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7PiEstimator (Hadoop 0.20.1 API)
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91org.apache.hadoop.examples</FONT>
92<BR>
93Class PiEstimator</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/conf/Configured.html" title="class in org.apache.hadoop.conf">org.apache.hadoop.conf.Configured</A>
97      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.examples.PiEstimator</B>
98</PRE>
99<DL>
100<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A>, <A HREF="../../../../org/apache/hadoop/util/Tool.html" title="interface in org.apache.hadoop.util">Tool</A></DD>
101</DL>
102<HR>
103<DL>
104<DT><PRE>public class <B>PiEstimator</B><DT>extends <A HREF="../../../../org/apache/hadoop/conf/Configured.html" title="class in org.apache.hadoop.conf">Configured</A><DT>implements <A HREF="../../../../org/apache/hadoop/util/Tool.html" title="interface in org.apache.hadoop.util">Tool</A></DL>
105</PRE>
106
107<P>
108A Map-reduce program to estimate the value of Pi
109 using quasi-Monte Carlo method.
110
111 Mapper:
112   Generate points in a unit square
113   and then count points inside/outside of the inscribed circle of the square.
114
115 Reducer:
116   Accumulate points inside/outside results from the mappers.
117
118 Let numTotal = numInside + numOutside.
119 The fraction numInside/numTotal is a rational approximation of
120 the value (Area of the circle)/(Area of the square),
121 where the area of the inscribed circle is Pi/4
122 and the area of unit square is 1.
123 Then, Pi is estimated value to be 4(numInside/numTotal).
124<P>
125
126<P>
127<HR>
128
129<P>
130<!-- ======== NESTED CLASS SUMMARY ======== -->
131
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136<B>Nested Class Summary</B></FONT></TH>
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138<TR BGCOLOR="white" CLASS="TableRowColor">
139<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
140<CODE>static&nbsp;class</CODE></FONT></TD>
141<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/PiEstimator.PiMapper.html" title="class in org.apache.hadoop.examples">PiEstimator.PiMapper</A></B></CODE>
142
143<BR>
144&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mapper class for Pi estimation.</TD>
145</TR>
146<TR BGCOLOR="white" CLASS="TableRowColor">
147<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
148<CODE>static&nbsp;class</CODE></FONT></TD>
149<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/PiEstimator.PiReducer.html" title="class in org.apache.hadoop.examples">PiEstimator.PiReducer</A></B></CODE>
150
151<BR>
152&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reducer class for Pi estimation.</TD>
153</TR>
154</TABLE>
155&nbsp;
156<!-- ======== CONSTRUCTOR SUMMARY ======== -->
157
158<A NAME="constructor_summary"><!-- --></A>
159<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
160<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
161<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
162<B>Constructor Summary</B></FONT></TH>
163</TR>
164<TR BGCOLOR="white" CLASS="TableRowColor">
165<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/PiEstimator.html#PiEstimator()">PiEstimator</A></B>()</CODE>
166
167<BR>
168&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
169</TR>
170</TABLE>
171&nbsp;
172<!-- ========== METHOD SUMMARY =========== -->
173
174<A NAME="method_summary"><!-- --></A>
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178<B>Method Summary</B></FONT></TH>
179</TR>
180<TR BGCOLOR="white" CLASS="TableRowColor">
181<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
182<CODE>static&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/math/BigDecimal.html?is-external=true" title="class or interface in java.math">BigDecimal</A></CODE></FONT></TD>
183<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/PiEstimator.html#estimate(int, long, org.apache.hadoop.mapred.JobConf)">estimate</A></B>(int&nbsp;numMaps,
184         long&nbsp;numPoints,
185         <A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;jobConf)</CODE>
186
187<BR>
188&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Run a map/reduce job for estimating Pi.</TD>
189</TR>
190<TR BGCOLOR="white" CLASS="TableRowColor">
191<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
192<CODE>static&nbsp;void</CODE></FONT></TD>
193<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/PiEstimator.html#main(java.lang.String[])">main</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;argv)</CODE>
194
195<BR>
196&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;main method for running it as a stand alone command.</TD>
197</TR>
198<TR BGCOLOR="white" CLASS="TableRowColor">
199<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
200<CODE>&nbsp;int</CODE></FONT></TD>
201<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/PiEstimator.html#run(java.lang.String[])">run</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args)</CODE>
202
203<BR>
204&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Parse arguments and then runs a map/reduce job.</TD>
205</TR>
206</TABLE>
207&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.conf.Configured"><!-- --></A>
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211</TR>
212<TR BGCOLOR="white" CLASS="TableRowColor">
213<TD><CODE><A HREF="../../../../org/apache/hadoop/conf/Configured.html#getConf()">getConf</A>, <A HREF="../../../../org/apache/hadoop/conf/Configured.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></CODE></TD>
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229</TR>
230<TR BGCOLOR="white" CLASS="TableRowColor">
231<TD><CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html#getConf()">getConf</A>, <A HREF="../../../../org/apache/hadoop/conf/Configurable.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></CODE></TD>
232</TR>
233</TABLE>
234&nbsp;
235<P>
236
237<!-- ========= CONSTRUCTOR DETAIL ======== -->
238
239<A NAME="constructor_detail"><!-- --></A>
240<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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242<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
243<B>Constructor Detail</B></FONT></TH>
244</TR>
245</TABLE>
246
247<A NAME="PiEstimator()"><!-- --></A><H3>
248PiEstimator</H3>
249<PRE>
250public <B>PiEstimator</B>()</PRE>
251<DL>
252</DL>
253
254<!-- ============ METHOD DETAIL ========== -->
255
256<A NAME="method_detail"><!-- --></A>
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260<B>Method Detail</B></FONT></TH>
261</TR>
262</TABLE>
263
264<A NAME="estimate(int, long, org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
265estimate</H3>
266<PRE>
267public static <A HREF="http://java.sun.com/javase/6/docs/api/java/math/BigDecimal.html?is-external=true" title="class or interface in java.math">BigDecimal</A> <B>estimate</B>(int&nbsp;numMaps,
268                                  long&nbsp;numPoints,
269                                  <A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;jobConf)
270                           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></PRE>
271<DL>
272<DD>Run a map/reduce job for estimating Pi.
273<P>
274<DD><DL>
275</DL>
276</DD>
277<DD><DL>
278
279<DT><B>Returns:</B><DD>the estimated value of Pi
280<DT><B>Throws:</B>
281<DD><CODE><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></CODE></DL>
282</DD>
283</DL>
284<HR>
285
286<A NAME="run(java.lang.String[])"><!-- --></A><H3>
287run</H3>
288<PRE>
289public int <B>run</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args)
290        throws <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></PRE>
291<DL>
292<DD>Parse arguments and then runs a map/reduce job.
293 Print output in standard out.
294<P>
295<DD><DL>
296<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/util/Tool.html#run(java.lang.String[])">run</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/util/Tool.html" title="interface in org.apache.hadoop.util">Tool</A></CODE></DL>
297</DD>
298<DD><DL>
299<DT><B>Parameters:</B><DD><CODE>args</CODE> - command specific arguments.
300<DT><B>Returns:</B><DD>a non-zero if there is an error.  Otherwise, return 0.
301<DT><B>Throws:</B>
302<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></CODE></DL>
303</DD>
304</DL>
305<HR>
306
307<A NAME="main(java.lang.String[])"><!-- --></A><H3>
308main</H3>
309<PRE>
310public static void <B>main</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;argv)
311                 throws <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></PRE>
312<DL>
313<DD>main method for running it as a stand alone command.
314<P>
315<DD><DL>
316</DL>
317</DD>
318<DD><DL>
319
320<DT><B>Throws:</B>
321<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></CODE></DL>
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