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| 7 | Uses of Package org.apache.hadoop.mapreduce (Hadoop 0.20.1 API) |
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| 83 | <H2> |
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| 84 | <B>Uses of Package<br>org.apache.hadoop.mapreduce</B></H2> |
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| 85 | </CENTER> |
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| 87 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 88 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 89 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 90 | Packages that use <A HREF="../../../../org/apache/hadoop/mapreduce/package-summary.html">org.apache.hadoop.mapreduce</A></FONT></TH> |
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| 91 | </TR> |
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| 92 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 93 | <TD><A HREF="#org.apache.hadoop.examples"><B>org.apache.hadoop.examples</B></A></TD> |
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| 94 | <TD>Hadoop example code. </TD> |
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| 95 | </TR> |
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| 96 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 97 | <TD><A HREF="#org.apache.hadoop.mapred"><B>org.apache.hadoop.mapred</B></A></TD> |
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| 98 | <TD>A software framework for easily writing applications which process vast |
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| 99 | amounts of data (multi-terabyte data-sets) parallelly on large clusters |
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| 100 | (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant |
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| 101 | manner. </TD> |
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| 102 | </TR> |
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| 103 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 104 | <TD><A HREF="#org.apache.hadoop.mapreduce"><B>org.apache.hadoop.mapreduce</B></A></TD> |
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| 105 | <TD> </TD> |
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| 106 | </TR> |
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| 107 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 108 | <TD><A HREF="#org.apache.hadoop.mapreduce.lib.input"><B>org.apache.hadoop.mapreduce.lib.input</B></A></TD> |
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| 109 | <TD> </TD> |
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| 110 | </TR> |
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| 111 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 112 | <TD><A HREF="#org.apache.hadoop.mapreduce.lib.map"><B>org.apache.hadoop.mapreduce.lib.map</B></A></TD> |
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| 113 | <TD> </TD> |
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| 114 | </TR> |
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| 115 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 116 | <TD><A HREF="#org.apache.hadoop.mapreduce.lib.output"><B>org.apache.hadoop.mapreduce.lib.output</B></A></TD> |
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| 117 | <TD> </TD> |
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| 118 | </TR> |
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| 119 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 120 | <TD><A HREF="#org.apache.hadoop.mapreduce.lib.partition"><B>org.apache.hadoop.mapreduce.lib.partition</B></A></TD> |
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| 121 | <TD> </TD> |
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| 122 | </TR> |
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| 123 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 124 | <TD><A HREF="#org.apache.hadoop.mapreduce.lib.reduce"><B>org.apache.hadoop.mapreduce.lib.reduce</B></A></TD> |
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| 125 | <TD> </TD> |
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| 126 | </TR> |
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| 127 | </TABLE> |
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| 128 | |
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| 129 | <P> |
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| 130 | <A NAME="org.apache.hadoop.examples"><!-- --></A> |
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| 131 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 132 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 133 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 134 | Classes in <A HREF="../../../../org/apache/hadoop/mapreduce/package-summary.html">org.apache.hadoop.mapreduce</A> used by <A HREF="../../../../org/apache/hadoop/examples/package-summary.html">org.apache.hadoop.examples</A></FONT></TH> |
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| 135 | </TR> |
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| 136 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 137 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Mapper.html#org.apache.hadoop.examples"><B>Mapper</B></A></B> |
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| 138 | |
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| 139 | <BR> |
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| 140 | Maps input key/value pairs to a set of intermediate key/value pairs.</TD> |
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| 141 | </TR> |
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| 142 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 143 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Mapper.Context.html#org.apache.hadoop.examples"><B>Mapper.Context</B></A></B> |
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| 144 | |
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| 145 | <BR> |
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| 146 | </TD> |
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| 147 | </TR> |
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| 148 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 149 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Partitioner.html#org.apache.hadoop.examples"><B>Partitioner</B></A></B> |
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| 150 | |
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| 151 | <BR> |
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| 152 | Partitions the key space.</TD> |
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| 153 | </TR> |
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| 154 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 155 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Reducer.html#org.apache.hadoop.examples"><B>Reducer</B></A></B> |
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| 156 | |
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| 157 | <BR> |
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| 158 | Reduces a set of intermediate values which share a key to a smaller set of |
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| 159 | values.</TD> |
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| 160 | </TR> |
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| 161 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 162 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Reducer.Context.html#org.apache.hadoop.examples"><B>Reducer.Context</B></A></B> |
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| 163 | |
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| 164 | <BR> |
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| 165 | </TD> |
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| 166 | </TR> |
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| 167 | </TABLE> |
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| 168 | |
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| 169 | <P> |
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| 170 | <A NAME="org.apache.hadoop.mapred"><!-- --></A> |
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| 171 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 172 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 173 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 174 | Classes in <A HREF="../../../../org/apache/hadoop/mapreduce/package-summary.html">org.apache.hadoop.mapreduce</A> used by <A HREF="../../../../org/apache/hadoop/mapred/package-summary.html">org.apache.hadoop.mapred</A></FONT></TH> |
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| 175 | </TR> |
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| 176 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 177 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Counter.html#org.apache.hadoop.mapred"><B>Counter</B></A></B> |
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| 178 | |
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| 179 | <BR> |
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| 180 | A named counter that tracks the progress of a map/reduce job.</TD> |
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| 181 | </TR> |
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| 182 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 183 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/ID.html#org.apache.hadoop.mapred"><B>ID</B></A></B> |
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| 184 | |
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| 185 | <BR> |
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| 186 | A general identifier, which internally stores the id |
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| 187 | as an integer.</TD> |
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| 188 | </TR> |
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| 189 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 190 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/InputSplit.html#org.apache.hadoop.mapred"><B>InputSplit</B></A></B> |
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| 191 | |
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| 192 | <BR> |
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| 193 | <code>InputSplit</code> represents the data to be processed by an |
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| 194 | individual <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A>.</TD> |
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| 195 | </TR> |
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| 196 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 197 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/JobContext.html#org.apache.hadoop.mapred"><B>JobContext</B></A></B> |
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| 198 | |
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| 199 | <BR> |
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| 200 | A read-only view of the job that is provided to the tasks while they |
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| 201 | are running.</TD> |
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| 202 | </TR> |
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| 203 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 204 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/JobID.html#org.apache.hadoop.mapred"><B>JobID</B></A></B> |
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| 205 | |
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| 206 | <BR> |
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| 207 | JobID represents the immutable and unique identifier for |
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| 208 | the job.</TD> |
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| 209 | </TR> |
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| 210 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 211 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/OutputCommitter.html#org.apache.hadoop.mapred"><B>OutputCommitter</B></A></B> |
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| 212 | |
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| 213 | <BR> |
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| 214 | <code>OutputCommitter</code> describes the commit of task output for a |
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| 215 | Map-Reduce job.</TD> |
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| 216 | </TR> |
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| 217 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 218 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/TaskAttemptContext.html#org.apache.hadoop.mapred"><B>TaskAttemptContext</B></A></B> |
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| 219 | |
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| 220 | <BR> |
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| 221 | The context for task attempts.</TD> |
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| 222 | </TR> |
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| 223 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 224 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/TaskAttemptID.html#org.apache.hadoop.mapred"><B>TaskAttemptID</B></A></B> |
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| 225 | |
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| 226 | <BR> |
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| 227 | TaskAttemptID represents the immutable and unique identifier for |
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| 228 | a task attempt.</TD> |
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| 229 | </TR> |
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| 230 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 231 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/TaskID.html#org.apache.hadoop.mapred"><B>TaskID</B></A></B> |
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| 232 | |
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| 233 | <BR> |
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| 234 | TaskID represents the immutable and unique identifier for |
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| 235 | a Map or Reduce Task.</TD> |
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| 236 | </TR> |
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| 237 | </TABLE> |
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| 238 | |
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| 239 | <P> |
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| 240 | <A NAME="org.apache.hadoop.mapreduce"><!-- --></A> |
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| 241 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 242 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 243 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 244 | Classes in <A HREF="../../../../org/apache/hadoop/mapreduce/package-summary.html">org.apache.hadoop.mapreduce</A> used by <A HREF="../../../../org/apache/hadoop/mapreduce/package-summary.html">org.apache.hadoop.mapreduce</A></FONT></TH> |
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| 245 | </TR> |
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| 246 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 247 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Counter.html#org.apache.hadoop.mapreduce"><B>Counter</B></A></B> |
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| 248 | |
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| 249 | <BR> |
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| 250 | A named counter that tracks the progress of a map/reduce job.</TD> |
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| 251 | </TR> |
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| 252 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 253 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/CounterGroup.html#org.apache.hadoop.mapreduce"><B>CounterGroup</B></A></B> |
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| 254 | |
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| 255 | <BR> |
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| 256 | A group of <A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html" title="class in org.apache.hadoop.mapreduce"><CODE>Counter</CODE></A>s that logically belong together.</TD> |
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| 257 | </TR> |
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| 258 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 259 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Counters.html#org.apache.hadoop.mapreduce"><B>Counters</B></A></B> |
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| 260 | |
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| 261 | <BR> |
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| 262 | </TD> |
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| 263 | </TR> |
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| 264 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 265 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/ID.html#org.apache.hadoop.mapreduce"><B>ID</B></A></B> |
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| 266 | |
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| 267 | <BR> |
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| 268 | A general identifier, which internally stores the id |
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| 269 | as an integer.</TD> |
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| 270 | </TR> |
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| 271 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 272 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/InputFormat.html#org.apache.hadoop.mapreduce"><B>InputFormat</B></A></B> |
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| 273 | |
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| 274 | <BR> |
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| 275 | <code>InputFormat</code> describes the input-specification for a |
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| 276 | Map-Reduce job.</TD> |
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| 277 | </TR> |
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| 278 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 279 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/InputSplit.html#org.apache.hadoop.mapreduce"><B>InputSplit</B></A></B> |
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| 280 | |
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| 281 | <BR> |
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| 282 | <code>InputSplit</code> represents the data to be processed by an |
|---|
| 283 | individual <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A>.</TD> |
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| 284 | </TR> |
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| 285 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 286 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Job.JobState.html#org.apache.hadoop.mapreduce"><B>Job.JobState</B></A></B> |
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| 287 | |
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| 288 | <BR> |
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| 289 | </TD> |
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| 290 | </TR> |
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| 291 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 292 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/JobContext.html#org.apache.hadoop.mapreduce"><B>JobContext</B></A></B> |
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| 293 | |
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| 294 | <BR> |
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| 295 | A read-only view of the job that is provided to the tasks while they |
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| 296 | are running.</TD> |
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| 297 | </TR> |
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| 298 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 299 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/JobID.html#org.apache.hadoop.mapreduce"><B>JobID</B></A></B> |
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| 300 | |
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| 301 | <BR> |
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| 302 | JobID represents the immutable and unique identifier for |
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| 303 | the job.</TD> |
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| 304 | </TR> |
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| 305 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 306 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/MapContext.html#org.apache.hadoop.mapreduce"><B>MapContext</B></A></B> |
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| 307 | |
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| 308 | <BR> |
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| 309 | The context that is given to the <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A>.</TD> |
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| 310 | </TR> |
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| 311 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 312 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Mapper.html#org.apache.hadoop.mapreduce"><B>Mapper</B></A></B> |
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| 313 | |
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| 314 | <BR> |
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| 315 | Maps input key/value pairs to a set of intermediate key/value pairs.</TD> |
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| 316 | </TR> |
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| 317 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 318 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Mapper.Context.html#org.apache.hadoop.mapreduce"><B>Mapper.Context</B></A></B> |
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| 319 | |
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| 320 | <BR> |
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| 321 | </TD> |
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| 322 | </TR> |
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| 323 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 324 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/OutputCommitter.html#org.apache.hadoop.mapreduce"><B>OutputCommitter</B></A></B> |
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| 325 | |
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| 326 | <BR> |
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| 327 | <code>OutputCommitter</code> describes the commit of task output for a |
|---|
| 328 | Map-Reduce job.</TD> |
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| 329 | </TR> |
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| 330 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 331 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/OutputFormat.html#org.apache.hadoop.mapreduce"><B>OutputFormat</B></A></B> |
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| 332 | |
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| 333 | <BR> |
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| 334 | <code>OutputFormat</code> describes the output-specification for a |
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| 335 | Map-Reduce job.</TD> |
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| 336 | </TR> |
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| 337 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 338 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Partitioner.html#org.apache.hadoop.mapreduce"><B>Partitioner</B></A></B> |
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| 339 | |
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| 340 | <BR> |
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| 341 | Partitions the key space.</TD> |
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| 342 | </TR> |
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| 343 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 344 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/RecordReader.html#org.apache.hadoop.mapreduce"><B>RecordReader</B></A></B> |
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| 345 | |
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| 346 | <BR> |
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| 347 | The record reader breaks the data into key/value pairs for input to the |
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| 348 | <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A>.</TD> |
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| 349 | </TR> |
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| 350 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 351 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/RecordWriter.html#org.apache.hadoop.mapreduce"><B>RecordWriter</B></A></B> |
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| 352 | |
|---|
| 353 | <BR> |
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| 354 | <code>RecordWriter</code> writes the output <key, value> pairs |
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| 355 | to an output file.</TD> |
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| 356 | </TR> |
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| 357 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 358 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/ReduceContext.html#org.apache.hadoop.mapreduce"><B>ReduceContext</B></A></B> |
|---|
| 359 | |
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| 360 | <BR> |
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| 361 | The context passed to the <A HREF="../../../../org/apache/hadoop/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce"><CODE>Reducer</CODE></A>.</TD> |
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| 362 | </TR> |
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| 363 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 364 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Reducer.html#org.apache.hadoop.mapreduce"><B>Reducer</B></A></B> |
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| 365 | |
|---|
| 366 | <BR> |
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| 367 | Reduces a set of intermediate values which share a key to a smaller set of |
|---|
| 368 | values.</TD> |
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| 369 | </TR> |
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| 370 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 371 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Reducer.Context.html#org.apache.hadoop.mapreduce"><B>Reducer.Context</B></A></B> |
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| 372 | |
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| 373 | <BR> |
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| 374 | </TD> |
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| 375 | </TR> |
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| 376 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 377 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/StatusReporter.html#org.apache.hadoop.mapreduce"><B>StatusReporter</B></A></B> |
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| 378 | |
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| 379 | <BR> |
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| 380 | </TD> |
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| 381 | </TR> |
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| 382 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 383 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/TaskAttemptContext.html#org.apache.hadoop.mapreduce"><B>TaskAttemptContext</B></A></B> |
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| 384 | |
|---|
| 385 | <BR> |
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| 386 | The context for task attempts.</TD> |
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| 387 | </TR> |
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| 388 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 389 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/TaskAttemptID.html#org.apache.hadoop.mapreduce"><B>TaskAttemptID</B></A></B> |
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| 390 | |
|---|
| 391 | <BR> |
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| 392 | TaskAttemptID represents the immutable and unique identifier for |
|---|
| 393 | a task attempt.</TD> |
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| 394 | </TR> |
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| 395 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 396 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/TaskID.html#org.apache.hadoop.mapreduce"><B>TaskID</B></A></B> |
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| 397 | |
|---|
| 398 | <BR> |
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| 399 | TaskID represents the immutable and unique identifier for |
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| 400 | a Map or Reduce Task.</TD> |
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| 401 | </TR> |
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| 402 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 403 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/TaskInputOutputContext.html#org.apache.hadoop.mapreduce"><B>TaskInputOutputContext</B></A></B> |
|---|
| 404 | |
|---|
| 405 | <BR> |
|---|
| 406 | A context object that allows input and output from the task.</TD> |
|---|
| 407 | </TR> |
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| 408 | </TABLE> |
|---|
| 409 | |
|---|
| 410 | <P> |
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| 411 | <A NAME="org.apache.hadoop.mapreduce.lib.input"><!-- --></A> |
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| 412 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 413 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 414 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 415 | Classes in <A HREF="../../../../org/apache/hadoop/mapreduce/package-summary.html">org.apache.hadoop.mapreduce</A> used by <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/package-summary.html">org.apache.hadoop.mapreduce.lib.input</A></FONT></TH> |
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| 416 | </TR> |
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| 417 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 418 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/InputFormat.html#org.apache.hadoop.mapreduce.lib.input"><B>InputFormat</B></A></B> |
|---|
| 419 | |
|---|
| 420 | <BR> |
|---|
| 421 | <code>InputFormat</code> describes the input-specification for a |
|---|
| 422 | Map-Reduce job.</TD> |
|---|
| 423 | </TR> |
|---|
| 424 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 425 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/InputSplit.html#org.apache.hadoop.mapreduce.lib.input"><B>InputSplit</B></A></B> |
|---|
| 426 | |
|---|
| 427 | <BR> |
|---|
| 428 | <code>InputSplit</code> represents the data to be processed by an |
|---|
| 429 | individual <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A>.</TD> |
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| 430 | </TR> |
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| 431 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 432 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Job.html#org.apache.hadoop.mapreduce.lib.input"><B>Job</B></A></B> |
|---|
| 433 | |
|---|
| 434 | <BR> |
|---|
| 435 | The job submitter's view of the Job.</TD> |
|---|
| 436 | </TR> |
|---|
| 437 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 438 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/JobContext.html#org.apache.hadoop.mapreduce.lib.input"><B>JobContext</B></A></B> |
|---|
| 439 | |
|---|
| 440 | <BR> |
|---|
| 441 | A read-only view of the job that is provided to the tasks while they |
|---|
| 442 | are running.</TD> |
|---|
| 443 | </TR> |
|---|
| 444 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 445 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/RecordReader.html#org.apache.hadoop.mapreduce.lib.input"><B>RecordReader</B></A></B> |
|---|
| 446 | |
|---|
| 447 | <BR> |
|---|
| 448 | The record reader breaks the data into key/value pairs for input to the |
|---|
| 449 | <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A>.</TD> |
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| 450 | </TR> |
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| 451 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 452 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/TaskAttemptContext.html#org.apache.hadoop.mapreduce.lib.input"><B>TaskAttemptContext</B></A></B> |
|---|
| 453 | |
|---|
| 454 | <BR> |
|---|
| 455 | The context for task attempts.</TD> |
|---|
| 456 | </TR> |
|---|
| 457 | </TABLE> |
|---|
| 458 | |
|---|
| 459 | <P> |
|---|
| 460 | <A NAME="org.apache.hadoop.mapreduce.lib.map"><!-- --></A> |
|---|
| 461 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 462 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 463 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 464 | Classes in <A HREF="../../../../org/apache/hadoop/mapreduce/package-summary.html">org.apache.hadoop.mapreduce</A> used by <A HREF="../../../../org/apache/hadoop/mapreduce/lib/map/package-summary.html">org.apache.hadoop.mapreduce.lib.map</A></FONT></TH> |
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| 465 | </TR> |
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| 466 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 467 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Job.html#org.apache.hadoop.mapreduce.lib.map"><B>Job</B></A></B> |
|---|
| 468 | |
|---|
| 469 | <BR> |
|---|
| 470 | The job submitter's view of the Job.</TD> |
|---|
| 471 | </TR> |
|---|
| 472 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 473 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/JobContext.html#org.apache.hadoop.mapreduce.lib.map"><B>JobContext</B></A></B> |
|---|
| 474 | |
|---|
| 475 | <BR> |
|---|
| 476 | A read-only view of the job that is provided to the tasks while they |
|---|
| 477 | are running.</TD> |
|---|
| 478 | </TR> |
|---|
| 479 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 480 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Mapper.html#org.apache.hadoop.mapreduce.lib.map"><B>Mapper</B></A></B> |
|---|
| 481 | |
|---|
| 482 | <BR> |
|---|
| 483 | Maps input key/value pairs to a set of intermediate key/value pairs.</TD> |
|---|
| 484 | </TR> |
|---|
| 485 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 486 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Mapper.Context.html#org.apache.hadoop.mapreduce.lib.map"><B>Mapper.Context</B></A></B> |
|---|
| 487 | |
|---|
| 488 | <BR> |
|---|
| 489 | </TD> |
|---|
| 490 | </TR> |
|---|
| 491 | </TABLE> |
|---|
| 492 | |
|---|
| 493 | <P> |
|---|
| 494 | <A NAME="org.apache.hadoop.mapreduce.lib.output"><!-- --></A> |
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| 495 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
|---|
| 496 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 497 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 498 | Classes in <A HREF="../../../../org/apache/hadoop/mapreduce/package-summary.html">org.apache.hadoop.mapreduce</A> used by <A HREF="../../../../org/apache/hadoop/mapreduce/lib/output/package-summary.html">org.apache.hadoop.mapreduce.lib.output</A></FONT></TH> |
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| 499 | </TR> |
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| 500 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 501 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Job.html#org.apache.hadoop.mapreduce.lib.output"><B>Job</B></A></B> |
|---|
| 502 | |
|---|
| 503 | <BR> |
|---|
| 504 | The job submitter's view of the Job.</TD> |
|---|
| 505 | </TR> |
|---|
| 506 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 507 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/JobContext.html#org.apache.hadoop.mapreduce.lib.output"><B>JobContext</B></A></B> |
|---|
| 508 | |
|---|
| 509 | <BR> |
|---|
| 510 | A read-only view of the job that is provided to the tasks while they |
|---|
| 511 | are running.</TD> |
|---|
| 512 | </TR> |
|---|
| 513 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 514 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/OutputCommitter.html#org.apache.hadoop.mapreduce.lib.output"><B>OutputCommitter</B></A></B> |
|---|
| 515 | |
|---|
| 516 | <BR> |
|---|
| 517 | <code>OutputCommitter</code> describes the commit of task output for a |
|---|
| 518 | Map-Reduce job.</TD> |
|---|
| 519 | </TR> |
|---|
| 520 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 521 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/OutputFormat.html#org.apache.hadoop.mapreduce.lib.output"><B>OutputFormat</B></A></B> |
|---|
| 522 | |
|---|
| 523 | <BR> |
|---|
| 524 | <code>OutputFormat</code> describes the output-specification for a |
|---|
| 525 | Map-Reduce job.</TD> |
|---|
| 526 | </TR> |
|---|
| 527 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 528 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/RecordWriter.html#org.apache.hadoop.mapreduce.lib.output"><B>RecordWriter</B></A></B> |
|---|
| 529 | |
|---|
| 530 | <BR> |
|---|
| 531 | <code>RecordWriter</code> writes the output <key, value> pairs |
|---|
| 532 | to an output file.</TD> |
|---|
| 533 | </TR> |
|---|
| 534 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 535 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/TaskAttemptContext.html#org.apache.hadoop.mapreduce.lib.output"><B>TaskAttemptContext</B></A></B> |
|---|
| 536 | |
|---|
| 537 | <BR> |
|---|
| 538 | The context for task attempts.</TD> |
|---|
| 539 | </TR> |
|---|
| 540 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
|---|
| 541 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/TaskInputOutputContext.html#org.apache.hadoop.mapreduce.lib.output"><B>TaskInputOutputContext</B></A></B> |
|---|
| 542 | |
|---|
| 543 | <BR> |
|---|
| 544 | A context object that allows input and output from the task.</TD> |
|---|
| 545 | </TR> |
|---|
| 546 | </TABLE> |
|---|
| 547 | |
|---|
| 548 | <P> |
|---|
| 549 | <A NAME="org.apache.hadoop.mapreduce.lib.partition"><!-- --></A> |
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| 550 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 551 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 552 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 553 | Classes in <A HREF="../../../../org/apache/hadoop/mapreduce/package-summary.html">org.apache.hadoop.mapreduce</A> used by <A HREF="../../../../org/apache/hadoop/mapreduce/lib/partition/package-summary.html">org.apache.hadoop.mapreduce.lib.partition</A></FONT></TH> |
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| 554 | </TR> |
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| 555 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 556 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Partitioner.html#org.apache.hadoop.mapreduce.lib.partition"><B>Partitioner</B></A></B> |
|---|
| 557 | |
|---|
| 558 | <BR> |
|---|
| 559 | Partitions the key space.</TD> |
|---|
| 560 | </TR> |
|---|
| 561 | </TABLE> |
|---|
| 562 | |
|---|
| 563 | <P> |
|---|
| 564 | <A NAME="org.apache.hadoop.mapreduce.lib.reduce"><!-- --></A> |
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| 565 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 566 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 567 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 568 | Classes in <A HREF="../../../../org/apache/hadoop/mapreduce/package-summary.html">org.apache.hadoop.mapreduce</A> used by <A HREF="../../../../org/apache/hadoop/mapreduce/lib/reduce/package-summary.html">org.apache.hadoop.mapreduce.lib.reduce</A></FONT></TH> |
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| 569 | </TR> |
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| 570 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 571 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Reducer.html#org.apache.hadoop.mapreduce.lib.reduce"><B>Reducer</B></A></B> |
|---|
| 572 | |
|---|
| 573 | <BR> |
|---|
| 574 | Reduces a set of intermediate values which share a key to a smaller set of |
|---|
| 575 | values.</TD> |
|---|
| 576 | </TR> |
|---|
| 577 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 578 | <TD><B><A HREF="../../../../org/apache/hadoop/mapreduce/class-use/Reducer.Context.html#org.apache.hadoop.mapreduce.lib.reduce"><B>Reducer.Context</B></A></B> |
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| 579 | |
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| 580 | <BR> |
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| 581 | </TD> |
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