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BinaryPartitioner (Apache Hadoop Main 2.0.0-alpha API)
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org.apache.hadoop.mapreduce.lib.partition</FONT>
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Class BinaryPartitioner&lt;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;<A HREF="../../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</A>,V&gt;
      <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapreduce.lib.partition.BinaryPartitioner&lt;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/BinaryPartitioner.html" title="class in org.apache.hadoop.mapred.lib">BinaryPartitioner</A></DD>
</DL>
<HR>
<DL>
<DT><PRE><FONT SIZE="-1">@InterfaceAudience.Public
@InterfaceStability.Evolving
</FONT>public class <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#line.71"><B>BinaryPartitioner&lt;V&gt;</B></A><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/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</A>,V&gt;<DT>implements <A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></DL>
</PRE>

<P>
<p>Partition <A HREF="../../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io"><CODE>BinaryComparable</CODE></A> keys using a configurable part of 
 the bytes array returned by <A HREF="../../../../../../org/apache/hadoop/io/BinaryComparable.html#getBytes()"><CODE>BinaryComparable.getBytes()</CODE></A>.</p>
 
 <p>The subarray to be used for the partitioning can be defined by means
 of the following properties:
 <ul>
   <li>
     <i>mapreduce.partition.binarypartitioner.left.offset</i>:
     left offset in array (0 by default)
   </li>
   <li>
     <i>mapreduce.partition.binarypartitioner.right.offset</i>: 
     right offset in array (-1 by default)
   </li>
 </ul>
 Like in Python, both negative and positive offsets are allowed, but
 the meaning is slightly different. In case of an array of length 5,
 for instance, the possible offsets are:
 <pre><code>
  +---+---+---+---+---+
  | B | B | B | B | B |
  +---+---+---+---+---+
    0   1   2   3   4
   -5  -4  -3  -2  -1
 </code></pre>
 The first row of numbers gives the position of the offsets 0...5 in 
 the array; the second row gives the corresponding negative offsets. 
 Contrary to Python, the specified subarray has byte <code>i</code> 
 and <code>j</code> as first and last element, repectively, when 
 <code>i</code> and <code>j</code> are the left and right offset.
 
 <p>For Hadoop programs written in Java, it is advisable to use one of 
 the following static convenience methods for setting the offsets:
 <ul>
   <li><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#setOffsets(org.apache.hadoop.conf.Configuration, int, int)"><CODE>setOffsets(org.apache.hadoop.conf.Configuration, int, int)</CODE></A></li>
   <li><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#setLeftOffset(org.apache.hadoop.conf.Configuration, int)"><CODE>setLeftOffset(org.apache.hadoop.conf.Configuration, int)</CODE></A></li>
   <li><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#setRightOffset(org.apache.hadoop.conf.Configuration, int)"><CODE>setRightOffset(org.apache.hadoop.conf.Configuration, int)</CODE></A></li>
 </ul></p>
<P>

<P>
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<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#LEFT_OFFSET_PROPERTY_NAME">LEFT_OFFSET_PROPERTY_NAME</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/BinaryPartitioner.html#RIGHT_OFFSET_PROPERTY_NAME">RIGHT_OFFSET_PROPERTY_NAME</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#BinaryPartitioner()">BinaryPartitioner</A></B>()</CODE>

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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<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/BinaryPartitioner.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>
</TR>
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<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/BinaryPartitioner.html#getPartition(org.apache.hadoop.io.BinaryComparable, V, int)">getPartition</A></B>(<A HREF="../../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</A>&nbsp;key,
                         <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html" title="type parameter in BinaryPartitioner">V</A>&nbsp;value,
                         int&nbsp;numPartitions)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Use (the specified slice of the array returned by) 
 <A HREF="../../../../../../org/apache/hadoop/io/BinaryComparable.html#getBytes()"><CODE>BinaryComparable.getBytes()</CODE></A> to partition.</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/BinaryPartitioner.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;Set the configuration to be used by this object.</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/BinaryPartitioner.html#setLeftOffset(org.apache.hadoop.conf.Configuration, int)">setLeftOffset</A></B>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
                           int&nbsp;offset)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the subarray to be used for partitioning to 
 <code>bytes[offset:]</code> in Python syntax.</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/BinaryPartitioner.html#setOffsets(org.apache.hadoop.conf.Configuration, int, int)">setOffsets</A></B>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
                     int&nbsp;left,
                     int&nbsp;right)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the subarray to be used for partitioning to 
 <code>bytes[left:(right+1)]</code> in Python syntax.</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/BinaryPartitioner.html#setRightOffset(org.apache.hadoop.conf.Configuration, int)">setRightOffset</A></B>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
                             int&nbsp;offset)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the subarray to be used for partitioning to 
 <code>bytes[:(offset+1)]</code> in Python syntax.</TD>
</TR>
</TABLE>
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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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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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&nbsp;
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<B>Field Detail</B></FONT></TH>
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<A NAME="LEFT_OFFSET_PROPERTY_NAME"><!-- --></A><H3>
LEFT_OFFSET_PROPERTY_NAME</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/BinaryPartitioner.html#line.74"><B>LEFT_OFFSET_PROPERTY_NAME</B></A></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.partition.BinaryPartitioner.LEFT_OFFSET_PROPERTY_NAME">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="RIGHT_OFFSET_PROPERTY_NAME"><!-- --></A><H3>
RIGHT_OFFSET_PROPERTY_NAME</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/BinaryPartitioner.html#line.76"><B>RIGHT_OFFSET_PROPERTY_NAME</B></A></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.partition.BinaryPartitioner.RIGHT_OFFSET_PROPERTY_NAME">Constant Field Values</A></DL>
</DL>

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

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<A NAME="BinaryPartitioner()"><!-- --></A><H3>
BinaryPartitioner</H3>
<PRE>
public <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#line.71"><B>BinaryPartitioner</B></A>()</PRE>
<DL>
</DL>

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<B>Method Detail</B></FONT></TH>
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<A NAME="setOffsets(org.apache.hadoop.conf.Configuration, int, int)"><!-- --></A><H3>
setOffsets</H3>
<PRE>
public static void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#line.87"><B>setOffsets</B></A>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
                              int&nbsp;left,
                              int&nbsp;right)</PRE>
<DL>
<DD>Set the subarray to be used for partitioning to 
 <code>bytes[left:(right+1)]</code> in Python syntax.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>conf</CODE> - configuration object<DD><CODE>left</CODE> - left Python-style offset<DD><CODE>right</CODE> - right Python-style offset</DL>
</DD>
</DL>
<HR>

<A NAME="setLeftOffset(org.apache.hadoop.conf.Configuration, int)"><!-- --></A><H3>
setLeftOffset</H3>
<PRE>
public static void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#line.99"><B>setLeftOffset</B></A>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
                                 int&nbsp;offset)</PRE>
<DL>
<DD>Set the subarray to be used for partitioning to 
 <code>bytes[offset:]</code> in Python syntax.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>conf</CODE> - configuration object<DD><CODE>offset</CODE> - left Python-style offset</DL>
</DD>
</DL>
<HR>

<A NAME="setRightOffset(org.apache.hadoop.conf.Configuration, int)"><!-- --></A><H3>
setRightOffset</H3>
<PRE>
public static void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#line.110"><B>setRightOffset</B></A>(<A HREF="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
                                  int&nbsp;offset)</PRE>
<DL>
<DD>Set the subarray to be used for partitioning to 
 <code>bytes[:(offset+1)]</code> in Python syntax.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>conf</CODE> - configuration object<DD><CODE>offset</CODE> - right Python-style offset</DL>
</DD>
</DL>
<HR>

<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/BinaryPartitioner.html#line.118"><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><B>Description copied from interface: <CODE><A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html#setConf(org.apache.hadoop.conf.Configuration)">Configurable</A></CODE></B></DD>
<DD>Set the configuration to be used by this object.
<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/BinaryPartitioner.html#line.124"><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.BinaryComparable,java.lang.Object,int)"><!-- --></A><A NAME="getPartition(org.apache.hadoop.io.BinaryComparable, V, int)"><!-- --></A><H3>
getPartition</H3>
<PRE>
public int <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#line.133"><B>getPartition</B></A>(<A HREF="../../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</A>&nbsp;key,
                        <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html" title="type parameter in BinaryPartitioner">V</A>&nbsp;value,
                        int&nbsp;numPartitions)</PRE>
<DL>
<DD>Use (the specified slice of the array returned by) 
 <A HREF="../../../../../../org/apache/hadoop/io/BinaryComparable.html#getBytes()"><CODE>BinaryComparable.getBytes()</CODE></A> to partition.
<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/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</A>,<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html" title="type parameter in BinaryPartitioner">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>
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