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91org.apache.hadoop.mapred.lib</FONT>
92<BR>
93Class TotalOrderPartitioner&lt;K extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,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 "><B>org.apache.hadoop.mapred.lib.TotalOrderPartitioner&lt;K,V&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;K,V&gt;</DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>TotalOrderPartitioner&lt;K extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,V&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;K,V&gt;</DL>
104</PRE>
105
106<P>
107Partitioner effecting a total order by reading split points from
108 an externally generated source.
109<P>
110
111<P>
112<HR>
113
114<P>
115<!-- =========== FIELD SUMMARY =========== -->
116
117<A NAME="field_summary"><!-- --></A>
118<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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120<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
121<B>Field Summary</B></FONT></TH>
122</TR>
123<TR BGCOLOR="white" CLASS="TableRowColor">
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125<CODE>static&nbsp;<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></CODE></FONT></TD>
126<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html#DEFAULT_PATH">DEFAULT_PATH</A></B></CODE>
127
128<BR>
129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
130</TR>
131</TABLE>
132&nbsp;
133<!-- ======== CONSTRUCTOR SUMMARY ======== -->
134
135<A NAME="constructor_summary"><!-- --></A>
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139<B>Constructor Summary</B></FONT></TH>
140</TR>
141<TR BGCOLOR="white" CLASS="TableRowColor">
142<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html#TotalOrderPartitioner()">TotalOrderPartitioner</A></B>()</CODE>
143
144<BR>
145&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
146</TR>
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149<!-- ========== METHOD SUMMARY =========== -->
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159<CODE>&nbsp;void</CODE></FONT></TD>
160<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.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>
161
162<BR>
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read in the partition file and build indexing data structures.</TD>
164</TR>
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/TotalOrderPartitioner.html#getPartition(K, V, int)">getPartition</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">K</A>&nbsp;key,
169             <A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">V</A>&nbsp;value,
170             int&nbsp;numPartitions)</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>
176<TR BGCOLOR="white" CLASS="TableRowColor">
177<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
178<CODE>static&nbsp;<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></CODE></FONT></TD>
179<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html#getPartitionFile(org.apache.hadoop.mapred.JobConf)">getPartitionFile</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</CODE>
180
181<BR>
182&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the path to the SequenceFile storing the sorted partition keyset.</TD>
183</TR>
184<TR BGCOLOR="white" CLASS="TableRowColor">
185<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
186<CODE>static&nbsp;void</CODE></FONT></TD>
187<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html#setPartitionFile(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.fs.Path)">setPartitionFile</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
188                 <A HREF="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;p)</CODE>
189
190<BR>
191&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the path to the SequenceFile storing the sorted partition keyset.</TD>
192</TR>
193</TABLE>
194&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
195<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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212<B>Field Detail</B></FONT></TH>
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214</TABLE>
215
216<A NAME="DEFAULT_PATH"><!-- --></A><H3>
217DEFAULT_PATH</H3>
218<PRE>
219public static final <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> <B>DEFAULT_PATH</B></PRE>
220<DL>
221<DL>
222<DT><B>See Also:</B><DD><A HREF="../../../../../constant-values.html#org.apache.hadoop.mapred.lib.TotalOrderPartitioner.DEFAULT_PATH">Constant Field Values</A></DL>
223</DL>
224
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230<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
231<B>Constructor Detail</B></FONT></TH>
232</TR>
233</TABLE>
234
235<A NAME="TotalOrderPartitioner()"><!-- --></A><H3>
236TotalOrderPartitioner</H3>
237<PRE>
238public <B>TotalOrderPartitioner</B>()</PRE>
239<DL>
240</DL>
241
242<!-- ============ METHOD DETAIL ========== -->
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248<B>Method Detail</B></FONT></TH>
249</TR>
250</TABLE>
251
252<A NAME="configure(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
253configure</H3>
254<PRE>
255public void <B>configure</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
256<DL>
257<DD>Read in the partition file and build indexing data structures.
258 If the keytype is <A HREF="../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io"><CODE>BinaryComparable</CODE></A> and
259 <tt>total.order.partitioner.natural.order</tt> is not false, a trie
260 of the first <tt>total.order.partitioner.max.trie.depth</tt>(2) + 1 bytes
261 will be built. Otherwise, keys will be located using a binary search of
262 the partition keyset using the <A HREF="../../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io"><CODE>RawComparator</CODE></A>
263 defined for this job. The input file must be sorted with the same
264 comparator and contain <A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html#getNumReduceTasks()"><CODE>JobConf.getNumReduceTasks()</CODE></A> - 1 keys.
265<P>
266<DD><DL>
267<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>
268</DD>
269<DD><DL>
270<DT><B>Parameters:</B><DD><CODE>job</CODE> - the configuration</DL>
271</DD>
272</DL>
273<HR>
274
275<A NAME="getPartition(org.apache.hadoop.io.WritableComparable,java.lang.Object,int)"><!-- --></A><A NAME="getPartition(K, V, int)"><!-- --></A><H3>
276getPartition</H3>
277<PRE>
278public int <B>getPartition</B>(<A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">K</A>&nbsp;key,
279                        <A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">V</A>&nbsp;value,
280                        int&nbsp;numPartitions)</PRE>
281<DL>
282<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/mapred/Partitioner.html#getPartition(K2, V2, int)">Partitioner</A></CODE></B></DD>
283<DD>Get the paritition number for a given key (hence record) given the total
284 number of partitions i.e. number of reduce-tasks for the job.
285   
286 <p>Typically a hash function on a all or a subset of the key.</p>
287<P>
288<DD><DL>
289<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/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">K</A> extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">V</A>&gt;</CODE></DL>
290</DD>
291<DD><DL>
292<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key to be paritioned.<DD><CODE>value</CODE> - the entry value.<DD><CODE>numPartitions</CODE> - the total number of partitions.
293<DT><B>Returns:</B><DD>the partition number for the <code>key</code>.</DL>
294</DD>
295</DL>
296<HR>
297
298<A NAME="setPartitionFile(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.fs.Path)"><!-- --></A><H3>
299setPartitionFile</H3>
300<PRE>
301public static void <B>setPartitionFile</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
302                                    <A HREF="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;p)</PRE>
303<DL>
304<DD>Set the path to the SequenceFile storing the sorted partition keyset.
305 It must be the case that for <tt>R</tt> reduces, there are <tt>R-1</tt>
306 keys in the SequenceFile.
307<P>
308<DD><DL>
309</DL>
310</DD>
311<DD><DL>
312</DL>
313</DD>
314</DL>
315<HR>
316
317<A NAME="getPartitionFile(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
318getPartitionFile</H3>
319<PRE>
320public static <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> <B>getPartitionFile</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
321<DL>
322<DD>Get the path to the SequenceFile storing the sorted partition keyset.
323<P>
324<DD><DL>
325</DL>
326</DD>
327<DD><DL>
328<DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html#setPartitionFile(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.fs.Path)"><CODE>setPartitionFile(JobConf,Path)</CODE></A></DL>
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