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91org.apache.hadoop.mapred.lib</FONT>
92<BR>
93Class KeyFieldBasedPartitioner&lt;K2,V2&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 "><B>org.apache.hadoop.mapred.lib.KeyFieldBasedPartitioner&lt;K2,V2&gt;</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</A>, <A HREF="../../../../../org/apache/hadoop/mapred/Partitioner.html" title="interface in org.apache.hadoop.mapred">Partitioner</A>&lt;K2,V2&gt;</DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>KeyFieldBasedPartitioner&lt;K2,V2&gt;</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><DT>implements <A HREF="../../../../../org/apache/hadoop/mapred/Partitioner.html" title="interface in org.apache.hadoop.mapred">Partitioner</A>&lt;K2,V2&gt;</DL>
104</PRE>
105
106<P>
107Defines a way to partition keys based on certain key fields (also see
108  <A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapred.lib"><CODE>KeyFieldBasedComparator</CODE></A>.
109  The key specification supported is of the form -k pos1[,pos2], where,
110  pos is of the form f[.c][opts], where f is the number
111  of the key field to use, and c is the number of the first character from
112  the beginning of the field. Fields and character posns are numbered
113  starting with 1; a character position of zero in pos2 indicates the
114  field's last character. If '.c' is omitted from pos1, it defaults to 1
115  (the beginning of the field); if omitted from pos2, it defaults to 0
116  (the end of the field).
117<P>
118
119<P>
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121
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123
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130<B>Constructor Summary</B></FONT></TH>
131</TR>
132<TR BGCOLOR="white" CLASS="TableRowColor">
133<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html#KeyFieldBasedPartitioner()">KeyFieldBasedPartitioner</A></B>()</CODE>
134
135<BR>
136&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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150<CODE>&nbsp;void</CODE></FONT></TD>
151<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</CODE>
152
153<BR>
154&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initializes a new instance from a <A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><CODE>JobConf</CODE></A>.</TD>
155</TR>
156<TR BGCOLOR="white" CLASS="TableRowColor">
157<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
158<CODE>protected &nbsp;int</CODE></FONT></TD>
159<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html#getPartition(int, int)">getPartition</A></B>(int&nbsp;hash,
160             int&nbsp;numReduceTasks)</CODE>
161
162<BR>
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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165<TR BGCOLOR="white" CLASS="TableRowColor">
166<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
167<CODE>&nbsp;int</CODE></FONT></TD>
168<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html#getPartition(K2, V2, int)">getPartition</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">K2</A>&nbsp;key,
169             <A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">V2</A>&nbsp;value,
170             int&nbsp;numReduceTasks)</CODE>
171
172<BR>
173&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the paritition number for a given key (hence record) given the total
174 number of partitions i.e.</TD>
175</TR>
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177<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
178<CODE>protected &nbsp;int</CODE></FONT></TD>
179<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html#hashCode(byte[], int, int, int)">hashCode</A></B>(byte[]&nbsp;b,
180         int&nbsp;start,
181         int&nbsp;end,
182         int&nbsp;currentHash)</CODE>
183
184<BR>
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208</TABLE>
209
210<A NAME="KeyFieldBasedPartitioner()"><!-- --></A><H3>
211KeyFieldBasedPartitioner</H3>
212<PRE>
213public <B>KeyFieldBasedPartitioner</B>()</PRE>
214<DL>
215</DL>
216
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226
227<A NAME="configure(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
228configure</H3>
229<PRE>
230public void <B>configure</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
231<DL>
232<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/mapred/JobConfigurable.html#configure(org.apache.hadoop.mapred.JobConf)">JobConfigurable</A></CODE></B></DD>
233<DD>Initializes a new instance from a <A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><CODE>JobConf</CODE></A>.
234<P>
235<DD><DL>
236<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/JobConfigurable.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</A></CODE></DL>
237</DD>
238<DD><DL>
239<DT><B>Parameters:</B><DD><CODE>job</CODE> - the configuration</DL>
240</DD>
241</DL>
242<HR>
243
244<A NAME="getPartition(java.lang.Object,java.lang.Object,int)"><!-- --></A><A NAME="getPartition(K2, V2, int)"><!-- --></A><H3>
245getPartition</H3>
246<PRE>
247public int <B>getPartition</B>(<A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">K2</A>&nbsp;key,
248                        <A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">V2</A>&nbsp;value,
249                        int&nbsp;numReduceTasks)</PRE>
250<DL>
251<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/mapred/Partitioner.html#getPartition(K2, V2, int)">Partitioner</A></CODE></B></DD>
252<DD>Get the paritition number for a given key (hence record) given the total
253 number of partitions i.e. number of reduce-tasks for the job.
254   
255 <p>Typically a hash function on a all or a subset of the key.</p>
256<P>
257<DD><DL>
258<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/Partitioner.html#getPartition(K2, V2, int)">getPartition</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/mapred/Partitioner.html" title="interface in org.apache.hadoop.mapred">Partitioner</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">K2</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">V2</A>&gt;</CODE></DL>
259</DD>
260<DD><DL>
261<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key to be paritioned.<DD><CODE>value</CODE> - the entry value.<DD><CODE>numReduceTasks</CODE> - the total number of partitions.
262<DT><B>Returns:</B><DD>the partition number for the <code>key</code>.</DL>
263</DD>
264</DL>
265<HR>
266
267<A NAME="hashCode(byte[], int, int, int)"><!-- --></A><H3>
268hashCode</H3>
269<PRE>
270protected int <B>hashCode</B>(byte[]&nbsp;b,
271                       int&nbsp;start,
272                       int&nbsp;end,
273                       int&nbsp;currentHash)</PRE>
274<DL>
275<DD><DL>
276</DL>
277</DD>
278<DD><DL>
279</DL>
280</DD>
281</DL>
282<HR>
283
284<A NAME="getPartition(int, int)"><!-- --></A><H3>
285getPartition</H3>
286<PRE>
287protected int <B>getPartition</B>(int&nbsp;hash,
288                           int&nbsp;numReduceTasks)</PRE>
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