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7InputSampler (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapred.lib</FONT>
92<BR>
93Class InputSampler&lt;K,V&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 "><B>org.apache.hadoop.mapred.lib.InputSampler&lt;K,V&gt;</B>
97</PRE>
98<DL>
99<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>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>InputSampler&lt;K,V&gt;</B><DT>extends <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><DT>implements <A HREF="../../../../../org/apache/hadoop/util/Tool.html" title="interface in org.apache.hadoop.util">Tool</A></DL>
104</PRE>
105
106<P>
107Utility for collecting samples and writing a partition file for
108 <A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html" title="class in org.apache.hadoop.mapred.lib"><CODE>TotalOrderPartitioner</CODE></A>.
109<P>
110
111<P>
112<HR>
113
114<P>
115<!-- ======== NESTED CLASS SUMMARY ======== -->
116
117<A NAME="nested_class_summary"><!-- --></A>
118<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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120<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
121<B>Nested Class Summary</B></FONT></TH>
122</TR>
123<TR BGCOLOR="white" CLASS="TableRowColor">
124<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
125<CODE>static&nbsp;class</CODE></FONT></TD>
126<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.IntervalSampler.html" title="class in org.apache.hadoop.mapred.lib">InputSampler.IntervalSampler</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.IntervalSampler.html" title="type parameter in InputSampler.IntervalSampler">K</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.IntervalSampler.html" title="type parameter in InputSampler.IntervalSampler">V</A>&gt;</B></CODE>
127
128<BR>
129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sample from s splits at regular intervals.</TD>
130</TR>
131<TR BGCOLOR="white" CLASS="TableRowColor">
132<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
133<CODE>static&nbsp;class</CODE></FONT></TD>
134<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.RandomSampler.html" title="class in org.apache.hadoop.mapred.lib">InputSampler.RandomSampler</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.RandomSampler.html" title="type parameter in InputSampler.RandomSampler">K</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.RandomSampler.html" title="type parameter in InputSampler.RandomSampler">V</A>&gt;</B></CODE>
135
136<BR>
137&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sample from random points in the input.</TD>
138</TR>
139<TR BGCOLOR="white" CLASS="TableRowColor">
140<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
141<CODE>static&nbsp;interface</CODE></FONT></TD>
142<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.Sampler.html" title="interface in org.apache.hadoop.mapred.lib">InputSampler.Sampler</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.Sampler.html" title="type parameter in InputSampler.Sampler">K</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.Sampler.html" title="type parameter in InputSampler.Sampler">V</A>&gt;</B></CODE>
143
144<BR>
145&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interface to sample using an <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A>.</TD>
146</TR>
147<TR BGCOLOR="white" CLASS="TableRowColor">
148<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
149<CODE>static&nbsp;class</CODE></FONT></TD>
150<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.SplitSampler.html" title="class in org.apache.hadoop.mapred.lib">InputSampler.SplitSampler</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.SplitSampler.html" title="type parameter in InputSampler.SplitSampler">K</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.SplitSampler.html" title="type parameter in InputSampler.SplitSampler">V</A>&gt;</B></CODE>
151
152<BR>
153&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Samples the first n records from s splits.</TD>
154</TR>
155</TABLE>
156&nbsp;
157<!-- ======== CONSTRUCTOR SUMMARY ======== -->
158
159<A NAME="constructor_summary"><!-- --></A>
160<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
161<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
162<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
163<B>Constructor Summary</B></FONT></TH>
164</TR>
165<TR BGCOLOR="white" CLASS="TableRowColor">
166<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.html#InputSampler(org.apache.hadoop.mapred.JobConf)">InputSampler</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf)</CODE>
167
168<BR>
169&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
170</TR>
171</TABLE>
172&nbsp;
173<!-- ========== METHOD SUMMARY =========== -->
174
175<A NAME="method_summary"><!-- --></A>
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178<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
179<B>Method Summary</B></FONT></TH>
180</TR>
181<TR BGCOLOR="white" CLASS="TableRowColor">
182<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
183<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A></CODE></FONT></TD>
184<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.html#getConf()">getConf</A></B>()</CODE>
185
186<BR>
187&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the configuration used by this object.</TD>
188</TR>
189<TR BGCOLOR="white" CLASS="TableRowColor">
190<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
191<CODE>static&nbsp;void</CODE></FONT></TD>
192<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.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;args)</CODE>
193
194<BR>
195&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
196</TR>
197<TR BGCOLOR="white" CLASS="TableRowColor">
198<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
199<CODE>&nbsp;int</CODE></FONT></TD>
200<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.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>
201
202<BR>
203&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Driver for InputSampler from the command line.</TD>
204</TR>
205<TR BGCOLOR="white" CLASS="TableRowColor">
206<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
207<CODE>&nbsp;void</CODE></FONT></TD>
208<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></B>(<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
209
210<BR>
211&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the configuration to be used by this object.</TD>
212</TR>
213<TR BGCOLOR="white" CLASS="TableRowColor">
214<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
215<CODE>static
216<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
217<TR ALIGN="right" VALIGN="">
218<TD NOWRAP><FONT SIZE="-1">
219<CODE>&lt;K,V&gt; void</CODE></FONT></TD>
220</TR>
221</TABLE>
222</CODE></FONT></TD>
223<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.html#writePartitionFile(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.lib.InputSampler.Sampler)">writePartitionFile</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
224                   <A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.Sampler.html" title="interface in org.apache.hadoop.mapred.lib">InputSampler.Sampler</A>&lt;K,V&gt;&nbsp;sampler)</CODE>
225
226<BR>
227&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Write a partition file for the given job, using the Sampler provided.</TD>
228</TR>
229</TABLE>
230&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
231<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
232<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
233<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>
234</TR>
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237</TR>
238</TABLE>
239&nbsp;
240<P>
241
242<!-- ========= CONSTRUCTOR DETAIL ======== -->
243
244<A NAME="constructor_detail"><!-- --></A>
245<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
246<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
247<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
248<B>Constructor Detail</B></FONT></TH>
249</TR>
250</TABLE>
251
252<A NAME="InputSampler(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
253InputSampler</H3>
254<PRE>
255public <B>InputSampler</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf)</PRE>
256<DL>
257</DL>
258
259<!-- ============ METHOD DETAIL ========== -->
260
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263<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
264<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
265<B>Method Detail</B></FONT></TH>
266</TR>
267</TABLE>
268
269<A NAME="getConf()"><!-- --></A><H3>
270getConf</H3>
271<PRE>
272public <A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A> <B>getConf</B>()</PRE>
273<DL>
274<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html#getConf()">Configurable</A></CODE></B></DD>
275<DD>Return the configuration used by this object.
276<P>
277<DD><DL>
278<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html#getConf()">getConf</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></CODE></DL>
279</DD>
280<DD><DL>
281</DL>
282</DD>
283</DL>
284<HR>
285
286<A NAME="setConf(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
287setConf</H3>
288<PRE>
289public void <B>setConf</B>(<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
290<DL>
291<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html#setConf(org.apache.hadoop.conf.Configuration)">Configurable</A></CODE></B></DD>
292<DD>Set the configuration to be used by this object.
293<P>
294<DD><DL>
295<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></CODE></DL>
296</DD>
297<DD><DL>
298</DL>
299</DD>
300</DL>
301<HR>
302
303<A NAME="writePartitionFile(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.lib.InputSampler.Sampler)"><!-- --></A><H3>
304writePartitionFile</H3>
305<PRE>
306public static &lt;K,V&gt; void <B>writePartitionFile</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
307                                            <A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.Sampler.html" title="interface in org.apache.hadoop.mapred.lib">InputSampler.Sampler</A>&lt;K,V&gt;&nbsp;sampler)
308                               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>
309<DL>
310<DD>Write a partition file for the given job, using the Sampler provided.
311 Queries the sampler for a sample keyset, sorts by the output key
312 comparator, selects the keys for each rank, and writes to the destination
313 returned from <A HREF="../../../../../org/apache/hadoop/mapred/lib/TotalOrderPartitioner.html#getPartitionFile(org.apache.hadoop.mapred.JobConf)"><CODE>TotalOrderPartitioner.getPartitionFile(org.apache.hadoop.mapred.JobConf)</CODE></A>.
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/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
322</DD>
323</DL>
324<HR>
325
326<A NAME="run(java.lang.String[])"><!-- --></A><H3>
327run</H3>
328<PRE>
329public 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)
330        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>
331<DL>
332<DD>Driver for InputSampler from the command line.
333 Configures a JobConf instance and calls <A HREF="../../../../../org/apache/hadoop/mapred/lib/InputSampler.html#writePartitionFile(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.lib.InputSampler.Sampler)"><CODE>writePartitionFile(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.lib.InputSampler.Sampler<K, V>)</CODE></A>.
334<P>
335<DD><DL>
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337</DD>
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339<DT><B>Parameters:</B><DD><CODE>args</CODE> - command specific arguments.
340<DT><B>Returns:</B><DD>exit code.
341<DT><B>Throws:</B>
342<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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