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KeyFieldBasedComparator (Apache Hadoop Main 0.23.1 API)
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org.apache.hadoop.mapreduce.lib.partition</FONT>
<BR>
Class KeyFieldBasedComparator&lt;K,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/io/WritableComparator.html" title="class in org.apache.hadoop.io">org.apache.hadoop.io.WritableComparator</A>
      <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapreduce.lib.partition.KeyFieldBasedComparator&lt;K,V&gt;</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A>, <A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A>, <A HREF="../../../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io">RawComparator</A></DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapred.lib">KeyFieldBasedComparator</A></DD>
</DL>
<HR>
<DL>
<DT><PRE><FONT SIZE="-1">@InterfaceAudience.Public
@InterfaceStability.Stable
</FONT>public class <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html#line.53"><B>KeyFieldBasedComparator&lt;K,V&gt;</B></A><DT>extends <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A><DT>implements <A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></DL>
</PRE>

<P>
This comparator implementation provides a subset of the features provided
 by the Unix/GNU Sort. In particular, the supported features are:
 -n, (Sort numerically)
 -r, (Reverse the result of comparison)
 -k pos1[,pos2], where pos is of the form f[.c][opts], where f is the number
  of the field to use, and c is the number of the first character from the
  beginning of the field. Fields and character posns are numbered starting
  with 1; a character position of zero in pos2 indicates the field's last
  character. If '.c' is omitted from pos1, it defaults to 1 (the beginning
  of the field); if omitted from pos2, it defaults to 0 (the end of the
  field). opts are ordering options (any of 'nr' as described above). 
 We assume that the fields in the key are separated by 
 <CODE>MRJobConfig.MAP_OUTPUT_KEY_FIELD_SEPERATOR</CODE>.
<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/KeyFieldBasedComparator.html#COMPARATOR_OPTIONS">COMPARATOR_OPTIONS</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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<B>Constructor Summary</B></FONT></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html#KeyFieldBasedComparator()">KeyFieldBasedComparator</A></B>()</CODE>

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

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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/KeyFieldBasedComparator.html#compare(byte[], int, int, byte[], int, int)">compare</A></B>(byte[]&nbsp;b1,
               int&nbsp;s1,
               int&nbsp;l1,
               byte[]&nbsp;b2,
               int&nbsp;s2,
               int&nbsp;l2)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Optimization hook.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<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/KeyFieldBasedComparator.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>
<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/KeyFieldBasedComparator.html#getKeyFieldComparatorOption(org.apache.hadoop.mapreduce.JobContext)">getKeyFieldComparatorOption</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;job)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapreduce.lib.partition"><CODE>KeyFieldBasedComparator</CODE></A> options</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/KeyFieldBasedComparator.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/KeyFieldBasedComparator.html#setKeyFieldComparatorOptions(org.apache.hadoop.mapreduce.Job, java.lang.String)">setKeyFieldComparatorOptions</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</A>&nbsp;job,
                                                         <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>&nbsp;keySpec)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapreduce.lib.partition"><CODE>KeyFieldBasedComparator</CODE></A> options used to compare keys.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.io.WritableComparator"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.io.<A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#compare(java.lang.Object, java.lang.Object)">compare</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#compare(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.WritableComparable)">compare</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#compareBytes(byte[], int, int, byte[], int, int)">compareBytes</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#define(java.lang.Class, org.apache.hadoop.io.WritableComparator)">define</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#get(java.lang.Class)">get</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#getKeyClass()">getKeyClass</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#hashBytes(byte[], int)">hashBytes</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#hashBytes(byte[], int, int)">hashBytes</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#newKey()">newKey</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#readDouble(byte[], int)">readDouble</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#readFloat(byte[], int)">readFloat</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#readInt(byte[], int)">readInt</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#readLong(byte[], int)">readLong</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#readUnsignedShort(byte[], int)">readUnsignedShort</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#readVInt(byte[], int)">readVInt</A>, <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#readVLong(byte[], int)">readVLong</A></CODE></TD>
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&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>
</TR>
<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>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.util.Comparator"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from interface java.util.<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.util">equals</A></CODE></TD>
</TR>
</TABLE>
&nbsp;
<P>

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

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<B>Field Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="COMPARATOR_OPTIONS"><!-- --></A><H3>
COMPARATOR_OPTIONS</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/KeyFieldBasedComparator.html#line.56"><B>COMPARATOR_OPTIONS</B></A></PRE>
<DL>
<DL>
</DL>
</DL>

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

<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="KeyFieldBasedComparator()"><!-- --></A><H3>
KeyFieldBasedComparator</H3>
<PRE>
public <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html#line.74"><B>KeyFieldBasedComparator</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/KeyFieldBasedComparator.html#line.62"><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/KeyFieldBasedComparator.html#line.70"><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="compare(byte[], int, int, byte[], int, int)"><!-- --></A><H3>
compare</H3>
<PRE>
public int <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html#line.78"><B>compare</B></A>(byte[]&nbsp;b1,
                   int&nbsp;s1,
                   int&nbsp;l1,
                   byte[]&nbsp;b2,
                   int&nbsp;s2,
                   int&nbsp;l2)</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#compare(byte[], int, int, byte[], int, int)">WritableComparator</A></CODE></B></DD>
<DD>Optimization hook.  Override this to make SequenceFile.Sorter's scream.

 <p>The default implementation reads the data into two <A HREF="../../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A>s (using <A HREF="../../../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)"><CODE>Writable.readFields(DataInput)</CODE></A>, then calls <A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#compare(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.WritableComparable)"><CODE>WritableComparator.compare(WritableComparable,WritableComparable)</CODE></A>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/io/RawComparator.html#compare(byte[], int, int, byte[], int, int)">compare</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io">RawComparator</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html#compare(byte[], int, int, byte[], int, int)">compare</A></CODE> in class <CODE><A HREF="../../../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b1</CODE> - The first byte array.<DD><CODE>s1</CODE> - The position index in b1. The object under comparison's starting index.<DD><CODE>l1</CODE> - The length of the object in b1.<DD><CODE>b2</CODE> - The second byte array.<DD><CODE>s2</CODE> - The position index in b2. The object under comparison's starting index.<DD><CODE>l2</CODE> - The length of the object under comparison in b2.
<DT><B>Returns:</B><DD>An integer result of the comparison.</DL>
</DD>
</DL>
<HR>

<A NAME="setKeyFieldComparatorOptions(org.apache.hadoop.mapreduce.Job, java.lang.String)"><!-- --></A><H3>
setKeyFieldComparatorOptions</H3>
<PRE>
public static void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html#line.363"><B>setKeyFieldComparatorOptions</B></A>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</A>&nbsp;job,
                                                <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>&nbsp;keySpec)</PRE>
<DL>
<DD>Set the <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapreduce.lib.partition"><CODE>KeyFieldBasedComparator</CODE></A> options used to compare keys.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>keySpec</CODE> - the key specification of the form -k pos1[,pos2], where,
  pos is of the form f[.c][opts], where f is the number
  of the key field to use, and c is the number of the first character from
  the beginning of the field. Fields and character posns are numbered 
  starting with 1; a character position of zero in pos2 indicates the
  field's last character. If '.c' is omitted from pos1, it defaults to 1
  (the beginning of the field); if omitted from pos2, it defaults to 0 
  (the end of the field). opts are ordering options. The supported options
  are:
    -n, (Sort numerically)
    -r, (Reverse the result of comparison)</DL>
</DD>
</DL>
<HR>

<A NAME="getKeyFieldComparatorOption(org.apache.hadoop.mapreduce.JobContext)"><!-- --></A><H3>
getKeyFieldComparatorOption</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/KeyFieldBasedComparator.html#line.370"><B>getKeyFieldComparatorOption</B></A>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;job)</PRE>
<DL>
<DD>Get the <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapreduce.lib.partition"><CODE>KeyFieldBasedComparator</CODE></A> options
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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