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7HashPartitioner (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapreduce.lib.partition</FONT>
92<BR>
93Class HashPartitioner&lt;K,V&gt;</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;K,V&gt;
97      <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapreduce.lib.partition.HashPartitioner&lt;K,V&gt;</B>
98</PRE>
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100<DL>
101<DT><PRE>public class <B>HashPartitioner&lt;K,V&gt;</B><DT>extends <A HREF="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce">Partitioner</A>&lt;K,V&gt;</DL>
102</PRE>
103
104<P>
105Partition keys by their <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang"><CODE>Object.hashCode()</CODE></A>.
106<P>
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112
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119<B>Constructor Summary</B></FONT></TH>
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122<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/HashPartitioner.html#HashPartitioner()">HashPartitioner</A></B>()</CODE>
123
124<BR>
125&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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139<CODE>&nbsp;int</CODE></FONT></TD>
140<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/HashPartitioner.html#getPartition(K, V, int)">getPartition</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/HashPartitioner.html" title="type parameter in HashPartitioner">K</A>&nbsp;key,
141             <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/HashPartitioner.html" title="type parameter in HashPartitioner">V</A>&nbsp;value,
142             int&nbsp;numReduceTasks)</CODE>
143
144<BR>
145&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Use <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang"><CODE>Object.hashCode()</CODE></A> to partition.</TD>
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166<B>Constructor Detail</B></FONT></TH>
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169
170<A NAME="HashPartitioner()"><!-- --></A><H3>
171HashPartitioner</H3>
172<PRE>
173public <B>HashPartitioner</B>()</PRE>
174<DL>
175</DL>
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186
187<A NAME="getPartition(java.lang.Object,java.lang.Object,int)"><!-- --></A><A NAME="getPartition(K, V, int)"><!-- --></A><H3>
188getPartition</H3>
189<PRE>
190public int <B>getPartition</B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/HashPartitioner.html" title="type parameter in HashPartitioner">K</A>&nbsp;key,
191                        <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/HashPartitioner.html" title="type parameter in HashPartitioner">V</A>&nbsp;value,
192                        int&nbsp;numReduceTasks)</PRE>
193<DL>
194<DD>Use <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang"><CODE>Object.hashCode()</CODE></A> to partition.
195<P>
196<DD><DL>
197<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/mapreduce/lib/partition/HashPartitioner.html" title="type parameter in HashPartitioner">K</A>,<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/HashPartitioner.html" title="type parameter in HashPartitioner">V</A>&gt;</CODE></DL>
198</DD>
199<DD><DL>
200<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key to be partioned.<DD><CODE>value</CODE> - the entry value.<DD><CODE>numReduceTasks</CODE> - the total number of partitions.
201<DT><B>Returns:</B><DD>the partition number for the <code>key</code>.</DL>
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