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MultithreadedMapper (Apache Hadoop Main 2.0.0-alpha API)
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org.apache.hadoop.mapreduce.lib.map</FONT>
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Class MultithreadedMapper&lt;K1,V1,K2,V2&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;K1,V1,K2,V2&gt;
      <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper&lt;K1,V1,K2,V2&gt;</B>
</PRE>
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<DL>
<DT><PRE><FONT SIZE="-1">@InterfaceAudience.Public
@InterfaceStability.Stable
</FONT>public class <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#line.61"><B>MultithreadedMapper&lt;K1,V1,K2,V2&gt;</B></A><DT>extends <A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</A>&lt;K1,V1,K2,V2&gt;</DL>
</PRE>

<P>
Multithreaded implementation for @link org.apache.hadoop.mapreduce.Mapper.
 <p>
 It can be used instead of the default implementation,
<P>

<P>
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<!-- =========== 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/map/MultithreadedMapper.html#MAP_CLASS">MAP_CLASS</A></B></CODE>

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&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/map/MultithreadedMapper.html#NUM_THREADS">NUM_THREADS</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/map/MultithreadedMapper.html#MultithreadedMapper()">MultithreadedMapper</A></B>()</CODE>

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<CODE>static
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
<TR ALIGN="right" VALIGN="">
<TD NOWRAP><FONT SIZE="-1">
<CODE>&lt;K1,V1,K2,V2&gt; 
<BR>
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</A>&lt;K1,V1,K2,V2&gt;&gt;</CODE></FONT></TD>
</TR>
</TABLE>
</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#getMapperClass(org.apache.hadoop.mapreduce.JobContext)">getMapperClass</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 application's mapper class.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#getNumberOfThreads(org.apache.hadoop.mapreduce.JobContext)">getNumberOfThreads</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;The number of threads in the thread pool that will run the map function.</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/map/MultithreadedMapper.html#run(org.apache.hadoop.mapreduce.Mapper.Context)">run</A></B>(org.apache.hadoop.mapreduce.Mapper.Context&nbsp;context)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Run the application's maps using a thread pool.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
<TR ALIGN="right" VALIGN="">
<TD NOWRAP><FONT SIZE="-1">
<CODE>&lt;K1,V1,K2,V2&gt; 
<BR>
void</CODE></FONT></TD>
</TR>
</TABLE>
</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#setMapperClass(org.apache.hadoop.mapreduce.Job, java.lang.Class)">setMapperClass</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/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</A>&lt;K1,V1,K2,V2&gt;&gt;&nbsp;cls)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the application's mapper class.</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/map/MultithreadedMapper.html#setNumberOfThreads(org.apache.hadoop.mapreduce.Job, int)">setNumberOfThreads</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</A>&nbsp;job,
                                     int&nbsp;threads)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the number of threads in the pool for running maps.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapreduce.Mapper"><!-- --></A>
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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/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<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#map(KEYIN, VALUEIN, org.apache.hadoop.mapreduce.Mapper.Context)">map</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html#setup(org.apache.hadoop.mapreduce.Mapper.Context)">setup</A></CODE></TD>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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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">
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<A NAME="NUM_THREADS"><!-- --></A><H3>
NUM_THREADS</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/map/MultithreadedMapper.html#line.65"><B>NUM_THREADS</B></A></PRE>
<DL>
<DL>
</DL>
</DL>
<HR>

<A NAME="MAP_CLASS"><!-- --></A><H3>
MAP_CLASS</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/map/MultithreadedMapper.html#line.66"><B>MAP_CLASS</B></A></PRE>
<DL>
<DL>
</DL>
</DL>

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

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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<A NAME="MultithreadedMapper()"><!-- --></A><H3>
MultithreadedMapper</H3>
<PRE>
public <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#line.61"><B>MultithreadedMapper</B></A>()</PRE>
<DL>
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<A NAME="getNumberOfThreads(org.apache.hadoop.mapreduce.JobContext)"><!-- --></A><H3>
getNumberOfThreads</H3>
<PRE>
public static int <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#line.77"><B>getNumberOfThreads</B></A>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;job)</PRE>
<DL>
<DD>The number of threads in the thread pool that will run the map function.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>job</CODE> - the job
<DT><B>Returns:</B><DD>the number of threads</DL>
</DD>
</DL>
<HR>

<A NAME="setNumberOfThreads(org.apache.hadoop.mapreduce.Job, int)"><!-- --></A><H3>
setNumberOfThreads</H3>
<PRE>
public static void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#line.86"><B>setNumberOfThreads</B></A>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</A>&nbsp;job,
                                      int&nbsp;threads)</PRE>
<DL>
<DD>Set the number of threads in the pool for running maps.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>job</CODE> - the job to modify<DD><CODE>threads</CODE> - the new number of threads</DL>
</DD>
</DL>
<HR>

<A NAME="getMapperClass(org.apache.hadoop.mapreduce.JobContext)"><!-- --></A><H3>
getMapperClass</H3>
<PRE>
public static &lt;K1,V1,K2,V2&gt; <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</A>&lt;K1,V1,K2,V2&gt;&gt; <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#line.101"><B>getMapperClass</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 application's mapper class.
<P>
<DD><DL>
<DT><B>Type Parameters:</B><DD><CODE>K1</CODE> - the map's input key type<DD><CODE>V1</CODE> - the map's input value type<DD><CODE>K2</CODE> - the map's output key type<DD><CODE>V2</CODE> - the map's output value type<DT><B>Parameters:</B><DD><CODE>job</CODE> - the job
<DT><B>Returns:</B><DD>the mapper class to run</DL>
</DD>
</DL>
<HR>

<A NAME="setMapperClass(org.apache.hadoop.mapreduce.Job, java.lang.Class)"><!-- --></A><H3>
setMapperClass</H3>
<PRE>
public static &lt;K1,V1,K2,V2&gt; void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#line.116"><B>setMapperClass</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/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</A>&lt;K1,V1,K2,V2&gt;&gt;&nbsp;cls)</PRE>
<DL>
<DD>Set the application's mapper class.
<P>
<DD><DL>
<DT><B>Type Parameters:</B><DD><CODE>K1</CODE> - the map input key type<DD><CODE>V1</CODE> - the map input value type<DD><CODE>K2</CODE> - the map output key type<DD><CODE>V2</CODE> - the map output value type<DT><B>Parameters:</B><DD><CODE>job</CODE> - the job to modify<DD><CODE>cls</CODE> - the class to use as the mapper</DL>
</DD>
</DL>
<HR>

<A NAME="run(org.apache.hadoop.mapreduce.Mapper.Context)"><!-- --></A><H3>
run</H3>
<PRE>
public void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#line.129"><B>run</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>Run the application's maps using a thread pool.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.html#run(org.apache.hadoop.mapreduce.Mapper.Context)">run</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/map/MultithreadedMapper.html" title="type parameter in MultithreadedMapper">K1</A>,<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html" title="type parameter in MultithreadedMapper">V1</A>,<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html" title="type parameter in MultithreadedMapper">K2</A>,<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html" title="type parameter in MultithreadedMapper">V2</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>
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