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7MultithreadedMapper (Hadoop 0.20.1 API)
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79  SUMMARY:&nbsp;<A HREF="#nested_classes_inherited_from_class_org.apache.hadoop.mapreduce.Mapper">NESTED</A>&nbsp;|&nbsp;FIELD&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
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91org.apache.hadoop.mapreduce.lib.map</FONT>
92<BR>
93Class MultithreadedMapper&lt;K1,V1,K2,V2&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/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">org.apache.hadoop.mapreduce.Mapper</A>&lt;K1,V1,K2,V2&gt;
97      <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper&lt;K1,V1,K2,V2&gt;</B>
98</PRE>
99<HR>
100<DL>
101<DT><PRE>public class <B>MultithreadedMapper&lt;K1,V1,K2,V2&gt;</B><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>
102</PRE>
103
104<P>
105Multithreaded implementation for @link org.apache.hadoop.mapreduce.Mapper.
106 <p>
107 It can be used instead of the default implementation,
108<P>
109
110<P>
111<HR>
112
113<P>
114<!-- ======== NESTED CLASS SUMMARY ======== -->
115
116<A NAME="nested_class_summary"><!-- --></A>
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119<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
120<B>Nested Class Summary</B></FONT></TH>
121</TR>
122</TABLE>
123&nbsp;<A NAME="nested_classes_inherited_from_class_org.apache.hadoop.mapreduce.Mapper"><!-- --></A>
124<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
125<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
126<TH ALIGN="left"><B>Nested classes/interfaces 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>
127</TR>
128<TR BGCOLOR="white" CLASS="TableRowColor">
129<TD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.Context.html" title="class in org.apache.hadoop.mapreduce">Mapper.Context</A></CODE></TD>
130</TR>
131</TABLE>
132&nbsp;
133
134<!-- ======== CONSTRUCTOR SUMMARY ======== -->
135
136<A NAME="constructor_summary"><!-- --></A>
137<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
138<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
139<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
140<B>Constructor Summary</B></FONT></TH>
141</TR>
142<TR BGCOLOR="white" CLASS="TableRowColor">
143<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#MultithreadedMapper()">MultithreadedMapper</A></B>()</CODE>
144
145<BR>
146&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
147</TR>
148</TABLE>
149&nbsp;
150<!-- ========== METHOD SUMMARY =========== -->
151
152<A NAME="method_summary"><!-- --></A>
153<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
154<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
155<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
156<B>Method Summary</B></FONT></TH>
157</TR>
158<TR BGCOLOR="white" CLASS="TableRowColor">
159<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
160<CODE>static
161<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
162<TR ALIGN="right" VALIGN="">
163<TD NOWRAP><FONT SIZE="-1">
164<CODE>&lt;K1,V1,K2,V2&gt; 
165<BR>
166<A HREF="http://java.sun.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>
167</TR>
168</TABLE>
169</CODE></FONT></TD>
170<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="class in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;job)</CODE>
171
172<BR>
173&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the application's mapper class.</TD>
174</TR>
175<TR BGCOLOR="white" CLASS="TableRowColor">
176<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
177<CODE>static&nbsp;int</CODE></FONT></TD>
178<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="class in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;job)</CODE>
179
180<BR>
181&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>
182</TR>
183<TR BGCOLOR="white" CLASS="TableRowColor">
184<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
185<CODE>&nbsp;void</CODE></FONT></TD>
186<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#run(org.apache.hadoop.mapreduce.Mapper.Context)">run</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.Context.html" title="class in org.apache.hadoop.mapreduce">Mapper.Context</A>&nbsp;context)</CODE>
187
188<BR>
189&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Run the application's maps using a thread pool.</TD>
190</TR>
191<TR BGCOLOR="white" CLASS="TableRowColor">
192<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
193<CODE>static
194<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
195<TR ALIGN="right" VALIGN="">
196<TD NOWRAP><FONT SIZE="-1">
197<CODE>&lt;K1,V1,K2,V2&gt; 
198<BR>
199void</CODE></FONT></TD>
200</TR>
201</TABLE>
202</CODE></FONT></TD>
203<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,
204               <A HREF="http://java.sun.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>
205
206<BR>
207&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the application's mapper class.</TD>
208</TR>
209<TR BGCOLOR="white" CLASS="TableRowColor">
210<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
211<CODE>static&nbsp;void</CODE></FONT></TD>
212<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,
213                   int&nbsp;threads)</CODE>
214
215<BR>
216&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the number of threads in the pool for running maps.</TD>
217</TR>
218</TABLE>
219&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapreduce.Mapper"><!-- --></A>
220<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
221<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
222<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>
223</TR>
224<TR BGCOLOR="white" CLASS="TableRowColor">
225<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>
226</TR>
227</TABLE>
228&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
229<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
230<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
231<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
232</TR>
233<TR BGCOLOR="white" CLASS="TableRowColor">
234<TD><CODE><A HREF="http://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.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>
235</TR>
236</TABLE>
237&nbsp;
238<P>
239
240<!-- ========= CONSTRUCTOR DETAIL ======== -->
241
242<A NAME="constructor_detail"><!-- --></A>
243<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
244<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
245<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
246<B>Constructor Detail</B></FONT></TH>
247</TR>
248</TABLE>
249
250<A NAME="MultithreadedMapper()"><!-- --></A><H3>
251MultithreadedMapper</H3>
252<PRE>
253public <B>MultithreadedMapper</B>()</PRE>
254<DL>
255</DL>
256
257<!-- ============ METHOD DETAIL ========== -->
258
259<A NAME="method_detail"><!-- --></A>
260<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
261<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
262<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
263<B>Method Detail</B></FONT></TH>
264</TR>
265</TABLE>
266
267<A NAME="getNumberOfThreads(org.apache.hadoop.mapreduce.JobContext)"><!-- --></A><H3>
268getNumberOfThreads</H3>
269<PRE>
270public static int <B>getNumberOfThreads</B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;job)</PRE>
271<DL>
272<DD>The number of threads in the thread pool that will run the map function.
273<P>
274<DD><DL>
275<DT><B>Parameters:</B><DD><CODE>job</CODE> - the job
276<DT><B>Returns:</B><DD>the number of threads</DL>
277</DD>
278</DL>
279<HR>
280
281<A NAME="setNumberOfThreads(org.apache.hadoop.mapreduce.Job, int)"><!-- --></A><H3>
282setNumberOfThreads</H3>
283<PRE>
284public static void <B>setNumberOfThreads</B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</A>&nbsp;job,
285                                      int&nbsp;threads)</PRE>
286<DL>
287<DD>Set the number of threads in the pool for running maps.
288<P>
289<DD><DL>
290<DT><B>Parameters:</B><DD><CODE>job</CODE> - the job to modify<DD><CODE>threads</CODE> - the new number of threads</DL>
291</DD>
292</DL>
293<HR>
294
295<A NAME="getMapperClass(org.apache.hadoop.mapreduce.JobContext)"><!-- --></A><H3>
296getMapperClass</H3>
297<PRE>
298public static &lt;K1,V1,K2,V2&gt; <A HREF="http://java.sun.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; <B>getMapperClass</B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;job)</PRE>
299<DL>
300<DD>Get the application's mapper class.
301<P>
302<DD><DL>
303<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
304<DT><B>Returns:</B><DD>the mapper class to run</DL>
305</DD>
306</DL>
307<HR>
308
309<A NAME="setMapperClass(org.apache.hadoop.mapreduce.Job, java.lang.Class)"><!-- --></A><H3>
310setMapperClass</H3>
311<PRE>
312public static &lt;K1,V1,K2,V2&gt; void <B>setMapperClass</B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</A>&nbsp;job,
313                                                <A HREF="http://java.sun.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>
314<DL>
315<DD>Set the application's mapper class.
316<P>
317<DD><DL>
318<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>
319</DD>
320</DL>
321<HR>
322
323<A NAME="run(org.apache.hadoop.mapreduce.Mapper.Context)"><!-- --></A><H3>
324run</H3>
325<PRE>
326public void <B>run</B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/Mapper.Context.html" title="class in org.apache.hadoop.mapreduce">Mapper.Context</A>&nbsp;context)
327         throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A>,
328                <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
329<DL>
330<DD>Run the application's maps using a thread pool.
331<P>
332<DD><DL>
333<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>
334</DD>
335<DD><DL>
336
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