Java tutorial
/** * 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; }