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91org.apache.hadoop.mapred.lib</FONT>
92<BR>
93Class DelegatingMapper&lt;K1,V1,K2,V2&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 "><B>org.apache.hadoop.mapred.lib.DelegatingMapper&lt;K1,V1,K2,V2&gt;</B>
97</PRE>
98<DL>
99<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;K1,V1,K2,V2&gt;</DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>DelegatingMapper&lt;K1,V1,K2,V2&gt;</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper</A>&lt;K1,V1,K2,V2&gt;</DL>
104</PRE>
105
106<P>
107An <A HREF="../../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A> that delegates behaviour of paths to multiple other
108 mappers.
109<P>
110
111<P>
112<DL>
113<DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleInputs.html#addInputPath(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class)"><CODE>MultipleInputs.addInputPath(JobConf, Path, Class, Class)</CODE></A></DL>
114<HR>
115
116<P>
117
118<!-- ======== CONSTRUCTOR SUMMARY ======== -->
119
120<A NAME="constructor_summary"><!-- --></A>
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122<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
123<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
124<B>Constructor Summary</B></FONT></TH>
125</TR>
126<TR BGCOLOR="white" CLASS="TableRowColor">
127<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html#DelegatingMapper()">DelegatingMapper</A></B>()</CODE>
128
129<BR>
130&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
131</TR>
132</TABLE>
133&nbsp;
134<!-- ========== METHOD SUMMARY =========== -->
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140<B>Method Summary</B></FONT></TH>
141</TR>
142<TR BGCOLOR="white" CLASS="TableRowColor">
143<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
144<CODE>&nbsp;void</CODE></FONT></TD>
145<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html#close()">close</A></B>()</CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
152<CODE>&nbsp;void</CODE></FONT></TD>
153<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf)</CODE>
154
155<BR>
156&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initializes a new instance from a <A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><CODE>JobConf</CODE></A>.</TD>
157</TR>
158<TR BGCOLOR="white" CLASS="TableRowColor">
159<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
160<CODE>&nbsp;void</CODE></FONT></TD>
161<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html#map(K1, V1, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">map</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="type parameter in DelegatingMapper">K1</A>&nbsp;key,
162    <A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="type parameter in DelegatingMapper">V1</A>&nbsp;value,
163    <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/DelegatingMapper.html" title="type parameter in DelegatingMapper">K2</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="type parameter in DelegatingMapper">V2</A>&gt;&nbsp;outputCollector,
164    <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
165
166<BR>
167&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Maps a single input key/value pair into an intermediate key/value pair.</TD>
168</TR>
169</TABLE>
170&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
171<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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177</TR>
178</TABLE>
179&nbsp;
180<P>
181
182<!-- ========= CONSTRUCTOR DETAIL ======== -->
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187<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
188<B>Constructor Detail</B></FONT></TH>
189</TR>
190</TABLE>
191
192<A NAME="DelegatingMapper()"><!-- --></A><H3>
193DelegatingMapper</H3>
194<PRE>
195public <B>DelegatingMapper</B>()</PRE>
196<DL>
197</DL>
198
199<!-- ============ METHOD DETAIL ========== -->
200
201<A NAME="method_detail"><!-- --></A>
202<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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204<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
205<B>Method Detail</B></FONT></TH>
206</TR>
207</TABLE>
208
209<A NAME="map(java.lang.Object,java.lang.Object,org.apache.hadoop.mapred.OutputCollector,org.apache.hadoop.mapred.Reporter)"><!-- --></A><A NAME="map(K1, V1, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
210map</H3>
211<PRE>
212public void <B>map</B>(<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="type parameter in DelegatingMapper">K1</A>&nbsp;key,
213                <A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="type parameter in DelegatingMapper">V1</A>&nbsp;value,
214                <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/DelegatingMapper.html" title="type parameter in DelegatingMapper">K2</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="type parameter in DelegatingMapper">V2</A>&gt;&nbsp;outputCollector,
215                <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
216         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>
217<DL>
218<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/mapred/Mapper.html#map(K1, V1, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">Mapper</A></CODE></B></DD>
219<DD>Maps a single input key/value pair into an intermediate key/value pair.
220 
221 <p>Output pairs need not be of the same types as input pairs.  A given
222 input pair may map to zero or many output pairs.  Output pairs are
223 collected with calls to
224 <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html#collect(K, V)"><CODE>OutputCollector.collect(Object,Object)</CODE></A>.</p>
225
226 <p>Applications can use the <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred"><CODE>Reporter</CODE></A> provided to report progress
227 or just indicate that they are alive. In scenarios where the application
228 takes an insignificant amount of time to process individual key/value
229 pairs, this is crucial since the framework might assume that the task has
230 timed-out and kill that task. The other way of avoiding this is to set
231 <a href="../../../../../../mapred-default.html#mapred.task.timeout">
232 mapred.task.timeout</a> to a high-enough value (or even zero for no
233 time-outs).</p>
234<P>
235<DD><DL>
236<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/DelegatingMapper.html" title="type parameter in DelegatingMapper">K1</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="type parameter in DelegatingMapper">V1</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="type parameter in DelegatingMapper">K2</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="type parameter in DelegatingMapper">V2</A>&gt;</CODE></DL>
237</DD>
238<DD><DL>
239<DT><B>Parameters:</B><DD><CODE>key</CODE> - the input key.<DD><CODE>value</CODE> - the input value.<DD><CODE>outputCollector</CODE> - collects mapped keys and values.<DD><CODE>reporter</CODE> - facility to report progress.
240<DT><B>Throws:</B>
241<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>
242</DD>
243</DL>
244<HR>
245
246<A NAME="configure(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
247configure</H3>
248<PRE>
249public void <B>configure</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf)</PRE>
250<DL>
251<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/mapred/JobConfigurable.html#configure(org.apache.hadoop.mapred.JobConf)">JobConfigurable</A></CODE></B></DD>
252<DD>Initializes a new instance from a <A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><CODE>JobConf</CODE></A>.
253<P>
254<DD><DL>
255<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/JobConfigurable.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</A></CODE></DL>
256</DD>
257<DD><DL>
258<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration</DL>
259</DD>
260</DL>
261<HR>
262
263<A NAME="close()"><!-- --></A><H3>
264close</H3>
265<PRE>
266public void <B>close</B>()
267           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>
268<DL>
269<DD><DL>
270<DT><B>Specified by:</B><DD><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> in interface <CODE><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></CODE></DL>
271</DD>
272<DD><DL>
273
274<DT><B>Throws:</B>
275<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>
276</DD>
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