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FieldSelectionMapper (Apache Hadoop Main 2.0.0-alpha API)
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org.apache.hadoop.mapreduce.lib.fieldsel</FONT>
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Class FieldSelectionMapper&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/Mapper.html" title="class in org.apache.hadoop.mapreduce">org.apache.hadoop.mapreduce.Mapper</A>&lt;K,V,<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.FieldSelectionMapper&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/FieldSelectionMapper.html#line.61"><B>FieldSelectionMapper&lt;K,V&gt;</B></A><DT>extends <A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</A>&lt;K,V,<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 mapper 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 map output keys,
 and a list of fields that form the map output values. If the inputformat is
 TextInputFormat, the mapper will ignore the key to the map function. and the
 fields are from the value only. Otherwise, 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 map output field list spec is under attribute 
 "mapreduce.fieldsel.map.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>

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

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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/FieldSelectionMapper.html#LOG">LOG</A></B></CODE>

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&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/FieldSelectionMapper.html#FieldSelectionMapper()">FieldSelectionMapper</A></B>()</CODE>

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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html#map(K, V, org.apache.hadoop.mapreduce.Mapper.Context)">map</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html" title="type parameter in FieldSelectionMapper">K</A>&nbsp;key,
       <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html" title="type parameter in FieldSelectionMapper">V</A>&nbsp;val,
       org.apache.hadoop.mapreduce.Mapper.Context&nbsp;context)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The identify function.</TD>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html#setup(org.apache.hadoop.mapreduce.Mapper.Context)">setup</A></B>(org.apache.hadoop.mapreduce.Mapper.Context&nbsp;context)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Called once at the beginning of the task.</TD>
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<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.mapreduce.<A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</A></B></TH>
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<TD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html#cleanup(org.apache.hadoop.mapreduce.Mapper.Context)">cleanup</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html#run(org.apache.hadoop.mapreduce.Mapper.Context)">run</A></CODE></TD>
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<!-- ============ FIELD DETAIL =========== -->

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<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/FieldSelectionMapper.html#line.76"><B>LOG</B></A></PRE>
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<DL>
</DL>
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<A NAME="FieldSelectionMapper()"><!-- --></A><H3>
FieldSelectionMapper</H3>
<PRE>
public <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html#line.61"><B>FieldSelectionMapper</B></A>()</PRE>
<DL>
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<A NAME="setup(org.apache.hadoop.mapreduce.Mapper.Context)"><!-- --></A><H3>
setup</H3>
<PRE>
public void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html#line.78"><B>setup</B></A>(org.apache.hadoop.mapreduce.Mapper.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/Mapper.html#setup(org.apache.hadoop.mapreduce.Mapper.Context)">Mapper</A></CODE></B></DD>
<DD>Called once at the beginning of the task.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html#setup(org.apache.hadoop.mapreduce.Mapper.Context)">setup</A></CODE> in class <CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html" title="type parameter in FieldSelectionMapper">K</A>,<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html" title="type parameter in FieldSelectionMapper">V</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="map(java.lang.Object,java.lang.Object,org.apache.hadoop.mapreduce.Mapper.Context)"><!-- --></A><A NAME="map(K, V, org.apache.hadoop.mapreduce.Mapper.Context)"><!-- --></A><H3>
map</H3>
<PRE>
public void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html#line.101"><B>map</B></A>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html" title="type parameter in FieldSelectionMapper">K</A>&nbsp;key,
                <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html" title="type parameter in FieldSelectionMapper">V</A>&nbsp;val,
                org.apache.hadoop.mapreduce.Mapper.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>The identify function. Input key/value pair is written directly to output.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html#map(KEYIN, VALUEIN, org.apache.hadoop.mapreduce.Mapper.Context)">map</A></CODE> in class <CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html" title="type parameter in FieldSelectionMapper">K</A>,<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionMapper.html" title="type parameter in FieldSelectionMapper">V</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>
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