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

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7OutputCommitter (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapreduce</FONT>
92<BR>
93Class OutputCommitter</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.mapreduce.OutputCommitter</B>
97</PRE>
98<DL>
99<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/mapreduce/lib/output/FileOutputCommitter.html" title="class in org.apache.hadoop.mapreduce.lib.output">FileOutputCommitter</A>, <A HREF="../../../../org/apache/hadoop/mapred/OutputCommitter.html" title="class in org.apache.hadoop.mapred">OutputCommitter</A></DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public abstract class <B>OutputCommitter</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>
104</PRE>
105
106<P>
107<code>OutputCommitter</code> describes the commit of task output for a
108 Map-Reduce job.
109
110 <p>The Map-Reduce framework relies on the <code>OutputCommitter</code> of
111 the job to:<p>
112 <ol>
113   <li>
114   Setup the job during initialization. For example, create the temporary
115   output directory for the job during the initialization of the job.
116   </li>
117   <li>
118   Cleanup the job after the job completion. For example, remove the
119   temporary output directory after the job completion.
120   </li>
121   <li>
122   Setup the task temporary output.
123   </li> 
124   <li>
125   Check whether a task needs a commit. This is to avoid the commit
126   procedure if a task does not need commit.
127   </li>
128   <li>
129   Commit of the task output.
130   </li> 
131   <li>
132   Discard the task commit.
133   </li>
134 </ol>
135<P>
136
137<P>
138<DL>
139<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/mapreduce/lib/output/FileOutputCommitter.html" title="class in org.apache.hadoop.mapreduce.lib.output"><CODE>FileOutputCommitter</CODE></A>,
140<A HREF="../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce"><CODE>JobContext</CODE></A>,
141<A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce"><CODE>TaskAttemptContext</CODE></A></DL>
142<HR>
143
144<P>
145
146<!-- ======== CONSTRUCTOR SUMMARY ======== -->
147
148<A NAME="constructor_summary"><!-- --></A>
149<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
150<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
151<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
152<B>Constructor Summary</B></FONT></TH>
153</TR>
154<TR BGCOLOR="white" CLASS="TableRowColor">
155<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/OutputCommitter.html#OutputCommitter()">OutputCommitter</A></B>()</CODE>
156
157<BR>
158&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
159</TR>
160</TABLE>
161&nbsp;
162<!-- ========== METHOD SUMMARY =========== -->
163
164<A NAME="method_summary"><!-- --></A>
165<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
166<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
167<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
168<B>Method Summary</B></FONT></TH>
169</TR>
170<TR BGCOLOR="white" CLASS="TableRowColor">
171<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
172<CODE>abstract &nbsp;void</CODE></FONT></TD>
173<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/OutputCommitter.html#abortTask(org.apache.hadoop.mapreduce.TaskAttemptContext)">abortTask</A></B>(<A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;taskContext)</CODE>
174
175<BR>
176&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Discard the task output</TD>
177</TR>
178<TR BGCOLOR="white" CLASS="TableRowColor">
179<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
180<CODE>abstract &nbsp;void</CODE></FONT></TD>
181<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/OutputCommitter.html#cleanupJob(org.apache.hadoop.mapreduce.JobContext)">cleanupJob</A></B>(<A HREF="../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;jobContext)</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For cleaning up the job's output after job completion</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>abstract &nbsp;void</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/OutputCommitter.html#commitTask(org.apache.hadoop.mapreduce.TaskAttemptContext)">commitTask</A></B>(<A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;taskContext)</CODE>
190
191<BR>
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To promote the task's temporary output to final output location
193 
194 The task's output is moved to the job's output directory.</TD>
195</TR>
196<TR BGCOLOR="white" CLASS="TableRowColor">
197<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
198<CODE>abstract &nbsp;boolean</CODE></FONT></TD>
199<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/OutputCommitter.html#needsTaskCommit(org.apache.hadoop.mapreduce.TaskAttemptContext)">needsTaskCommit</A></B>(<A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;taskContext)</CODE>
200
201<BR>
202&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Check whether task needs a commit</TD>
203</TR>
204<TR BGCOLOR="white" CLASS="TableRowColor">
205<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
206<CODE>abstract &nbsp;void</CODE></FONT></TD>
207<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/OutputCommitter.html#setupJob(org.apache.hadoop.mapreduce.JobContext)">setupJob</A></B>(<A HREF="../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;jobContext)</CODE>
208
209<BR>
210&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For the framework to setup the job output during initialization</TD>
211</TR>
212<TR BGCOLOR="white" CLASS="TableRowColor">
213<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
214<CODE>abstract &nbsp;void</CODE></FONT></TD>
215<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/OutputCommitter.html#setupTask(org.apache.hadoop.mapreduce.TaskAttemptContext)">setupTask</A></B>(<A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;taskContext)</CODE>
216
217<BR>
218&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets up output for the task.</TD>
219</TR>
220</TABLE>
221&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
222<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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224<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>
225</TR>
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227<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>
228</TR>
229</TABLE>
230&nbsp;
231<P>
232
233<!-- ========= CONSTRUCTOR DETAIL ======== -->
234
235<A NAME="constructor_detail"><!-- --></A>
236<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
237<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
238<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
239<B>Constructor Detail</B></FONT></TH>
240</TR>
241</TABLE>
242
243<A NAME="OutputCommitter()"><!-- --></A><H3>
244OutputCommitter</H3>
245<PRE>
246public <B>OutputCommitter</B>()</PRE>
247<DL>
248</DL>
249
250<!-- ============ METHOD DETAIL ========== -->
251
252<A NAME="method_detail"><!-- --></A>
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255<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
256<B>Method Detail</B></FONT></TH>
257</TR>
258</TABLE>
259
260<A NAME="setupJob(org.apache.hadoop.mapreduce.JobContext)"><!-- --></A><H3>
261setupJob</H3>
262<PRE>
263public abstract void <B>setupJob</B>(<A HREF="../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;jobContext)
264                       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>
265<DL>
266<DD>For the framework to setup the job output during initialization
267<P>
268<DD><DL>
269<DT><B>Parameters:</B><DD><CODE>jobContext</CODE> - Context of the job whose output is being written.
270<DT><B>Throws:</B>
271<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> - if temporary output could not be created</DL>
272</DD>
273</DL>
274<HR>
275
276<A NAME="cleanupJob(org.apache.hadoop.mapreduce.JobContext)"><!-- --></A><H3>
277cleanupJob</H3>
278<PRE>
279public abstract void <B>cleanupJob</B>(<A HREF="../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;jobContext)
280                         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>
281<DL>
282<DD>For cleaning up the job's output after job completion
283<P>
284<DD><DL>
285<DT><B>Parameters:</B><DD><CODE>jobContext</CODE> - Context of the job whose output is being written.
286<DT><B>Throws:</B>
287<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>
288</DD>
289</DL>
290<HR>
291
292<A NAME="setupTask(org.apache.hadoop.mapreduce.TaskAttemptContext)"><!-- --></A><H3>
293setupTask</H3>
294<PRE>
295public abstract void <B>setupTask</B>(<A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;taskContext)
296                        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>
297<DL>
298<DD>Sets up output for the task.
299<P>
300<DD><DL>
301<DT><B>Parameters:</B><DD><CODE>taskContext</CODE> - Context of the task whose output is being written.
302<DT><B>Throws:</B>
303<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>
304</DD>
305</DL>
306<HR>
307
308<A NAME="needsTaskCommit(org.apache.hadoop.mapreduce.TaskAttemptContext)"><!-- --></A><H3>
309needsTaskCommit</H3>
310<PRE>
311public abstract boolean <B>needsTaskCommit</B>(<A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;taskContext)
312                                 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>
313<DL>
314<DD>Check whether task needs a commit
315<P>
316<DD><DL>
317<DT><B>Parameters:</B><DD><CODE>taskContext</CODE> -
318<DT><B>Returns:</B><DD>true/false
319<DT><B>Throws:</B>
320<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>
321</DD>
322</DL>
323<HR>
324
325<A NAME="commitTask(org.apache.hadoop.mapreduce.TaskAttemptContext)"><!-- --></A><H3>
326commitTask</H3>
327<PRE>
328public abstract void <B>commitTask</B>(<A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;taskContext)
329                         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>
330<DL>
331<DD>To promote the task's temporary output to final output location
332 
333 The task's output is moved to the job's output directory.
334<P>
335<DD><DL>
336<DT><B>Parameters:</B><DD><CODE>taskContext</CODE> - Context of the task whose output is being written.
337<DT><B>Throws:</B>
338<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> - if commit is not</DL>
339</DD>
340</DL>
341<HR>
342
343<A NAME="abortTask(org.apache.hadoop.mapreduce.TaskAttemptContext)"><!-- --></A><H3>
344abortTask</H3>
345<PRE>
346public abstract void <B>abortTask</B>(<A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;taskContext)
347                        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>
348<DL>
349<DD>Discard the task output
350<P>
351<DD><DL>
352<DT><B>Parameters:</B><DD><CODE>taskContext</CODE> -
353<DT><B>Throws:</B>
354<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>
355</DD>
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