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| <h2 title="Class IdentityMapper" class="title">Class IdentityMapper<K,V></h2> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">IdentityMapper<K,V></span> |
| extends <a href="../../../../../org/apache/hadoop/mapred/MapReduceBase.html" title="class in org.apache.hadoop.mapred">MapReduceBase</a> |
| implements <a href="../../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper</a><K,V,K,V></pre> |
| <div class="block">Implements the identity function, mapping inputs directly to outputs.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html#map-K-V-org.apache.hadoop.mapred.OutputCollector-org.apache.hadoop.mapred.Reporter-">map</a></span>(<a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">K</a> key, |
| <a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">V</a> val, |
| <a href="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</a><<a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">K</a>,<a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">V</a>> output, |
| <a href="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</a> reporter)</code> |
| <div class="block">The identity function.</div> |
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| <h4>IdentityMapper</h4> |
| <pre>public IdentityMapper()</pre> |
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| <h4>map</h4> |
| <pre>public void map(<a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">K</a> key, |
| <a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">V</a> val, |
| <a href="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</a><<a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">K</a>,<a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">V</a>> output, |
| <a href="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</a> reporter) |
| 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></pre> |
| <div class="block">The identity function. Input key/value pair is written directly to |
| output.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/mapred/Mapper.html#map-K1-V1-org.apache.hadoop.mapred.OutputCollector-org.apache.hadoop.mapred.Reporter-">map</a></code> in interface <code><a href="../../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper</a><<a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">K</a>,<a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">V</a>,<a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">K</a>,<a href="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">V</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - the input key.</dd> |
| <dd><code>val</code> - the input value.</dd> |
| <dd><code>output</code> - collects mapped keys and values.</dd> |
| <dd><code>reporter</code> - facility to report progress.</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> |
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