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7org.apache.hadoop.mapred.lib (Hadoop 0.20.1 API)
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82<H2>
83Package org.apache.hadoop.mapred.lib
84</H2>
85Library of generally useful mappers, reducers, and partitioners.
86<P>
87<B>See:</B>
88<BR>
89&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<A HREF="#package_description"><B>Description</B></A>
90<P>
91
92<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
93<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
94<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
95<B>Interface Summary</B></FONT></TH>
96</TR>
97<TR BGCOLOR="white" CLASS="TableRowColor">
98<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.Sampler.html" title="interface in org.apache.hadoop.mapred.lib">InputSampler.Sampler&lt;K,V&gt;</A></B></TD>
99<TD>Interface to sample using an <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A>.</TD>
100</TR>
101</TABLE>
102&nbsp;
103
104<P>
105
106<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
107<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
108<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
109<B>Class Summary</B></FONT></TH>
110</TR>
111<TR BGCOLOR="white" CLASS="TableRowColor">
112<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/ChainMapper.html" title="class in org.apache.hadoop.mapred.lib">ChainMapper</A></B></TD>
113<TD>The ChainMapper class allows to use multiple Mapper classes within a single
114 Map task.</TD>
115</TR>
116<TR BGCOLOR="white" CLASS="TableRowColor">
117<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/ChainReducer.html" title="class in org.apache.hadoop.mapred.lib">ChainReducer</A></B></TD>
118<TD>The ChainReducer class allows to chain multiple Mapper classes after a
119 Reducer within the Reducer task.</TD>
120</TR>
121<TR BGCOLOR="white" CLASS="TableRowColor">
122<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/CombineFileInputFormat.html" title="class in org.apache.hadoop.mapred.lib">CombineFileInputFormat&lt;K,V&gt;</A></B></TD>
123<TD>An abstract <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A> that returns <A HREF="../../../../../org/apache/hadoop/mapred/lib/CombineFileSplit.html" title="class in org.apache.hadoop.mapred.lib"><CODE>CombineFileSplit</CODE></A>'s
124 in <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html#getSplits(org.apache.hadoop.mapred.JobConf, int)"><CODE>InputFormat.getSplits(JobConf, int)</CODE></A> method.</TD>
125</TR>
126<TR BGCOLOR="white" CLASS="TableRowColor">
127<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/CombineFileRecordReader.html" title="class in org.apache.hadoop.mapred.lib">CombineFileRecordReader&lt;K,V&gt;</A></B></TD>
128<TD>A generic RecordReader that can hand out different recordReaders
129 for each chunk in a <A HREF="../../../../../org/apache/hadoop/mapred/lib/CombineFileSplit.html" title="class in org.apache.hadoop.mapred.lib"><CODE>CombineFileSplit</CODE></A>.</TD>
130</TR>
131<TR BGCOLOR="white" CLASS="TableRowColor">
132<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/CombineFileSplit.html" title="class in org.apache.hadoop.mapred.lib">CombineFileSplit</A></B></TD>
133<TD>A sub-collection of input files.</TD>
134</TR>
135<TR BGCOLOR="white" CLASS="TableRowColor">
136<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="class in org.apache.hadoop.mapred.lib">DelegatingInputFormat&lt;K,V&gt;</A></B></TD>
137<TD>An <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A> that delegates behaviour of paths to multiple other
138 InputFormats.</TD>
139</TR>
140<TR BGCOLOR="white" CLASS="TableRowColor">
141<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="class in org.apache.hadoop.mapred.lib">DelegatingMapper&lt;K1,V1,K2,V2&gt;</A></B></TD>
142<TD>An <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
143 mappers.</TD>
144</TR>
145<TR BGCOLOR="white" CLASS="TableRowColor">
146<TD WIDTH="15%"><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></TD>
147<TD>This class implements a mapper/reducer class that can be used to perform
148 field selections in a manner similar to unix cut.</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/HashPartitioner.html" title="class in org.apache.hadoop.mapred.lib">HashPartitioner&lt;K2,V2&gt;</A></B></TD>
152<TD><B>Deprecated.</B>&nbsp;<I>Use
153   <A HREF="../../../../../org/apache/hadoop/mapreduce/lib/partition/HashPartitioner.html" title="class in org.apache.hadoop.mapreduce.lib.partition"><CODE>HashPartitioner</CODE></A> instead.</I></TD>
154</TR>
155<TR BGCOLOR="white" CLASS="TableRowColor">
156<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="class in org.apache.hadoop.mapred.lib">IdentityMapper&lt;K,V&gt;</A></B></TD>
157<TD><B>Deprecated.</B>&nbsp;<I>Use <A HREF="../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A> instead.</I></TD>
158</TR>
159<TR BGCOLOR="white" CLASS="TableRowColor">
160<TD WIDTH="15%"><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></TD>
161<TD><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>
162</TR>
163<TR BGCOLOR="white" CLASS="TableRowColor">
164<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.html" title="class in org.apache.hadoop.mapred.lib">InputSampler&lt;K,V&gt;</A></B></TD>
165<TD>Utility for collecting samples and writing a partition file for
166 <A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="class in org.apache.hadoop.mapred.lib"><CODE>TotalOrderPartitioner</CODE></A>.</TD>
167</TR>
168<TR BGCOLOR="white" CLASS="TableRowColor">
169<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.IntervalSampler.html" title="class in org.apache.hadoop.mapred.lib">InputSampler.IntervalSampler&lt;K,V&gt;</A></B></TD>
170<TD>Sample from s splits at regular intervals.</TD>
171</TR>
172<TR BGCOLOR="white" CLASS="TableRowColor">
173<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.RandomSampler.html" title="class in org.apache.hadoop.mapred.lib">InputSampler.RandomSampler&lt;K,V&gt;</A></B></TD>
174<TD>Sample from random points in the input.</TD>
175</TR>
176<TR BGCOLOR="white" CLASS="TableRowColor">
177<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.SplitSampler.html" title="class in org.apache.hadoop.mapred.lib">InputSampler.SplitSampler&lt;K,V&gt;</A></B></TD>
178<TD>Samples the first n records from s splits.</TD>
179</TR>
180<TR BGCOLOR="white" CLASS="TableRowColor">
181<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InverseMapper.html" title="class in org.apache.hadoop.mapred.lib">InverseMapper&lt;K,V&gt;</A></B></TD>
182<TD><B>Deprecated.</B>&nbsp;<I>Use <A HREF="../../../../../org/apache/hadoop/mapreduce/lib/map/InverseMapper.html" title="class in org.apache.hadoop.mapreduce.lib.map"><CODE>InverseMapper</CODE></A> 
183   instead.</I></TD>
184</TR>
185<TR BGCOLOR="white" CLASS="TableRowColor">
186<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapred.lib">KeyFieldBasedComparator&lt;K,V&gt;</A></B></TD>
187<TD>This comparator implementation provides a subset of the features provided
188 by the Unix/GNU Sort.</TD>
189</TR>
190<TR BGCOLOR="white" CLASS="TableRowColor">
191<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html" title="class in org.apache.hadoop.mapred.lib">KeyFieldBasedPartitioner&lt;K2,V2&gt;</A></B></TD>
192<TD>Defines a way to partition keys based on certain key fields (also see
193  <A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapred.lib"><CODE>KeyFieldBasedComparator</CODE></A>.</TD>
194</TR>
195<TR BGCOLOR="white" CLASS="TableRowColor">
196<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/LongSumReducer.html" title="class in org.apache.hadoop.mapred.lib">LongSumReducer&lt;K&gt;</A></B></TD>
197<TD><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>
198    instead.</I></TD>
199</TR>
200<TR BGCOLOR="white" CLASS="TableRowColor">
201<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleInputs.html" title="class in org.apache.hadoop.mapred.lib">MultipleInputs</A></B></TD>
202<TD>This class supports MapReduce jobs that have multiple input paths with
203 a different <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A> and <A HREF="../../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A> for each path</TD>
204</TR>
205<TR BGCOLOR="white" CLASS="TableRowColor">
206<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputFormat.html" title="class in org.apache.hadoop.mapred.lib">MultipleOutputFormat&lt;K,V&gt;</A></B></TD>
207<TD>This abstract class extends the FileOutputFormat, allowing to write the
208 output data to different output files.</TD>
209</TR>
210<TR BGCOLOR="white" CLASS="TableRowColor">
211<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html" title="class in org.apache.hadoop.mapred.lib">MultipleOutputs</A></B></TD>
212<TD>The MultipleOutputs class simplifies writting to additional outputs other
213 than the job default output via the <code>OutputCollector</code> passed to
214 the <code>map()</code> and <code>reduce()</code> methods of the
215 <code>Mapper</code> and <code>Reducer</code> implementations.</TD>
216</TR>
217<TR BGCOLOR="white" CLASS="TableRowColor">
218<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleSequenceFileOutputFormat.html" title="class in org.apache.hadoop.mapred.lib">MultipleSequenceFileOutputFormat&lt;K,V&gt;</A></B></TD>
219<TD>This class extends the MultipleOutputFormat, allowing to write the output data
220 to different output files in sequence file output format.</TD>
221</TR>
222<TR BGCOLOR="white" CLASS="TableRowColor">
223<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleTextOutputFormat.html" title="class in org.apache.hadoop.mapred.lib">MultipleTextOutputFormat&lt;K,V&gt;</A></B></TD>
224<TD>This class extends the MultipleOutputFormat, allowing to write the output
225 data to different output files in Text output format.</TD>
226</TR>
227<TR BGCOLOR="white" CLASS="TableRowColor">
228<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultithreadedMapRunner.html" title="class in org.apache.hadoop.mapred.lib">MultithreadedMapRunner&lt;K1,V1,K2,V2&gt;</A></B></TD>
229<TD>Multithreaded implementation for @link org.apache.hadoop.mapred.MapRunnable.</TD>
230</TR>
231<TR BGCOLOR="white" CLASS="TableRowColor">
232<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/NLineInputFormat.html" title="class in org.apache.hadoop.mapred.lib">NLineInputFormat</A></B></TD>
233<TD>NLineInputFormat which splits N lines of input as one split.</TD>
234</TR>
235<TR BGCOLOR="white" CLASS="TableRowColor">
236<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/NullOutputFormat.html" title="class in org.apache.hadoop.mapred.lib">NullOutputFormat&lt;K,V&gt;</A></B></TD>
237<TD><B>Deprecated.</B>&nbsp;<I>Use
238   <A HREF="../../../../../org/apache/hadoop/mapreduce/lib/output/NullOutputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.output"><CODE>NullOutputFormat</CODE></A> instead.</I></TD>
239</TR>
240<TR BGCOLOR="white" CLASS="TableRowColor">
241<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/RegexMapper.html" title="class in org.apache.hadoop.mapred.lib">RegexMapper&lt;K&gt;</A></B></TD>
242<TD>A <A HREF="../../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A> that extracts text matching a regular expression.</TD>
243</TR>
244<TR BGCOLOR="white" CLASS="TableRowColor">
245<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/TokenCountMapper.html" title="class in org.apache.hadoop.mapred.lib">TokenCountMapper&lt;K&gt;</A></B></TD>
246<TD><B>Deprecated.</B>&nbsp;<I>Use
247    <A HREF="../../../../../org/apache/hadoop/mapreduce/lib/map/TokenCounterMapper.html" title="class in org.apache.hadoop.mapreduce.lib.map"><CODE>TokenCounterMapper</CODE></A> instead.</I></TD>
248</TR>
249<TR BGCOLOR="white" CLASS="TableRowColor">
250<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="class in org.apache.hadoop.mapred.lib">TotalOrderPartitioner&lt;K extends WritableComparable,V&gt;</A></B></TD>
251<TD>Partitioner effecting a total order by reading split points from
252 an externally generated source.</TD>
253</TR>
254</TABLE>
255&nbsp;
256
257<P>
258<A NAME="package_description"><!-- --></A><H2>
259Package org.apache.hadoop.mapred.lib Description
260</H2>
261
262<P>
263<p>Library of generally useful mappers, reducers, and partitioners.</p>
264<P>
265
266<P>
267<DL>
268</DL>
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