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7Uses of Interface org.apache.hadoop.mapred.Reducer (Hadoop 0.20.1 API)
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83<H2>
84<B>Uses of Interface<br>org.apache.hadoop.mapred.Reducer</B></H2>
85</CENTER>
86
87<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
88<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
89<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
90Packages that use <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></FONT></TH>
91</TR>
92<TR BGCOLOR="white" CLASS="TableRowColor">
93<TD><A HREF="#org.apache.hadoop.contrib.index.mapred"><B>org.apache.hadoop.contrib.index.mapred</B></A></TD>
94<TD>&nbsp;&nbsp;</TD>
95</TR>
96<TR BGCOLOR="white" CLASS="TableRowColor">
97<TD><A HREF="#org.apache.hadoop.contrib.utils.join"><B>org.apache.hadoop.contrib.utils.join</B></A></TD>
98<TD>&nbsp;&nbsp;</TD>
99</TR>
100<TR BGCOLOR="white" CLASS="TableRowColor">
101<TD><A HREF="#org.apache.hadoop.examples"><B>org.apache.hadoop.examples</B></A></TD>
102<TD>Hadoop example code.&nbsp;</TD>
103</TR>
104<TR BGCOLOR="white" CLASS="TableRowColor">
105<TD><A HREF="#org.apache.hadoop.mapred"><B>org.apache.hadoop.mapred</B></A></TD>
106<TD>A software framework for easily writing applications which process vast
107amounts of data (multi-terabyte data-sets) parallelly on large clusters
108(thousands of nodes) built of commodity hardware in a reliable, fault-tolerant
109manner.&nbsp;</TD>
110</TR>
111<TR BGCOLOR="white" CLASS="TableRowColor">
112<TD><A HREF="#org.apache.hadoop.mapred.lib"><B>org.apache.hadoop.mapred.lib</B></A></TD>
113<TD>Library of generally useful mappers, reducers, and partitioners.&nbsp;</TD>
114</TR>
115<TR BGCOLOR="white" CLASS="TableRowColor">
116<TD><A HREF="#org.apache.hadoop.mapred.lib.aggregate"><B>org.apache.hadoop.mapred.lib.aggregate</B></A></TD>
117<TD>Classes for performing various counting and aggregations.&nbsp;</TD>
118</TR>
119<TR BGCOLOR="white" CLASS="TableRowColor">
120<TD><A HREF="#org.apache.hadoop.streaming"><B>org.apache.hadoop.streaming</B></A></TD>
121<TD><tt>Hadoop Streaming</tt> is a utility which allows users to create and run
122Map-Reduce jobs with any executables (e.g.&nbsp;</TD>
123</TR>
124</TABLE>
125&nbsp;
126<P>
127<A NAME="org.apache.hadoop.contrib.index.mapred"><!-- --></A>
128<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
129<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
130<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
131Uses of <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A> in <A HREF="../../../../../org/apache/hadoop/contrib/index/mapred/package-summary.html">org.apache.hadoop.contrib.index.mapred</A></FONT></TH>
132</TR>
133</TABLE>
134&nbsp;
135<P>
136
137<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
138<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
139<TH ALIGN="left" COLSPAN="2">Classes in <A HREF="../../../../../org/apache/hadoop/contrib/index/mapred/package-summary.html">org.apache.hadoop.contrib.index.mapred</A> that implement <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></FONT></TH>
140</TR>
141<TR BGCOLOR="white" CLASS="TableRowColor">
142<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
143<CODE>&nbsp;class</CODE></FONT></TD>
144<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/contrib/index/mapred/IndexUpdateCombiner.html" title="class in org.apache.hadoop.contrib.index.mapred">IndexUpdateCombiner</A></B></CODE>
145
146<BR>
147&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This combiner combines multiple intermediate forms into one intermediate
148 form.</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
152<CODE>&nbsp;class</CODE></FONT></TD>
153<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/contrib/index/mapred/IndexUpdateReducer.html" title="class in org.apache.hadoop.contrib.index.mapred">IndexUpdateReducer</A></B></CODE>
154
155<BR>
156&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This reducer applies to a shard the changes for it.</TD>
157</TR>
158</TABLE>
159&nbsp;
160<P>
161<A NAME="org.apache.hadoop.contrib.utils.join"><!-- --></A>
162<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
163<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
164<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
165Uses of <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A> in <A HREF="../../../../../org/apache/hadoop/contrib/utils/join/package-summary.html">org.apache.hadoop.contrib.utils.join</A></FONT></TH>
166</TR>
167</TABLE>
168&nbsp;
169<P>
170
171<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
172<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
173<TH ALIGN="left" COLSPAN="2">Classes in <A HREF="../../../../../org/apache/hadoop/contrib/utils/join/package-summary.html">org.apache.hadoop.contrib.utils.join</A> that implement <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></FONT></TH>
174</TR>
175<TR BGCOLOR="white" CLASS="TableRowColor">
176<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
177<CODE>&nbsp;class</CODE></FONT></TD>
178<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/contrib/utils/join/DataJoinMapperBase.html" title="class in org.apache.hadoop.contrib.utils.join">DataJoinMapperBase</A></B></CODE>
179
180<BR>
181&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This abstract class serves as the base class for the mapper class of a data
182 join job.</TD>
183</TR>
184<TR BGCOLOR="white" CLASS="TableRowColor">
185<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
186<CODE>&nbsp;class</CODE></FONT></TD>
187<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html" title="class in org.apache.hadoop.contrib.utils.join">DataJoinReducerBase</A></B></CODE>
188
189<BR>
190&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This abstract class serves as the base class for the reducer class of a data
191 join job.</TD>
192</TR>
193<TR BGCOLOR="white" CLASS="TableRowColor">
194<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
195<CODE>&nbsp;class</CODE></FONT></TD>
196<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html" title="class in org.apache.hadoop.contrib.utils.join">JobBase</A></B></CODE>
197
198<BR>
199&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A common base implementing some statics collecting mechanisms that are
200 commonly used in a typical map/reduce job.</TD>
201</TR>
202</TABLE>
203&nbsp;
204<P>
205<A NAME="org.apache.hadoop.examples"><!-- --></A>
206<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
207<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
208<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
209Uses of <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A> in <A HREF="../../../../../org/apache/hadoop/examples/package-summary.html">org.apache.hadoop.examples</A></FONT></TH>
210</TR>
211</TABLE>
212&nbsp;
213<P>
214
215<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
216<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
217<TH ALIGN="left" COLSPAN="2">Classes in <A HREF="../../../../../org/apache/hadoop/examples/package-summary.html">org.apache.hadoop.examples</A> that implement <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></FONT></TH>
218</TR>
219<TR BGCOLOR="white" CLASS="TableRowColor">
220<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
221<CODE>static&nbsp;class</CODE></FONT></TD>
222<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/examples/PiEstimator.PiReducer.html" title="class in org.apache.hadoop.examples">PiEstimator.PiReducer</A></B></CODE>
223
224<BR>
225&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reducer class for Pi estimation.</TD>
226</TR>
227<TR BGCOLOR="white" CLASS="TableRowColor">
228<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
229<CODE>&nbsp;class</CODE></FONT></TD>
230<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/examples/SleepJob.html" title="class in org.apache.hadoop.examples">SleepJob</A></B></CODE>
231
232<BR>
233&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dummy class for testing MR framefork.</TD>
234</TR>
235</TABLE>
236&nbsp;
237<P>
238<A NAME="org.apache.hadoop.mapred"><!-- --></A>
239<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
240<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
241<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
242Uses of <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A> in <A HREF="../../../../../org/apache/hadoop/mapred/package-summary.html">org.apache.hadoop.mapred</A></FONT></TH>
243</TR>
244</TABLE>
245&nbsp;
246<P>
247
248<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
249<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
250<TH ALIGN="left" COLSPAN="2">Methods in <A HREF="../../../../../org/apache/hadoop/mapred/package-summary.html">org.apache.hadoop.mapred</A> that return types with arguments of type <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></FONT></TH>
251</TR>
252<TR BGCOLOR="white" CLASS="TableRowColor">
253<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
254<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A>&gt;</CODE></FONT></TD>
255<TD><CODE><B>JobConf.</B><B><A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html#getCombinerClass()">getCombinerClass</A></B>()</CODE>
256
257<BR>
258&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;Get the user-defined <i>combiner</i> class used to combine map-outputs
259 before being sent to the reducers.</TD>
260</TR>
261<TR BGCOLOR="white" CLASS="TableRowColor">
262<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
263<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A>&gt;</CODE></FONT></TD>
264<TD><CODE><B>JobConf.</B><B><A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html#getReducerClass()">getReducerClass</A></B>()</CODE>
265
266<BR>
267&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;Get the <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><CODE>Reducer</CODE></A> class for the job.</TD>
268</TR>
269</TABLE>
270&nbsp;
271<P>
272
273<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
274<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
275<TH ALIGN="left" COLSPAN="2">Method parameters in <A HREF="../../../../../org/apache/hadoop/mapred/package-summary.html">org.apache.hadoop.mapred</A> with type arguments of type <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></FONT></TH>
276</TR>
277<TR BGCOLOR="white" CLASS="TableRowColor">
278<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
279<CODE>&nbsp;void</CODE></FONT></TD>
280<TD><CODE><B>JobConf.</B><B><A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html#setCombinerClass(java.lang.Class)">setCombinerClass</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A>&gt;&nbsp;theClass)</CODE>
281
282<BR>
283&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;Set the user-defined <i>combiner</i> class used to combine map-outputs
284 before being sent to the reducers.</TD>
285</TR>
286<TR BGCOLOR="white" CLASS="TableRowColor">
287<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
288<CODE>&nbsp;void</CODE></FONT></TD>
289<TD><CODE><B>JobConf.</B><B><A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html#setReducerClass(java.lang.Class)">setReducerClass</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A>&gt;&nbsp;theClass)</CODE>
290
291<BR>
292&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;Set the <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><CODE>Reducer</CODE></A> class for the job.</TD>
293</TR>
294</TABLE>
295&nbsp;
296<P>
297<A NAME="org.apache.hadoop.mapred.lib"><!-- --></A>
298<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
299<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
300<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
301Uses of <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A> in <A HREF="../../../../../org/apache/hadoop/mapred/lib/package-summary.html">org.apache.hadoop.mapred.lib</A></FONT></TH>
302</TR>
303</TABLE>
304&nbsp;
305<P>
306
307<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
308<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
309<TH ALIGN="left" COLSPAN="2">Classes in <A HREF="../../../../../org/apache/hadoop/mapred/lib/package-summary.html">org.apache.hadoop.mapred.lib</A> that implement <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></FONT></TH>
310</TR>
311<TR BGCOLOR="white" CLASS="TableRowColor">
312<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
313<CODE>&nbsp;class</CODE></FONT></TD>
314<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/ChainReducer.html" title="class in org.apache.hadoop.mapred.lib">ChainReducer</A></B></CODE>
315
316<BR>
317&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The ChainReducer class allows to chain multiple Mapper classes after a
318 Reducer within the Reducer task.</TD>
319</TR>
320<TR BGCOLOR="white" CLASS="TableRowColor">
321<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
322<CODE>&nbsp;class</CODE></FONT></TD>
323<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/FieldSelectionMapReduce.html" title="class in org.apache.hadoop.mapred.lib">FieldSelectionMapReduce&lt;K,V&gt;</A></B></CODE>
324
325<BR>
326&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This class implements a mapper/reducer class that can be used to perform
327 field selections in a manner similar to unix cut.</TD>
328</TR>
329<TR BGCOLOR="white" CLASS="TableRowColor">
330<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
331<CODE>&nbsp;class</CODE></FONT></TD>
332<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/IdentityReducer.html" title="class in org.apache.hadoop.mapred.lib">IdentityReducer&lt;K,V&gt;</A></B></CODE>
333
334<BR>
335&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I>Use <A HREF="../../../../../org/apache/hadoop/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce"><CODE>Reducer</CODE></A> instead.</I></TD>
336</TR>
337<TR BGCOLOR="white" CLASS="TableRowColor">
338<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
339<CODE>&nbsp;class</CODE></FONT></TD>
340<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/LongSumReducer.html" title="class in org.apache.hadoop.mapred.lib">LongSumReducer&lt;K&gt;</A></B></CODE>
341
342<BR>
343&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I>Use <A HREF="../../../../../org/apache/hadoop/mapreduce/lib/reduce/LongSumReducer.html" title="class in org.apache.hadoop.mapreduce.lib.reduce"><CODE>LongSumReducer</CODE></A>
344    instead.</I></TD>
345</TR>
346</TABLE>
347&nbsp;
348<P>
349
350<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
351<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
352<TH ALIGN="left" COLSPAN="2">Method parameters in <A HREF="../../../../../org/apache/hadoop/mapred/lib/package-summary.html">org.apache.hadoop.mapred.lib</A> with type arguments of type <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></FONT></TH>
353</TR>
354<TR BGCOLOR="white" CLASS="TableRowColor">
355<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
356<CODE>static
357<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
358<TR ALIGN="right" VALIGN="">
359<TD NOWRAP><FONT SIZE="-1">
360<CODE>&lt;K1,V1,K2,V2&gt; 
361<BR>
362void</CODE></FONT></TD>
363</TR>
364</TABLE>
365</CODE></FONT></TD>
366<TD><CODE><B>ChainReducer.</B><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/ChainReducer.html#setReducer(org.apache.hadoop.mapred.JobConf, java.lang.Class, java.lang.Class, java.lang.Class, java.lang.Class, java.lang.Class, boolean, org.apache.hadoop.mapred.JobConf)">setReducer</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
367           <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A>&lt;K1,V1,K2,V2&gt;&gt;&nbsp;klass,
368           <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends K1&gt;&nbsp;inputKeyClass,
369           <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends V1&gt;&nbsp;inputValueClass,
370           <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends K2&gt;&nbsp;outputKeyClass,
371           <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends V2&gt;&nbsp;outputValueClass,
372           boolean&nbsp;byValue,
373           <A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;reducerConf)</CODE>
374
375<BR>
376&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the Reducer class to the chain job's JobConf.</TD>
377</TR>
378</TABLE>
379&nbsp;
380<P>
381<A NAME="org.apache.hadoop.mapred.lib.aggregate"><!-- --></A>
382<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
383<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
384<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
385Uses of <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A> in <A HREF="../../../../../org/apache/hadoop/mapred/lib/aggregate/package-summary.html">org.apache.hadoop.mapred.lib.aggregate</A></FONT></TH>
386</TR>
387</TABLE>
388&nbsp;
389<P>
390
391<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
392<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
393<TH ALIGN="left" COLSPAN="2">Classes in <A HREF="../../../../../org/apache/hadoop/mapred/lib/aggregate/package-summary.html">org.apache.hadoop.mapred.lib.aggregate</A> that implement <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></FONT></TH>
394</TR>
395<TR BGCOLOR="white" CLASS="TableRowColor">
396<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
397<CODE>&nbsp;class</CODE></FONT></TD>
398<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorCombiner.html" title="class in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorCombiner&lt;K1 extends WritableComparable,V1 extends Writable&gt;</A></B></CODE>
399
400<BR>
401&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This class implements the generic combiner of Aggregate.</TD>
402</TR>
403<TR BGCOLOR="white" CLASS="TableRowColor">
404<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
405<CODE>&nbsp;class</CODE></FONT></TD>
406<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJobBase.html" title="class in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorJobBase&lt;K1 extends WritableComparable,V1 extends Writable&gt;</A></B></CODE>
407
408<BR>
409&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This abstract class implements some common functionalities of the
410 the generic mapper, reducer and combiner classes of Aggregate.</TD>
411</TR>
412<TR BGCOLOR="white" CLASS="TableRowColor">
413<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
414<CODE>&nbsp;class</CODE></FONT></TD>
415<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorMapper.html" title="class in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorMapper&lt;K1 extends WritableComparable,V1 extends Writable&gt;</A></B></CODE>
416
417<BR>
418&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This class implements the generic mapper of Aggregate.</TD>
419</TR>
420<TR BGCOLOR="white" CLASS="TableRowColor">
421<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
422<CODE>&nbsp;class</CODE></FONT></TD>
423<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorReducer.html" title="class in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorReducer&lt;K1 extends WritableComparable,V1 extends Writable&gt;</A></B></CODE>
424
425<BR>
426&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This class implements the generic reducer of Aggregate.</TD>
427</TR>
428</TABLE>
429&nbsp;
430<P>
431<A NAME="org.apache.hadoop.streaming"><!-- --></A>
432<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
433<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
434<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
435Uses of <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A> in <A HREF="../../../../../org/apache/hadoop/streaming/package-summary.html">org.apache.hadoop.streaming</A></FONT></TH>
436</TR>
437</TABLE>
438&nbsp;
439<P>
440
441<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
442<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
443<TH ALIGN="left" COLSPAN="2">Classes in <A HREF="../../../../../org/apache/hadoop/streaming/package-summary.html">org.apache.hadoop.streaming</A> that implement <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></FONT></TH>
444</TR>
445<TR BGCOLOR="white" CLASS="TableRowColor">
446<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
447<CODE>&nbsp;class</CODE></FONT></TD>
448<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/streaming/PipeReducer.html" title="class in org.apache.hadoop.streaming">PipeReducer</A></B></CODE>
449
450<BR>
451&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A generic Reducer bridge.</TD>
452</TR>
453</TABLE>
454&nbsp;
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