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TotalOrderPartitioner (Apache Hadoop Main 2.0.0-alpha API)
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org.apache.hadoop.mapreduce.lib.partition</FONT>
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Class TotalOrderPartitioner&lt;K extends <A HREF="../../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&lt;?&gt;,V&gt;</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
  <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;
      <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapreduce.lib.partition.TotalOrderPartitioner&lt;K,V&gt;</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="class in org.apache.hadoop.mapred.lib">TotalOrderPartitioner</A></DD>
</DL>
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<DT><PRE><FONT SIZE="-1">@InterfaceAudience.Public
@InterfaceStability.Stable
</FONT>public class <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.50"><B>TotalOrderPartitioner&lt;K extends <A HREF="../../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&lt;?&gt;,V&gt;</B></A><DT>extends <A HREF="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce">Partitioner</A>&lt;K,V&gt;<DT>implements <A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></DL>
</PRE>

<P>
Partitioner effecting a total order by reading split points from
 an externally generated source.
<P>

<P>
<HR>

<P>
<!-- =========== FIELD SUMMARY =========== -->

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<CODE>static&nbsp;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#DEFAULT_PATH">DEFAULT_PATH</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<CODE>static&nbsp;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#MAX_TRIE_DEPTH">MAX_TRIE_DEPTH</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<CODE>static&nbsp;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#NATURAL_ORDER">NATURAL_ORDER</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#PARTITIONER_PATH">PARTITIONER_PATH</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->

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<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#TotalOrderPartitioner()">TotalOrderPartitioner</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<CODE>&nbsp;<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#getConf()">getConf</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the configuration used by this object.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#getPartition(K, V, int)">getPartition</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">K</A>&nbsp;key,
                         <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">V</A>&nbsp;value,
                         int&nbsp;numPartitions)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the partition number for a given key (hence record) given the total 
 number of partitions i.e.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#getPartitionFile(org.apache.hadoop.conf.Configuration)">getPartitionFile</A></B>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the path to the SequenceFile storing the sorted partition keyset.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></B>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read in the partition file and build indexing data structures.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#setPartitionFile(org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path)">setPartitionFile</A></B>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
                                 <A HREF="../../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;p)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the path to the SequenceFile storing the sorted partition keyset.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
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<P>

<!-- ============ FIELD DETAIL =========== -->

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<B>Field Detail</B></FONT></TH>
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<A NAME="DEFAULT_PATH"><!-- --></A><H3>
DEFAULT_PATH</H3>
<PRE>
public static final <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.54"><B>DEFAULT_PATH</B></A></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.partition.TotalOrderPartitioner.DEFAULT_PATH">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="PARTITIONER_PATH"><!-- --></A><H3>
PARTITIONER_PATH</H3>
<PRE>
public static final <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.55"><B>PARTITIONER_PATH</B></A></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.partition.TotalOrderPartitioner.PARTITIONER_PATH">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="MAX_TRIE_DEPTH"><!-- --></A><H3>
MAX_TRIE_DEPTH</H3>
<PRE>
public static final <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.57"><B>MAX_TRIE_DEPTH</B></A></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.partition.TotalOrderPartitioner.MAX_TRIE_DEPTH">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="NATURAL_ORDER"><!-- --></A><H3>
NATURAL_ORDER</H3>
<PRE>
public static final <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.59"><B>NATURAL_ORDER</B></A></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.partition.TotalOrderPartitioner.NATURAL_ORDER">Constant Field Values</A></DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Constructor Detail</B></FONT></TH>
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<A NAME="TotalOrderPartitioner()"><!-- --></A><H3>
TotalOrderPartitioner</H3>
<PRE>
public <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.64"><B>TotalOrderPartitioner</B></A>()</PRE>
<DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<B>Method Detail</B></FONT></TH>
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<A NAME="setConf(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
setConf</H3>
<PRE>
public void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.77"><B>setConf</B></A>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
<DL>
<DD>Read in the partition file and build indexing data structures.
 If the keytype is <A HREF="../../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io"><CODE>BinaryComparable</CODE></A> and
 <tt>total.order.partitioner.natural.order</tt> is not false, a trie
 of the first <tt>total.order.partitioner.max.trie.depth</tt>(2) + 1 bytes
 will be built. Otherwise, keys will be located using a binary search of
 the partition keyset using the <A HREF="../../../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io"><CODE>RawComparator</CODE></A>
 defined for this job. The input file must be sorted with the same
 comparator and contain <CODE>JobContextImpl.getNumReduceTasks()</CODE> - 1 keys.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getConf()"><!-- --></A><H3>
getConf</H3>
<PRE>
public <A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.120"><B>getConf</B></A>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html#getConf()">Configurable</A></CODE></B></DD>
<DD>Return the configuration used by this object.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html#getConf()">getConf</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getPartition(org.apache.hadoop.io.WritableComparable,java.lang.Object,int)"><!-- --></A><A NAME="getPartition(K, V, int)"><!-- --></A><H3>
getPartition</H3>
<PRE>
public int <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.126"><B>getPartition</B></A>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">K</A>&nbsp;key,
                        <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">V</A>&nbsp;value,
                        int&nbsp;numPartitions)</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html#getPartition(KEY, VALUE, int)">Partitioner</A></CODE></B></DD>
<DD>Get the partition number for a given key (hence record) given the total 
 number of partitions i.e. number of reduce-tasks for the job.
   
 <p>Typically a hash function on a all or a subset of the key.</p>
<P>
<DD><DL>
<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/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>&lt;?&gt;,<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html" title="type parameter in TotalOrderPartitioner">V</A>&gt;</CODE></DL>
</DD>
<DD><DL>
<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.
<DT><B>Returns:</B><DD>the partition number for the <code>key</code>.</DL>
</DD>
</DL>
<HR>

<A NAME="setPartitionFile(org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path)"><!-- --></A><H3>
setPartitionFile</H3>
<PRE>
public static void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.135"><B>setPartitionFile</B></A>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
                                    <A HREF="../../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;p)</PRE>
<DL>
<DD>Set the path to the SequenceFile storing the sorted partition keyset.
 It must be the case that for <tt>R</tt> reduces, there are <tt>R-1</tt>
 keys in the SequenceFile.
<P>
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<A NAME="getPartitionFile(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
getPartitionFile</H3>
<PRE>
public static <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#line.143"><B>getPartitionFile</B></A>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
<DL>
<DD>Get the path to the SequenceFile storing the sorted partition keyset.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/TotalOrderPartitioner.html#setPartitionFile(org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path)"><CODE>setPartitionFile(Configuration, Path)</CODE></A></DL>
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