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FieldSelectionReducer (Apache Hadoop Main 2.0.0-alpha API)
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org.apache.hadoop.mapreduce.lib.fieldsel</FONT>
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Class FieldSelectionReducer&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/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce">org.apache.hadoop.mapreduce.Reducer</A>&lt;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt;
      <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapreduce.lib.fieldsel.FieldSelectionReducer&lt;K,V&gt;</B>
</PRE>
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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/fieldsel/FieldSelectionReducer.html#line.60"><B>FieldSelectionReducer&lt;K,V&gt;</B></A><DT>extends <A HREF="../../../../../../org/apache/hadoop/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce">Reducer</A>&lt;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt;</DL>
</PRE>

<P>
This class implements a reducer class that can be used to perform field
 selections in a manner similar to unix cut. 
 
 The input data is treated as fields separated by a user specified
 separator (the default value is "\t"). The user can specify a list of
 fields that form the reduce output keys, and a list of fields that form
 the reduce output values. The fields are the union of those from the key
 and those from the value.
 
 The field separator is under attribute "mapreduce.fieldsel.data.field.separator"
 
 The reduce output field list spec is under attribute 
 "mapreduce.fieldsel.reduce.output.key.value.fields.spec". 
 The value is expected to be like
 "keyFieldsSpec:valueFieldsSpec" key/valueFieldsSpec are comma (,) 
 separated field spec: fieldSpec,fieldSpec,fieldSpec ... Each field spec
 can be a simple number (e.g. 5) specifying a specific field, or a range
 (like 2-5) to specify a range of fields, or an open range (like 3-) 
 specifying all the fields starting from field 3. The open range field
 spec applies value fields only. They have no effect on the key fields.
 
 Here is an example: "4,3,0,1:6,5,1-3,7-". It specifies to use fields
 4,3,0 and 1 for keys, and use fields 6,5,1,2,3,7 and above for values.
<P>

<P>
<HR>

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

<A NAME="field_summary"><!-- --></A>
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<B>Field Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;org.apache.commons.logging.Log</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionReducer.html#LOG">LOG</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/fieldsel/FieldSelectionReducer.html#FieldSelectionReducer()">FieldSelectionReducer</A></B>()</CODE>

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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionReducer.html#reduce(org.apache.hadoop.io.Text, java.lang.Iterable, org.apache.hadoop.mapreduce.Reducer.Context)">reduce</A></B>(<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;key,
             <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</A>&lt;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt;&nbsp;values,
             org.apache.hadoop.mapreduce.Reducer.Context&nbsp;context)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This method is called once for each key.</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/fieldsel/FieldSelectionReducer.html#setup(org.apache.hadoop.mapreduce.Reducer.Context)">setup</A></B>(org.apache.hadoop.mapreduce.Reducer.Context&nbsp;context)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Called once at the start of the task.</TD>
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.mapreduce.<A HREF="../../../../../../org/apache/hadoop/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce">Reducer</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Reducer.html#cleanup(org.apache.hadoop.mapreduce.Reducer.Context)">cleanup</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/Reducer.html#run(org.apache.hadoop.mapreduce.Reducer.Context)">run</A></CODE></TD>
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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 =========== -->

<A NAME="field_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>Field Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="LOG"><!-- --></A><H3>
LOG</H3>
<PRE>
public static final org.apache.commons.logging.Log <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionReducer.html#line.73"><B>LOG</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>
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<A NAME="FieldSelectionReducer()"><!-- --></A><H3>
FieldSelectionReducer</H3>
<PRE>
public <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionReducer.html#line.60"><B>FieldSelectionReducer</B></A>()</PRE>
<DL>
</DL>

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

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<B>Method Detail</B></FONT></TH>
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<A NAME="setup(org.apache.hadoop.mapreduce.Reducer.Context)"><!-- --></A><H3>
setup</H3>
<PRE>
public void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionReducer.html#line.75"><B>setup</B></A>(org.apache.hadoop.mapreduce.Reducer.Context&nbsp;context)
           throws <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A>,
                  <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Reducer.html#setup(org.apache.hadoop.mapreduce.Reducer.Context)">Reducer</A></CODE></B></DD>
<DD>Called once at the start of the task.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Reducer.html#setup(org.apache.hadoop.mapreduce.Reducer.Context)">setup</A></CODE> in class <CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce">Reducer</A>&lt;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt;</CODE></DL>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="reduce(org.apache.hadoop.io.Text, java.lang.Iterable, org.apache.hadoop.mapreduce.Reducer.Context)"><!-- --></A><H3>
reduce</H3>
<PRE>
public void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionReducer.html#line.94"><B>reduce</B></A>(<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;key,
                   <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</A>&lt;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt;&nbsp;values,
                   org.apache.hadoop.mapreduce.Reducer.Context&nbsp;context)
            throws <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A>,
                   <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Reducer.html#reduce(KEYIN, java.lang.Iterable, org.apache.hadoop.mapreduce.Reducer.Context)">Reducer</A></CODE></B></DD>
<DD>This method is called once for each key. Most applications will define
 their reduce class by overriding this method. The default implementation
 is an identity function.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Reducer.html#reduce(KEYIN, java.lang.Iterable, org.apache.hadoop.mapreduce.Reducer.Context)">reduce</A></CODE> in class <CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Reducer.html" title="class in org.apache.hadoop.mapreduce">Reducer</A>&lt;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt;</CODE></DL>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL>
</DD>
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