InputSplit.java
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上传日期:2018-01-08
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- /**
- * 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.mapreduce;
- import java.io.IOException;
- import org.apache.hadoop.mapreduce.InputFormat;
- import org.apache.hadoop.mapreduce.Mapper;
- import org.apache.hadoop.mapreduce.RecordReader;
- /**
- * <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
- */
- public abstract class InputSplit {
- /**
- * Get the size of the split, so that the input splits can be sorted by size.
- * @return the number of bytes in the split
- * @throws IOException
- * @throws InterruptedException
- */
- public abstract long getLength() throws IOException, InterruptedException;
- /**
- * Get the list of nodes by name where the data for the split would be local.
- * The locations do not need to be serialized.
- * @return a new array of the node nodes.
- * @throws IOException
- * @throws InterruptedException
- */
- public abstract
- String[] getLocations() throws IOException, InterruptedException;
- }