| /** |
| * 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.hadoop.mapred; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.FileUtil; |
| |
| import org.apache.hadoop.io.SequenceFile; |
| import org.apache.hadoop.io.SequenceFile.CompressionType; |
| import org.apache.hadoop.io.compress.CompressionCodec; |
| import org.apache.hadoop.io.compress.DefaultCodec; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.util.*; |
| |
| /** An {@link OutputFormat} that writes {@link SequenceFile}s. |
| * @deprecated Use |
| * {@link org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat} |
| * instead. |
| */ |
| @Deprecated |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class SequenceFileOutputFormat <K,V> extends FileOutputFormat<K, V> { |
| |
| public RecordWriter<K, V> getRecordWriter( |
| FileSystem ignored, JobConf job, |
| String name, Progressable progress) |
| throws IOException { |
| // get the path of the temporary output file |
| Path file = FileOutputFormat.getTaskOutputPath(job, name); |
| |
| FileSystem fs = file.getFileSystem(job); |
| CompressionCodec codec = null; |
| CompressionType compressionType = CompressionType.NONE; |
| if (getCompressOutput(job)) { |
| // find the kind of compression to do |
| compressionType = getOutputCompressionType(job); |
| |
| // find the right codec |
| Class<? extends CompressionCodec> codecClass = getOutputCompressorClass(job, |
| DefaultCodec.class); |
| codec = ReflectionUtils.newInstance(codecClass, job); |
| } |
| final SequenceFile.Writer out = |
| SequenceFile.createWriter(fs, job, file, |
| job.getOutputKeyClass(), |
| job.getOutputValueClass(), |
| compressionType, |
| codec, |
| progress); |
| |
| return new RecordWriter<K, V>() { |
| |
| public void write(K key, V value) |
| throws IOException { |
| |
| out.append(key, value); |
| } |
| |
| public void close(Reporter reporter) throws IOException { out.close();} |
| }; |
| } |
| |
| /** Open the output generated by this format. */ |
| public static SequenceFile.Reader[] getReaders(Configuration conf, Path dir) |
| throws IOException { |
| FileSystem fs = dir.getFileSystem(conf); |
| Path[] names = FileUtil.stat2Paths(fs.listStatus(dir)); |
| |
| // sort names, so that hash partitioning works |
| Arrays.sort(names); |
| |
| SequenceFile.Reader[] parts = new SequenceFile.Reader[names.length]; |
| for (int i = 0; i < names.length; i++) { |
| parts[i] = new SequenceFile.Reader(fs, names[i], conf); |
| } |
| return parts; |
| } |
| |
| /** |
| * Get the {@link CompressionType} for the output {@link SequenceFile}. |
| * @param conf the {@link JobConf} |
| * @return the {@link CompressionType} for the output {@link SequenceFile}, |
| * defaulting to {@link CompressionType#RECORD} |
| */ |
| public static CompressionType getOutputCompressionType(JobConf conf) { |
| String val = conf.get(org.apache.hadoop.mapreduce.lib.output. |
| FileOutputFormat.COMPRESS_TYPE, CompressionType.RECORD.toString()); |
| return CompressionType.valueOf(val); |
| } |
| |
| /** |
| * Set the {@link CompressionType} for the output {@link SequenceFile}. |
| * @param conf the {@link JobConf} to modify |
| * @param style the {@link CompressionType} for the output |
| * {@link SequenceFile} |
| */ |
| public static void setOutputCompressionType(JobConf conf, |
| CompressionType style) { |
| setCompressOutput(conf, true); |
| conf.set(org.apache.hadoop.mapreduce.lib.output. |
| FileOutputFormat.COMPRESS_TYPE, style.toString()); |
| } |
| |
| } |
| |