spark SparkAvroKeyOutputFormat 源码
spark SparkAvroKeyOutputFormat 代码
文件路径:/connector/avro/src/main/java/org/apache/spark/sql/avro/SparkAvroKeyOutputFormat.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.
*/
package org.apache.spark.sql.avro;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import org.apache.avro.Schema;
import org.apache.avro.file.CodecFactory;
import org.apache.avro.file.DataFileWriter;
import org.apache.avro.generic.GenericData;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.mapred.AvroKey;
import org.apache.avro.mapreduce.AvroKeyOutputFormat;
import org.apache.avro.mapreduce.Syncable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
// A variant of `AvroKeyOutputFormat`, which is used to inject the custom `RecordWriterFactory` so
// that we can set avro file metadata.
class SparkAvroKeyOutputFormat extends AvroKeyOutputFormat<GenericRecord> {
SparkAvroKeyOutputFormat(Map<String, String> metadata) {
super(new SparkRecordWriterFactory(metadata));
}
static class SparkRecordWriterFactory extends RecordWriterFactory<GenericRecord> {
private final Map<String, String> metadata;
SparkRecordWriterFactory(Map<String, String> metadata) {
this.metadata = metadata;
}
@Override
protected RecordWriter<AvroKey<GenericRecord>, NullWritable> create(
Schema writerSchema,
GenericData dataModel,
CodecFactory compressionCodec,
OutputStream outputStream,
int syncInterval) throws IOException {
return new SparkAvroKeyRecordWriter<>(
writerSchema, dataModel, compressionCodec, outputStream, syncInterval, metadata);
}
}
}
// This a fork of org.apache.avro.mapreduce.AvroKeyRecordWriter, in order to set file metadata.
class SparkAvroKeyRecordWriter<T> extends RecordWriter<AvroKey<T>, NullWritable>
implements Syncable {
private final DataFileWriter<T> mAvroFileWriter;
SparkAvroKeyRecordWriter(
Schema writerSchema,
GenericData dataModel,
CodecFactory compressionCodec,
OutputStream outputStream,
int syncInterval,
Map<String, String> metadata) throws IOException {
this.mAvroFileWriter = new DataFileWriter<>(new GenericDatumWriter<>(writerSchema, dataModel));
for (Map.Entry<String, String> entry : metadata.entrySet()) {
this.mAvroFileWriter.setMeta(entry.getKey(), entry.getValue());
}
this.mAvroFileWriter.setCodec(compressionCodec);
this.mAvroFileWriter.setSyncInterval(syncInterval);
this.mAvroFileWriter.create(writerSchema, outputStream);
}
@Override
public void write(AvroKey<T> record, NullWritable ignore) throws IOException {
this.mAvroFileWriter.append(record.datum());
}
@Override
public void close(TaskAttemptContext context) throws IOException {
this.mAvroFileWriter.close();
}
@Override
public long sync() throws IOException {
return this.mAvroFileWriter.sync();
}
}
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