hadoop InputSplit 源码
haddop InputSplit 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/InputSplit.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;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.io.Writable;
/**
* <code>InputSplit</code> represents the data to be processed by an
* individual {@link Mapper}.
*
* <p>Typically, it presents a byte-oriented view on the input and is the
* responsibility of {@link RecordReader} of the job to process this and present
* a record-oriented view.
*
* @see InputFormat
* @see RecordReader
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public interface InputSplit extends Writable {
/**
* Get the total number of bytes in the data of the <code>InputSplit</code>.
*
* @return the number of bytes in the input split.
* @throws IOException
*/
long getLength() throws IOException;
/**
* Get the list of hostnames where the input split is located.
*
* @return list of hostnames where data of the <code>InputSplit</code> is
* located as an array of <code>String</code>s.
* @throws IOException
*/
String[] getLocations() throws IOException;
}
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