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| 7 | org.apache.hadoop.mapred (Hadoop 0.20.1 API) |
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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 |
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| 84 | </H2> |
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| 85 | A software framework for easily writing applications which process vast |
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| 86 | amounts of data (multi-terabyte data-sets) parallelly on large clusters |
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| 87 | (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant |
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| 88 | manner. |
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| 89 | <P> |
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| 90 | <B>See:</B> |
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| 91 | <BR> |
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| 92 | <A HREF="#package_description"><B>Description</B></A> |
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| 93 | <P> |
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| 94 | |
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| 95 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 96 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 97 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 98 | <B>Interface Summary</B></FONT></TH> |
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| 99 | </TR> |
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| 100 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 101 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat<K,V></A></B></TD> |
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| 102 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputFormat</CODE></A> instead.</I></TD> |
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| 103 | </TR> |
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| 104 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 105 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></B></TD> |
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| 106 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputSplit</CODE></A> instead.</I></TD> |
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| 107 | </TR> |
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| 108 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 109 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</A></B></TD> |
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| 110 | <TD><B>Deprecated.</B></TD> |
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| 111 | </TR> |
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| 112 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 113 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Listener.html" title="interface in org.apache.hadoop.mapred">JobHistory.Listener</A></B></TD> |
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| 114 | <TD>Callback interface for reading back log events from JobHistory.</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/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper<K1,V1,K2,V2></A></B></TD> |
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| 118 | <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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| 119 | </TR> |
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| 120 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 121 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MapRunnable.html" title="interface in org.apache.hadoop.mapred">MapRunnable<K1,V1,K2,V2></A></B></TD> |
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| 122 | <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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| 123 | </TR> |
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| 124 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 125 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector<K,V></A></B></TD> |
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| 126 | <TD>Collects the <code><key, value></code> pairs output by <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A>s |
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| 127 | and <A HREF="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><CODE>Reducer</CODE></A>s.</TD> |
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| 128 | </TR> |
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| 129 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 130 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat<K,V></A></B></TD> |
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| 131 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/OutputFormat.html" title="class in org.apache.hadoop.mapreduce"><CODE>OutputFormat</CODE></A> instead.</I></TD> |
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| 132 | </TR> |
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| 133 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 134 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Partitioner.html" title="interface in org.apache.hadoop.mapred">Partitioner<K2,V2></A></B></TD> |
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| 135 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce"><CODE>Partitioner</CODE></A> instead.</I></TD> |
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| 136 | </TR> |
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| 137 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 138 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/RawKeyValueIterator.html" title="interface in org.apache.hadoop.mapred">RawKeyValueIterator</A></B></TD> |
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| 139 | <TD><code>RawKeyValueIterator</code> is an iterator used to iterate over |
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| 140 | the raw keys and values during sort/merge of intermediate data.</TD> |
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| 141 | </TR> |
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| 142 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 143 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader<K,V></A></B></TD> |
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| 144 | <TD><code>RecordReader</code> reads <key, value> pairs from an |
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| 145 | <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>.</TD> |
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| 146 | </TR> |
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| 147 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 148 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred">RecordWriter<K,V></A></B></TD> |
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| 149 | <TD><code>RecordWriter</code> writes the output <key, value> pairs |
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| 150 | to an output file.</TD> |
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| 151 | </TR> |
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| 152 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 153 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer<K2,V2,K3,V3></A></B></TD> |
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| 154 | <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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| 155 | </TR> |
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| 156 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 157 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A></B></TD> |
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| 158 | <TD>A facility for Map-Reduce applications to report progress and update |
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| 159 | counters, status information etc.</TD> |
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| 160 | </TR> |
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| 161 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 162 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/RunningJob.html" title="interface in org.apache.hadoop.mapred">RunningJob</A></B></TD> |
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| 163 | <TD><code>RunningJob</code> is the user-interface to query for details on a |
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| 164 | running Map-Reduce job.</TD> |
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| 165 | </TR> |
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| 166 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 167 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.Filter.html" title="interface in org.apache.hadoop.mapred">SequenceFileInputFilter.Filter</A></B></TD> |
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| 168 | <TD>filter interface</TD> |
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| 169 | </TR> |
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| 170 | </TABLE> |
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| 171 | |
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| 172 | |
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| 173 | <P> |
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| 174 | |
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| 175 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 176 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 177 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 178 | <B>Class Summary</B></FONT></TH> |
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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/ClusterStatus.html" title="class in org.apache.hadoop.mapred">ClusterStatus</A></B></TD> |
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| 182 | <TD>Status information on the current state of the Map-Reduce cluster.</TD> |
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| 183 | </TR> |
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| 184 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 185 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.html" title="class in org.apache.hadoop.mapred">Counters</A></B></TD> |
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| 186 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/Counters.html" title="class in org.apache.hadoop.mapreduce"><CODE>Counters</CODE></A> instead.</I></TD> |
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| 187 | </TR> |
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| 188 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 189 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A></B></TD> |
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| 190 | <TD>A counter record, comprising its name and value.</TD> |
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| 191 | </TR> |
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| 192 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 193 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html" title="class in org.apache.hadoop.mapred">Counters.Group</A></B></TD> |
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| 194 | <TD><code>Group</code> of counters, comprising of counters from a particular |
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| 195 | counter <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang"><CODE>Enum</CODE></A> class.</TD> |
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| 196 | </TR> |
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| 197 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 198 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/DefaultJobHistoryParser.html" title="class in org.apache.hadoop.mapred">DefaultJobHistoryParser</A></B></TD> |
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| 199 | <TD>Default parser for job history files.</TD> |
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| 200 | </TR> |
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| 201 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 202 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">FileInputFormat<K,V></A></B></TD> |
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| 203 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/FileInputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>FileInputFormat</CODE></A> |
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| 204 | instead.</I></TD> |
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| 205 | </TR> |
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| 206 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 207 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/FileOutputCommitter.html" title="class in org.apache.hadoop.mapred">FileOutputCommitter</A></B></TD> |
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| 208 | <TD>An <A HREF="../../../../org/apache/hadoop/mapred/OutputCommitter.html" title="class in org.apache.hadoop.mapred"><CODE>OutputCommitter</CODE></A> that commits files specified |
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| 209 | in job output directory i.e.</TD> |
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| 210 | </TR> |
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| 211 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 212 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="class in org.apache.hadoop.mapred">FileOutputFormat<K,V></A></B></TD> |
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| 213 | <TD>A base class for <A HREF="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>OutputFormat</CODE></A>.</TD> |
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| 214 | </TR> |
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| 215 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 216 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/FileSplit.html" title="class in org.apache.hadoop.mapred">FileSplit</A></B></TD> |
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| 217 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/FileSplit.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>FileSplit</CODE></A> |
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| 218 | instead.</I></TD> |
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| 219 | </TR> |
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| 220 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 221 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/ID.html" title="class in org.apache.hadoop.mapred">ID</A></B></TD> |
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| 222 | <TD><B>Deprecated.</B></TD> |
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| 223 | </TR> |
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| 224 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 225 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/IsolationRunner.html" title="class in org.apache.hadoop.mapred">IsolationRunner</A></B></TD> |
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| 226 | <TD> </TD> |
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| 227 | </TR> |
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| 228 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 229 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobClient.html" title="class in org.apache.hadoop.mapred">JobClient</A></B></TD> |
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| 230 | <TD><code>JobClient</code> is the primary interface for the user-job to interact |
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| 231 | with the <A HREF="../../../../org/apache/hadoop/mapred/JobTracker.html" title="class in org.apache.hadoop.mapred"><CODE>JobTracker</CODE></A>.</TD> |
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| 232 | </TR> |
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| 233 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 234 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A></B></TD> |
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| 235 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf"><CODE>Configuration</CODE></A> instead</I></TD> |
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| 236 | </TR> |
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| 237 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 238 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobContext.html" title="class in org.apache.hadoop.mapred">JobContext</A></B></TD> |
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| 239 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce"><CODE>JobContext</CODE></A> instead.</I></TD> |
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| 240 | </TR> |
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| 241 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 242 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobEndNotifier.html" title="class in org.apache.hadoop.mapred">JobEndNotifier</A></B></TD> |
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| 243 | <TD> </TD> |
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| 244 | </TR> |
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| 245 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 246 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.html" title="class in org.apache.hadoop.mapred">JobHistory</A></B></TD> |
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| 247 | <TD>Provides methods for writing to and reading from job history.</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/JobHistory.HistoryCleaner.html" title="class in org.apache.hadoop.mapred">JobHistory.HistoryCleaner</A></B></TD> |
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| 251 | <TD>Delete history files older than one month.</TD> |
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| 252 | </TR> |
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| 253 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 254 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.JobInfo.html" title="class in org.apache.hadoop.mapred">JobHistory.JobInfo</A></B></TD> |
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| 255 | <TD>Helper class for logging or reading back events related to job start, finish or failure.</TD> |
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| 256 | </TR> |
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| 257 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 258 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.MapAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.MapAttempt</A></B></TD> |
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| 259 | <TD>Helper class for logging or reading back events related to start, finish or failure of |
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| 260 | a Map Attempt on a node.</TD> |
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| 261 | </TR> |
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| 262 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 263 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.ReduceAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.ReduceAttempt</A></B></TD> |
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| 264 | <TD>Helper class for logging or reading back events related to start, finish or failure of |
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| 265 | a Map Attempt on a node.</TD> |
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| 266 | </TR> |
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| 267 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 268 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Task.html" title="class in org.apache.hadoop.mapred">JobHistory.Task</A></B></TD> |
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| 269 | <TD>Helper class for logging or reading back events related to Task's start, finish or failure.</TD> |
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| 270 | </TR> |
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| 271 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 272 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.TaskAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.TaskAttempt</A></B></TD> |
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| 273 | <TD>Base class for Map and Reduce TaskAttempts.</TD> |
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| 274 | </TR> |
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| 275 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 276 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobID.html" title="class in org.apache.hadoop.mapred">JobID</A></B></TD> |
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| 277 | <TD><B>Deprecated.</B></TD> |
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| 278 | </TR> |
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| 279 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 280 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobProfile.html" title="class in org.apache.hadoop.mapred">JobProfile</A></B></TD> |
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| 281 | <TD>A JobProfile is a MapReduce primitive.</TD> |
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| 282 | </TR> |
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| 283 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 284 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobQueueInfo.html" title="class in org.apache.hadoop.mapred">JobQueueInfo</A></B></TD> |
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| 285 | <TD>Class that contains the information regarding the Job Queues which are |
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| 286 | maintained by the Hadoop Map/Reduce framework.</TD> |
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| 287 | </TR> |
---|
| 288 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 289 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobStatus.html" title="class in org.apache.hadoop.mapred">JobStatus</A></B></TD> |
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| 290 | <TD>Describes the current status of a job.</TD> |
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| 291 | </TR> |
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| 292 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 293 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobTracker.html" title="class in org.apache.hadoop.mapred">JobTracker</A></B></TD> |
---|
| 294 | <TD>JobTracker is the central location for submitting and |
---|
| 295 | tracking MR jobs in a network environment.</TD> |
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| 296 | </TR> |
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| 297 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 298 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html" title="class in org.apache.hadoop.mapred">KeyValueLineRecordReader</A></B></TD> |
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| 299 | <TD>This class treats a line in the input as a key/value pair separated by a |
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| 300 | separator character.</TD> |
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| 301 | </TR> |
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| 302 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 303 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueTextInputFormat.html" title="class in org.apache.hadoop.mapred">KeyValueTextInputFormat</A></B></TD> |
---|
| 304 | <TD>An <A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A> for plain text files.</TD> |
---|
| 305 | </TR> |
---|
| 306 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 307 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/LineRecordReader.html" title="class in org.apache.hadoop.mapred">LineRecordReader</A></B></TD> |
---|
| 308 | <TD><B>Deprecated.</B> <I>Use |
---|
| 309 | <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/LineRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>LineRecordReader</CODE></A> instead.</I></TD> |
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| 310 | </TR> |
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| 311 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 312 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/LineRecordReader.LineReader.html" title="class in org.apache.hadoop.mapred">LineRecordReader.LineReader</A></B></TD> |
---|
| 313 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/util/LineReader.html" title="class in org.apache.hadoop.util"><CODE>LineReader</CODE></A> instead.</I></TD> |
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| 314 | </TR> |
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| 315 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 316 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MapFileOutputFormat.html" title="class in org.apache.hadoop.mapred">MapFileOutputFormat</A></B></TD> |
---|
| 317 | <TD>An <A HREF="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>OutputFormat</CODE></A> that writes <A HREF="../../../../org/apache/hadoop/io/MapFile.html" title="class in org.apache.hadoop.io"><CODE>MapFile</CODE></A>s.</TD> |
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| 318 | </TR> |
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| 319 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 320 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MapReduceBase.html" title="class in org.apache.hadoop.mapred">MapReduceBase</A></B></TD> |
---|
| 321 | <TD><B>Deprecated.</B></TD> |
---|
| 322 | </TR> |
---|
| 323 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 324 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MapReducePolicyProvider.html" title="class in org.apache.hadoop.mapred">MapReducePolicyProvider</A></B></TD> |
---|
| 325 | <TD><A HREF="../../../../org/apache/hadoop/security/authorize/PolicyProvider.html" title="class in org.apache.hadoop.security.authorize"><CODE>PolicyProvider</CODE></A> for Map-Reduce protocols.</TD> |
---|
| 326 | </TR> |
---|
| 327 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 328 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MapRunner.html" title="class in org.apache.hadoop.mapred">MapRunner<K1,V1,K2,V2></A></B></TD> |
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| 329 | <TD>Default <A HREF="../../../../org/apache/hadoop/mapred/MapRunnable.html" title="interface in org.apache.hadoop.mapred"><CODE>MapRunnable</CODE></A> implementation.</TD> |
---|
| 330 | </TR> |
---|
| 331 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 332 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MultiFileInputFormat.html" title="class in org.apache.hadoop.mapred">MultiFileInputFormat<K,V></A></B></TD> |
---|
| 333 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapred/lib/CombineFileInputFormat.html" title="class in org.apache.hadoop.mapred.lib"><CODE>CombineFileInputFormat</CODE></A> instead</I></TD> |
---|
| 334 | </TR> |
---|
| 335 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 336 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/MultiFileSplit.html" title="class in org.apache.hadoop.mapred">MultiFileSplit</A></B></TD> |
---|
| 337 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapred/lib/CombineFileSplit.html" title="class in org.apache.hadoop.mapred.lib"><CODE>CombineFileSplit</CODE></A> instead</I></TD> |
---|
| 338 | </TR> |
---|
| 339 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 340 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/OutputCommitter.html" title="class in org.apache.hadoop.mapred">OutputCommitter</A></B></TD> |
---|
| 341 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/OutputCommitter.html" title="class in org.apache.hadoop.mapreduce"><CODE>OutputCommitter</CODE></A> instead.</I></TD> |
---|
| 342 | </TR> |
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| 343 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 344 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/OutputLogFilter.html" title="class in org.apache.hadoop.mapred">OutputLogFilter</A></B></TD> |
---|
| 345 | <TD>This class filters log files from directory given |
---|
| 346 | It doesnt accept paths having _logs.</TD> |
---|
| 347 | </TR> |
---|
| 348 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 349 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryInputFormat</A></B></TD> |
---|
| 350 | <TD>InputFormat reading keys, values from SequenceFiles in binary (raw) |
---|
| 351 | format.</TD> |
---|
| 352 | </TR> |
---|
| 353 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 354 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader</A></B></TD> |
---|
| 355 | <TD>Read records from a SequenceFile as binary (raw) bytes.</TD> |
---|
| 356 | </TR> |
---|
| 357 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 358 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryOutputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryOutputFormat</A></B></TD> |
---|
| 359 | <TD>An <A HREF="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>OutputFormat</CODE></A> that writes keys, values to |
---|
| 360 | <A HREF="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile</CODE></A>s in binary(raw) format</TD> |
---|
| 361 | </TR> |
---|
| 362 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 363 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryOutputFormat.WritableValueBytes.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryOutputFormat.WritableValueBytes</A></B></TD> |
---|
| 364 | <TD>Inner class used for appendRaw</TD> |
---|
| 365 | </TR> |
---|
| 366 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 367 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsTextInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsTextInputFormat</A></B></TD> |
---|
| 368 | <TD>This class is similar to SequenceFileInputFormat, except it generates SequenceFileAsTextRecordReader |
---|
| 369 | which converts the input keys and values to their String forms by calling toString() method.</TD> |
---|
| 370 | </TR> |
---|
| 371 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 372 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsTextRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileAsTextRecordReader</A></B></TD> |
---|
| 373 | <TD>This class converts the input keys and values to their String forms by calling toString() |
---|
| 374 | method.</TD> |
---|
| 375 | </TR> |
---|
| 376 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 377 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter<K,V></A></B></TD> |
---|
| 378 | <TD>A class that allows a map/red job to work on a sample of sequence files.</TD> |
---|
| 379 | </TR> |
---|
| 380 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 381 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.FilterBase.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter.FilterBase</A></B></TD> |
---|
| 382 | <TD>base class for Filters</TD> |
---|
| 383 | </TR> |
---|
| 384 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 385 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.MD5Filter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter.MD5Filter</A></B></TD> |
---|
| 386 | <TD>This class returns a set of records by examing the MD5 digest of its |
---|
| 387 | key against a filtering frequency <i>f</i>.</TD> |
---|
| 388 | </TR> |
---|
| 389 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 390 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.PercentFilter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter.PercentFilter</A></B></TD> |
---|
| 391 | <TD>This class returns a percentage of records |
---|
| 392 | The percentage is determined by a filtering frequency <i>f</i> using |
---|
| 393 | the criteria record# % f == 0.</TD> |
---|
| 394 | </TR> |
---|
| 395 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 396 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.RegexFilter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter.RegexFilter</A></B></TD> |
---|
| 397 | <TD>Records filter by matching key to regex</TD> |
---|
| 398 | </TR> |
---|
| 399 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 400 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFormat<K,V></A></B></TD> |
---|
| 401 | <TD><B>Deprecated.</B> <I>Use |
---|
| 402 | <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/SequenceFileInputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>SequenceFileInputFormat</CODE></A> |
---|
| 403 | instead.</I></TD> |
---|
| 404 | </TR> |
---|
| 405 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 406 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileOutputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileOutputFormat<K,V></A></B></TD> |
---|
| 407 | <TD><B>Deprecated.</B> <I>Use |
---|
| 408 | <A HREF="../../../../org/apache/hadoop/mapreduce/lib/output/SequenceFileOutputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.output"><CODE>SequenceFileOutputFormat</CODE></A> |
---|
| 409 | instead.</I></TD> |
---|
| 410 | </TR> |
---|
| 411 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 412 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SequenceFileRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileRecordReader<K,V></A></B></TD> |
---|
| 413 | <TD>An <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> for <A HREF="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile</CODE></A>s.</TD> |
---|
| 414 | </TR> |
---|
| 415 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 416 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html" title="class in org.apache.hadoop.mapred">SkipBadRecords</A></B></TD> |
---|
| 417 | <TD>Utility class for skip bad records functionality.</TD> |
---|
| 418 | </TR> |
---|
| 419 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 420 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptContext.html" title="class in org.apache.hadoop.mapred">TaskAttemptContext</A></B></TD> |
---|
| 421 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce"><CODE>TaskAttemptContext</CODE></A> |
---|
| 422 | instead.</I></TD> |
---|
| 423 | </TR> |
---|
| 424 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 425 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A></B></TD> |
---|
| 426 | <TD><B>Deprecated.</B></TD> |
---|
| 427 | </TR> |
---|
| 428 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 429 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskCompletionEvent.html" title="class in org.apache.hadoop.mapred">TaskCompletionEvent</A></B></TD> |
---|
| 430 | <TD>This is used to track task completion events on |
---|
| 431 | job tracker.</TD> |
---|
| 432 | </TR> |
---|
| 433 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 434 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskGraphServlet.html" title="class in org.apache.hadoop.mapred">TaskGraphServlet</A></B></TD> |
---|
| 435 | <TD>The servlet that outputs svg graphics for map / reduce task |
---|
| 436 | statuses</TD> |
---|
| 437 | </TR> |
---|
| 438 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 439 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskID.html" title="class in org.apache.hadoop.mapred">TaskID</A></B></TD> |
---|
| 440 | <TD><B>Deprecated.</B></TD> |
---|
| 441 | </TR> |
---|
| 442 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 443 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskLog.html" title="class in org.apache.hadoop.mapred">TaskLog</A></B></TD> |
---|
| 444 | <TD>A simple logger to handle the task-specific user logs.</TD> |
---|
| 445 | </TR> |
---|
| 446 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 447 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskLogAppender.html" title="class in org.apache.hadoop.mapred">TaskLogAppender</A></B></TD> |
---|
| 448 | <TD>A simple log4j-appender for the task child's |
---|
| 449 | map-reduce system logs.</TD> |
---|
| 450 | </TR> |
---|
| 451 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 452 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskLogServlet.html" title="class in org.apache.hadoop.mapred">TaskLogServlet</A></B></TD> |
---|
| 453 | <TD>A servlet that is run by the TaskTrackers to provide the task logs via http.</TD> |
---|
| 454 | </TR> |
---|
| 455 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 456 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskReport.html" title="class in org.apache.hadoop.mapred">TaskReport</A></B></TD> |
---|
| 457 | <TD>A report on the state of a task.</TD> |
---|
| 458 | </TR> |
---|
| 459 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 460 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html" title="class in org.apache.hadoop.mapred">TaskTracker</A></B></TD> |
---|
| 461 | <TD>TaskTracker is a process that starts and tracks MR Tasks |
---|
| 462 | in a networked environment.</TD> |
---|
| 463 | </TR> |
---|
| 464 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 465 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.MapOutputServlet.html" title="class in org.apache.hadoop.mapred">TaskTracker.MapOutputServlet</A></B></TD> |
---|
| 466 | <TD>This class is used in TaskTracker's Jetty to serve the map outputs |
---|
| 467 | to other nodes.</TD> |
---|
| 468 | </TR> |
---|
| 469 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 470 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TextInputFormat.html" title="class in org.apache.hadoop.mapred">TextInputFormat</A></B></TD> |
---|
| 471 | <TD><B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/TextInputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>TextInputFormat</CODE></A> |
---|
| 472 | instead.</I></TD> |
---|
| 473 | </TR> |
---|
| 474 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 475 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TextOutputFormat.html" title="class in org.apache.hadoop.mapred">TextOutputFormat<K,V></A></B></TD> |
---|
| 476 | <TD><B>Deprecated.</B> <I>Use |
---|
| 477 | <A HREF="../../../../org/apache/hadoop/mapreduce/lib/output/TextOutputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.output"><CODE>TextOutputFormat</CODE></A> instead.</I></TD> |
---|
| 478 | </TR> |
---|
| 479 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 480 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TextOutputFormat.LineRecordWriter.html" title="class in org.apache.hadoop.mapred">TextOutputFormat.LineRecordWriter<K,V></A></B></TD> |
---|
| 481 | <TD> </TD> |
---|
| 482 | </TR> |
---|
| 483 | </TABLE> |
---|
| 484 | |
---|
| 485 | |
---|
| 486 | <P> |
---|
| 487 | |
---|
| 488 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
---|
| 489 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
---|
| 490 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
---|
| 491 | <B>Enum Summary</B></FONT></TH> |
---|
| 492 | </TR> |
---|
| 493 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 494 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobClient.TaskStatusFilter.html" title="enum in org.apache.hadoop.mapred">JobClient.TaskStatusFilter</A></B></TD> |
---|
| 495 | <TD> </TD> |
---|
| 496 | </TR> |
---|
| 497 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 498 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Keys.html" title="enum in org.apache.hadoop.mapred">JobHistory.Keys</A></B></TD> |
---|
| 499 | <TD>Job history files contain key="value" pairs, where keys belong to this enum.</TD> |
---|
| 500 | </TR> |
---|
| 501 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 502 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.RecordTypes.html" title="enum in org.apache.hadoop.mapred">JobHistory.RecordTypes</A></B></TD> |
---|
| 503 | <TD>Record types are identifiers for each line of log in history files.</TD> |
---|
| 504 | </TR> |
---|
| 505 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 506 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Values.html" title="enum in org.apache.hadoop.mapred">JobHistory.Values</A></B></TD> |
---|
| 507 | <TD>This enum contains some of the values commonly used by history log events.</TD> |
---|
| 508 | </TR> |
---|
| 509 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 510 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobPriority.html" title="enum in org.apache.hadoop.mapred">JobPriority</A></B></TD> |
---|
| 511 | <TD>Used to describe the priority of the running job.</TD> |
---|
| 512 | </TR> |
---|
| 513 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 514 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobTracker.State.html" title="enum in org.apache.hadoop.mapred">JobTracker.State</A></B></TD> |
---|
| 515 | <TD> </TD> |
---|
| 516 | </TR> |
---|
| 517 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 518 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskCompletionEvent.Status.html" title="enum in org.apache.hadoop.mapred">TaskCompletionEvent.Status</A></B></TD> |
---|
| 519 | <TD> </TD> |
---|
| 520 | </TR> |
---|
| 521 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 522 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TaskLog.LogName.html" title="enum in org.apache.hadoop.mapred">TaskLog.LogName</A></B></TD> |
---|
| 523 | <TD>The filter for userlogs.</TD> |
---|
| 524 | </TR> |
---|
| 525 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 526 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/TIPStatus.html" title="enum in org.apache.hadoop.mapred">TIPStatus</A></B></TD> |
---|
| 527 | <TD>The states of a <CODE>TaskInProgress</CODE> as seen by the JobTracker.</TD> |
---|
| 528 | </TR> |
---|
| 529 | </TABLE> |
---|
| 530 | |
---|
| 531 | |
---|
| 532 | <P> |
---|
| 533 | |
---|
| 534 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
---|
| 535 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
---|
| 536 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
---|
| 537 | <B>Exception Summary</B></FONT></TH> |
---|
| 538 | </TR> |
---|
| 539 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 540 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/FileAlreadyExistsException.html" title="class in org.apache.hadoop.mapred">FileAlreadyExistsException</A></B></TD> |
---|
| 541 | <TD>Used when target file already exists for any operation and |
---|
| 542 | is not configured to be overwritten.</TD> |
---|
| 543 | </TR> |
---|
| 544 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 545 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/InvalidFileTypeException.html" title="class in org.apache.hadoop.mapred">InvalidFileTypeException</A></B></TD> |
---|
| 546 | <TD>Used when file type differs from the desired file type.</TD> |
---|
| 547 | </TR> |
---|
| 548 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
---|
| 549 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/InvalidInputException.html" title="class in org.apache.hadoop.mapred">InvalidInputException</A></B></TD> |
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| 550 | <TD>This class wraps a list of problems with the input, so that the user |
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| 551 | can get a list of problems together instead of finding and fixing them one |
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| 552 | by one.</TD> |
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| 553 | </TR> |
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| 554 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 555 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/InvalidJobConfException.html" title="class in org.apache.hadoop.mapred">InvalidJobConfException</A></B></TD> |
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| 556 | <TD>This exception is thrown when jobconf misses some mendatory attributes |
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| 557 | or value of some attributes is invalid.</TD> |
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| 558 | </TR> |
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| 559 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 560 | <TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/mapred/JobTracker.IllegalStateException.html" title="class in org.apache.hadoop.mapred">JobTracker.IllegalStateException</A></B></TD> |
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| 561 | <TD>A client tried to submit a job before the Job Tracker was ready.</TD> |
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| 562 | </TR> |
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| 563 | </TABLE> |
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| 564 | |
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| 565 | |
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| 566 | <P> |
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| 567 | <A NAME="package_description"><!-- --></A><H2> |
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| 568 | Package org.apache.hadoop.mapred Description |
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| 569 | </H2> |
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| 570 | |
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| 571 | <P> |
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| 572 | <p>A software framework for easily writing applications which process vast |
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| 573 | amounts of data (multi-terabyte data-sets) parallelly on large clusters |
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| 574 | (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant |
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| 575 | manner.</p> |
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| 576 | |
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| 577 | <p>A Map-Reduce <i>job</i> usually splits the input data-set into independent |
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| 578 | chunks which processed by <i>map</i> tasks in completely parallel manner, |
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| 579 | followed by <i>reduce</i> tasks which aggregating their output. Typically both |
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| 580 | the input and the output of the job are stored in a |
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| 581 | <A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs"><CODE>FileSystem</CODE></A>. The framework takes care of monitoring |
---|
| 582 | tasks and re-executing failed ones. Since, usually, the compute nodes and the |
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| 583 | storage nodes are the same i.e. Hadoop's Map-Reduce framework and Distributed |
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| 584 | FileSystem are running on the same set of nodes, tasks are effectively scheduled |
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| 585 | on the nodes where data is already present, resulting in very high aggregate |
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| 586 | bandwidth across the cluster.</p> |
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| 587 | |
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| 588 | <p>The Map-Reduce framework operates exclusively on <tt><key, value></tt> |
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| 589 | pairs i.e. the input to the job is viewed as a set of <tt><key, value></tt> |
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| 590 | pairs and the output as another, possibly different, set of |
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| 591 | <tt><key, value></tt> pairs. The <tt>key</tt>s and <tt>value</tt>s have to |
---|
| 592 | be serializable as <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io"><CODE>Writable</CODE></A>s and additionally the |
---|
| 593 | <tt>key</tt>s have to be <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A>s in |
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| 594 | order to facilitate grouping by the framework.</p> |
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| 595 | |
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| 596 | <p>Data flow:</p> |
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| 597 | <pre> |
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| 598 | (input) |
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| 599 | <tt><k1, v1></tt> |
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| 600 | |
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| 601 | | |
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| 602 | V |
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| 603 | |
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| 604 | <b>map</b> |
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| 605 | |
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| 606 | | |
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| 607 | V |
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| 608 | |
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| 609 | <tt><k2, v2></tt> |
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| 610 | |
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| 611 | | |
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| 612 | V |
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| 613 | |
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| 614 | <b>combine</b> |
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| 615 | |
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| 616 | | |
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| 617 | V |
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| 618 | |
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| 619 | <tt><k2, v2></tt> |
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| 620 | |
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| 621 | | |
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| 622 | V |
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| 623 | |
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| 624 | <b>reduce</b> |
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| 625 | |
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| 626 | | |
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| 627 | V |
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| 628 | |
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| 629 | <tt><k3, v3></tt> |
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| 630 | (output) |
---|
| 631 | </pre> |
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| 632 | |
---|
| 633 | <p>Applications typically implement |
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| 634 | <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html#map(K1, V1, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><CODE>Mapper.map(Object, Object, OutputCollector, Reporter)</CODE></A> |
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| 635 | and |
---|
| 636 | <A HREF="../../../../org/apache/hadoop/mapred/Reducer.html#reduce(K2, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><CODE>Reducer.reduce(Object, Iterator, OutputCollector, Reporter)</CODE></A> |
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| 637 | methods. The application-writer also specifies various facets of the job such |
---|
| 638 | as input and output locations, the <tt>Partitioner</tt>, <tt>InputFormat</tt> |
---|
| 639 | & <tt>OutputFormat</tt> implementations to be used etc. as |
---|
| 640 | a <A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><CODE>JobConf</CODE></A>. The client program, |
---|
| 641 | <A HREF="../../../../org/apache/hadoop/mapred/JobClient.html" title="class in org.apache.hadoop.mapred"><CODE>JobClient</CODE></A>, then submits the job to the framework |
---|
| 642 | and optionally monitors it.</p> |
---|
| 643 | |
---|
| 644 | <p>The framework spawns one map task per |
---|
| 645 | <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A> generated by the |
---|
| 646 | <A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A> of the job and calls |
---|
| 647 | <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html#map(K1, V1, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><CODE>Mapper.map(Object, Object, OutputCollector, Reporter)</CODE></A> |
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| 648 | with each <key, value> pair read by the |
---|
| 649 | <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> from the <tt>InputSplit</tt> for |
---|
| 650 | the task. The intermediate outputs of the maps are then grouped by <tt>key</tt>s |
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| 651 | and optionally aggregated by <i>combiner</i>. The key space of intermediate |
---|
| 652 | outputs are paritioned by the <A HREF="../../../../org/apache/hadoop/mapred/Partitioner.html" title="interface in org.apache.hadoop.mapred"><CODE>Partitioner</CODE></A>, where |
---|
| 653 | the number of partitions is exactly the number of reduce tasks for the job.</p> |
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| 654 | |
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| 655 | <p>The reduce tasks fetch the sorted intermediate outputs of the maps, via http, |
---|
| 656 | merge the <key, value> pairs and call |
---|
| 657 | <A HREF="../../../../org/apache/hadoop/mapred/Reducer.html#reduce(K2, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><CODE>Reducer.reduce(Object, Iterator, OutputCollector, Reporter)</CODE></A> |
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| 658 | for each <key, list of values> pair. The output of the reduce tasks' is |
---|
| 659 | stored on the <tt>FileSystem</tt> by the |
---|
| 660 | <A HREF="../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordWriter</CODE></A> provided by the |
---|
| 661 | <A HREF="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>OutputFormat</CODE></A> of the job.</p> |
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| 662 | |
---|
| 663 | <p>Map-Reduce application to perform a distributed <i>grep</i>:</p> |
---|
| 664 | <pre><tt> |
---|
| 665 | public class Grep extends Configured implements Tool { |
---|
| 666 | |
---|
| 667 | // <i>map: Search for the pattern specified by 'grep.mapper.regex' &</i> |
---|
| 668 | // <i>'grep.mapper.regex.group'</i> |
---|
| 669 | |
---|
| 670 | class GrepMapper<K, Text> |
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| 671 | extends MapReduceBase implements Mapper<K, Text, Text, LongWritable> { |
---|
| 672 | |
---|
| 673 | private Pattern pattern; |
---|
| 674 | private int group; |
---|
| 675 | |
---|
| 676 | public void configure(JobConf job) { |
---|
| 677 | pattern = Pattern.compile(job.get("grep.mapper.regex")); |
---|
| 678 | group = job.getInt("grep.mapper.regex.group", 0); |
---|
| 679 | } |
---|
| 680 | |
---|
| 681 | public void map(K key, Text value, |
---|
| 682 | OutputCollector<Text, LongWritable> output, |
---|
| 683 | Reporter reporter) |
---|
| 684 | throws IOException { |
---|
| 685 | String text = value.toString(); |
---|
| 686 | Matcher matcher = pattern.matcher(text); |
---|
| 687 | while (matcher.find()) { |
---|
| 688 | output.collect(new Text(matcher.group(group)), new LongWritable(1)); |
---|
| 689 | } |
---|
| 690 | } |
---|
| 691 | } |
---|
| 692 | |
---|
| 693 | // <i>reduce: Count the number of occurrences of the pattern</i> |
---|
| 694 | |
---|
| 695 | class GrepReducer<K> extends MapReduceBase |
---|
| 696 | implements Reducer<K, LongWritable, K, LongWritable> { |
---|
| 697 | |
---|
| 698 | public void reduce(K key, Iterator<LongWritable> values, |
---|
| 699 | OutputCollector<K, LongWritable> output, |
---|
| 700 | Reporter reporter) |
---|
| 701 | throws IOException { |
---|
| 702 | |
---|
| 703 | // sum all values for this key |
---|
| 704 | long sum = 0; |
---|
| 705 | while (values.hasNext()) { |
---|
| 706 | sum += values.next().get(); |
---|
| 707 | } |
---|
| 708 | |
---|
| 709 | // output sum |
---|
| 710 | output.collect(key, new LongWritable(sum)); |
---|
| 711 | } |
---|
| 712 | } |
---|
| 713 | |
---|
| 714 | public int run(String[] args) throws Exception { |
---|
| 715 | if (args.length < 3) { |
---|
| 716 | System.out.println("Grep <inDir> <outDir> <regex> [<group>]"); |
---|
| 717 | ToolRunner.printGenericCommandUsage(System.out); |
---|
| 718 | return -1; |
---|
| 719 | } |
---|
| 720 | |
---|
| 721 | JobConf grepJob = new JobConf(getConf(), Grep.class); |
---|
| 722 | |
---|
| 723 | grepJob.setJobName("grep"); |
---|
| 724 | |
---|
| 725 | FileInputFormat.setInputPaths(grepJob, new Path(args[0])); |
---|
| 726 | FileOutputFormat.setOutputPath(grepJob, args[1]); |
---|
| 727 | |
---|
| 728 | grepJob.setMapperClass(GrepMapper.class); |
---|
| 729 | grepJob.setCombinerClass(GrepReducer.class); |
---|
| 730 | grepJob.setReducerClass(GrepReducer.class); |
---|
| 731 | |
---|
| 732 | grepJob.set("mapred.mapper.regex", args[2]); |
---|
| 733 | if (args.length == 4) |
---|
| 734 | grepJob.set("mapred.mapper.regex.group", args[3]); |
---|
| 735 | |
---|
| 736 | grepJob.setOutputFormat(SequenceFileOutputFormat.class); |
---|
| 737 | grepJob.setOutputKeyClass(Text.class); |
---|
| 738 | grepJob.setOutputValueClass(LongWritable.class); |
---|
| 739 | |
---|
| 740 | JobClient.runJob(grepJob); |
---|
| 741 | |
---|
| 742 | return 0; |
---|
| 743 | } |
---|
| 744 | |
---|
| 745 | public static void main(String[] args) throws Exception { |
---|
| 746 | int res = ToolRunner.run(new Configuration(), new Grep(), args); |
---|
| 747 | System.exit(res); |
---|
| 748 | } |
---|
| 749 | |
---|
| 750 | } |
---|
| 751 | </tt></pre> |
---|
| 752 | |
---|
| 753 | <p>Notice how the data-flow of the above grep job is very similar to doing the |
---|
| 754 | same via the unix pipeline:</p> |
---|
| 755 | |
---|
| 756 | <pre> |
---|
| 757 | cat input/* | grep | sort | uniq -c > out |
---|
| 758 | </pre> |
---|
| 759 | |
---|
| 760 | <pre> |
---|
| 761 | input | map | shuffle | reduce > out |
---|
| 762 | </pre> |
---|
| 763 | |
---|
| 764 | <p>Hadoop Map-Reduce applications need not be written in |
---|
| 765 | Java<small><sup>TM</sup></small> only. |
---|
| 766 | <a href="../streaming/package-summary.html">Hadoop Streaming</a> is a utility |
---|
| 767 | which allows users to create and run jobs with any executables (e.g. shell |
---|
| 768 | utilities) as the mapper and/or the reducer. |
---|
| 769 | <a href="pipes/package-summary.html">Hadoop Pipes</a> is a |
---|
| 770 | <a href="http://www.swig.org/">SWIG</a>-compatible <em>C++ API</em> to implement |
---|
| 771 | Map-Reduce applications (non JNI<small><sup>TM</sup></small> based).</p> |
---|
| 772 | |
---|
| 773 | <p>See <a href="http://labs.google.com/papers/mapreduce.html">Google's original |
---|
| 774 | Map/Reduce paper</a> for background information.</p> |
---|
| 775 | |
---|
| 776 | <p><i>Java and JNI are trademarks or registered trademarks of |
---|
| 777 | Sun Microsystems, Inc. in the United States and other countries.</i></p> |
---|
| 778 | <P> |
---|
| 779 | |
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| 780 | <P> |
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| 781 | <DL> |
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| 782 | </DL> |
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