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7PipeMapper (Hadoop 0.20.1 API)
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79  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;<A HREF="#fields_inherited_from_class_org.apache.hadoop.streaming.PipeMapRed">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.streaming</FONT>
92<BR>
93Class PipeMapper</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/streaming/PipeMapRed.html" title="class in org.apache.hadoop.streaming">org.apache.hadoop.streaming.PipeMapRed</A>
97      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.streaming.PipeMapper</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></DD>
101</DL>
102<HR>
103<DL>
104<DT><PRE>public class <B>PipeMapper</B><DT>extends <A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html" title="class in org.apache.hadoop.streaming">PipeMapRed</A><DT>implements <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper</A></DL>
105</PRE>
106
107<P>
108A generic Mapper bridge.
109  It delegates operations to an external program via stdin and stdout.
110<P>
111
112<P>
113<HR>
114
115<P>
116<!-- =========== FIELD SUMMARY =========== -->
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121<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
122<B>Field Summary</B></FONT></TH>
123</TR>
124</TABLE>
125&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.streaming.PipeMapRed"><!-- --></A>
126<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
127<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
128<TH ALIGN="left"><B>Fields inherited from class org.apache.hadoop.streaming.<A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html" title="class in org.apache.hadoop.streaming">PipeMapRed</A></B></TH>
129</TR>
130<TR BGCOLOR="white" CLASS="TableRowColor">
131<TD><CODE><A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html#LOG">LOG</A>, <A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html#outerrThreadsThrowable">outerrThreadsThrowable</A></CODE></TD>
132</TR>
133</TABLE>
134&nbsp;
135<!-- ======== CONSTRUCTOR SUMMARY ======== -->
136
137<A NAME="constructor_summary"><!-- --></A>
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140<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
141<B>Constructor Summary</B></FONT></TH>
142</TR>
143<TR BGCOLOR="white" CLASS="TableRowColor">
144<TD><CODE><B><A HREF="../../../../org/apache/hadoop/streaming/PipeMapper.html#PipeMapper()">PipeMapper</A></B>()</CODE>
145
146<BR>
147&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
148</TR>
149</TABLE>
150&nbsp;
151<!-- ========== METHOD SUMMARY =========== -->
152
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156<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
157<B>Method Summary</B></FONT></TH>
158</TR>
159<TR BGCOLOR="white" CLASS="TableRowColor">
160<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
161<CODE>&nbsp;void</CODE></FONT></TD>
162<TD><CODE><B><A HREF="../../../../org/apache/hadoop/streaming/PipeMapper.html#close()">close</A></B>()</CODE>
163
164<BR>
165&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
166</TR>
167<TR BGCOLOR="white" CLASS="TableRowColor">
168<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
169<CODE>&nbsp;void</CODE></FONT></TD>
170<TD><CODE><B><A HREF="../../../../org/apache/hadoop/streaming/PipeMapper.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>
171
172<BR>
173&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>
174</TR>
175<TR BGCOLOR="white" CLASS="TableRowColor">
176<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
177<CODE>&nbsp;void</CODE></FONT></TD>
178<TD><CODE><B><A HREF="../../../../org/apache/hadoop/streaming/PipeMapper.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;key,
179    <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;value,
180    <A HREF="../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&nbsp;output,
181    <A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Maps a single input key/value pair into an intermediate key/value pair.</TD>
185</TR>
186</TABLE>
187&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.streaming.PipeMapRed"><!-- --></A>
188<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
189<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
190<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.streaming.<A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html" title="class in org.apache.hadoop.streaming">PipeMapRed</A></B></TH>
191</TR>
192<TR BGCOLOR="white" CLASS="TableRowColor">
193<TD><CODE><A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html#getContext()">getContext</A>, <A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html#mapRedFinished()">mapRedFinished</A></CODE></TD>
194</TR>
195</TABLE>
196&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
197<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
198<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
199<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>
200</TR>
201<TR BGCOLOR="white" CLASS="TableRowColor">
202<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>
203</TR>
204</TABLE>
205&nbsp;
206<P>
207
208<!-- ========= CONSTRUCTOR DETAIL ======== -->
209
210<A NAME="constructor_detail"><!-- --></A>
211<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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213<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
214<B>Constructor Detail</B></FONT></TH>
215</TR>
216</TABLE>
217
218<A NAME="PipeMapper()"><!-- --></A><H3>
219PipeMapper</H3>
220<PRE>
221public <B>PipeMapper</B>()</PRE>
222<DL>
223</DL>
224
225<!-- ============ METHOD DETAIL ========== -->
226
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230<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
231<B>Method Detail</B></FONT></TH>
232</TR>
233</TABLE>
234
235<A NAME="configure(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
236configure</H3>
237<PRE>
238public void <B>configure</B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
239<DL>
240<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/mapred/JobConfigurable.html#configure(org.apache.hadoop.mapred.JobConf)">JobConfigurable</A></CODE></B></DD>
241<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>.
242<P>
243<DD><DL>
244<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/streaming/PipeMapRed.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></CODE> in class <CODE><A HREF="../../../../org/apache/hadoop/streaming/PipeMapRed.html" title="class in org.apache.hadoop.streaming">PipeMapRed</A></CODE></DL>
245</DD>
246<DD><DL>
247<DT><B>Parameters:</B><DD><CODE>job</CODE> - the configuration</DL>
248</DD>
249</DL>
250<HR>
251
252<A NAME="map(java.lang.Object, java.lang.Object, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
253map</H3>
254<PRE>
255public 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;key,
256                <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;value,
257                <A HREF="../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&nbsp;output,
258                <A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
259         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>
260<DL>
261<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>
262<DD>Maps a single input key/value pair into an intermediate key/value pair.
263 
264 <p>Output pairs need not be of the same types as input pairs.  A given
265 input pair may map to zero or many output pairs.  Output pairs are
266 collected with calls to
267 <A HREF="../../../../org/apache/hadoop/mapred/OutputCollector.html#collect(K, V)"><CODE>OutputCollector.collect(Object,Object)</CODE></A>.</p>
268
269 <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
270 or just indicate that they are alive. In scenarios where the application
271 takes an insignificant amount of time to process individual key/value
272 pairs, this is crucial since the framework might assume that the task has
273 timed-out and kill that task. The other way of avoiding this is to set
274 <a href="../../../../../mapred-default.html#mapred.task.timeout">
275 mapred.task.timeout</a> to a high-enough value (or even zero for no
276 time-outs).</p>
277<P>
278<DD><DL>
279<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/mapred/Mapper.html#map(K1, V1, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">map</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper</A></CODE></DL>
280</DD>
281<DD><DL>
282<DT><B>Parameters:</B><DD><CODE>key</CODE> - the input key.<DD><CODE>value</CODE> - the input value.<DD><CODE>output</CODE> - collects mapped keys and values.<DD><CODE>reporter</CODE> - facility to report progress.
283<DT><B>Throws:</B>
284<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>
285</DD>
286</DL>
287<HR>
288
289<A NAME="close()"><!-- --></A><H3>
290close</H3>
291<PRE>
292public void <B>close</B>()</PRE>
293<DL>
294<DD><DL>
295<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true#close()" title="class or interface in java.io">close</A></CODE> in interface <CODE><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></CODE></DL>
296</DD>
297<DD><DL>
298</DL>
299</DD>
300</DL>
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