001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    
019    package org.apache.hadoop.mapred.lib;
020    
021    import java.io.IOException;
022    
023    import org.apache.hadoop.classification.InterfaceAudience;
024    import org.apache.hadoop.classification.InterfaceStability;
025    import org.apache.hadoop.fs.FileSystem;
026    import org.apache.hadoop.mapred.JobConf;
027    import org.apache.hadoop.mapred.RecordWriter;
028    import org.apache.hadoop.mapred.SequenceFileOutputFormat;
029    import org.apache.hadoop.util.Progressable;
030    
031    /**
032     * This class extends the MultipleOutputFormat, allowing to write the output data 
033     * to different output files in sequence file output format. 
034     */
035    @InterfaceAudience.Public
036    @InterfaceStability.Stable
037    public class MultipleSequenceFileOutputFormat <K,V>
038    extends MultipleOutputFormat<K, V> {
039    
040        private SequenceFileOutputFormat<K,V> theSequenceFileOutputFormat = null;
041      
042      @Override
043      protected RecordWriter<K, V> getBaseRecordWriter(FileSystem fs,
044                                                       JobConf job,
045                                                       String name,
046                                                       Progressable arg3) 
047      throws IOException {
048        if (theSequenceFileOutputFormat == null) {
049          theSequenceFileOutputFormat = new SequenceFileOutputFormat<K,V>();
050        }
051        return theSequenceFileOutputFormat.getRecordWriter(fs, job, name, arg3);
052      }
053    }