hadoop MultipleSequenceFileOutputFormat 源码
haddop MultipleSequenceFileOutputFormat 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/lib/MultipleSequenceFileOutputFormat.java
/**
* 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.lib;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.mapred.SequenceFileOutputFormat;
import org.apache.hadoop.util.Progressable;
/**
* This class extends the MultipleOutputFormat, allowing to write the output data
* to different output files in sequence file output format.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class MultipleSequenceFileOutputFormat <K,V>
extends MultipleOutputFormat<K, V> {
private SequenceFileOutputFormat<K,V> theSequenceFileOutputFormat = null;
@Override
protected RecordWriter<K, V> getBaseRecordWriter(FileSystem fs,
JobConf job,
String name,
Progressable arg3)
throws IOException {
if (theSequenceFileOutputFormat == null) {
theSequenceFileOutputFormat = new SequenceFileOutputFormat<K,V>();
}
return theSequenceFileOutputFormat.getRecordWriter(fs, job, name, arg3);
}
}
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