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7ValueHistogram (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapred.lib.aggregate</FONT>
92<BR>
93Class ValueHistogram</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.ValueHistogram</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>ValueHistogram</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/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></DL>
104</PRE>
105
106<P>
107This class implements a value aggregator that computes the
108 histogram of a sequence of strings.
109<P>
110
111<P>
112<HR>
113
114<P>
115
116<!-- ======== CONSTRUCTOR SUMMARY ======== -->
117
118<A NAME="constructor_summary"><!-- --></A>
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120<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
121<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
122<B>Constructor Summary</B></FONT></TH>
123</TR>
124<TR BGCOLOR="white" CLASS="TableRowColor">
125<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueHistogram.html#ValueHistogram()">ValueHistogram</A></B>()</CODE>
126
127<BR>
128&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
129</TR>
130</TABLE>
131&nbsp;
132<!-- ========== METHOD SUMMARY =========== -->
133
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137<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
138<B>Method Summary</B></FONT></TH>
139</TR>
140<TR BGCOLOR="white" CLASS="TableRowColor">
141<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
142<CODE>&nbsp;void</CODE></FONT></TD>
143<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueHistogram.html#addNextValue(java.lang.Object)">addNextValue</A></B>(<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>&nbsp;val)</CODE>
144
145<BR>
146&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;add the given val to the aggregator.</TD>
147</TR>
148<TR BGCOLOR="white" CLASS="TableRowColor">
149<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
150<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</A></CODE></FONT></TD>
151<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueHistogram.html#getCombinerOutput()">getCombinerOutput</A></B>()</CODE>
152
153<BR>
154&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
155</TR>
156<TR BGCOLOR="white" CLASS="TableRowColor">
157<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
158<CODE>&nbsp;<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></CODE></FONT></TD>
159<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueHistogram.html#getReport()">getReport</A></B>()</CODE>
160
161<BR>
162&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
163</TR>
164<TR BGCOLOR="white" CLASS="TableRowColor">
165<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
166<CODE>&nbsp;<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></CODE></FONT></TD>
167<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueHistogram.html#getReportDetails()">getReportDetails</A></B>()</CODE>
168
169<BR>
170&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
171</TR>
172<TR BGCOLOR="white" CLASS="TableRowColor">
173<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
174<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/TreeMap.html?is-external=true" title="class or interface in java.util">TreeMap</A></CODE></FONT></TD>
175<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueHistogram.html#getReportItems()">getReportItems</A></B>()</CODE>
176
177<BR>
178&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
179</TR>
180<TR BGCOLOR="white" CLASS="TableRowColor">
181<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
182<CODE>&nbsp;void</CODE></FONT></TD>
183<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueHistogram.html#reset()">reset</A></B>()</CODE>
184
185<BR>
186&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;reset the aggregator</TD>
187</TR>
188</TABLE>
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196</TR>
197</TABLE>
198&nbsp;
199<P>
200
201<!-- ========= CONSTRUCTOR DETAIL ======== -->
202
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204<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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206<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
207<B>Constructor Detail</B></FONT></TH>
208</TR>
209</TABLE>
210
211<A NAME="ValueHistogram()"><!-- --></A><H3>
212ValueHistogram</H3>
213<PRE>
214public <B>ValueHistogram</B>()</PRE>
215<DL>
216</DL>
217
218<!-- ============ METHOD DETAIL ========== -->
219
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224<B>Method Detail</B></FONT></TH>
225</TR>
226</TABLE>
227
228<A NAME="addNextValue(java.lang.Object)"><!-- --></A><H3>
229addNextValue</H3>
230<PRE>
231public void <B>addNextValue</B>(<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>&nbsp;val)</PRE>
232<DL>
233<DD>add the given val to the aggregator.
234<P>
235<DD><DL>
236<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html#addNextValue(java.lang.Object)">addNextValue</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></CODE></DL>
237</DD>
238<DD><DL>
239<DT><B>Parameters:</B><DD><CODE>val</CODE> - the value to be added. It is expected to be a string
240 in the form of xxxx\tnum, meaning xxxx has num occurrences.</DL>
241</DD>
242</DL>
243<HR>
244
245<A NAME="getReport()"><!-- --></A><H3>
246getReport</H3>
247<PRE>
248public <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> <B>getReport</B>()</PRE>
249<DL>
250<DD><DL>
251<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html#getReport()">getReport</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></CODE></DL>
252</DD>
253<DD><DL>
254
255<DT><B>Returns:</B><DD>the string representation of this aggregator.
256 It includes the following basic statistics of the histogram:
257    the number of unique values
258    the minimum value
259    the media value
260    the maximum value
261    the average value
262    the standard deviation</DL>
263</DD>
264</DL>
265<HR>
266
267<A NAME="getReportDetails()"><!-- --></A><H3>
268getReportDetails</H3>
269<PRE>
270public <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> <B>getReportDetails</B>()</PRE>
271<DL>
272<DD><DL>
273</DL>
274</DD>
275<DD><DL>
276
277<DT><B>Returns:</B><DD>a string representation of the list of value/frequence pairs of
278 the histogram</DL>
279</DD>
280</DL>
281<HR>
282
283<A NAME="getCombinerOutput()"><!-- --></A><H3>
284getCombinerOutput</H3>
285<PRE>
286public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</A> <B>getCombinerOutput</B>()</PRE>
287<DL>
288<DD><DL>
289<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html#getCombinerOutput()">getCombinerOutput</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></CODE></DL>
290</DD>
291<DD><DL>
292
293<DT><B>Returns:</B><DD>a list value/frequence pairs.
294  The return value is expected to be used by the reducer.</DL>
295</DD>
296</DL>
297<HR>
298
299<A NAME="getReportItems()"><!-- --></A><H3>
300getReportItems</H3>
301<PRE>
302public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/TreeMap.html?is-external=true" title="class or interface in java.util">TreeMap</A> <B>getReportItems</B>()</PRE>
303<DL>
304<DD><DL>
305</DL>
306</DD>
307<DD><DL>
308
309<DT><B>Returns:</B><DD>a TreeMap representation of the histogram</DL>
310</DD>
311</DL>
312<HR>
313
314<A NAME="reset()"><!-- --></A><H3>
315reset</H3>
316<PRE>
317public void <B>reset</B>()</PRE>
318<DL>
319<DD>reset the aggregator
320<P>
321<DD><DL>
322<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html#reset()">reset</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></CODE></DL>
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