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91org.apache.hadoop.mapred.lib</FONT>
92<BR>
93Class LongSumReducer&lt;K&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.LongSumReducer&lt;K&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/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A>&lt;K,<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>,K,<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>&gt;</DD>
101</DL>
102<HR>
103<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>
104    instead.</I>
105<P>
106<DL>
107<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>
108</FONT>public class <B>LongSumReducer&lt;K&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/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A>&lt;K,<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>,K,<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>&gt;</DL>
109</PRE>
110
111<P>
112A <A HREF="../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><CODE>Reducer</CODE></A> that sums long values.
113<P>
114
115<P>
116<HR>
117
118<P>
119
120<!-- ======== CONSTRUCTOR SUMMARY ======== -->
121
122<A NAME="constructor_summary"><!-- --></A>
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124<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
125<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
126<B>Constructor Summary</B></FONT></TH>
127</TR>
128<TR BGCOLOR="white" CLASS="TableRowColor">
129<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/LongSumReducer.html#LongSumReducer()">LongSumReducer</A></B>()</CODE>
130
131<BR>
132&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;&nbsp;</TD>
133</TR>
134</TABLE>
135&nbsp;
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143</TR>
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145<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
146<CODE>&nbsp;void</CODE></FONT></TD>
147<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/LongSumReducer.html#reduce(K, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">reduce</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/lib/LongSumReducer.html" title="type parameter in LongSumReducer">K</A>&nbsp;key,
148       <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>&lt;<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>&gt;&nbsp;values,
149       <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/LongSumReducer.html" title="type parameter in LongSumReducer">K</A>,<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>&gt;&nbsp;output,
150       <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
151
152<BR>
153&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<i>Reduces</i> values for a given key.</TD>
154</TR>
155</TABLE>
156&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapred.MapReduceBase"><!-- --></A>
157<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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159<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>
160</TR>
161<TR BGCOLOR="white" CLASS="TableRowColor">
162<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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190</TR>
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192&nbsp;
193<P>
194
195<!-- ========= CONSTRUCTOR DETAIL ======== -->
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197<A NAME="constructor_detail"><!-- --></A>
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200<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
201<B>Constructor Detail</B></FONT></TH>
202</TR>
203</TABLE>
204
205<A NAME="LongSumReducer()"><!-- --></A><H3>
206LongSumReducer</H3>
207<PRE>
208public <B>LongSumReducer</B>()</PRE>
209<DL>
210<DD><B>Deprecated.</B>&nbsp;</DL>
211
212<!-- ============ METHOD DETAIL ========== -->
213
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217<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
218<B>Method Detail</B></FONT></TH>
219</TR>
220</TABLE>
221
222<A NAME="reduce(java.lang.Object,java.util.Iterator,org.apache.hadoop.mapred.OutputCollector,org.apache.hadoop.mapred.Reporter)"><!-- --></A><A NAME="reduce(K, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
223reduce</H3>
224<PRE>
225public void <B>reduce</B>(<A HREF="../../../../../org/apache/hadoop/mapred/lib/LongSumReducer.html" title="type parameter in LongSumReducer">K</A>&nbsp;key,
226                   <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>&lt;<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>&gt;&nbsp;values,
227                   <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/LongSumReducer.html" title="type parameter in LongSumReducer">K</A>,<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>&gt;&nbsp;output,
228                   <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
229            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>
230<DL>
231<DD><B>Deprecated.</B>&nbsp;<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>
232<DD><i>Reduces</i> values for a given key. 
233 
234 <p>The framework calls this method for each
235 <code>&lt;key, (list of values)></code> pair in the grouped inputs.
236 Output values must be of the same type as input values.  Input keys must
237 not be altered. The framework will <b>reuse</b> the key and value objects
238 that are passed into the reduce, therefore the application should clone
239 the objects they want to keep a copy of. In many cases, all values are
240 combined into zero or one value.
241 </p>
242   
243 <p>Output pairs are collected with calls to 
244 <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html#collect(K, V)"><CODE>OutputCollector.collect(Object,Object)</CODE></A>.</p>
245
246 <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
247 or just indicate that they are alive. In scenarios where the application
248 takes an insignificant amount of time to process individual key/value
249 pairs, this is crucial since the framework might assume that the task has
250 timed-out and kill that task. The other way of avoiding this is to set
251 <a href="../../../../../../mapred-default.html#mapred.task.timeout">
252 mapred.task.timeout</a> to a high-enough value (or even zero for no
253 time-outs).</p>
254<P>
255<DD><DL>
256<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>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/lib/LongSumReducer.html" title="type parameter in LongSumReducer">K</A>,<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/LongSumReducer.html" title="type parameter in LongSumReducer">K</A>,<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>&gt;</CODE></DL>
257</DD>
258<DD><DL>
259<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.
260<DT><B>Throws:</B>
261<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>
262</DD>
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