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[FLINK-24565][avro] Port avro file format factory to BulkReaderFormat…
…Factory
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...ormats/flink-avro/src/main/java/org/apache/flink/formats/avro/AbstractAvroBulkFormat.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.formats.avro; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.configuration.Configuration; | ||
| import org.apache.flink.connector.file.src.FileSourceSplit; | ||
| import org.apache.flink.connector.file.src.reader.BulkFormat; | ||
| import org.apache.flink.connector.file.src.util.CheckpointedPosition; | ||
| import org.apache.flink.connector.file.src.util.IteratorResultIterator; | ||
| import org.apache.flink.connector.file.src.util.Pool; | ||
| import org.apache.flink.core.fs.FileSystem; | ||
| import org.apache.flink.core.fs.Path; | ||
| import org.apache.flink.formats.avro.utils.FSDataInputStreamWrapper; | ||
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| import org.apache.avro.Schema; | ||
| import org.apache.avro.file.DataFileReader; | ||
| import org.apache.avro.file.SeekableInput; | ||
| import org.apache.avro.generic.GenericDatumReader; | ||
| import org.apache.avro.io.DatumReader; | ||
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| import javax.annotation.Nullable; | ||
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| import java.io.IOException; | ||
| import java.util.Iterator; | ||
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| /** Provides a {@link BulkFormat} for Avro records. */ | ||
| @Internal | ||
| public abstract class AbstractAvroBulkFormat<A, T, SplitT extends FileSourceSplit> | ||
| implements BulkFormat<T, SplitT> { | ||
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| private static final long serialVersionUID = 1L; | ||
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| protected final Schema readerSchema; | ||
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| protected AbstractAvroBulkFormat(Schema readerSchema) { | ||
| this.readerSchema = readerSchema; | ||
| } | ||
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| @Override | ||
| public AvroReader createReader(Configuration config, SplitT split) throws IOException { | ||
| open(split); | ||
| return createReader(split); | ||
| } | ||
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| @Override | ||
| public AvroReader restoreReader(Configuration config, SplitT split) throws IOException { | ||
| open(split); | ||
| return createReader(split); | ||
| } | ||
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| @Override | ||
| public boolean isSplittable() { | ||
| return true; | ||
| } | ||
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| private AvroReader createReader(SplitT split) throws IOException { | ||
| long end = split.offset() + split.length(); | ||
| if (split.getReaderPosition().isPresent()) { | ||
| CheckpointedPosition position = split.getReaderPosition().get(); | ||
| return new AvroReader( | ||
| split.path(), | ||
| split.offset(), | ||
| end, | ||
| position.getOffset(), | ||
| position.getRecordsAfterOffset()); | ||
| } else { | ||
| return new AvroReader(split.path(), split.offset(), end, -1, 0); | ||
| } | ||
| } | ||
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| protected void open(SplitT split) {} | ||
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| protected abstract T convert(A record); | ||
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| protected abstract A createReusedAvroRecord(); | ||
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| private class AvroReader implements BulkFormat.Reader<T> { | ||
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| private final DataFileReader<A> reader; | ||
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| private final long end; | ||
| private final Pool<A> pool; | ||
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| private long currentBlockStart; | ||
| private long currentRecordsToSkip; | ||
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| private AvroReader(Path path, long offset, long end, long blockStart, long recordsToSkip) | ||
| throws IOException { | ||
| A reuse = createReusedAvroRecord(); | ||
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| this.reader = createReaderFromPath(path); | ||
| if (blockStart >= 0) { | ||
| reader.seek(blockStart); | ||
| } else { | ||
| reader.sync(offset); | ||
| } | ||
| for (int i = 0; i < recordsToSkip; i++) { | ||
| reader.next(reuse); | ||
| } | ||
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| this.end = end; | ||
| this.pool = new Pool<>(1); | ||
| this.pool.add(reuse); | ||
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| this.currentBlockStart = reader.previousSync(); | ||
| this.currentRecordsToSkip = recordsToSkip; | ||
| } | ||
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| private DataFileReader<A> createReaderFromPath(Path path) throws IOException { | ||
| FileSystem fileSystem = path.getFileSystem(); | ||
| DatumReader<A> datumReader = new GenericDatumReader<>(null, readerSchema); | ||
| SeekableInput in = | ||
| new FSDataInputStreamWrapper( | ||
| fileSystem.open(path), fileSystem.getFileStatus(path).getLen()); | ||
| return (DataFileReader<A>) DataFileReader.openReader(in, datumReader); | ||
| } | ||
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| @Nullable | ||
| @Override | ||
| public RecordIterator<T> readBatch() throws IOException { | ||
| A reuse; | ||
| try { | ||
| reuse = pool.pollEntry(); | ||
| } catch (InterruptedException e) { | ||
| Thread.currentThread().interrupt(); | ||
| throw new RuntimeException( | ||
| "Interrupted while waiting for the previous batch to be consumed", e); | ||
| } | ||
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| if (!readNextBlock()) { | ||
| pool.recycler().recycle(reuse); | ||
| return null; | ||
| } | ||
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| currentBlockStart = reader.previousSync(); | ||
| Iterator<T> iterator = | ||
| new AvroBlockIterator( | ||
| reader.getBlockCount() - currentRecordsToSkip, reader, reuse); | ||
| long recordsToSkip = currentRecordsToSkip; | ||
| currentRecordsToSkip = 0; | ||
| return new IteratorResultIterator<>( | ||
| iterator, | ||
| currentBlockStart, | ||
| recordsToSkip, | ||
| () -> pool.recycler().recycle(reuse)); | ||
| } | ||
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| private boolean readNextBlock() throws IOException { | ||
| // read the next block with reader, | ||
| // returns true if a block is read and false if we reach the end of this split | ||
| return reader.hasNext() && !reader.pastSync(end); | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| reader.close(); | ||
| } | ||
| } | ||
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| private class AvroBlockIterator implements Iterator<T> { | ||
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| private long numRecordsRemaining; | ||
| private final DataFileReader<A> reader; | ||
| private final A reuse; | ||
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| private AvroBlockIterator(long numRecordsRemaining, DataFileReader<A> reader, A reuse) { | ||
| this.numRecordsRemaining = numRecordsRemaining; | ||
| this.reader = reader; | ||
| this.reuse = reuse; | ||
| } | ||
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| @Override | ||
| public boolean hasNext() { | ||
| return numRecordsRemaining > 0; | ||
| } | ||
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| @Override | ||
| public T next() { | ||
| try { | ||
| numRecordsRemaining--; | ||
| // reader.next merely deserialize bytes in memory to java objects | ||
| // and will not read from file | ||
| return convert(reader.next(reuse)); | ||
| } catch (IOException e) { | ||
| throw new RuntimeException( | ||
| "Encountered exception when reading from avro format file", e); | ||
| } | ||
| } | ||
| } | ||
| } |
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