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7PipeReducer (Hadoop 0.20.1 API)
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79  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;<A HREF="#fields_inherited_from_class_org.apache.hadoop.streaming.PipeMapRed">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
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91org.apache.hadoop.streaming</FONT>
92<BR>
93Class PipeReducer</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/streaming/PipeMapRed.html" title="class in org.apache.hadoop.streaming">org.apache.hadoop.streaming.PipeMapRed</A>
97      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.streaming.PipeReducer</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/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></DD>
101</DL>
102<HR>
103<DL>
104<DT><PRE>public class <B>PipeReducer</B><DT>extends <A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html" title="class in org.apache.hadoop.streaming">PipeMapRed</A><DT>implements <A HREF="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></DL>
105</PRE>
106
107<P>
108A generic Reducer bridge.
109  It delegates operations to an external program via stdin and stdout.
110<P>
111
112<P>
113<HR>
114
115<P>
116<!-- =========== FIELD SUMMARY =========== -->
117
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121<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
122<B>Field Summary</B></FONT></TH>
123</TR>
124</TABLE>
125&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.streaming.PipeMapRed"><!-- --></A>
126<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
127<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
128<TH ALIGN="left"><B>Fields inherited from class org.apache.hadoop.streaming.<A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html" title="class in org.apache.hadoop.streaming">PipeMapRed</A></B></TH>
129</TR>
130<TR BGCOLOR="white" CLASS="TableRowColor">
131<TD><CODE><A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html#LOG">LOG</A>, <A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html#outerrThreadsThrowable">outerrThreadsThrowable</A></CODE></TD>
132</TR>
133</TABLE>
134&nbsp;
135<!-- ======== CONSTRUCTOR SUMMARY ======== -->
136
137<A NAME="constructor_summary"><!-- --></A>
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140<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
141<B>Constructor Summary</B></FONT></TH>
142</TR>
143<TR BGCOLOR="white" CLASS="TableRowColor">
144<TD><CODE><B><A HREF="../../../../org/apache/hadoop/streaming/PipeReducer.html#PipeReducer()">PipeReducer</A></B>()</CODE>
145
146<BR>
147&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
148</TR>
149</TABLE>
150&nbsp;
151<!-- ========== METHOD SUMMARY =========== -->
152
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156<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
157<B>Method Summary</B></FONT></TH>
158</TR>
159<TR BGCOLOR="white" CLASS="TableRowColor">
160<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
161<CODE>&nbsp;void</CODE></FONT></TD>
162<TD><CODE><B><A HREF="../../../../org/apache/hadoop/streaming/PipeReducer.html#close()">close</A></B>()</CODE>
163
164<BR>
165&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
166</TR>
167<TR BGCOLOR="white" CLASS="TableRowColor">
168<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
169<CODE>&nbsp;void</CODE></FONT></TD>
170<TD><CODE><B><A HREF="../../../../org/apache/hadoop/streaming/PipeReducer.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;job)</CODE>
171
172<BR>
173&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>
174</TR>
175<TR BGCOLOR="white" CLASS="TableRowColor">
176<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
177<CODE>&nbsp;void</CODE></FONT></TD>
178<TD><CODE><B><A HREF="../../../../org/apache/hadoop/streaming/PipeReducer.html#reduce(java.lang.Object, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">reduce</A></B>(<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>&nbsp;key,
179       <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A>&nbsp;values,
180       <A HREF="../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&nbsp;output,
181       <A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<i>Reduces</i> values for a given key.</TD>
185</TR>
186</TABLE>
187&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.streaming.PipeMapRed"><!-- --></A>
188<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
189<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
190<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.streaming.<A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html" title="class in org.apache.hadoop.streaming">PipeMapRed</A></B></TH>
191</TR>
192<TR BGCOLOR="white" CLASS="TableRowColor">
193<TD><CODE><A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html#getContext()">getContext</A>, <A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html#mapRedFinished()">mapRedFinished</A></CODE></TD>
194</TR>
195</TABLE>
196&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
197<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
198<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
199<TH ALIGN="left"><B>Methods inherited from class java.lang.<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></B></TH>
200</TR>
201<TR BGCOLOR="white" CLASS="TableRowColor">
202<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
203</TR>
204</TABLE>
205&nbsp;
206<P>
207
208<!-- ========= CONSTRUCTOR DETAIL ======== -->
209
210<A NAME="constructor_detail"><!-- --></A>
211<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
212<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
213<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
214<B>Constructor Detail</B></FONT></TH>
215</TR>
216</TABLE>
217
218<A NAME="PipeReducer()"><!-- --></A><H3>
219PipeReducer</H3>
220<PRE>
221public <B>PipeReducer</B>()</PRE>
222<DL>
223</DL>
224
225<!-- ============ METHOD DETAIL ========== -->
226
227<A NAME="method_detail"><!-- --></A>
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230<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
231<B>Method Detail</B></FONT></TH>
232</TR>
233</TABLE>
234
235<A NAME="configure(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
236configure</H3>
237<PRE>
238public void <B>configure</B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
239<DL>
240<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>
241<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>.
242<P>
243<DD><DL>
244<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><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></CODE> in class <CODE><A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html" title="class in org.apache.hadoop.streaming">PipeMapRed</A></CODE></DL>
245</DD>
246<DD><DL>
247<DT><B>Parameters:</B><DD><CODE>job</CODE> - the configuration</DL>
248</DD>
249</DL>
250<HR>
251
252<A NAME="reduce(java.lang.Object, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
253reduce</H3>
254<PRE>
255public void <B>reduce</B>(<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>&nbsp;key,
256                   <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A>&nbsp;values,
257                   <A HREF="../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&nbsp;output,
258                   <A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
259            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>
260<DL>
261<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/mapred/Reducer.html#reduce(K2, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">Reducer</A></CODE></B></DD>
262<DD><i>Reduces</i> values for a given key. 
263 
264 <p>The framework calls this method for each
265 <code>&lt;key, (list of values)></code> pair in the grouped inputs.
266 Output values must be of the same type as input values.  Input keys must
267 not be altered. The framework will <b>reuse</b> the key and value objects
268 that are passed into the reduce, therefore the application should clone
269 the objects they want to keep a copy of. In many cases, all values are
270 combined into zero or one value.
271 </p>
272   
273 <p>Output pairs are collected with calls to 
274 <A HREF="../../../../org/apache/hadoop/mapred/OutputCollector.html#collect(K, V)"><CODE>OutputCollector.collect(Object,Object)</CODE></A>.</p>
275
276 <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
277 or just indicate that they are alive. In scenarios where the application
278 takes an insignificant amount of time to process individual key/value
279 pairs, this is crucial since the framework might assume that the task has
280 timed-out and kill that task. The other way of avoiding this is to set
281 <a href="../../../../../mapred-default.html#mapred.task.timeout">
282 mapred.task.timeout</a> to a high-enough value (or even zero for no
283 time-outs).</p>
284<P>
285<DD><DL>
286<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/mapred/Reducer.html#reduce(K2, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">reduce</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></CODE></DL>
287</DD>
288<DD><DL>
289<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key.<DD><CODE>values</CODE> - the list of values to reduce.<DD><CODE>output</CODE> - to collect keys and combined values.<DD><CODE>reporter</CODE> - facility to report progress.
290<DT><B>Throws:</B>
291<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>
292</DD>
293</DL>
294<HR>
295
296<A NAME="close()"><!-- --></A><H3>
297close</H3>
298<PRE>
299public void <B>close</B>()</PRE>
300<DL>
301<DD><DL>
302<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>
303</DD>
304<DD><DL>
305</DL>
306</DD>
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