented on a change in pull request #17501: URL: https://github.com/apache/flink/pull/17501#discussion_r768387795
########## File path: flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/avro/AvroParquetRecordFormat.java ########## @@ -0,0 +1,236 @@ +/* + * 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.formats.parquet.avro; + +import org.apache.flink.annotation.VisibleForTesting; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.configuration.Configuration; +import org.apache.flink.connector.file.src.reader.StreamFormat; +import org.apache.flink.connector.file.src.util.CheckpointedPosition; +import org.apache.flink.core.fs.FSDataInputStream; + +import org.apache.avro.generic.GenericData; +import org.apache.avro.generic.GenericRecord; +import org.apache.avro.reflect.ReflectData; +import org.apache.avro.specific.SpecificData; +import org.apache.parquet.avro.AvroParquetReader; +import org.apache.parquet.hadoop.ParquetReader; +import org.apache.parquet.io.DelegatingSeekableInputStream; +import org.apache.parquet.io.InputFile; +import org.apache.parquet.io.SeekableInputStream; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.annotation.Nullable; + +import java.io.IOException; + +import static org.apache.flink.util.Preconditions.checkArgument; + +/** */ +public class AvroParquetRecordFormat<E> implements StreamFormat<E> { + + private static final long serialVersionUID = 1L; + + static final Logger LOG = LoggerFactory.getLogger(AvroParquetRecordFormat.class); + + private final TypeInformation<E> type; + + AvroParquetRecordFormat(TypeInformation<E> type) { + this.type = type; + } + + /** + * Creates a new reader to read avro {@link GenericRecord} from Parquet input stream. + * + * <p>Several wrapper classes haven be created to Flink abstraction become compatible with the + * parquet abstraction. Please refer to the inner classes {@link AvroParquetRecordReader}, + * {@link ParquetInputFile}, {@link FSDataInputStreamAdapter} for details. + */ + @Override + public Reader<E> createReader( + Configuration config, FSDataInputStream stream, long fileLen, long splitEnd) + throws IOException { + + // current version does not support splitting. + checkNotSplit(fileLen, splitEnd); + + return new AvroParquetRecordReader<E>( + AvroParquetReader.<E>builder(new ParquetInputFile(stream, fileLen)) + .withDataModel(getDataModel()) + .build()); + } + + /** + * Restores the reader from a checkpointed position. It is in fact identical since only {@link + * CheckpointedPosition#NO_OFFSET} as the {@code restoredOffset} is support. + */ + @Override + public Reader<E> restoreReader( + Configuration config, + FSDataInputStream stream, + long restoredOffset, + long fileLen, + long splitEnd) + throws IOException { + + // current version does not support splitting. + checkNotSplit(fileLen, splitEnd); + + checkArgument( + restoredOffset == CheckpointedPosition.NO_OFFSET, + "The restoredOffset should always be NO_OFFSET"); + + return createReader(config, stream, fileLen, splitEnd); + } + + @VisibleForTesting + GenericData getDataModel() { + Class<E> typeClass = getProducedType().getTypeClass(); + if (org.apache.avro.specific.SpecificRecordBase.class.isAssignableFrom(typeClass)) { + return SpecificData.get(); + } else if (org.apache.avro.generic.GenericRecord.class.isAssignableFrom(typeClass)) { + return GenericData.get(); + } else { + return ReflectData.get(); + } + } + + /** Current version does not support splitting. */ + @Override + public boolean isSplittable() { + return false; + } + + /** + * Gets the type produced by this format. This type will be the type produced by the file source + * as a whole. + */ + @Override + public TypeInformation<E> getProducedType() { + return type; + } + + private static void checkNotSplit(long fileLen, long splitEnd) { + if (splitEnd != fileLen) { + throw new IllegalArgumentException( + String.format( + "Current version of AvroParquetRecordFormat is not splittable, " + + "but found split end (%d) different from file length (%d)", + splitEnd, fileLen)); + } + } + + /** + * {@link StreamFormat.Reader} implementation. Using {@link ParquetReader} internally to read + * avro {@link GenericRecord} from parquet {@link InputFile}. + */ + private static class AvroParquetRecordReader<E> implements StreamFormat.Reader<E> { + + private final ParquetReader<E> parquetReader; + + private final long offset; Review comment: Then we should remove the offset here and rather use the constant where applicable. -- This is an automated message from the Apache Git Service. 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