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7SkipBadRecords (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapred</FONT>
92<BR>
93Class SkipBadRecords</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.SkipBadRecords</B>
97</PRE>
98<HR>
99<DL>
100<DT><PRE>public class <B>SkipBadRecords</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>
104Utility class for skip bad records functionality. It contains various
105 settings related to skipping of bad records.
106 
107 <p>Hadoop provides an optional mode of execution in which the bad records
108 are detected and skipped in further attempts.
109 
110 <p>This feature can be used when map/reduce tasks crashes deterministically on
111 certain input. This happens due to bugs in the map/reduce function. The usual
112 course would be to fix these bugs. But sometimes this is not possible;
113 perhaps the bug is in third party libraries for which the source code is
114 not available. Due to this, the task never reaches to completion even with
115 multiple attempts and complete data for that task is lost.</p>
116 
117 <p>With this feature, only a small portion of data is lost surrounding
118 the bad record, which may be acceptable for some user applications.
119 see <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#setMapperMaxSkipRecords(org.apache.hadoop.conf.Configuration, long)"><CODE>setMapperMaxSkipRecords(Configuration, long)</CODE></A></p>
120 
121 <p>The skipping mode gets kicked off after certain no of failures
122 see <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#setAttemptsToStartSkipping(org.apache.hadoop.conf.Configuration, int)"><CODE>setAttemptsToStartSkipping(Configuration, int)</CODE></A></p>
123 
124 <p>In the skipping mode, the map/reduce task maintains the record range which
125 is getting processed at all times. Before giving the input to the
126 map/reduce function, it sends this record range to the Task tracker.
127 If task crashes, the Task tracker knows which one was the last reported
128 range. On further attempts that range get skipped.</p>
129<P>
130
131<P>
132<HR>
133
134<P>
135<!-- =========== FIELD SUMMARY =========== -->
136
137<A NAME="field_summary"><!-- --></A>
138<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
139<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
140<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
141<B>Field Summary</B></FONT></TH>
142</TR>
143<TR BGCOLOR="white" CLASS="TableRowColor">
144<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
145<CODE>static&nbsp;<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></CODE></FONT></TD>
146<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_GROUP">COUNTER_GROUP</A></B></CODE>
147
148<BR>
149&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Special counters which are written by the application and are
150 used by the framework for detecting bad records.</TD>
151</TR>
152<TR BGCOLOR="white" CLASS="TableRowColor">
153<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
154<CODE>static&nbsp;<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></CODE></FONT></TD>
155<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_MAP_PROCESSED_RECORDS">COUNTER_MAP_PROCESSED_RECORDS</A></B></CODE>
156
157<BR>
158&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Number of processed map records.</TD>
159</TR>
160<TR BGCOLOR="white" CLASS="TableRowColor">
161<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
162<CODE>static&nbsp;<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></CODE></FONT></TD>
163<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_REDUCE_PROCESSED_GROUPS">COUNTER_REDUCE_PROCESSED_GROUPS</A></B></CODE>
164
165<BR>
166&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Number of processed reduce groups.</TD>
167</TR>
168</TABLE>
169&nbsp;
170<!-- ======== CONSTRUCTOR SUMMARY ======== -->
171
172<A NAME="constructor_summary"><!-- --></A>
173<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
174<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
175<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
176<B>Constructor Summary</B></FONT></TH>
177</TR>
178<TR BGCOLOR="white" CLASS="TableRowColor">
179<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#SkipBadRecords()">SkipBadRecords</A></B>()</CODE>
180
181<BR>
182&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
183</TR>
184</TABLE>
185&nbsp;
186<!-- ========== METHOD SUMMARY =========== -->
187
188<A NAME="method_summary"><!-- --></A>
189<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
190<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
191<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
192<B>Method Summary</B></FONT></TH>
193</TR>
194<TR BGCOLOR="white" CLASS="TableRowColor">
195<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
196<CODE>static&nbsp;int</CODE></FONT></TD>
197<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#getAttemptsToStartSkipping(org.apache.hadoop.conf.Configuration)">getAttemptsToStartSkipping</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
198
199<BR>
200&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the number of Task attempts AFTER which skip mode
201 will be kicked off.</TD>
202</TR>
203<TR BGCOLOR="white" CLASS="TableRowColor">
204<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
205<CODE>static&nbsp;boolean</CODE></FONT></TD>
206<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#getAutoIncrMapperProcCount(org.apache.hadoop.conf.Configuration)">getAutoIncrMapperProcCount</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
207
208<BR>
209&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the flag which if set to true,
210 <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_MAP_PROCESSED_RECORDS"><CODE>COUNTER_MAP_PROCESSED_RECORDS</CODE></A> is incremented
211 by MapRunner after invoking the map function.</TD>
212</TR>
213<TR BGCOLOR="white" CLASS="TableRowColor">
214<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
215<CODE>static&nbsp;boolean</CODE></FONT></TD>
216<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#getAutoIncrReducerProcCount(org.apache.hadoop.conf.Configuration)">getAutoIncrReducerProcCount</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
217
218<BR>
219&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the flag which if set to true,
220 <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_REDUCE_PROCESSED_GROUPS"><CODE>COUNTER_REDUCE_PROCESSED_GROUPS</CODE></A> is incremented
221 by framework after invoking the reduce function.</TD>
222</TR>
223<TR BGCOLOR="white" CLASS="TableRowColor">
224<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
225<CODE>static&nbsp;long</CODE></FONT></TD>
226<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#getMapperMaxSkipRecords(org.apache.hadoop.conf.Configuration)">getMapperMaxSkipRecords</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
227
228<BR>
229&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the number of acceptable skip records surrounding the bad record PER
230 bad record in mapper.</TD>
231</TR>
232<TR BGCOLOR="white" CLASS="TableRowColor">
233<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
234<CODE>static&nbsp;long</CODE></FONT></TD>
235<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#getReducerMaxSkipGroups(org.apache.hadoop.conf.Configuration)">getReducerMaxSkipGroups</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
236
237<BR>
238&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the number of acceptable skip groups surrounding the bad group PER
239 bad group in reducer.</TD>
240</TR>
241<TR BGCOLOR="white" CLASS="TableRowColor">
242<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
243<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A></CODE></FONT></TD>
244<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#getSkipOutputPath(org.apache.hadoop.conf.Configuration)">getSkipOutputPath</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
245
246<BR>
247&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the directory to which skipped records are written.</TD>
248</TR>
249<TR BGCOLOR="white" CLASS="TableRowColor">
250<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
251<CODE>static&nbsp;void</CODE></FONT></TD>
252<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#setAttemptsToStartSkipping(org.apache.hadoop.conf.Configuration, int)">setAttemptsToStartSkipping</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
253                           int&nbsp;attemptsToStartSkipping)</CODE>
254
255<BR>
256&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the number of Task attempts AFTER which skip mode
257 will be kicked off.</TD>
258</TR>
259<TR BGCOLOR="white" CLASS="TableRowColor">
260<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
261<CODE>static&nbsp;void</CODE></FONT></TD>
262<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#setAutoIncrMapperProcCount(org.apache.hadoop.conf.Configuration, boolean)">setAutoIncrMapperProcCount</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
263                           boolean&nbsp;autoIncr)</CODE>
264
265<BR>
266&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the flag which if set to true,
267 <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_MAP_PROCESSED_RECORDS"><CODE>COUNTER_MAP_PROCESSED_RECORDS</CODE></A> is incremented
268 by MapRunner after invoking the map function.</TD>
269</TR>
270<TR BGCOLOR="white" CLASS="TableRowColor">
271<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
272<CODE>static&nbsp;void</CODE></FONT></TD>
273<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#setAutoIncrReducerProcCount(org.apache.hadoop.conf.Configuration, boolean)">setAutoIncrReducerProcCount</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
274                            boolean&nbsp;autoIncr)</CODE>
275
276<BR>
277&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the flag which if set to true,
278 <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_REDUCE_PROCESSED_GROUPS"><CODE>COUNTER_REDUCE_PROCESSED_GROUPS</CODE></A> is incremented
279 by framework after invoking the reduce function.</TD>
280</TR>
281<TR BGCOLOR="white" CLASS="TableRowColor">
282<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
283<CODE>static&nbsp;void</CODE></FONT></TD>
284<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#setMapperMaxSkipRecords(org.apache.hadoop.conf.Configuration, long)">setMapperMaxSkipRecords</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
285                        long&nbsp;maxSkipRecs)</CODE>
286
287<BR>
288&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the number of acceptable skip records surrounding the bad record PER
289 bad record in mapper.</TD>
290</TR>
291<TR BGCOLOR="white" CLASS="TableRowColor">
292<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
293<CODE>static&nbsp;void</CODE></FONT></TD>
294<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#setReducerMaxSkipGroups(org.apache.hadoop.conf.Configuration, long)">setReducerMaxSkipGroups</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
295                        long&nbsp;maxSkipGrps)</CODE>
296
297<BR>
298&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the number of acceptable skip groups surrounding the bad group PER
299 bad group in reducer.</TD>
300</TR>
301<TR BGCOLOR="white" CLASS="TableRowColor">
302<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
303<CODE>static&nbsp;void</CODE></FONT></TD>
304<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#setSkipOutputPath(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.fs.Path)">setSkipOutputPath</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
305                  <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;path)</CODE>
306
307<BR>
308&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the directory to which skipped records are written.</TD>
309</TR>
310</TABLE>
311&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
312<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
313<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
314<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>
315</TR>
316<TR BGCOLOR="white" CLASS="TableRowColor">
317<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>
318</TR>
319</TABLE>
320&nbsp;
321<P>
322
323<!-- ============ FIELD DETAIL =========== -->
324
325<A NAME="field_detail"><!-- --></A>
326<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
327<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
328<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
329<B>Field Detail</B></FONT></TH>
330</TR>
331</TABLE>
332
333<A NAME="COUNTER_GROUP"><!-- --></A><H3>
334COUNTER_GROUP</H3>
335<PRE>
336public static final <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> <B>COUNTER_GROUP</B></PRE>
337<DL>
338<DD>Special counters which are written by the application and are
339 used by the framework for detecting bad records. For detecting bad records
340 these counters must be incremented by the application.
341<P>
342<DL>
343<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.SkipBadRecords.COUNTER_GROUP">Constant Field Values</A></DL>
344</DL>
345<HR>
346
347<A NAME="COUNTER_MAP_PROCESSED_RECORDS"><!-- --></A><H3>
348COUNTER_MAP_PROCESSED_RECORDS</H3>
349<PRE>
350public static final <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> <B>COUNTER_MAP_PROCESSED_RECORDS</B></PRE>
351<DL>
352<DD>Number of processed map records.
353<P>
354<DL>
355<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#getAutoIncrMapperProcCount(org.apache.hadoop.conf.Configuration)"><CODE>getAutoIncrMapperProcCount(Configuration)</CODE></A>,
356<A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.SkipBadRecords.COUNTER_MAP_PROCESSED_RECORDS">Constant Field Values</A></DL>
357</DL>
358<HR>
359
360<A NAME="COUNTER_REDUCE_PROCESSED_GROUPS"><!-- --></A><H3>
361COUNTER_REDUCE_PROCESSED_GROUPS</H3>
362<PRE>
363public static final <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> <B>COUNTER_REDUCE_PROCESSED_GROUPS</B></PRE>
364<DL>
365<DD>Number of processed reduce groups.
366<P>
367<DL>
368<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#getAutoIncrReducerProcCount(org.apache.hadoop.conf.Configuration)"><CODE>getAutoIncrReducerProcCount(Configuration)</CODE></A>,
369<A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.SkipBadRecords.COUNTER_REDUCE_PROCESSED_GROUPS">Constant Field Values</A></DL>
370</DL>
371
372<!-- ========= CONSTRUCTOR DETAIL ======== -->
373
374<A NAME="constructor_detail"><!-- --></A>
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378<B>Constructor Detail</B></FONT></TH>
379</TR>
380</TABLE>
381
382<A NAME="SkipBadRecords()"><!-- --></A><H3>
383SkipBadRecords</H3>
384<PRE>
385public <B>SkipBadRecords</B>()</PRE>
386<DL>
387</DL>
388
389<!-- ============ METHOD DETAIL ========== -->
390
391<A NAME="method_detail"><!-- --></A>
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395<B>Method Detail</B></FONT></TH>
396</TR>
397</TABLE>
398
399<A NAME="getAttemptsToStartSkipping(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
400getAttemptsToStartSkipping</H3>
401<PRE>
402public static int <B>getAttemptsToStartSkipping</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
403<DL>
404<DD>Get the number of Task attempts AFTER which skip mode
405 will be kicked off. When skip mode is kicked off, the
406 tasks reports the range of records which it will process
407 next to the TaskTracker. So that on failures, TT knows which
408 ones are possibly the bad records. On further executions,
409 those are skipped.
410 Default value is 2.
411<P>
412<DD><DL>
413<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration
414<DT><B>Returns:</B><DD>attemptsToStartSkipping no of task attempts</DL>
415</DD>
416</DL>
417<HR>
418
419<A NAME="setAttemptsToStartSkipping(org.apache.hadoop.conf.Configuration, int)"><!-- --></A><H3>
420setAttemptsToStartSkipping</H3>
421<PRE>
422public static void <B>setAttemptsToStartSkipping</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
423                                              int&nbsp;attemptsToStartSkipping)</PRE>
424<DL>
425<DD>Set the number of Task attempts AFTER which skip mode
426 will be kicked off. When skip mode is kicked off, the
427 tasks reports the range of records which it will process
428 next to the TaskTracker. So that on failures, TT knows which
429 ones are possibly the bad records. On further executions,
430 those are skipped.
431 Default value is 2.
432<P>
433<DD><DL>
434<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration<DD><CODE>attemptsToStartSkipping</CODE> - no of task attempts</DL>
435</DD>
436</DL>
437<HR>
438
439<A NAME="getAutoIncrMapperProcCount(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
440getAutoIncrMapperProcCount</H3>
441<PRE>
442public static boolean <B>getAutoIncrMapperProcCount</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
443<DL>
444<DD>Get the flag which if set to true,
445 <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_MAP_PROCESSED_RECORDS"><CODE>COUNTER_MAP_PROCESSED_RECORDS</CODE></A> is incremented
446 by MapRunner after invoking the map function. This value must be set to
447 false for applications which process the records asynchronously
448 or buffer the input records. For example streaming.
449 In such cases applications should increment this counter on their own.
450 Default value is true.
451<P>
452<DD><DL>
453<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration
454<DT><B>Returns:</B><DD><code>true</code> if auto increment
455                       <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_MAP_PROCESSED_RECORDS"><CODE>COUNTER_MAP_PROCESSED_RECORDS</CODE></A>.
456         <code>false</code> otherwise.</DL>
457</DD>
458</DL>
459<HR>
460
461<A NAME="setAutoIncrMapperProcCount(org.apache.hadoop.conf.Configuration, boolean)"><!-- --></A><H3>
462setAutoIncrMapperProcCount</H3>
463<PRE>
464public static void <B>setAutoIncrMapperProcCount</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
465                                              boolean&nbsp;autoIncr)</PRE>
466<DL>
467<DD>Set the flag which if set to true,
468 <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_MAP_PROCESSED_RECORDS"><CODE>COUNTER_MAP_PROCESSED_RECORDS</CODE></A> is incremented
469 by MapRunner after invoking the map function. This value must be set to
470 false for applications which process the records asynchronously
471 or buffer the input records. For example streaming.
472 In such cases applications should increment this counter on their own.
473 Default value is true.
474<P>
475<DD><DL>
476<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration<DD><CODE>autoIncr</CODE> - whether to auto increment
477        <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_MAP_PROCESSED_RECORDS"><CODE>COUNTER_MAP_PROCESSED_RECORDS</CODE></A>.</DL>
478</DD>
479</DL>
480<HR>
481
482<A NAME="getAutoIncrReducerProcCount(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
483getAutoIncrReducerProcCount</H3>
484<PRE>
485public static boolean <B>getAutoIncrReducerProcCount</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
486<DL>
487<DD>Get the flag which if set to true,
488 <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_REDUCE_PROCESSED_GROUPS"><CODE>COUNTER_REDUCE_PROCESSED_GROUPS</CODE></A> is incremented
489 by framework after invoking the reduce function. This value must be set to
490 false for applications which process the records asynchronously
491 or buffer the input records. For example streaming.
492 In such cases applications should increment this counter on their own.
493 Default value is true.
494<P>
495<DD><DL>
496<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration
497<DT><B>Returns:</B><DD><code>true</code> if auto increment
498                    <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_REDUCE_PROCESSED_GROUPS"><CODE>COUNTER_REDUCE_PROCESSED_GROUPS</CODE></A>.
499         <code>false</code> otherwise.</DL>
500</DD>
501</DL>
502<HR>
503
504<A NAME="setAutoIncrReducerProcCount(org.apache.hadoop.conf.Configuration, boolean)"><!-- --></A><H3>
505setAutoIncrReducerProcCount</H3>
506<PRE>
507public static void <B>setAutoIncrReducerProcCount</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
508                                               boolean&nbsp;autoIncr)</PRE>
509<DL>
510<DD>Set the flag which if set to true,
511 <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_REDUCE_PROCESSED_GROUPS"><CODE>COUNTER_REDUCE_PROCESSED_GROUPS</CODE></A> is incremented
512 by framework after invoking the reduce function. This value must be set to
513 false for applications which process the records asynchronously
514 or buffer the input records. For example streaming.
515 In such cases applications should increment this counter on their own.
516 Default value is true.
517<P>
518<DD><DL>
519<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration<DD><CODE>autoIncr</CODE> - whether to auto increment
520        <A HREF="../../../../org/apache/hadoop/mapred/SkipBadRecords.html#COUNTER_REDUCE_PROCESSED_GROUPS"><CODE>COUNTER_REDUCE_PROCESSED_GROUPS</CODE></A>.</DL>
521</DD>
522</DL>
523<HR>
524
525<A NAME="getSkipOutputPath(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
526getSkipOutputPath</H3>
527<PRE>
528public static <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A> <B>getSkipOutputPath</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
529<DL>
530<DD>Get the directory to which skipped records are written. By default it is
531 the sub directory of the output _logs directory.
532 User can stop writing skipped records by setting the value null.
533<P>
534<DD><DL>
535<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration.
536<DT><B>Returns:</B><DD>path skip output directory. Null is returned if this is not set
537 and output directory is also not set.</DL>
538</DD>
539</DL>
540<HR>
541
542<A NAME="setSkipOutputPath(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.fs.Path)"><!-- --></A><H3>
543setSkipOutputPath</H3>
544<PRE>
545public static void <B>setSkipOutputPath</B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
546                                     <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;path)</PRE>
547<DL>
548<DD>Set the directory to which skipped records are written. By default it is
549 the sub directory of the output _logs directory.
550 User can stop writing skipped records by setting the value null.
551<P>
552<DD><DL>
553<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration.<DD><CODE>path</CODE> - skip output directory path</DL>
554</DD>
555</DL>
556<HR>
557
558<A NAME="getMapperMaxSkipRecords(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
559getMapperMaxSkipRecords</H3>
560<PRE>
561public static long <B>getMapperMaxSkipRecords</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
562<DL>
563<DD>Get the number of acceptable skip records surrounding the bad record PER
564 bad record in mapper. The number includes the bad record as well.
565 To turn the feature of detection/skipping of bad records off, set the
566 value to 0.
567 The framework tries to narrow down the skipped range by retrying 
568 until this threshold is met OR all attempts get exhausted for this task.
569 Set the value to Long.MAX_VALUE to indicate that framework need not try to
570 narrow down. Whatever records(depends on application) get skipped are
571 acceptable.
572 Default value is 0.
573<P>
574<DD><DL>
575<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration
576<DT><B>Returns:</B><DD>maxSkipRecs acceptable skip records.</DL>
577</DD>
578</DL>
579<HR>
580
581<A NAME="setMapperMaxSkipRecords(org.apache.hadoop.conf.Configuration, long)"><!-- --></A><H3>
582setMapperMaxSkipRecords</H3>
583<PRE>
584public static void <B>setMapperMaxSkipRecords</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
585                                           long&nbsp;maxSkipRecs)</PRE>
586<DL>
587<DD>Set the number of acceptable skip records surrounding the bad record PER
588 bad record in mapper. The number includes the bad record as well.
589 To turn the feature of detection/skipping of bad records off, set the
590 value to 0.
591 The framework tries to narrow down the skipped range by retrying 
592 until this threshold is met OR all attempts get exhausted for this task.
593 Set the value to Long.MAX_VALUE to indicate that framework need not try to
594 narrow down. Whatever records(depends on application) get skipped are
595 acceptable.
596 Default value is 0.
597<P>
598<DD><DL>
599<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration<DD><CODE>maxSkipRecs</CODE> - acceptable skip records.</DL>
600</DD>
601</DL>
602<HR>
603
604<A NAME="getReducerMaxSkipGroups(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
605getReducerMaxSkipGroups</H3>
606<PRE>
607public static long <B>getReducerMaxSkipGroups</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
608<DL>
609<DD>Get the number of acceptable skip groups surrounding the bad group PER
610 bad group in reducer. The number includes the bad group as well.
611 To turn the feature of detection/skipping of bad groups off, set the
612 value to 0.
613 The framework tries to narrow down the skipped range by retrying 
614 until this threshold is met OR all attempts get exhausted for this task.
615 Set the value to Long.MAX_VALUE to indicate that framework need not try to
616 narrow down. Whatever groups(depends on application) get skipped are
617 acceptable.
618 Default value is 0.
619<P>
620<DD><DL>
621<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration
622<DT><B>Returns:</B><DD>maxSkipGrps acceptable skip groups.</DL>
623</DD>
624</DL>
625<HR>
626
627<A NAME="setReducerMaxSkipGroups(org.apache.hadoop.conf.Configuration, long)"><!-- --></A><H3>
628setReducerMaxSkipGroups</H3>
629<PRE>
630public static void <B>setReducerMaxSkipGroups</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
631                                           long&nbsp;maxSkipGrps)</PRE>
632<DL>
633<DD>Set the number of acceptable skip groups surrounding the bad group PER
634 bad group in reducer. The number includes the bad group as well.
635 To turn the feature of detection/skipping of bad groups off, set the
636 value to 0.
637 The framework tries to narrow down the skipped range by retrying 
638 until this threshold is met OR all attempts get exhausted for this task.
639 Set the value to Long.MAX_VALUE to indicate that framework need not try to
640 narrow down. Whatever groups(depends on application) get skipped are
641 acceptable.
642 Default value is 0.
643<P>
644<DD><DL>
645<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration<DD><CODE>maxSkipGrps</CODE> - acceptable skip groups.</DL>
646</DD>
647</DL>
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