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| 80 | |
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| 81 | <HR> |
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| 82 | <H2> |
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| 83 | Package org.apache.hadoop.mapred.lib |
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| 84 | </H2> |
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| 85 | Library of generally useful mappers, reducers, and partitioners. |
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| 86 | <P> |
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| 87 | <B>See:</B> |
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| 88 | <BR> |
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| 89 | <A HREF="#package_description"><B>Description</B></A> |
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| 90 | <P> |
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| 91 | |
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| 92 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 93 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 94 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 95 | <B>Interface Summary</B></FONT></TH> |
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| 96 | </TR> |
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| 97 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 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<K,V></A></B></TD> |
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| 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> |
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| 100 | </TR> |
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| 101 | </TABLE> |
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| 102 | |
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| 103 | |
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| 104 | <P> |
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| 105 | |
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| 106 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 107 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 108 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 109 | <B>Class Summary</B></FONT></TH> |
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| 110 | </TR> |
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| 111 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 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> |
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| 113 | <TD>The ChainMapper class allows to use multiple Mapper classes within a single |
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| 114 | Map task.</TD> |
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| 115 | </TR> |
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| 116 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 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> |
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| 118 | <TD>The ChainReducer class allows to chain multiple Mapper classes after a |
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| 119 | Reducer within the Reducer task.</TD> |
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| 120 | </TR> |
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| 121 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 122 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/CombineFileInputFormat.html" title="class in org.apache.hadoop.mapred.lib">CombineFileInputFormat<K,V></A></B></TD> |
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| 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 |
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| 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> |
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| 125 | </TR> |
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| 126 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 127 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/CombineFileRecordReader.html" title="class in org.apache.hadoop.mapred.lib">CombineFileRecordReader<K,V></A></B></TD> |
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| 128 | <TD>A generic RecordReader that can hand out different recordReaders |
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| 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> |
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| 130 | </TR> |
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| 131 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 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> |
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| 133 | <TD>A sub-collection of input files.</TD> |
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| 134 | </TR> |
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| 135 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 136 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="class in org.apache.hadoop.mapred.lib">DelegatingInputFormat<K,V></A></B></TD> |
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| 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 |
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| 138 | InputFormats.</TD> |
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| 139 | </TR> |
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| 140 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 141 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingMapper.html" title="class in org.apache.hadoop.mapred.lib">DelegatingMapper<K1,V1,K2,V2></A></B></TD> |
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| 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 |
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| 143 | mappers.</TD> |
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| 144 | </TR> |
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| 145 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 146 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/FieldSelectionMapReduce.html" title="class in org.apache.hadoop.mapred.lib">FieldSelectionMapReduce<K,V></A></B></TD> |
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| 147 | <TD>This class implements a mapper/reducer class that can be used to perform |
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| 148 | field selections in a manner similar to unix cut.</TD> |
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| 149 | </TR> |
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| 150 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 151 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/HashPartitioner.html" title="class in org.apache.hadoop.mapred.lib">HashPartitioner<K2,V2></A></B></TD> |
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| 152 | <TD><B>Deprecated.</B> <I>Use |
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| 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> |
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| 154 | </TR> |
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| 155 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 156 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/IdentityMapper.html" title="class in org.apache.hadoop.mapred.lib">IdentityMapper<K,V></A></B></TD> |
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| 157 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A> instead.</I></TD> |
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| 158 | </TR> |
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| 159 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 160 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/IdentityReducer.html" title="class in org.apache.hadoop.mapred.lib">IdentityReducer<K,V></A></B></TD> |
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| 161 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../../org/apache/hadoop/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce"><CODE>Reducer</CODE></A> instead.</I></TD> |
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| 162 | </TR> |
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| 163 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 164 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.html" title="class in org.apache.hadoop.mapred.lib">InputSampler<K,V></A></B></TD> |
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| 165 | <TD>Utility for collecting samples and writing a partition file for |
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| 166 | <A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="class in org.apache.hadoop.mapred.lib"><CODE>TotalOrderPartitioner</CODE></A>.</TD> |
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| 167 | </TR> |
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| 168 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 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<K,V></A></B></TD> |
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| 170 | <TD>Sample from s splits at regular intervals.</TD> |
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| 171 | </TR> |
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| 172 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 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<K,V></A></B></TD> |
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| 174 | <TD>Sample from random points in the input.</TD> |
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| 175 | </TR> |
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| 176 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 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<K,V></A></B></TD> |
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| 178 | <TD>Samples the first n records from s splits.</TD> |
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| 179 | </TR> |
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| 180 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 181 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InverseMapper.html" title="class in org.apache.hadoop.mapred.lib">InverseMapper<K,V></A></B></TD> |
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| 182 | <TD><B>Deprecated.</B> <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> |
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| 183 | instead.</I></TD> |
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| 184 | </TR> |
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| 185 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 186 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapred.lib">KeyFieldBasedComparator<K,V></A></B></TD> |
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| 187 | <TD>This comparator implementation provides a subset of the features provided |
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| 188 | by the Unix/GNU Sort.</TD> |
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| 189 | </TR> |
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| 190 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 191 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html" title="class in org.apache.hadoop.mapred.lib">KeyFieldBasedPartitioner<K2,V2></A></B></TD> |
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| 192 | <TD>Defines a way to partition keys based on certain key fields (also see |
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| 193 | <A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapred.lib"><CODE>KeyFieldBasedComparator</CODE></A>.</TD> |
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| 194 | </TR> |
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| 195 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 196 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/LongSumReducer.html" title="class in org.apache.hadoop.mapred.lib">LongSumReducer<K></A></B></TD> |
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| 197 | <TD><B>Deprecated.</B> <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> |
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| 198 | instead.</I></TD> |
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| 199 | </TR> |
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| 200 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 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> |
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| 202 | <TD>This class supports MapReduce jobs that have multiple input paths with |
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| 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> |
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| 204 | </TR> |
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| 205 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 206 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputFormat.html" title="class in org.apache.hadoop.mapred.lib">MultipleOutputFormat<K,V></A></B></TD> |
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| 207 | <TD>This abstract class extends the FileOutputFormat, allowing to write the |
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| 208 | output data to different output files.</TD> |
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| 209 | </TR> |
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| 210 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 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> |
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| 212 | <TD>The MultipleOutputs class simplifies writting to additional outputs other |
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| 213 | than the job default output via the <code>OutputCollector</code> passed to |
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| 214 | the <code>map()</code> and <code>reduce()</code> methods of the |
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| 215 | <code>Mapper</code> and <code>Reducer</code> implementations.</TD> |
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| 216 | </TR> |
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| 217 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 218 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleSequenceFileOutputFormat.html" title="class in org.apache.hadoop.mapred.lib">MultipleSequenceFileOutputFormat<K,V></A></B></TD> |
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| 219 | <TD>This class extends the MultipleOutputFormat, allowing to write the output data |
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| 220 | to different output files in sequence file output format.</TD> |
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| 221 | </TR> |
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| 222 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 223 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleTextOutputFormat.html" title="class in org.apache.hadoop.mapred.lib">MultipleTextOutputFormat<K,V></A></B></TD> |
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| 224 | <TD>This class extends the MultipleOutputFormat, allowing to write the output |
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| 225 | data to different output files in Text output format.</TD> |
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| 226 | </TR> |
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| 227 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 228 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultithreadedMapRunner.html" title="class in org.apache.hadoop.mapred.lib">MultithreadedMapRunner<K1,V1,K2,V2></A></B></TD> |
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| 229 | <TD>Multithreaded implementation for @link org.apache.hadoop.mapred.MapRunnable.</TD> |
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| 230 | </TR> |
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| 231 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 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> |
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| 233 | <TD>NLineInputFormat which splits N lines of input as one split.</TD> |
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| 234 | </TR> |
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| 235 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 236 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/NullOutputFormat.html" title="class in org.apache.hadoop.mapred.lib">NullOutputFormat<K,V></A></B></TD> |
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| 237 | <TD><B>Deprecated.</B> <I>Use |
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| 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> |
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| 239 | </TR> |
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| 240 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 241 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/RegexMapper.html" title="class in org.apache.hadoop.mapred.lib">RegexMapper<K></A></B></TD> |
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| 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> |
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| 243 | </TR> |
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| 244 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 245 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/TokenCountMapper.html" title="class in org.apache.hadoop.mapred.lib">TokenCountMapper<K></A></B></TD> |
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| 246 | <TD><B>Deprecated.</B> <I>Use |
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| 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> |
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| 248 | </TR> |
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| 249 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 250 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="class in org.apache.hadoop.mapred.lib">TotalOrderPartitioner<K extends WritableComparable,V></A></B></TD> |
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| 251 | <TD>Partitioner effecting a total order by reading split points from |
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| 252 | an externally generated source.</TD> |
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| 253 | </TR> |
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| 254 | </TABLE> |
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| 255 | |
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| 256 | |
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| 257 | <P> |
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| 258 | <A NAME="package_description"><!-- --></A><H2> |
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| 259 | Package org.apache.hadoop.mapred.lib Description |
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| 260 | </H2> |
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| 261 | |
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| 262 | <P> |
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| 263 | <p>Library of generally useful mappers, reducers, and partitioners.</p> |
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| 264 | <P> |
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| 265 | |
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| 266 | <P> |
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| 267 | <DL> |
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| 268 | </DL> |
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| 269 | <HR> |
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| 270 | |
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