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7IdentityMapper (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapred.lib</FONT>
92<BR>
93Class IdentityMapper&lt;K,V&gt;</H2>
94<PRE>
95<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
96  <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../org/apache/hadoop/mapred/MapReduceBase.html" title="class in org.apache.hadoop.mapred">org.apache.hadoop.mapred.MapReduceBase</A>
97      <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapred.lib.IdentityMapper&lt;K,V&gt;</B>
98</PRE>
99<DL>
100<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A>, <A HREF="../../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</A>, <A HREF="../../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper</A>&lt;K,V,K,V&gt;</DD>
101</DL>
102<HR>
103<B>Deprecated.</B>&nbsp;<I>Use <A HREF="../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A> instead.</I>
104<P>
105<DL>
106<DT><PRE><FONT SIZE="-1"><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</A>
107</FONT>public class <B>IdentityMapper&lt;K,V&gt;</B><DT>extends <A HREF="../../../../../org/apache/hadoop/mapred/MapReduceBase.html" title="class in org.apache.hadoop.mapred">MapReduceBase</A><DT>implements <A HREF="../../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper</A>&lt;K,V,K,V&gt;</DL>
108</PRE>
109
110<P>
111Implements the identity function, mapping inputs directly to outputs.
112<P>
113
114<P>
115<HR>
116
117<P>
118
119<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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121<A NAME="constructor_summary"><!-- --></A>
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124<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
125<B>Constructor Summary</B></FONT></TH>
126</TR>
127<TR BGCOLOR="white" CLASS="TableRowColor">
128<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html#IdentityMapper()">IdentityMapper</A></B>()</CODE>
129
130<BR>
131&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;&nbsp;</TD>
132</TR>
133</TABLE>
134&nbsp;
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136
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140<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
141<B>Method Summary</B></FONT></TH>
142</TR>
143<TR BGCOLOR="white" CLASS="TableRowColor">
144<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
145<CODE>&nbsp;void</CODE></FONT></TD>
146<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html#map(K, V, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">map</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">K</A>&nbsp;key,
147    <A HREF="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">V</A>&nbsp;val,
148    <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&lt;<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>&gt;&nbsp;output,
149    <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
150
151<BR>
152&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;The identify function.</TD>
153</TR>
154</TABLE>
155&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapred.MapReduceBase"><!-- --></A>
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158<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.mapred.<A HREF="../../../../../org/apache/hadoop/mapred/MapReduceBase.html" title="class in org.apache.hadoop.mapred">MapReduceBase</A></B></TH>
159</TR>
160<TR BGCOLOR="white" CLASS="TableRowColor">
161<TD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/MapReduceBase.html#close()">close</A>, <A HREF="../../../../../org/apache/hadoop/mapred/MapReduceBase.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></CODE></TD>
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188<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true#close()" title="class or interface in java.io">close</A></CODE></TD>
189</TR>
190</TABLE>
191&nbsp;
192<P>
193
194<!-- ========= CONSTRUCTOR DETAIL ======== -->
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203
204<A NAME="IdentityMapper()"><!-- --></A><H3>
205IdentityMapper</H3>
206<PRE>
207public <B>IdentityMapper</B>()</PRE>
208<DL>
209<DD><B>Deprecated.</B>&nbsp;</DL>
210
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217<B>Method Detail</B></FONT></TH>
218</TR>
219</TABLE>
220
221<A NAME="map(java.lang.Object,java.lang.Object,org.apache.hadoop.mapred.OutputCollector,org.apache.hadoop.mapred.Reporter)"><!-- --></A><A NAME="map(K, V, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
222map</H3>
223<PRE>
224public void <B>map</B>(<A HREF="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">K</A>&nbsp;key,
225                <A HREF="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="type parameter in IdentityMapper">V</A>&nbsp;val,
226                <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&lt;<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>&gt;&nbsp;output,
227                <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
228         throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
229<DL>
230<DD><B>Deprecated.</B>&nbsp;<DD>The identify function.  Input key/value pair is written directly to
231 output.
232<P>
233<DD><DL>
234<DT><B>Specified by:</B><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>&lt;<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>&gt;</CODE></DL>
235</DD>
236<DD><DL>
237<DT><B>Parameters:</B><DD><CODE>key</CODE> - the input key.<DD><CODE>val</CODE> - the input value.<DD><CODE>output</CODE> - collects mapped keys and values.<DD><CODE>reporter</CODE> - facility to report progress.
238<DT><B>Throws:</B>
239<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
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