source: proiecte/HadoopJUnit/hadoop-0.20.1/docs/api/org/apache/hadoop/mapred/Reporter.html @ 120

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6<TITLE>
7Reporter (Hadoop 0.20.1 API)
8</TITLE>
9
10<META NAME="date" CONTENT="2009-09-01">
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18        parent.document.title="Reporter (Hadoop 0.20.1 API)";
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57<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
58&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><B>PREV CLASS</B></A>&nbsp;
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79  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&nbsp;|&nbsp;CONSTR&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
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81DETAIL:&nbsp;<A HREF="#field_detail">FIELD</A>&nbsp;|&nbsp;CONSTR&nbsp;|&nbsp;<A HREF="#method_detail">METHOD</A></FONT></TD>
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88<!-- ======== START OF CLASS DATA ======== -->
89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.mapred</FONT>
92<BR>
93Interface Reporter</H2>
94<DL>
95<DT><B>All Superinterfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A></DD>
96</DL>
97<HR>
98<DL>
99<DT><PRE>public interface <B>Reporter</B><DT>extends <A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A></DL>
100</PRE>
101
102<P>
103A facility for Map-Reduce applications to report progress and update
104 counters, status information etc.
105 
106 <p><A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A> and <A HREF="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><CODE>Reducer</CODE></A> can use the <code>Reporter</code>
107 provided to report progress or just indicate that they are alive. In
108 scenarios where the application takes an insignificant amount of time to
109 process individual key/value pairs, this is crucial since the framework
110 might assume that the task has timed-out and kill that task.
111
112 <p>Applications can also update <A HREF="../../../../org/apache/hadoop/mapred/Counters.html" title="class in org.apache.hadoop.mapred"><CODE>Counters</CODE></A> via the provided
113 <code>Reporter</code> .</p>
114<P>
115
116<P>
117<DL>
118<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util"><CODE>Progressable</CODE></A>,
119<A HREF="../../../../org/apache/hadoop/mapred/Counters.html" title="class in org.apache.hadoop.mapred"><CODE>Counters</CODE></A></DL>
120<HR>
121
122<P>
123<!-- =========== FIELD SUMMARY =========== -->
124
125<A NAME="field_summary"><!-- --></A>
126<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
127<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
128<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
129<B>Field Summary</B></FONT></TH>
130</TR>
131<TR BGCOLOR="white" CLASS="TableRowColor">
132<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
133<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A></CODE></FONT></TD>
134<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Reporter.html#NULL">NULL</A></B></CODE>
135
136<BR>
137&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A constant of Reporter type that does nothing.</TD>
138</TR>
139</TABLE>
140&nbsp;
141<!-- ========== METHOD SUMMARY =========== -->
142
143<A NAME="method_summary"><!-- --></A>
144<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
145<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
146<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
147<B>Method Summary</B></FONT></TH>
148</TR>
149<TR BGCOLOR="white" CLASS="TableRowColor">
150<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
151<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A></CODE></FONT></TD>
152<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Reporter.html#getCounter(java.lang.Enum)">getCounter</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</A>&lt;?&gt;&nbsp;name)</CODE>
153
154<BR>
155&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the <A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred"><CODE>Counters.Counter</CODE></A> of the given group with the given name.</TD>
156</TR>
157<TR BGCOLOR="white" CLASS="TableRowColor">
158<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
159<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A></CODE></FONT></TD>
160<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Reporter.html#getCounter(java.lang.String, java.lang.String)">getCounter</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;group,
161           <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;name)</CODE>
162
163<BR>
164&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the <A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred"><CODE>Counters.Counter</CODE></A> of the given group with the given name.</TD>
165</TR>
166<TR BGCOLOR="white" CLASS="TableRowColor">
167<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
168<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></CODE></FONT></TD>
169<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Reporter.html#getInputSplit()">getInputSplit</A></B>()</CODE>
170
171<BR>
172&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A> object for a map.</TD>
173</TR>
174<TR BGCOLOR="white" CLASS="TableRowColor">
175<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
176<CODE>&nbsp;void</CODE></FONT></TD>
177<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Reporter.html#incrCounter(java.lang.Enum, long)">incrCounter</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</A>&lt;?&gt;&nbsp;key,
178            long&nbsp;amount)</CODE>
179
180<BR>
181&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Increments the counter identified by the key, which can be of
182 any <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang"><CODE>Enum</CODE></A> type, by the specified amount.</TD>
183</TR>
184<TR BGCOLOR="white" CLASS="TableRowColor">
185<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
186<CODE>&nbsp;void</CODE></FONT></TD>
187<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Reporter.html#incrCounter(java.lang.String, java.lang.String, long)">incrCounter</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;group,
188            <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;counter,
189            long&nbsp;amount)</CODE>
190
191<BR>
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Increments the counter identified by the group and counter name
193 by the specified amount.</TD>
194</TR>
195<TR BGCOLOR="white" CLASS="TableRowColor">
196<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
197<CODE>&nbsp;void</CODE></FONT></TD>
198<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Reporter.html#setStatus(java.lang.String)">setStatus</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;status)</CODE>
199
200<BR>
201&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the status description for the task.</TD>
202</TR>
203</TABLE>
204&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.util.Progressable"><!-- --></A>
205<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
206<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
207<TH ALIGN="left"><B>Methods inherited from interface org.apache.hadoop.util.<A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A></B></TH>
208</TR>
209<TR BGCOLOR="white" CLASS="TableRowColor">
210<TD><CODE><A HREF="../../../../org/apache/hadoop/util/Progressable.html#progress()">progress</A></CODE></TD>
211</TR>
212</TABLE>
213&nbsp;
214<P>
215
216<!-- ============ FIELD DETAIL =========== -->
217
218<A NAME="field_detail"><!-- --></A>
219<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
220<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
221<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
222<B>Field Detail</B></FONT></TH>
223</TR>
224</TABLE>
225
226<A NAME="NULL"><!-- --></A><H3>
227NULL</H3>
228<PRE>
229static final <A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A> <B>NULL</B></PRE>
230<DL>
231<DD>A constant of Reporter type that does nothing.
232<P>
233<DL>
234</DL>
235</DL>
236
237<!-- ============ METHOD DETAIL ========== -->
238
239<A NAME="method_detail"><!-- --></A>
240<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
241<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
242<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
243<B>Method Detail</B></FONT></TH>
244</TR>
245</TABLE>
246
247<A NAME="setStatus(java.lang.String)"><!-- --></A><H3>
248setStatus</H3>
249<PRE>
250void <B>setStatus</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;status)</PRE>
251<DL>
252<DD>Set the status description for the task.
253<P>
254<DD><DL>
255</DL>
256</DD>
257<DD><DL>
258<DT><B>Parameters:</B><DD><CODE>status</CODE> - brief description of the current status.</DL>
259</DD>
260</DL>
261<HR>
262
263<A NAME="getCounter(java.lang.Enum)"><!-- --></A><H3>
264getCounter</H3>
265<PRE>
266<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A> <B>getCounter</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</A>&lt;?&gt;&nbsp;name)</PRE>
267<DL>
268<DD>Get the <A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred"><CODE>Counters.Counter</CODE></A> of the given group with the given name.
269<P>
270<DD><DL>
271</DL>
272</DD>
273<DD><DL>
274<DT><B>Parameters:</B><DD><CODE>name</CODE> - counter name
275<DT><B>Returns:</B><DD>the <code>Counter</code> of the given group/name.</DL>
276</DD>
277</DL>
278<HR>
279
280<A NAME="getCounter(java.lang.String, java.lang.String)"><!-- --></A><H3>
281getCounter</H3>
282<PRE>
283<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A> <B>getCounter</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;group,
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;name)</PRE>
285<DL>
286<DD>Get the <A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred"><CODE>Counters.Counter</CODE></A> of the given group with the given name.
287<P>
288<DD><DL>
289</DL>
290</DD>
291<DD><DL>
292<DT><B>Parameters:</B><DD><CODE>group</CODE> - counter group<DD><CODE>name</CODE> - counter name
293<DT><B>Returns:</B><DD>the <code>Counter</code> of the given group/name.</DL>
294</DD>
295</DL>
296<HR>
297
298<A NAME="incrCounter(java.lang.Enum, long)"><!-- --></A><H3>
299incrCounter</H3>
300<PRE>
301void <B>incrCounter</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</A>&lt;?&gt;&nbsp;key,
302                 long&nbsp;amount)</PRE>
303<DL>
304<DD>Increments the counter identified by the key, which can be of
305 any <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang"><CODE>Enum</CODE></A> type, by the specified amount.
306<P>
307<DD><DL>
308</DL>
309</DD>
310<DD><DL>
311<DT><B>Parameters:</B><DD><CODE>key</CODE> - key to identify the counter to be incremented. The key can be
312            be any <code>Enum</code>.<DD><CODE>amount</CODE> - A non-negative amount by which the counter is to
313               be incremented.</DL>
314</DD>
315</DL>
316<HR>
317
318<A NAME="incrCounter(java.lang.String, java.lang.String, long)"><!-- --></A><H3>
319incrCounter</H3>
320<PRE>
321void <B>incrCounter</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;group,
322                 <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;counter,
323                 long&nbsp;amount)</PRE>
324<DL>
325<DD>Increments the counter identified by the group and counter name
326 by the specified amount.
327<P>
328<DD><DL>
329</DL>
330</DD>
331<DD><DL>
332<DT><B>Parameters:</B><DD><CODE>group</CODE> - name to identify the group of the counter to be incremented.<DD><CODE>counter</CODE> - name to identify the counter within the group.<DD><CODE>amount</CODE> - A non-negative amount by which the counter is to
333               be incremented.</DL>
334</DD>
335</DL>
336<HR>
337
338<A NAME="getInputSplit()"><!-- --></A><H3>
339getInputSplit</H3>
340<PRE>
341<A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A> <B>getInputSplit</B>()
342                         throws <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</A></PRE>
343<DL>
344<DD>Get the <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A> object for a map.
345<P>
346<DD><DL>
347</DL>
348</DD>
349<DD><DL>
350
351<DT><B>Returns:</B><DD>the <code>InputSplit</code> that the map is reading from.
352<DT><B>Throws:</B>
353<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</A></CODE> - if called outside a mapper</DL>
354</DD>
355</DL>
356<!-- ========= END OF CLASS DATA ========= -->
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366<A NAME="navbar_bottom_firstrow"><!-- --></A>
367<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">
368  <TR ALIGN="center" VALIGN="top">
369  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
370  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>
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372  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/Reporter.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
373  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
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