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7ValueAggregatorJob (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapred.lib.aggregate</FONT>
92<BR>
93Class ValueAggregatorJob</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.aggregate.ValueAggregatorJob</B>
97</PRE>
98<HR>
99<DL>
100<DT><PRE>public class <B>ValueAggregatorJob</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></DL>
101</PRE>
102
103<P>
104This is the main class for creating a map/reduce job using Aggregate
105 framework. The Aggregate is a specialization of map/reduce framework,
106 specilizing for performing various simple aggregations.
107 
108 Generally speaking, in order to implement an application using Map/Reduce
109 model, the developer is to implement Map and Reduce functions (and possibly
110 combine function). However, a lot of applications related to counting and
111 statistics computing have very similar characteristics. Aggregate abstracts
112 out the general patterns of these functions and implementing those patterns.
113 In particular, the package provides generic mapper/redducer/combiner classes,
114 and a set of built-in value aggregators, and a generic utility class that
115 helps user create map/reduce jobs using the generic class. The built-in
116 aggregators include:
117 
118 sum over numeric values count the number of distinct values compute the
119 histogram of values compute the minimum, maximum, media,average, standard
120 deviation of numeric values
121 
122 The developer using Aggregate will need only to provide a plugin class
123 conforming to the following interface:
124 
125 public interface ValueAggregatorDescriptor { public ArrayList<Entry>
126 generateKeyValPairs(Object key, Object value); public void
127 configure(JobConfjob); }
128 
129 The package also provides a base class, ValueAggregatorBaseDescriptor,
130 implementing the above interface. The user can extend the base class and
131 implement generateKeyValPairs accordingly.
132 
133 The primary work of generateKeyValPairs is to emit one or more key/value
134 pairs based on the input key/value pair. The key in an output key/value pair
135 encode two pieces of information: aggregation type and aggregation id. The
136 value will be aggregated onto the aggregation id according the aggregation
137 type.
138 
139 This class offers a function to generate a map/reduce job using Aggregate
140 framework. The function takes the following parameters: input directory spec
141 input format (text or sequence file) output directory a file specifying the
142 user plugin class
143<P>
144
145<P>
146<HR>
147
148<P>
149
150<!-- ======== CONSTRUCTOR SUMMARY ======== -->
151
152<A NAME="constructor_summary"><!-- --></A>
153<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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155<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
156<B>Constructor Summary</B></FONT></TH>
157</TR>
158<TR BGCOLOR="white" CLASS="TableRowColor">
159<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#ValueAggregatorJob()">ValueAggregatorJob</A></B>()</CODE>
160
161<BR>
162&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
163</TR>
164</TABLE>
165&nbsp;
166<!-- ========== METHOD SUMMARY =========== -->
167
168<A NAME="method_summary"><!-- --></A>
169<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
170<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
171<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
172<B>Method Summary</B></FONT></TH>
173</TR>
174<TR BGCOLOR="white" CLASS="TableRowColor">
175<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
176<CODE>static&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A></CODE></FONT></TD>
177<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJob(java.lang.String[])">createValueAggregatorJob</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>
178
179<BR>
180&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create an Aggregate based map/reduce job.</TD>
181</TR>
182<TR BGCOLOR="white" CLASS="TableRowColor">
183<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
184<CODE>static&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A></CODE></FONT></TD>
185<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJob(java.lang.String[], java.lang.Class[])">createValueAggregatorJob</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,
186                         <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/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)</CODE>
187
188<BR>
189&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
190</TR>
191<TR BGCOLOR="white" CLASS="TableRowColor">
192<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
193<CODE>static&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</A></CODE></FONT></TD>
194<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJobs(java.lang.String[])">createValueAggregatorJobs</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>
195
196<BR>
197&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
198</TR>
199<TR BGCOLOR="white" CLASS="TableRowColor">
200<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
201<CODE>static&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</A></CODE></FONT></TD>
202<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJobs(java.lang.String[], java.lang.Class[])">createValueAggregatorJobs</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,
203                          <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/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)</CODE>
204
205<BR>
206&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
207</TR>
208<TR BGCOLOR="white" CLASS="TableRowColor">
209<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
210<CODE>static&nbsp;void</CODE></FONT></TD>
211<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.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>
212
213<BR>
214&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;create and run an Aggregate based map/reduce job.</TD>
215</TR>
216<TR BGCOLOR="white" CLASS="TableRowColor">
217<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
218<CODE>static&nbsp;void</CODE></FONT></TD>
219<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#setAggregatorDescriptors(org.apache.hadoop.mapred.JobConf, java.lang.Class[])">setAggregatorDescriptors</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
220                         <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/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)</CODE>
221
222<BR>
223&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
224</TR>
225</TABLE>
226&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
227<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
228<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
229<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>
230</TR>
231<TR BGCOLOR="white" CLASS="TableRowColor">
232<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>
233</TR>
234</TABLE>
235&nbsp;
236<P>
237
238<!-- ========= CONSTRUCTOR DETAIL ======== -->
239
240<A NAME="constructor_detail"><!-- --></A>
241<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
242<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
243<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
244<B>Constructor Detail</B></FONT></TH>
245</TR>
246</TABLE>
247
248<A NAME="ValueAggregatorJob()"><!-- --></A><H3>
249ValueAggregatorJob</H3>
250<PRE>
251public <B>ValueAggregatorJob</B>()</PRE>
252<DL>
253</DL>
254
255<!-- ============ METHOD DETAIL ========== -->
256
257<A NAME="method_detail"><!-- --></A>
258<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
259<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
260<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
261<B>Method Detail</B></FONT></TH>
262</TR>
263</TABLE>
264
265<A NAME="createValueAggregatorJobs(java.lang.String[], java.lang.Class[])"><!-- --></A><H3>
266createValueAggregatorJobs</H3>
267<PRE>
268public static <A HREF="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</A> <B>createValueAggregatorJobs</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,
269                                                   <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/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)
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><DL>
273
274<DT><B>Throws:</B>
275<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>
276</DD>
277</DL>
278<HR>
279
280<A NAME="createValueAggregatorJobs(java.lang.String[])"><!-- --></A><H3>
281createValueAggregatorJobs</H3>
282<PRE>
283public static <A HREF="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</A> <B>createValueAggregatorJobs</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)
284                                            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>
285<DL>
286<DD><DL>
287
288<DT><B>Throws:</B>
289<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>
290</DD>
291</DL>
292<HR>
293
294<A NAME="createValueAggregatorJob(java.lang.String[])"><!-- --></A><H3>
295createValueAggregatorJob</H3>
296<PRE>
297public static <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> <B>createValueAggregatorJob</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)
298                                        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>
299<DL>
300<DD>Create an Aggregate based map/reduce job.
301<P>
302<DD><DL>
303<DT><B>Parameters:</B><DD><CODE>args</CODE> - the arguments used for job creation. Generic hadoop
304 arguments are accepted.
305<DT><B>Returns:</B><DD>a JobConf object ready for submission.
306<DT><B>Throws:</B>
307<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><DT><B>See Also:</B><DD><A HREF="../../../../../../org/apache/hadoop/util/GenericOptionsParser.html" title="class in org.apache.hadoop.util"><CODE>GenericOptionsParser</CODE></A></DL>
308</DD>
309</DL>
310<HR>
311
312<A NAME="createValueAggregatorJob(java.lang.String[], java.lang.Class[])"><!-- --></A><H3>
313createValueAggregatorJob</H3>
314<PRE>
315public static <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> <B>createValueAggregatorJob</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,
316                                               <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/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)
317                                        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>
318<DL>
319<DD><DL>
320
321<DT><B>Throws:</B>
322<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>
323</DD>
324</DL>
325<HR>
326
327<A NAME="setAggregatorDescriptors(org.apache.hadoop.mapred.JobConf, java.lang.Class[])"><!-- --></A><H3>
328setAggregatorDescriptors</H3>
329<PRE>
330public static void <B>setAggregatorDescriptors</B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
331                                            <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/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)</PRE>
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340main</H3>
341<PRE>
342public 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;args)
343                 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>
344<DL>
345<DD>create and run an Aggregate based map/reduce job.
346<P>
347<DD><DL>
348<DT><B>Parameters:</B><DD><CODE>args</CODE> - the arguments used for job creation
349<DT><B>Throws:</B>
350<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>
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