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7IndexUpdateCombiner (Hadoop 0.20.1 API)
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91org.apache.hadoop.contrib.index.mapred</FONT>
92<BR>
93Class IndexUpdateCombiner</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.contrib.index.mapred.IndexUpdateCombiner</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;<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/Shard.html" title="class in org.apache.hadoop.contrib.index.mapred">Shard</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/IntermediateForm.html" title="class in org.apache.hadoop.contrib.index.mapred">IntermediateForm</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/Shard.html" title="class in org.apache.hadoop.contrib.index.mapred">Shard</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/IntermediateForm.html" title="class in org.apache.hadoop.contrib.index.mapred">IntermediateForm</A>&gt;</DD>
101</DL>
102<HR>
103<DL>
104<DT><PRE>public class <B>IndexUpdateCombiner</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;<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/Shard.html" title="class in org.apache.hadoop.contrib.index.mapred">Shard</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/IntermediateForm.html" title="class in org.apache.hadoop.contrib.index.mapred">IntermediateForm</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/Shard.html" title="class in org.apache.hadoop.contrib.index.mapred">Shard</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/IntermediateForm.html" title="class in org.apache.hadoop.contrib.index.mapred">IntermediateForm</A>&gt;</DL>
105</PRE>
106
107<P>
108This combiner combines multiple intermediate forms into one intermediate
109 form. More specifically, the input intermediate forms are a single-document
110 ram index and/or a single delete term. An output intermediate form contains
111 a multi-document ram index and/or multiple delete terms.
112<P>
113
114<P>
115<HR>
116
117<P>
118
119<!-- ======== CONSTRUCTOR SUMMARY ======== -->
120
121<A NAME="constructor_summary"><!-- --></A>
122<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
123<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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/contrib/index/mapred/IndexUpdateCombiner.html#IndexUpdateCombiner()">IndexUpdateCombiner</A></B>()</CODE>
129
130<BR>
131&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
132</TR>
133</TABLE>
134&nbsp;
135<!-- ========== METHOD SUMMARY =========== -->
136
137<A NAME="method_summary"><!-- --></A>
138<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
139<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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/contrib/index/mapred/IndexUpdateCombiner.html#close()">close</A></B>()</CODE>
147
148<BR>
149&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Default implementation that does nothing.</TD>
150</TR>
151<TR BGCOLOR="white" CLASS="TableRowColor">
152<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
153<CODE>&nbsp;void</CODE></FONT></TD>
154<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/IndexUpdateCombiner.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>
155
156<BR>
157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Default implementation that does nothing.</TD>
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/contrib/index/mapred/IndexUpdateCombiner.html#reduce(org.apache.hadoop.contrib.index.mapred.Shard, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">reduce</A></B>(<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/Shard.html" title="class in org.apache.hadoop.contrib.index.mapred">Shard</A>&nbsp;key,
163       <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/contrib/index/mapred/IntermediateForm.html" title="class in org.apache.hadoop.contrib.index.mapred">IntermediateForm</A>&gt;&nbsp;values,
164       <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&lt;<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/Shard.html" title="class in org.apache.hadoop.contrib.index.mapred">Shard</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/IntermediateForm.html" title="class in org.apache.hadoop.contrib.index.mapred">IntermediateForm</A>&gt;&nbsp;output,
165       <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
166
167<BR>
168&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<i>Reduces</i> values for a given key.</TD>
169</TR>
170</TABLE>
171&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
172<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
173<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
174<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>
175</TR>
176<TR BGCOLOR="white" CLASS="TableRowColor">
177<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>
178</TR>
179</TABLE>
180&nbsp;
181<P>
182
183<!-- ========= CONSTRUCTOR DETAIL ======== -->
184
185<A NAME="constructor_detail"><!-- --></A>
186<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
187<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
188<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
189<B>Constructor Detail</B></FONT></TH>
190</TR>
191</TABLE>
192
193<A NAME="IndexUpdateCombiner()"><!-- --></A><H3>
194IndexUpdateCombiner</H3>
195<PRE>
196public <B>IndexUpdateCombiner</B>()</PRE>
197<DL>
198</DL>
199
200<!-- ============ METHOD DETAIL ========== -->
201
202<A NAME="method_detail"><!-- --></A>
203<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
204<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
205<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
206<B>Method Detail</B></FONT></TH>
207</TR>
208</TABLE>
209
210<A NAME="reduce(org.apache.hadoop.contrib.index.mapred.Shard, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
211reduce</H3>
212<PRE>
213public void <B>reduce</B>(<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/Shard.html" title="class in org.apache.hadoop.contrib.index.mapred">Shard</A>&nbsp;key,
214                   <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/contrib/index/mapred/IntermediateForm.html" title="class in org.apache.hadoop.contrib.index.mapred">IntermediateForm</A>&gt;&nbsp;values,
215                   <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&lt;<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/Shard.html" title="class in org.apache.hadoop.contrib.index.mapred">Shard</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/IntermediateForm.html" title="class in org.apache.hadoop.contrib.index.mapred">IntermediateForm</A>&gt;&nbsp;output,
216                   <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
217            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>
218<DL>
219<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>
220<DD><i>Reduces</i> values for a given key. 
221 
222 <p>The framework calls this method for each
223 <code>&lt;key, (list of values)></code> pair in the grouped inputs.
224 Output values must be of the same type as input values.  Input keys must
225 not be altered. The framework will <b>reuse</b> the key and value objects
226 that are passed into the reduce, therefore the application should clone
227 the objects they want to keep a copy of. In many cases, all values are
228 combined into zero or one value.
229 </p>
230   
231 <p>Output pairs are collected with calls to 
232 <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html#collect(K, V)"><CODE>OutputCollector.collect(Object,Object)</CODE></A>.</p>
233
234 <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
235 or just indicate that they are alive. In scenarios where the application
236 takes an insignificant amount of time to process individual key/value
237 pairs, this is crucial since the framework might assume that the task has
238 timed-out and kill that task. The other way of avoiding this is to set
239 <a href="../../../../../../../mapred-default.html#mapred.task.timeout">
240 mapred.task.timeout</a> to a high-enough value (or even zero for no
241 time-outs).</p>
242<P>
243<DD><DL>
244<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/contrib/index/mapred/Shard.html" title="class in org.apache.hadoop.contrib.index.mapred">Shard</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/IntermediateForm.html" title="class in org.apache.hadoop.contrib.index.mapred">IntermediateForm</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/Shard.html" title="class in org.apache.hadoop.contrib.index.mapred">Shard</A>,<A HREF="../../../../../../org/apache/hadoop/contrib/index/mapred/IntermediateForm.html" title="class in org.apache.hadoop.contrib.index.mapred">IntermediateForm</A>&gt;</CODE></DL>
245</DD>
246<DD><DL>
247<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.
248<DT><B>Throws:</B>
249<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>
250</DD>
251</DL>
252<HR>
253
254<A NAME="configure(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
255configure</H3>
256<PRE>
257public void <B>configure</B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
258<DL>
259<DD><B>Description copied from class: <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/MapReduceBase.html#configure(org.apache.hadoop.mapred.JobConf)">MapReduceBase</A></CODE></B></DD>
260<DD>Default implementation that does nothing.
261<P>
262<DD><DL>
263<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/mapred/MapReduceBase.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></CODE> in class <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/MapReduceBase.html" title="class in org.apache.hadoop.mapred">MapReduceBase</A></CODE></DL>
264</DD>
265<DD><DL>
266<DT><B>Parameters:</B><DD><CODE>job</CODE> - the configuration</DL>
267</DD>
268</DL>
269<HR>
270
271<A NAME="close()"><!-- --></A><H3>
272close</H3>
273<PRE>
274public void <B>close</B>()
275           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>
276<DL>
277<DD><B>Description copied from class: <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/MapReduceBase.html#close()">MapReduceBase</A></CODE></B></DD>
278<DD>Default implementation that does nothing.
279<P>
280<DD><DL>
281<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><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/MapReduceBase.html#close()">close</A></CODE> in class <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/MapReduceBase.html" title="class in org.apache.hadoop.mapred">MapReduceBase</A></CODE></DL>
282</DD>
283<DD><DL>
284
285<DT><B>Throws:</B>
286<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>
287</DD>
288</DL>
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