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93Class SecondarySort.FirstPartitioner</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 "><A HREF="../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce">org.apache.hadoop.mapreduce.Partitioner</A>&lt;<A HREF="../../../../org/apache/hadoop/examples/SecondarySort.IntPair.html" title="class in org.apache.hadoop.examples">SecondarySort.IntPair</A>,<A HREF="../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&gt;
97      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.examples.SecondarySort.FirstPartitioner</B>
98</PRE>
99<DL>
100<DT><B>Enclosing class:</B><DD><A HREF="../../../../org/apache/hadoop/examples/SecondarySort.html" title="class in org.apache.hadoop.examples">SecondarySort</A></DD>
101</DL>
102<HR>
103<DL>
104<DT><PRE>public static class <B>SecondarySort.FirstPartitioner</B><DT>extends <A HREF="../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce">Partitioner</A>&lt;<A HREF="../../../../org/apache/hadoop/examples/SecondarySort.IntPair.html" title="class in org.apache.hadoop.examples">SecondarySort.IntPair</A>,<A HREF="../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&gt;</DL>
105</PRE>
106
107<P>
108Partition based on the first part of the pair.
109<P>
110
111<P>
112<HR>
113
114<P>
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125<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/SecondarySort.FirstPartitioner.html#SecondarySort.FirstPartitioner()">SecondarySort.FirstPartitioner</A></B>()</CODE>
126
127<BR>
128&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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142<CODE>&nbsp;int</CODE></FONT></TD>
143<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/SecondarySort.FirstPartitioner.html#getPartition(org.apache.hadoop.examples.SecondarySort.IntPair, org.apache.hadoop.io.IntWritable, int)">getPartition</A></B>(<A HREF="../../../../org/apache/hadoop/examples/SecondarySort.IntPair.html" title="class in org.apache.hadoop.examples">SecondarySort.IntPair</A>&nbsp;key,
144             <A HREF="../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&nbsp;value,
145             int&nbsp;numPartitions)</CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the partition number for a given key (hence record) given the total
149 number of partitions i.e.</TD>
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174<A NAME="SecondarySort.FirstPartitioner()"><!-- --></A><H3>
175SecondarySort.FirstPartitioner</H3>
176<PRE>
177public <B>SecondarySort.FirstPartitioner</B>()</PRE>
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190
191<A NAME="getPartition(org.apache.hadoop.examples.SecondarySort.IntPair, org.apache.hadoop.io.IntWritable, int)"><!-- --></A><H3>
192getPartition</H3>
193<PRE>
194public int <B>getPartition</B>(<A HREF="../../../../org/apache/hadoop/examples/SecondarySort.IntPair.html" title="class in org.apache.hadoop.examples">SecondarySort.IntPair</A>&nbsp;key,
195                        <A HREF="../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&nbsp;value,
196                        int&nbsp;numPartitions)</PRE>
197<DL>
198<DD><B>Description copied from class: <CODE><A HREF="../../../../org/apache/hadoop/mapreduce/Partitioner.html#getPartition(KEY, VALUE, int)">Partitioner</A></CODE></B></DD>
199<DD>Get the partition number for a given key (hence record) given the total
200 number of partitions i.e. number of reduce-tasks for the job.
201   
202 <p>Typically a hash function on a all or a subset of the key.</p>
203<P>
204<DD><DL>
205<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/mapreduce/Partitioner.html#getPartition(KEY, VALUE, int)">getPartition</A></CODE> in class <CODE><A HREF="../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce">Partitioner</A>&lt;<A HREF="../../../../org/apache/hadoop/examples/SecondarySort.IntPair.html" title="class in org.apache.hadoop.examples">SecondarySort.IntPair</A>,<A HREF="../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&gt;</CODE></DL>
206</DD>
207<DD><DL>
208<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key to be partioned.<DD><CODE>value</CODE> - the entry value.<DD><CODE>numPartitions</CODE> - the total number of partitions.
209<DT><B>Returns:</B><DD>the partition number for the <code>key</code>.</DL>
210</DD>
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