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7MultipleOutputs (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapred.lib</FONT>
92<BR>
93Class MultipleOutputs</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.MultipleOutputs</B>
97</PRE>
98<HR>
99<DL>
100<DT><PRE>public class <B>MultipleOutputs</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>
104The MultipleOutputs class simplifies writting to additional outputs other
105 than the job default output via the <code>OutputCollector</code> passed to
106 the <code>map()</code> and <code>reduce()</code> methods of the
107 <code>Mapper</code> and <code>Reducer</code> implementations.
108 <p/>
109 Each additional output, or named output, may be configured with its own
110 <code>OutputFormat</code>, with its own key class and with its own value
111 class.
112 <p/>
113 A named output can be a single file or a multi file. The later is refered as
114 a multi named output.
115 <p/>
116 A multi named output is an unbound set of files all sharing the same
117 <code>OutputFormat</code>, key class and value class configuration.
118 <p/>
119 When named outputs are used within a <code>Mapper</code> implementation,
120 key/values written to a name output are not part of the reduce phase, only
121 key/values written to the job <code>OutputCollector</code> are part of the
122 reduce phase.
123 <p/>
124 MultipleOutputs supports counters, by default the are disabled. The counters
125 group is the <A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html" title="class in org.apache.hadoop.mapred.lib"><CODE>MultipleOutputs</CODE></A> class name.
126 </p>
127 The names of the counters are the same as the named outputs. For multi
128 named outputs the name of the counter is the concatenation of the named
129 output, and underscore '_' and the multiname.
130 <p/>
131 Job configuration usage pattern is:
132 <pre>
133
134 JobConf conf = new JobConf();
135
136 conf.setInputPath(inDir);
137 FileOutputFormat.setOutputPath(conf, outDir);
138
139 conf.setMapperClass(MOMap.class);
140 conf.setReducerClass(MOReduce.class);
141 ...
142
143 // Defines additional single text based output 'text' for the job
144 MultipleOutputs.addNamedOutput(conf, "text", TextOutputFormat.class,
145 LongWritable.class, Text.class);
146
147 // Defines additional multi sequencefile based output 'sequence' for the
148 // job
149 MultipleOutputs.addMultiNamedOutput(conf, "seq",
150   SequenceFileOutputFormat.class,
151   LongWritable.class, Text.class);
152 ...
153
154 JobClient jc = new JobClient();
155 RunningJob job = jc.submitJob(conf);
156
157 ...
158 </pre>
159 <p/>
160 Job configuration usage pattern is:
161 <pre>
162
163 public class MOReduce implements
164   Reducer&lt;WritableComparable, Writable&gt; {
165 private MultipleOutputs mos;
166
167 public void configure(JobConf conf) {
168 ...
169 mos = new MultipleOutputs(conf);
170 }
171
172 public void reduce(WritableComparable key, Iterator&lt;Writable&gt; values,
173 OutputCollector output, Reporter reporter)
174 throws IOException {
175 ...
176 mos.getCollector("text", reporter).collect(key, new Text("Hello"));
177 mos.getCollector("seq", "A", reporter).collect(key, new Text("Bye"));
178 mos.getCollector("seq", "B", reporter).collect(key, new Text("Chau"));
179 ...
180 }
181
182 public void close() throws IOException {
183 mos.close();
184 ...
185 }
186
187 }
188 </pre>
189<P>
190
191<P>
192<HR>
193
194<P>
195
196<!-- ======== CONSTRUCTOR SUMMARY ======== -->
197
198<A NAME="constructor_summary"><!-- --></A>
199<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
200<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
201<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
202<B>Constructor Summary</B></FONT></TH>
203</TR>
204<TR BGCOLOR="white" CLASS="TableRowColor">
205<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#MultipleOutputs(org.apache.hadoop.mapred.JobConf)">MultipleOutputs</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</CODE>
206
207<BR>
208&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates and initializes multiple named outputs support, it should be
209 instantiated in the Mapper/Reducer configure method.</TD>
210</TR>
211</TABLE>
212&nbsp;
213<!-- ========== METHOD SUMMARY =========== -->
214
215<A NAME="method_summary"><!-- --></A>
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218<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
219<B>Method Summary</B></FONT></TH>
220</TR>
221<TR BGCOLOR="white" CLASS="TableRowColor">
222<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
223<CODE>static&nbsp;void</CODE></FONT></TD>
224<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#addMultiNamedOutput(org.apache.hadoop.mapred.JobConf, java.lang.String, java.lang.Class, java.lang.Class, java.lang.Class)">addMultiNamedOutput</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
225                    <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;namedOutput,
226                    <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/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</A>&gt;&nbsp;outputFormatClass,
227                    <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;?&gt;&nbsp;keyClass,
228                    <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;?&gt;&nbsp;valueClass)</CODE>
229
230<BR>
231&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Adds a multi named output for the job.</TD>
232</TR>
233<TR BGCOLOR="white" CLASS="TableRowColor">
234<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
235<CODE>static&nbsp;void</CODE></FONT></TD>
236<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#addNamedOutput(org.apache.hadoop.mapred.JobConf, java.lang.String, java.lang.Class, java.lang.Class, java.lang.Class)">addNamedOutput</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
237               <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;namedOutput,
238               <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/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</A>&gt;&nbsp;outputFormatClass,
239               <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;?&gt;&nbsp;keyClass,
240               <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;?&gt;&nbsp;valueClass)</CODE>
241
242<BR>
243&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Adds a named output for the job.</TD>
244</TR>
245<TR BGCOLOR="white" CLASS="TableRowColor">
246<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
247<CODE>&nbsp;void</CODE></FONT></TD>
248<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#close()">close</A></B>()</CODE>
249
250<BR>
251&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Closes all the opened named outputs.</TD>
252</TR>
253<TR BGCOLOR="white" CLASS="TableRowColor">
254<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
255<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A></CODE></FONT></TD>
256<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#getCollector(java.lang.String, org.apache.hadoop.mapred.Reporter)">getCollector</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;namedOutput,
257             <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
258
259<BR>
260&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets the output collector for a named output.</TD>
261</TR>
262<TR BGCOLOR="white" CLASS="TableRowColor">
263<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
264<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A></CODE></FONT></TD>
265<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#getCollector(java.lang.String, java.lang.String, org.apache.hadoop.mapred.Reporter)">getCollector</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;namedOutput,
266             <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;multiName,
267             <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
268
269<BR>
270&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets the output collector for a multi named output.</TD>
271</TR>
272<TR BGCOLOR="white" CLASS="TableRowColor">
273<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
274<CODE>static&nbsp;boolean</CODE></FONT></TD>
275<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#getCountersEnabled(org.apache.hadoop.mapred.JobConf)">getCountersEnabled</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf)</CODE>
276
277<BR>
278&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns if the counters for the named outputs are enabled or not.</TD>
279</TR>
280<TR BGCOLOR="white" CLASS="TableRowColor">
281<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
282<CODE>static&nbsp;<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/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</A>&gt;</CODE></FONT></TD>
283<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#getNamedOutputFormatClass(org.apache.hadoop.mapred.JobConf, java.lang.String)">getNamedOutputFormatClass</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
284                          <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;namedOutput)</CODE>
285
286<BR>
287&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the named output OutputFormat.</TD>
288</TR>
289<TR BGCOLOR="white" CLASS="TableRowColor">
290<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
291<CODE>static&nbsp;<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/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&gt;</CODE></FONT></TD>
292<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#getNamedOutputKeyClass(org.apache.hadoop.mapred.JobConf, java.lang.String)">getNamedOutputKeyClass</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
293                       <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;namedOutput)</CODE>
294
295<BR>
296&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the key class for a named output.</TD>
297</TR>
298<TR BGCOLOR="white" CLASS="TableRowColor">
299<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
300<CODE>&nbsp;<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>&lt;<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>&gt;</CODE></FONT></TD>
301<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#getNamedOutputs()">getNamedOutputs</A></B>()</CODE>
302
303<BR>
304&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns iterator with the defined name outputs.</TD>
305</TR>
306<TR BGCOLOR="white" CLASS="TableRowColor">
307<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
308<CODE>static&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<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>&gt;</CODE></FONT></TD>
309<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#getNamedOutputsList(org.apache.hadoop.mapred.JobConf)">getNamedOutputsList</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf)</CODE>
310
311<BR>
312&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns list of channel names.</TD>
313</TR>
314<TR BGCOLOR="white" CLASS="TableRowColor">
315<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
316<CODE>static&nbsp;<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/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;</CODE></FONT></TD>
317<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#getNamedOutputValueClass(org.apache.hadoop.mapred.JobConf, java.lang.String)">getNamedOutputValueClass</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
318                         <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;namedOutput)</CODE>
319
320<BR>
321&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the value class for a named output.</TD>
322</TR>
323<TR BGCOLOR="white" CLASS="TableRowColor">
324<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
325<CODE>static&nbsp;boolean</CODE></FONT></TD>
326<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#isMultiNamedOutput(org.apache.hadoop.mapred.JobConf, java.lang.String)">isMultiNamedOutput</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
327                   <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;namedOutput)</CODE>
328
329<BR>
330&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns if a named output is multiple.</TD>
331</TR>
332<TR BGCOLOR="white" CLASS="TableRowColor">
333<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
334<CODE>static&nbsp;void</CODE></FONT></TD>
335<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html#setCountersEnabled(org.apache.hadoop.mapred.JobConf, boolean)">setCountersEnabled</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
336                   boolean&nbsp;enabled)</CODE>
337
338<BR>
339&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Enables or disables counters for the named outputs.</TD>
340</TR>
341</TABLE>
342&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
343<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
344<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
345<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>
346</TR>
347<TR BGCOLOR="white" CLASS="TableRowColor">
348<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>
349</TR>
350</TABLE>
351&nbsp;
352<P>
353
354<!-- ========= CONSTRUCTOR DETAIL ======== -->
355
356<A NAME="constructor_detail"><!-- --></A>
357<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
358<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
359<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
360<B>Constructor Detail</B></FONT></TH>
361</TR>
362</TABLE>
363
364<A NAME="MultipleOutputs(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
365MultipleOutputs</H3>
366<PRE>
367public <B>MultipleOutputs</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
368<DL>
369<DD>Creates and initializes multiple named outputs support, it should be
370 instantiated in the Mapper/Reducer configure method.
371<P>
372<DL>
373<DT><B>Parameters:</B><DD><CODE>job</CODE> - the job configuration object</DL>
374</DL>
375
376<!-- ============ METHOD DETAIL ========== -->
377
378<A NAME="method_detail"><!-- --></A>
379<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
380<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
381<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
382<B>Method Detail</B></FONT></TH>
383</TR>
384</TABLE>
385
386<A NAME="getNamedOutputsList(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
387getNamedOutputsList</H3>
388<PRE>
389public static <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<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>&gt; <B>getNamedOutputsList</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf)</PRE>
390<DL>
391<DD>Returns list of channel names.
392<P>
393<DD><DL>
394<DT><B>Parameters:</B><DD><CODE>conf</CODE> - job conf
395<DT><B>Returns:</B><DD>List of channel Names</DL>
396</DD>
397</DL>
398<HR>
399
400<A NAME="isMultiNamedOutput(org.apache.hadoop.mapred.JobConf, java.lang.String)"><!-- --></A><H3>
401isMultiNamedOutput</H3>
402<PRE>
403public static boolean <B>isMultiNamedOutput</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
404                                         <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;namedOutput)</PRE>
405<DL>
406<DD>Returns if a named output is multiple.
407<P>
408<DD><DL>
409<DT><B>Parameters:</B><DD><CODE>conf</CODE> - job conf<DD><CODE>namedOutput</CODE> - named output
410<DT><B>Returns:</B><DD><code>true</code> if the name output is multi, <code>false</code>
411         if it is single. If the name output is not defined it returns
412         <code>false</code></DL>
413</DD>
414</DL>
415<HR>
416
417<A NAME="getNamedOutputFormatClass(org.apache.hadoop.mapred.JobConf, java.lang.String)"><!-- --></A><H3>
418getNamedOutputFormatClass</H3>
419<PRE>
420public static <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/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</A>&gt; <B>getNamedOutputFormatClass</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
421                                                                      <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;namedOutput)</PRE>
422<DL>
423<DD>Returns the named output OutputFormat.
424<P>
425<DD><DL>
426<DT><B>Parameters:</B><DD><CODE>conf</CODE> - job conf<DD><CODE>namedOutput</CODE> - named output
427<DT><B>Returns:</B><DD>namedOutput OutputFormat</DL>
428</DD>
429</DL>
430<HR>
431
432<A NAME="getNamedOutputKeyClass(org.apache.hadoop.mapred.JobConf, java.lang.String)"><!-- --></A><H3>
433getNamedOutputKeyClass</H3>
434<PRE>
435public static <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/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&gt; <B>getNamedOutputKeyClass</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
436                                                                         <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;namedOutput)</PRE>
437<DL>
438<DD>Returns the key class for a named output.
439<P>
440<DD><DL>
441<DT><B>Parameters:</B><DD><CODE>conf</CODE> - job conf<DD><CODE>namedOutput</CODE> - named output
442<DT><B>Returns:</B><DD>class for the named output key</DL>
443</DD>
444</DL>
445<HR>
446
447<A NAME="getNamedOutputValueClass(org.apache.hadoop.mapred.JobConf, java.lang.String)"><!-- --></A><H3>
448getNamedOutputValueClass</H3>
449<PRE>
450public static <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/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt; <B>getNamedOutputValueClass</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
451                                                                 <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;namedOutput)</PRE>
452<DL>
453<DD>Returns the value class for a named output.
454<P>
455<DD><DL>
456<DT><B>Parameters:</B><DD><CODE>conf</CODE> - job conf<DD><CODE>namedOutput</CODE> - named output
457<DT><B>Returns:</B><DD>class of named output value</DL>
458</DD>
459</DL>
460<HR>
461
462<A NAME="addNamedOutput(org.apache.hadoop.mapred.JobConf, java.lang.String, java.lang.Class, java.lang.Class, java.lang.Class)"><!-- --></A><H3>
463addNamedOutput</H3>
464<PRE>
465public static void <B>addNamedOutput</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
466                                  <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;namedOutput,
467                                  <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/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</A>&gt;&nbsp;outputFormatClass,
468                                  <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;?&gt;&nbsp;keyClass,
469                                  <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;?&gt;&nbsp;valueClass)</PRE>
470<DL>
471<DD>Adds a named output for the job.
472 <p/>
473<P>
474<DD><DL>
475<DT><B>Parameters:</B><DD><CODE>conf</CODE> - job conf to add the named output<DD><CODE>namedOutput</CODE> - named output name, it has to be a word, letters
476                          and numbers only, cannot be the word 'part' as
477                          that is reserved for the
478                          default output.<DD><CODE>outputFormatClass</CODE> - OutputFormat class.<DD><CODE>keyClass</CODE> - key class<DD><CODE>valueClass</CODE> - value class</DL>
479</DD>
480</DL>
481<HR>
482
483<A NAME="addMultiNamedOutput(org.apache.hadoop.mapred.JobConf, java.lang.String, java.lang.Class, java.lang.Class, java.lang.Class)"><!-- --></A><H3>
484addMultiNamedOutput</H3>
485<PRE>
486public static void <B>addMultiNamedOutput</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
487                                       <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;namedOutput,
488                                       <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/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</A>&gt;&nbsp;outputFormatClass,
489                                       <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;?&gt;&nbsp;keyClass,
490                                       <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;?&gt;&nbsp;valueClass)</PRE>
491<DL>
492<DD>Adds a multi named output for the job.
493 <p/>
494<P>
495<DD><DL>
496<DT><B>Parameters:</B><DD><CODE>conf</CODE> - job conf to add the named output<DD><CODE>namedOutput</CODE> - named output name, it has to be a word, letters
497                          and numbers only, cannot be the word 'part' as
498                          that is reserved for the
499                          default output.<DD><CODE>outputFormatClass</CODE> - OutputFormat class.<DD><CODE>keyClass</CODE> - key class<DD><CODE>valueClass</CODE> - value class</DL>
500</DD>
501</DL>
502<HR>
503
504<A NAME="setCountersEnabled(org.apache.hadoop.mapred.JobConf, boolean)"><!-- --></A><H3>
505setCountersEnabled</H3>
506<PRE>
507public static void <B>setCountersEnabled</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
508                                      boolean&nbsp;enabled)</PRE>
509<DL>
510<DD>Enables or disables counters for the named outputs.
511 <p/>
512 By default these counters are disabled.
513 <p/>
514 MultipleOutputs supports counters, by default the are disabled.
515 The counters group is the <A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html" title="class in org.apache.hadoop.mapred.lib"><CODE>MultipleOutputs</CODE></A> class name.
516 </p>
517 The names of the counters are the same as the named outputs. For multi
518 named outputs the name of the counter is the concatenation of the named
519 output, and underscore '_' and the multiname.
520<P>
521<DD><DL>
522<DT><B>Parameters:</B><DD><CODE>conf</CODE> - job conf to enableadd the named output.<DD><CODE>enabled</CODE> - indicates if the counters will be enabled or not.</DL>
523</DD>
524</DL>
525<HR>
526
527<A NAME="getCountersEnabled(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
528getCountersEnabled</H3>
529<PRE>
530public static boolean <B>getCountersEnabled</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf)</PRE>
531<DL>
532<DD>Returns if the counters for the named outputs are enabled or not.
533 <p/>
534 By default these counters are disabled.
535 <p/>
536 MultipleOutputs supports counters, by default the are disabled.
537 The counters group is the <A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleOutputs.html" title="class in org.apache.hadoop.mapred.lib"><CODE>MultipleOutputs</CODE></A> class name.
538 </p>
539 The names of the counters are the same as the named outputs. For multi
540 named outputs the name of the counter is the concatenation of the named
541 output, and underscore '_' and the multiname.
542<P>
543<DD><DL>
544<DT><B>Parameters:</B><DD><CODE>conf</CODE> - job conf to enableadd the named output.
545<DT><B>Returns:</B><DD>TRUE if the counters are enabled, FALSE if they are disabled.</DL>
546</DD>
547</DL>
548<HR>
549
550<A NAME="getNamedOutputs()"><!-- --></A><H3>
551getNamedOutputs</H3>
552<PRE>
553public <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>&lt;<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>&gt; <B>getNamedOutputs</B>()</PRE>
554<DL>
555<DD>Returns iterator with the defined name outputs.
556<P>
557<DD><DL>
558
559<DT><B>Returns:</B><DD>iterator with the defined named outputs</DL>
560</DD>
561</DL>
562<HR>
563
564<A NAME="getCollector(java.lang.String, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
565getCollector</H3>
566<PRE>
567public <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A> <B>getCollector</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;namedOutput,
568                                    <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
569                             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>
570<DL>
571<DD>Gets the output collector for a named output.
572 <p/>
573<P>
574<DD><DL>
575<DT><B>Parameters:</B><DD><CODE>namedOutput</CODE> - the named output name<DD><CODE>reporter</CODE> - the reporter
576<DT><B>Returns:</B><DD>the output collector for the given named output
577<DT><B>Throws:</B>
578<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> - thrown if output collector could not be created</DL>
579</DD>
580</DL>
581<HR>
582
583<A NAME="getCollector(java.lang.String, java.lang.String, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
584getCollector</H3>
585<PRE>
586public <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A> <B>getCollector</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;namedOutput,
587                                    <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;multiName,
588                                    <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
589                             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>
590<DL>
591<DD>Gets the output collector for a multi named output.
592 <p/>
593<P>
594<DD><DL>
595<DT><B>Parameters:</B><DD><CODE>namedOutput</CODE> - the named output name<DD><CODE>multiName</CODE> - the multi name part<DD><CODE>reporter</CODE> - the reporter
596<DT><B>Returns:</B><DD>the output collector for the given named output
597<DT><B>Throws:</B>
598<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> - thrown if output collector could not be created</DL>
599</DD>
600</DL>
601<HR>
602
603<A NAME="close()"><!-- --></A><H3>
604close</H3>
605<PRE>
606public void <B>close</B>()
607           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>
608<DL>
609<DD>Closes all the opened named outputs.
610 <p/>
611 If overriden subclasses must invoke <code>super.close()</code> at the
612 end of their <code>close()</code>
613<P>
614<DD><DL>
615
616<DT><B>Throws:</B>
617<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> - thrown if any of the MultipleOutput files
618                             could not be closed properly.</DL>
619</DD>
620</DL>
621<!-- ========= END OF CLASS DATA ========= -->
622<HR>
623
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637  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/MultipleOutputs.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
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