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7DataJoinReducerBase (Hadoop 0.20.1 API)
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79  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&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.contrib.utils.join</FONT>
92<BR>
93Class DataJoinReducerBase</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/contrib/utils/join/JobBase.html" title="class in org.apache.hadoop.contrib.utils.join">org.apache.hadoop.contrib.utils.join.JobBase</A>
97      <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.contrib.utils.join.DataJoinReducerBase</B>
98</PRE>
99<DL>
100<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A>, <A HREF="../../../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</A>, <A HREF="../../../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper</A>, <A HREF="../../../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</A></DD>
101</DL>
102<HR>
103<DL>
104<DT><PRE>public abstract class <B>DataJoinReducerBase</B><DT>extends <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html" title="class in org.apache.hadoop.contrib.utils.join">JobBase</A></DL>
105</PRE>
106
107<P>
108This abstract class serves as the base class for the reducer class of a data
109 join job. The reduce function will first group the values according to their
110 input tags, and then compute the cross product of over the groups. For each
111 tuple in the cross product, it calls the following method, which is expected
112 to be implemented in a subclass.
113 
114 protected abstract TaggedMapOutput combine(Object[] tags, Object[] values);
115 
116 The above method is expected to produce one output value from an array of
117 records of different sources. The user code can also perform filtering here.
118 It can return null if it decides to the records do not meet certain
119 conditions.
120<P>
121
122<P>
123<HR>
124
125<P>
126<!-- =========== FIELD SUMMARY =========== -->
127
128<A NAME="field_summary"><!-- --></A>
129<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
130<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
131<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
132<B>Field Summary</B></FONT></TH>
133</TR>
134<TR BGCOLOR="white" CLASS="TableRowColor">
135<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
136<CODE>protected &nbsp;long</CODE></FONT></TD>
137<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#collected">collected</A></B></CODE>
138
139<BR>
140&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
141</TR>
142<TR BGCOLOR="white" CLASS="TableRowColor">
143<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
144<CODE>protected &nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A></CODE></FONT></TD>
145<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#job">job</A></B></CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
152<CODE>protected &nbsp;long</CODE></FONT></TD>
153<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#largestNumOfValues">largestNumOfValues</A></B></CODE>
154
155<BR>
156&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
157</TR>
158<TR BGCOLOR="white" CLASS="TableRowColor">
159<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
160<CODE>static&nbsp;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A></CODE></FONT></TD>
161<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#NUM_OF_VALUES_FIELD">NUM_OF_VALUES_FIELD</A></B></CODE>
162
163<BR>
164&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
165</TR>
166<TR BGCOLOR="white" CLASS="TableRowColor">
167<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
168<CODE>protected &nbsp;long</CODE></FONT></TD>
169<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#numOfValues">numOfValues</A></B></CODE>
170
171<BR>
172&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
173</TR>
174<TR BGCOLOR="white" CLASS="TableRowColor">
175<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
176<CODE>protected &nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A></CODE></FONT></TD>
177<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#reporter">reporter</A></B></CODE>
178
179<BR>
180&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</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/io/Text.html" title="class in org.apache.hadoop.io">Text</A></CODE></FONT></TD>
185<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#SOURCE_TAGS_FIELD">SOURCE_TAGS_FIELD</A></B></CODE>
186
187<BR>
188&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
189</TR>
190</TABLE>
191&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.contrib.utils.join.JobBase"><!-- --></A>
192<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
193<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
194<TH ALIGN="left"><B>Fields inherited from class org.apache.hadoop.contrib.utils.join.<A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html" title="class in org.apache.hadoop.contrib.utils.join">JobBase</A></B></TH>
195</TR>
196<TR BGCOLOR="white" CLASS="TableRowColor">
197<TD><CODE><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#LOG">LOG</A></CODE></TD>
198</TR>
199</TABLE>
200&nbsp;
201<!-- ======== CONSTRUCTOR SUMMARY ======== -->
202
203<A NAME="constructor_summary"><!-- --></A>
204<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
205<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
206<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
207<B>Constructor Summary</B></FONT></TH>
208</TR>
209<TR BGCOLOR="white" CLASS="TableRowColor">
210<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#DataJoinReducerBase()">DataJoinReducerBase</A></B>()</CODE>
211
212<BR>
213&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
214</TR>
215</TABLE>
216&nbsp;
217<!-- ========== METHOD SUMMARY =========== -->
218
219<A NAME="method_summary"><!-- --></A>
220<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
221<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
222<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
223<B>Method Summary</B></FONT></TH>
224</TR>
225<TR BGCOLOR="white" CLASS="TableRowColor">
226<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
227<CODE>&nbsp;void</CODE></FONT></TD>
228<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#close()">close</A></B>()</CODE>
229
230<BR>
231&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
232</TR>
233<TR BGCOLOR="white" CLASS="TableRowColor">
234<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
235<CODE>protected &nbsp;void</CODE></FONT></TD>
236<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#collect(java.lang.Object, org.apache.hadoop.contrib.utils.join.TaggedMapOutput, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">collect</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;key,
237        <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/TaggedMapOutput.html" title="class in org.apache.hadoop.contrib.utils.join">TaggedMapOutput</A>&nbsp;aRecord,
238        <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&nbsp;output,
239        <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
240
241<BR>
242&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The subclass can overwrite this method to perform additional filtering
243 and/or other processing logic before a value is collected.</TD>
244</TR>
245<TR BGCOLOR="white" CLASS="TableRowColor">
246<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
247<CODE>protected abstract &nbsp;<A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/TaggedMapOutput.html" title="class in org.apache.hadoop.contrib.utils.join">TaggedMapOutput</A></CODE></FONT></TD>
248<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#combine(java.lang.Object[], java.lang.Object[])">combine</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;tags,
249        <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;values)</CODE>
250
251<BR>
252&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
253</TR>
254<TR BGCOLOR="white" CLASS="TableRowColor">
255<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
256<CODE>&nbsp;void</CODE></FONT></TD>
257<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</CODE>
258
259<BR>
260&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initializes a new instance from a <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><CODE>JobConf</CODE></A>.</TD>
261</TR>
262<TR BGCOLOR="white" CLASS="TableRowColor">
263<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
264<CODE>protected &nbsp;<A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/ResetableIterator.html" title="interface in org.apache.hadoop.contrib.utils.join">ResetableIterator</A></CODE></FONT></TD>
265<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#createResetableIterator()">createResetableIterator</A></B>()</CODE>
266
267<BR>
268&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The subclass can provide a different implementation on ResetableIterator.</TD>
269</TR>
270<TR BGCOLOR="white" CLASS="TableRowColor">
271<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
272<CODE>&nbsp;void</CODE></FONT></TD>
273<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#map(java.lang.Object, java.lang.Object, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">map</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;arg0,
274    <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;arg1,
275    <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&nbsp;arg2,
276    <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;arg3)</CODE>
277
278<BR>
279&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Maps a single input key/value pair into an intermediate key/value pair.</TD>
280</TR>
281<TR BGCOLOR="white" CLASS="TableRowColor">
282<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
283<CODE>&nbsp;void</CODE></FONT></TD>
284<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/DataJoinReducerBase.html#reduce(java.lang.Object, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">reduce</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;key,
285       <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A>&nbsp;values,
286       <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&nbsp;output,
287       <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
288
289<BR>
290&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<i>Reduces</i> values for a given key.</TD>
291</TR>
292</TABLE>
293&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.contrib.utils.join.JobBase"><!-- --></A>
294<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
295<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
296<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.contrib.utils.join.<A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html" title="class in org.apache.hadoop.contrib.utils.join">JobBase</A></B></TH>
297</TR>
298<TR BGCOLOR="white" CLASS="TableRowColor">
299<TD><CODE><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#addDoubleValue(java.lang.Object, double)">addDoubleValue</A>, <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#addLongValue(java.lang.Object, long)">addLongValue</A>, <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#getDoubleValue(java.lang.Object)">getDoubleValue</A>, <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#getLongValue(java.lang.Object)">getLongValue</A>, <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#getReport()">getReport</A>, <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#report()">report</A>, <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#setDoubleValue(java.lang.Object, double)">setDoubleValue</A>, <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#setLongValue(java.lang.Object, long)">setLongValue</A></CODE></TD>
300</TR>
301</TABLE>
302&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
303<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
304<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
305<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>
306</TR>
307<TR BGCOLOR="white" CLASS="TableRowColor">
308<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>
309</TR>
310</TABLE>
311&nbsp;
312<P>
313
314<!-- ============ FIELD DETAIL =========== -->
315
316<A NAME="field_detail"><!-- --></A>
317<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
318<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
319<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
320<B>Field Detail</B></FONT></TH>
321</TR>
322</TABLE>
323
324<A NAME="reporter"><!-- --></A><H3>
325reporter</H3>
326<PRE>
327protected <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A> <B>reporter</B></PRE>
328<DL>
329<DL>
330</DL>
331</DL>
332<HR>
333
334<A NAME="largestNumOfValues"><!-- --></A><H3>
335largestNumOfValues</H3>
336<PRE>
337protected long <B>largestNumOfValues</B></PRE>
338<DL>
339<DL>
340</DL>
341</DL>
342<HR>
343
344<A NAME="numOfValues"><!-- --></A><H3>
345numOfValues</H3>
346<PRE>
347protected long <B>numOfValues</B></PRE>
348<DL>
349<DL>
350</DL>
351</DL>
352<HR>
353
354<A NAME="collected"><!-- --></A><H3>
355collected</H3>
356<PRE>
357protected long <B>collected</B></PRE>
358<DL>
359<DL>
360</DL>
361</DL>
362<HR>
363
364<A NAME="job"><!-- --></A><H3>
365job</H3>
366<PRE>
367protected <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> <B>job</B></PRE>
368<DL>
369<DL>
370</DL>
371</DL>
372<HR>
373
374<A NAME="SOURCE_TAGS_FIELD"><!-- --></A><H3>
375SOURCE_TAGS_FIELD</H3>
376<PRE>
377public static <A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A> <B>SOURCE_TAGS_FIELD</B></PRE>
378<DL>
379<DL>
380</DL>
381</DL>
382<HR>
383
384<A NAME="NUM_OF_VALUES_FIELD"><!-- --></A><H3>
385NUM_OF_VALUES_FIELD</H3>
386<PRE>
387public static <A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A> <B>NUM_OF_VALUES_FIELD</B></PRE>
388<DL>
389<DL>
390</DL>
391</DL>
392
393<!-- ========= CONSTRUCTOR DETAIL ======== -->
394
395<A NAME="constructor_detail"><!-- --></A>
396<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
397<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
398<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
399<B>Constructor Detail</B></FONT></TH>
400</TR>
401</TABLE>
402
403<A NAME="DataJoinReducerBase()"><!-- --></A><H3>
404DataJoinReducerBase</H3>
405<PRE>
406public <B>DataJoinReducerBase</B>()</PRE>
407<DL>
408</DL>
409
410<!-- ============ METHOD DETAIL ========== -->
411
412<A NAME="method_detail"><!-- --></A>
413<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
414<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
415<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
416<B>Method Detail</B></FONT></TH>
417</TR>
418</TABLE>
419
420<A NAME="close()"><!-- --></A><H3>
421close</H3>
422<PRE>
423public void <B>close</B>()
424           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>
425<DL>
426<DD><DL>
427
428<DT><B>Throws:</B>
429<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>
430</DD>
431</DL>
432<HR>
433
434<A NAME="configure(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
435configure</H3>
436<PRE>
437public void <B>configure</B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
438<DL>
439<DD><B>Description copied from class: <CODE><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#configure(org.apache.hadoop.mapred.JobConf)">JobBase</A></CODE></B></DD>
440<DD>Initializes a new instance from a <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><CODE>JobConf</CODE></A>.
441<P>
442<DD><DL>
443<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/JobConfigurable.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></CODE> in class <CODE><A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/JobBase.html" title="class in org.apache.hadoop.contrib.utils.join">JobBase</A></CODE></DL>
444</DD>
445<DD><DL>
446<DT><B>Parameters:</B><DD><CODE>job</CODE> - the configuration</DL>
447</DD>
448</DL>
449<HR>
450
451<A NAME="createResetableIterator()"><!-- --></A><H3>
452createResetableIterator</H3>
453<PRE>
454protected <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/ResetableIterator.html" title="interface in org.apache.hadoop.contrib.utils.join">ResetableIterator</A> <B>createResetableIterator</B>()</PRE>
455<DL>
456<DD>The subclass can provide a different implementation on ResetableIterator.
457 This is necessary if the number of values in a reduce call is very high.
458 
459 The default provided here uses ArrayListBackedIterator
460<P>
461<DD><DL>
462
463<DT><B>Returns:</B><DD>an Object of ResetableIterator.</DL>
464</DD>
465</DL>
466<HR>
467
468<A NAME="reduce(java.lang.Object, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
469reduce</H3>
470<PRE>
471public void <B>reduce</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;key,
472                   <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A>&nbsp;values,
473                   <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&nbsp;output,
474                   <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
475            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>
476<DL>
477<DD><B>Description copied from interface: <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/Reducer.html#reduce(K2, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">Reducer</A></CODE></B></DD>
478<DD><i>Reduces</i> values for a given key. 
479 
480 <p>The framework calls this method for each
481 <code>&lt;key, (list of values)></code> pair in the grouped inputs.
482 Output values must be of the same type as input values.  Input keys must
483 not be altered. The framework will <b>reuse</b> the key and value objects
484 that are passed into the reduce, therefore the application should clone
485 the objects they want to keep a copy of. In many cases, all values are
486 combined into zero or one value.
487 </p>
488   
489 <p>Output pairs are collected with calls to 
490 <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html#collect(K, V)"><CODE>OutputCollector.collect(Object,Object)</CODE></A>.</p>
491
492 <p>Applications can use the <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred"><CODE>Reporter</CODE></A> provided to report progress
493 or just indicate that they are alive. In scenarios where the application
494 takes an insignificant amount of time to process individual key/value
495 pairs, this is crucial since the framework might assume that the task has
496 timed-out and kill that task. The other way of avoiding this is to set
497 <a href="../../../../../../../mapred-default.html#mapred.task.timeout">
498 mapred.task.timeout</a> to a high-enough value (or even zero for no
499 time-outs).</p>
500<P>
501<DD><DL>
502<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key.<DD><CODE>values</CODE> - the list of values to reduce.<DD><CODE>output</CODE> - to collect keys and combined values.<DD><CODE>reporter</CODE> - facility to report progress.
503<DT><B>Throws:</B>
504<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>
505</DD>
506</DL>
507<HR>
508
509<A NAME="collect(java.lang.Object, org.apache.hadoop.contrib.utils.join.TaggedMapOutput, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
510collect</H3>
511<PRE>
512protected void <B>collect</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;key,
513                       <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/TaggedMapOutput.html" title="class in org.apache.hadoop.contrib.utils.join">TaggedMapOutput</A>&nbsp;aRecord,
514                       <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&nbsp;output,
515                       <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
516                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>
517<DL>
518<DD>The subclass can overwrite this method to perform additional filtering
519 and/or other processing logic before a value is collected.
520<P>
521<DD><DL>
522<DT><B>Parameters:</B><DD><CODE>key</CODE> - <DD><CODE>aRecord</CODE> - <DD><CODE>output</CODE> - <DD><CODE>reporter</CODE> -
523<DT><B>Throws:</B>
524<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>
525</DD>
526</DL>
527<HR>
528
529<A NAME="combine(java.lang.Object[], java.lang.Object[])"><!-- --></A><H3>
530combine</H3>
531<PRE>
532protected abstract <A HREF="../../../../../../org/apache/hadoop/contrib/utils/join/TaggedMapOutput.html" title="class in org.apache.hadoop.contrib.utils.join">TaggedMapOutput</A> <B>combine</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;tags,
533                                           <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;values)</PRE>
534<DL>
535<DD><DL>
536<DT><B>Parameters:</B><DD><CODE>tags</CODE> - a list of source tags<DD><CODE>values</CODE> - a value per source
537<DT><B>Returns:</B><DD>combined value derived from values of the sources</DL>
538</DD>
539</DL>
540<HR>
541
542<A NAME="map(java.lang.Object, java.lang.Object, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
543map</H3>
544<PRE>
545public void <B>map</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;arg0,
546                <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;arg1,
547                <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&nbsp;arg2,
548                <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;arg3)
549         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>
550<DL>
551<DD><B>Description copied from interface: <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/Mapper.html#map(K1, V1, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">Mapper</A></CODE></B></DD>
552<DD>Maps a single input key/value pair into an intermediate key/value pair.
553 
554 <p>Output pairs need not be of the same types as input pairs.  A given
555 input pair may map to zero or many output pairs.  Output pairs are
556 collected with calls to
557 <A HREF="../../../../../../org/apache/hadoop/mapred/OutputCollector.html#collect(K, V)"><CODE>OutputCollector.collect(Object,Object)</CODE></A>.</p>
558
559 <p>Applications can use the <A HREF="../../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred"><CODE>Reporter</CODE></A> provided to report progress
560 or just indicate that they are alive. In scenarios where the application
561 takes an insignificant amount of time to process individual key/value
562 pairs, this is crucial since the framework might assume that the task has
563 timed-out and kill that task. The other way of avoiding this is to set
564 <a href="../../../../../../../mapred-default.html#mapred.task.timeout">
565 mapred.task.timeout</a> to a high-enough value (or even zero for no
566 time-outs).</p>
567<P>
568<DD><DL>
569<DT><B>Parameters:</B><DD><CODE>arg0</CODE> - the input key.<DD><CODE>arg1</CODE> - the input value.<DD><CODE>arg2</CODE> - collects mapped keys and values.<DD><CODE>arg3</CODE> - facility to report progress.
570<DT><B>Throws:</B>
571<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>
572</DD>
573</DL>
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