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7SecondarySort (Hadoop 0.20.1 API)
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91org.apache.hadoop.examples</FONT>
92<BR>
93Class SecondarySort</H2>
94<PRE>
95<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
96  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.examples.SecondarySort</B>
97</PRE>
98<HR>
99<DL>
100<DT><PRE>public class <B>SecondarySort</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
101</PRE>
102
103<P>
104This is an example Hadoop Map/Reduce application.
105 It reads the text input files that must contain two integers per a line.
106 The output is sorted by the first and second number and grouped on the
107 first number.
108
109 To run: bin/hadoop jar build/hadoop-examples.jar secondarysort
110            <i>in-dir</i> <i>out-dir</i>
111<P>
112
113<P>
114<HR>
115
116<P>
117<!-- ======== NESTED CLASS SUMMARY ======== -->
118
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123<B>Nested Class Summary</B></FONT></TH>
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125<TR BGCOLOR="white" CLASS="TableRowColor">
126<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
127<CODE>static&nbsp;class</CODE></FONT></TD>
128<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/SecondarySort.FirstGroupingComparator.html" title="class in org.apache.hadoop.examples">SecondarySort.FirstGroupingComparator</A></B></CODE>
129
130<BR>
131&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compare only the first part of the pair, so that reduce is called once
132 for each value of the first part.</TD>
133</TR>
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136<CODE>static&nbsp;class</CODE></FONT></TD>
137<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/SecondarySort.FirstPartitioner.html" title="class in org.apache.hadoop.examples">SecondarySort.FirstPartitioner</A></B></CODE>
138
139<BR>
140&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Partition based on the first part of the pair.</TD>
141</TR>
142<TR BGCOLOR="white" CLASS="TableRowColor">
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144<CODE>static&nbsp;class</CODE></FONT></TD>
145<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/SecondarySort.IntPair.html" title="class in org.apache.hadoop.examples">SecondarySort.IntPair</A></B></CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Define a pair of integers that are writable.</TD>
149</TR>
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152<CODE>static&nbsp;class</CODE></FONT></TD>
153<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/SecondarySort.MapClass.html" title="class in org.apache.hadoop.examples">SecondarySort.MapClass</A></B></CODE>
154
155<BR>
156&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read two integers from each line and generate a key, value pair
157 as ((left, right), right).</TD>
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161<CODE>static&nbsp;class</CODE></FONT></TD>
162<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/SecondarySort.Reduce.html" title="class in org.apache.hadoop.examples">SecondarySort.Reduce</A></B></CODE>
163
164<BR>
165&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A reducer class that just emits the sum of the input values.</TD>
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178<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/SecondarySort.html#SecondarySort()">SecondarySort</A></B>()</CODE>
179
180<BR>
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195<CODE>static&nbsp;void</CODE></FONT></TD>
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209</TR>
210</TABLE>
211&nbsp;
212<P>
213
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219<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
220<B>Constructor Detail</B></FONT></TH>
221</TR>
222</TABLE>
223
224<A NAME="SecondarySort()"><!-- --></A><H3>
225SecondarySort</H3>
226<PRE>
227public <B>SecondarySort</B>()</PRE>
228<DL>
229</DL>
230
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236<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
237<B>Method Detail</B></FONT></TH>
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239</TABLE>
240
241<A NAME="main(java.lang.String[])"><!-- --></A><H3>
242main</H3>
243<PRE>
244public static void <B>main</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args)
245                 throws <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></PRE>
246<DL>
247<DD><DL>
248
249<DT><B>Throws:</B>
250<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></CODE></DL>
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