| /* |
| * 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 |
| * |
| * https://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.avro.mapred; |
| |
| import static org.apache.avro.mapred.AvroOutputFormat.EXT; |
| |
| import java.io.IOException; |
| import java.nio.Buffer; |
| import java.nio.ByteBuffer; |
| import java.nio.charset.StandardCharsets; |
| |
| import org.apache.avro.Schema; |
| import org.apache.avro.file.DataFileWriter; |
| import org.apache.avro.reflect.ReflectDatumWriter; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapred.FileOutputFormat; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.RecordWriter; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.hadoop.util.Progressable; |
| |
| /** |
| * The equivalent of {@link org.apache.hadoop.mapred.TextOutputFormat} for |
| * writing to Avro Data Files with a <code>"bytes"</code> schema. |
| */ |
| public class AvroTextOutputFormat<K, V> extends FileOutputFormat<K, V> { |
| |
| @Override |
| public RecordWriter<K, V> getRecordWriter(FileSystem ignore, JobConf job, String name, Progressable prog) |
| throws IOException { |
| |
| Schema schema = Schema.create(Schema.Type.BYTES); |
| |
| final byte[] keyValueSeparator = job.get("mapreduce.output.textoutputformat.separator", "\t") |
| .getBytes(StandardCharsets.UTF_8); |
| |
| final DataFileWriter<ByteBuffer> writer = new DataFileWriter<>(new ReflectDatumWriter<>()); |
| |
| AvroOutputFormat.configureDataFileWriter(writer, job); |
| |
| Path path = FileOutputFormat.getTaskOutputPath(job, name + EXT); |
| writer.create(schema, path.getFileSystem(job).create(path)); |
| |
| return new AvroTextRecordWriter(writer, keyValueSeparator); |
| } |
| |
| class AvroTextRecordWriter implements RecordWriter<K, V> { |
| private final DataFileWriter<ByteBuffer> writer; |
| private final byte[] keyValueSeparator; |
| |
| public AvroTextRecordWriter(DataFileWriter<ByteBuffer> writer, byte[] keyValueSeparator) { |
| this.writer = writer; |
| this.keyValueSeparator = keyValueSeparator; |
| } |
| |
| @Override |
| public void write(K key, V value) throws IOException { |
| boolean nullKey = key == null || key instanceof NullWritable; |
| boolean nullValue = value == null || value instanceof NullWritable; |
| if (nullKey && nullValue) { |
| // NO-OP |
| } else if (!nullKey && nullValue) { |
| writer.append(toByteBuffer(key)); |
| } else if (nullKey && !nullValue) { |
| writer.append(toByteBuffer(value)); |
| } else { |
| writer.append(toByteBuffer(key, keyValueSeparator, value)); |
| } |
| } |
| |
| @Override |
| public void close(Reporter reporter) throws IOException { |
| writer.close(); |
| } |
| |
| private ByteBuffer toByteBuffer(Object o) throws IOException { |
| if (o instanceof Text) { |
| Text to = (Text) o; |
| return ByteBuffer.wrap(to.getBytes(), 0, to.getLength()); |
| } else { |
| return ByteBuffer.wrap(o.toString().getBytes(StandardCharsets.UTF_8)); |
| } |
| } |
| |
| private ByteBuffer toByteBuffer(Object key, byte[] sep, Object value) throws IOException { |
| byte[] keyBytes, valBytes; |
| int keyLength, valLength; |
| if (key instanceof Text) { |
| Text tkey = (Text) key; |
| keyBytes = tkey.getBytes(); |
| keyLength = tkey.getLength(); |
| } else { |
| keyBytes = key.toString().getBytes(StandardCharsets.UTF_8); |
| keyLength = keyBytes.length; |
| } |
| if (value instanceof Text) { |
| Text tval = (Text) value; |
| valBytes = tval.getBytes(); |
| valLength = tval.getLength(); |
| } else { |
| valBytes = value.toString().getBytes(StandardCharsets.UTF_8); |
| valLength = valBytes.length; |
| } |
| ByteBuffer buf = ByteBuffer.allocate(keyLength + sep.length + valLength); |
| buf.put(keyBytes, 0, keyLength); |
| buf.put(sep); |
| buf.put(valBytes, 0, valLength); |
| ((Buffer) buf).rewind(); |
| return buf; |
| } |
| |
| } |
| |
| } |