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| <div class="subTitle">org.apache.hadoop.mapreduce</div> |
| <h2 title="Class Mapper" class="title">Class Mapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT></h2> |
| </div> |
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| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.mapreduce.Mapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT></li> |
| </ul> |
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| <div class="description"> |
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| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../org/apache/hadoop/mapreduce/lib/chain/ChainMapper.html" title="class in org.apache.hadoop.mapreduce.lib.chain">ChainMapper</a>, <a href="../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html" title="class in org.apache.hadoop.mapreduce.lib.fieldsel">FieldSelectionMapper</a>, <a href="../../../../org/apache/hadoop/mapreduce/lib/map/InverseMapper.html" title="class in org.apache.hadoop.mapreduce.lib.map">InverseMapper</a>, <a href="../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html" title="class in org.apache.hadoop.mapreduce.lib.map">MultithreadedMapper</a>, <a href="../../../../org/apache/hadoop/mapreduce/lib/map/RegexMapper.html" title="class in org.apache.hadoop.mapreduce.lib.map">RegexMapper</a>, <a href="../../../../org/apache/hadoop/mapreduce/lib/map/TokenCounterMapper.html" title="class in org.apache.hadoop.mapreduce.lib.map">TokenCounterMapper</a>, <a href="../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorMapper.html" title="class in org.apache.hadoop.mapreduce.lib.aggregate">ValueAggregatorMapper</a>, <a href="../../../../org/apache/hadoop/mapreduce/lib/map/WrappedMapper.html" title="class in org.apache.hadoop.mapreduce.lib.map">WrappedMapper</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">Mapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT></span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Maps input key/value pairs to a set of intermediate key/value pairs. |
| |
| <p>Maps are the individual tasks which transform input records into a |
| intermediate records. The transformed intermediate records need not be of |
| the same type as the input records. A given input pair may map to zero or |
| many output pairs.</p> |
| |
| <p>The Hadoop Map-Reduce framework spawns one map task for each |
| <a href="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce"><code>InputSplit</code></a> generated by the <a href="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="class in org.apache.hadoop.mapreduce"><code>InputFormat</code></a> for the job. |
| <code>Mapper</code> implementations can access the <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf"><code>Configuration</code></a> for |
| the job via the <a href="../../../../org/apache/hadoop/mapreduce/JobContext.html#getConfiguration--"><code>JobContext.getConfiguration()</code></a>. |
| |
| <p>The framework first calls |
| <a href="../../../../org/apache/hadoop/mapreduce/Mapper.html#setup-org.apache.hadoop.mapreduce.Mapper.Context-"><code>setup(org.apache.hadoop.mapreduce.Mapper.Context)</code></a>, followed by |
| <a href="../../../../org/apache/hadoop/mapreduce/Mapper.html#map-KEYIN-VALUEIN-org.apache.hadoop.mapreduce.Mapper.Context-"><code>map(Object, Object, org.apache.hadoop.mapreduce.Mapper.Context)</code></a> |
| for each key/value pair in the <code>InputSplit</code>. Finally |
| <a href="../../../../org/apache/hadoop/mapreduce/Mapper.html#cleanup-org.apache.hadoop.mapreduce.Mapper.Context-"><code>cleanup(org.apache.hadoop.mapreduce.Mapper.Context)</code></a> is called.</p> |
| |
| <p>All intermediate values associated with a given output key are |
| subsequently grouped by the framework, and passed to a <a href="../../../../org/apache/hadoop/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce"><code>Reducer</code></a> to |
| determine the final output. Users can control the sorting and grouping by |
| specifying two key <a href="../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io"><code>RawComparator</code></a> classes.</p> |
| |
| <p>The <code>Mapper</code> outputs are partitioned per |
| <code>Reducer</code>. Users can control which keys (and hence records) go to |
| which <code>Reducer</code> by implementing a custom <a href="../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce"><code>Partitioner</code></a>. |
| |
| <p>Users can optionally specify a <code>combiner</code>, via |
| <a href="../../../../org/apache/hadoop/mapreduce/Job.html#setCombinerClass-java.lang.Class-"><code>Job.setCombinerClass(Class)</code></a>, to perform local aggregation of the |
| intermediate outputs, which helps to cut down the amount of data transferred |
| from the <code>Mapper</code> to the <code>Reducer</code>. |
| |
| <p>Applications can specify if and how the intermediate |
| outputs are to be compressed and which <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress"><code>CompressionCodec</code></a>s are to be |
| used via the <code>Configuration</code>.</p> |
| |
| <p>If the job has zero |
| reduces then the output of the <code>Mapper</code> is directly written |
| to the <a href="../../../../org/apache/hadoop/mapreduce/OutputFormat.html" title="class in org.apache.hadoop.mapreduce"><code>OutputFormat</code></a> without sorting by keys.</p> |
| |
| <p>Example:</p> |
| <p><blockquote><pre> |
| public class TokenCounterMapper |
| extends Mapper<Object, Text, Text, IntWritable>{ |
| |
| private final static IntWritable one = new IntWritable(1); |
| private Text word = new Text(); |
| |
| public void map(Object key, Text value, Context context) throws IOException, InterruptedException { |
| StringTokenizer itr = new StringTokenizer(value.toString()); |
| while (itr.hasMoreTokens()) { |
| word.set(itr.nextToken()); |
| context.write(word, one); |
| } |
| } |
| } |
| </pre></blockquote> |
| |
| <p>Applications may override the |
| <a href="../../../../org/apache/hadoop/mapreduce/Mapper.html#run-org.apache.hadoop.mapreduce.Mapper.Context-"><code>run(org.apache.hadoop.mapreduce.Mapper.Context)</code></a> method to exert |
| greater control on map processing e.g. multi-threaded <code>Mapper</code>s |
| etc.</p></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="class in org.apache.hadoop.mapreduce"><code>InputFormat</code></a>, |
| <a href="../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce"><code>JobContext</code></a>, |
| <a href="../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce"><code>Partitioner</code></a>, |
| <a href="../../../../org/apache/hadoop/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce"><code>Reducer</code></a></dd> |
| </dl> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapreduce/Mapper.html#Mapper--">Mapper</a></span>()</code> </td> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapreduce/Mapper.html#cleanup-org.apache.hadoop.mapreduce.Mapper.Context-">cleanup</a></span>(org.apache.hadoop.mapreduce.Mapper.Context context)</code> |
| <div class="block">Called once at the end of the task.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapreduce/Mapper.html#map-KEYIN-VALUEIN-org.apache.hadoop.mapreduce.Mapper.Context-">map</a></span>(<a href="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="type parameter in Mapper">KEYIN</a> key, |
| <a href="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="type parameter in Mapper">VALUEIN</a> value, |
| org.apache.hadoop.mapreduce.Mapper.Context context)</code> |
| <div class="block">Called once for each key/value pair in the input split.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapreduce/Mapper.html#run-org.apache.hadoop.mapreduce.Mapper.Context-">run</a></span>(org.apache.hadoop.mapreduce.Mapper.Context context)</code> |
| <div class="block">Expert users can override this method for more complete control over the |
| execution of the Mapper.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapreduce/Mapper.html#setup-org.apache.hadoop.mapreduce.Mapper.Context-">setup</a></span>(org.apache.hadoop.mapreduce.Mapper.Context context)</code> |
| <div class="block">Called once at the beginning of the task.</div> |
| </td> |
| </tr> |
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| <h3>Constructor Detail</h3> |
| <a name="Mapper--"> |
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| <h4>Mapper</h4> |
| <pre>public Mapper()</pre> |
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| <a name="setup-org.apache.hadoop.mapreduce.Mapper.Context-"> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setup</h4> |
| <pre>protected void setup(org.apache.hadoop.mapreduce.Mapper.Context context) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block">Called once at the beginning of the task.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="map-java.lang.Object-java.lang.Object-org.apache.hadoop.mapreduce.Mapper.Context-"> |
| <!-- --> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>map</h4> |
| <pre>protected void map(<a href="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="type parameter in Mapper">KEYIN</a> key, |
| <a href="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="type parameter in Mapper">VALUEIN</a> value, |
| org.apache.hadoop.mapreduce.Mapper.Context context) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block">Called once for each key/value pair in the input split. Most applications |
| should override this, but the default is the identity function.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code></dd> |
| </dl> |
| </li> |
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| <a name="cleanup-org.apache.hadoop.mapreduce.Mapper.Context-"> |
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| <li class="blockList"> |
| <h4>cleanup</h4> |
| <pre>protected void cleanup(org.apache.hadoop.mapreduce.Mapper.Context context) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block">Called once at the end of the task.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code></dd> |
| </dl> |
| </li> |
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| <a name="run-org.apache.hadoop.mapreduce.Mapper.Context-"> |
| <!-- --> |
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| <h4>run</h4> |
| <pre>public void run(org.apache.hadoop.mapreduce.Mapper.Context context) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block">Expert users can override this method for more complete control over the |
| execution of the Mapper.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>context</code> - </dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code></dd> |
| </dl> |
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