| /** |
| * 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 org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.BytesWritable; |
| 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.util.ReflectionUtils; |
| import org.apache.hadoop.util.Progressable; |
| |
| /** |
| * An {@link OutputFormat} that writes keys, values to |
| * {@link SequenceFile}s in binary(raw) format |
| * |
| * @deprecated Use |
| * {@link org.apache.hadoop.mapreduce.lib.output.SequenceFileAsBinaryOutputFormat} |
| * instead |
| */ |
| @Deprecated |
| public class SequenceFileAsBinaryOutputFormat |
| extends SequenceFileOutputFormat <BytesWritable,BytesWritable> { |
| |
| /** |
| * Inner class used for appendRaw |
| */ |
| static protected class WritableValueBytes extends org.apache.hadoop.mapreduce |
| .lib.output.SequenceFileAsBinaryOutputFormat.WritableValueBytes { |
| } |
| |
| /** |
| * Set the key class for the {@link SequenceFile} |
| * <p>This allows the user to specify the key class to be different |
| * from the actual class ({@link BytesWritable}) used for writing </p> |
| * |
| * @param conf the {@link JobConf} to modify |
| * @param theClass the SequenceFile output key class. |
| */ |
| static public void setSequenceFileOutputKeyClass(JobConf conf, |
| Class<?> theClass) { |
| conf.setClass(org.apache.hadoop.mapreduce.lib.output. |
| SequenceFileAsBinaryOutputFormat.KEY_CLASS, theClass, Object.class); |
| } |
| |
| /** |
| * Set the value class for the {@link SequenceFile} |
| * <p>This allows the user to specify the value class to be different |
| * from the actual class ({@link BytesWritable}) used for writing </p> |
| * |
| * @param conf the {@link JobConf} to modify |
| * @param theClass the SequenceFile output key class. |
| */ |
| static public void setSequenceFileOutputValueClass(JobConf conf, |
| Class<?> theClass) { |
| conf.setClass(org.apache.hadoop.mapreduce.lib.output. |
| SequenceFileAsBinaryOutputFormat.VALUE_CLASS, theClass, Object.class); |
| } |
| |
| /** |
| * Get the key class for the {@link SequenceFile} |
| * |
| * @return the key class of the {@link SequenceFile} |
| */ |
| static public Class<? extends WritableComparable> getSequenceFileOutputKeyClass(JobConf conf) { |
| return conf.getClass(org.apache.hadoop.mapreduce.lib.output. |
| SequenceFileAsBinaryOutputFormat.KEY_CLASS, |
| conf.getOutputKeyClass().asSubclass(WritableComparable.class), |
| WritableComparable.class); |
| } |
| |
| /** |
| * Get the value class for the {@link SequenceFile} |
| * |
| * @return the value class of the {@link SequenceFile} |
| */ |
| static public Class<? extends Writable> getSequenceFileOutputValueClass(JobConf conf) { |
| return conf.getClass(org.apache.hadoop.mapreduce.lib.output. |
| SequenceFileAsBinaryOutputFormat.VALUE_CLASS, |
| conf.getOutputValueClass().asSubclass(Writable.class), Writable.class); |
| } |
| |
| @Override |
| public RecordWriter <BytesWritable, BytesWritable> |
| 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, |
| getSequenceFileOutputKeyClass(job), |
| getSequenceFileOutputValueClass(job), |
| compressionType, |
| codec, |
| progress); |
| |
| return new RecordWriter<BytesWritable, BytesWritable>() { |
| |
| private WritableValueBytes wvaluebytes = new WritableValueBytes(); |
| |
| public void write(BytesWritable bkey, BytesWritable bvalue) |
| throws IOException { |
| |
| wvaluebytes.reset(bvalue); |
| out.appendRaw(bkey.getBytes(), 0, bkey.getLength(), wvaluebytes); |
| wvaluebytes.reset(null); |
| } |
| |
| public void close(Reporter reporter) throws IOException { |
| out.close(); |
| } |
| |
| }; |
| |
| } |
| |
| @Override |
| public void checkOutputSpecs(FileSystem ignored, JobConf job) |
| throws IOException { |
| super.checkOutputSpecs(ignored, job); |
| if (getCompressOutput(job) && |
| getOutputCompressionType(job) == CompressionType.RECORD ){ |
| throw new InvalidJobConfException("SequenceFileAsBinaryOutputFormat " |
| + "doesn't support Record Compression" ); |
| } |
| |
| } |
| |
| } |