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91org.apache.hadoop.mapred.lib</FONT>
92<BR>
93Class KeyFieldBasedComparator&lt;K,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 "><A HREF="../../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">org.apache.hadoop.io.WritableComparator</A>
97      <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapred.lib.KeyFieldBasedComparator&lt;K,V&gt;</B>
98</PRE>
99<DL>
100<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.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/io/RawComparator.html" title="interface in org.apache.hadoop.io">RawComparator</A>, <A HREF="../../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</A></DD>
101</DL>
102<HR>
103<DL>
104<DT><PRE>public class <B>KeyFieldBasedComparator&lt;K,V&gt;</B><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/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</A></DL>
105</PRE>
106
107<P>
108This comparator implementation provides a subset of the features provided
109 by the Unix/GNU Sort. In particular, the supported features are:
110 -n, (Sort numerically)
111 -r, (Reverse the result of comparison)
112 -k pos1[,pos2], where pos is of the form f[.c][opts], where f is the number
113  of the field to use, and c is the number of the first character from the
114  beginning of the field. Fields and character posns are numbered starting
115  with 1; a character position of zero in pos2 indicates the field's last
116  character. If '.c' is omitted from pos1, it defaults to 1 (the beginning
117  of the field); if omitted from pos2, it defaults to 0 (the end of the
118  field). opts are ordering options (any of 'nr' as described above).
119 We assume that the fields in the key are separated by
120 map.output.key.field.separator.
121<P>
122
123<P>
124<HR>
125
126<P>
127
128<!-- ======== CONSTRUCTOR SUMMARY ======== -->
129
130<A NAME="constructor_summary"><!-- --></A>
131<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
132<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
133<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
134<B>Constructor Summary</B></FONT></TH>
135</TR>
136<TR BGCOLOR="white" CLASS="TableRowColor">
137<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedComparator.html#KeyFieldBasedComparator()">KeyFieldBasedComparator</A></B>()</CODE>
138
139<BR>
140&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
141</TR>
142</TABLE>
143&nbsp;
144<!-- ========== METHOD SUMMARY =========== -->
145
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149<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
150<B>Method Summary</B></FONT></TH>
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153<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
154<CODE>&nbsp;int</CODE></FONT></TD>
155<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedComparator.html#compare(byte[], int, int, byte[], int, int)">compare</A></B>(byte[]&nbsp;b1,
156        int&nbsp;s1,
157        int&nbsp;l1,
158        byte[]&nbsp;b2,
159        int&nbsp;s2,
160        int&nbsp;l2)</CODE>
161
162<BR>
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Optimization hook.</TD>
164</TR>
165<TR BGCOLOR="white" CLASS="TableRowColor">
166<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
167<CODE>&nbsp;void</CODE></FONT></TD>
168<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedComparator.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>
169
170<BR>
171&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>
172</TR>
173</TABLE>
174&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.io.WritableComparator"><!-- --></A>
175<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
176<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
177<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>
178</TR>
179<TR BGCOLOR="white" CLASS="TableRowColor">
180<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#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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190</TR>
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192&nbsp;<A NAME="methods_inherited_from_class_java.util.Comparator"><!-- --></A>
193<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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195<TH ALIGN="left"><B>Methods inherited from interface java.util.<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A></B></TH>
196</TR>
197<TR BGCOLOR="white" CLASS="TableRowColor">
198<TD><CODE><A HREF="http://java.sun.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>
199</TR>
200</TABLE>
201&nbsp;
202<P>
203
204<!-- ========= CONSTRUCTOR DETAIL ======== -->
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210<B>Constructor Detail</B></FONT></TH>
211</TR>
212</TABLE>
213
214<A NAME="KeyFieldBasedComparator()"><!-- --></A><H3>
215KeyFieldBasedComparator</H3>
216<PRE>
217public <B>KeyFieldBasedComparator</B>()</PRE>
218<DL>
219</DL>
220
221<!-- ============ METHOD DETAIL ========== -->
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227<B>Method Detail</B></FONT></TH>
228</TR>
229</TABLE>
230
231<A NAME="configure(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
232configure</H3>
233<PRE>
234public void <B>configure</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
235<DL>
236<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>
237<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>.
238<P>
239<DD><DL>
240<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>
241</DD>
242<DD><DL>
243<DT><B>Parameters:</B><DD><CODE>job</CODE> - the configuration</DL>
244</DD>
245</DL>
246<HR>
247
248<A NAME="compare(byte[], int, int, byte[], int, int)"><!-- --></A><H3>
249compare</H3>
250<PRE>
251public int <B>compare</B>(byte[]&nbsp;b1,
252                   int&nbsp;s1,
253                   int&nbsp;l1,
254                   byte[]&nbsp;b2,
255                   int&nbsp;s2,
256                   int&nbsp;l2)</PRE>
257<DL>
258<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>
259<DD>Optimization hook.  Override this to make SequenceFile.Sorter's scream.
260
261 <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>.
262<P>
263<DD><DL>
264<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>
265</DD>
266<DD><DL>
267</DL>
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