1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | |
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19 | package org.apache.hadoop.mapreduce; |
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20 | |
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21 | import java.io.IOException; |
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22 | |
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23 | import org.apache.hadoop.mapreduce.InputFormat; |
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24 | import org.apache.hadoop.mapreduce.Mapper; |
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25 | import org.apache.hadoop.mapreduce.RecordReader; |
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26 | |
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27 | /** |
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28 | * <code>InputSplit</code> represents the data to be processed by an |
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29 | * individual {@link Mapper}. |
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30 | * |
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31 | * <p>Typically, it presents a byte-oriented view on the input and is the |
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32 | * responsibility of {@link RecordReader} of the job to process this and present |
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33 | * a record-oriented view. |
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34 | * |
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35 | * @see InputFormat |
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36 | * @see RecordReader |
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37 | */ |
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38 | public abstract class InputSplit { |
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39 | /** |
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40 | * Get the size of the split, so that the input splits can be sorted by size. |
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41 | * @return the number of bytes in the split |
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42 | * @throws IOException |
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43 | * @throws InterruptedException |
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44 | */ |
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45 | public abstract long getLength() throws IOException, InterruptedException; |
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46 | |
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47 | /** |
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48 | * Get the list of nodes by name where the data for the split would be local. |
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49 | * The locations do not need to be serialized. |
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50 | * @return a new array of the node nodes. |
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51 | * @throws IOException |
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52 | * @throws InterruptedException |
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53 | */ |
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54 | public abstract |
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55 | String[] getLocations() throws IOException, InterruptedException; |
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56 | } |
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