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7JobHistory (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapred</FONT>
92<BR>
93Class JobHistory</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.JobHistory</B>
97</PRE>
98<HR>
99<DL>
100<DT><PRE>public class <B>JobHistory</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>
104Provides methods for writing to and reading from job history.
105 Job History works in an append mode, JobHistory and its inner classes provide methods
106 to log job events.
107 
108 JobHistory is split into multiple files, format of each file is plain text where each line
109 is of the format [type (key=value)*], where type identifies the type of the record.
110 Type maps to UID of one of the inner classes of this class.
111 
112 Job history is maintained in a master index which contains star/stop times of all jobs with
113 a few other job level properties. Apart from this each job's history is maintained in a seperate history
114 file. name of job history files follows the format jobtrackerId_jobid
115 
116 For parsing the job history it supports a listener based interface where each line is parsed
117 and passed to listener. The listener can create an object model of history or look for specific
118 events and discard rest of the history. 
119 
120 CHANGE LOG :
121 Version 0 : The history has the following format :
122             TAG KEY1="VALUE1" KEY2="VALUE2" and so on.
123               TAG can be Job, Task, MapAttempt or ReduceAttempt.
124               Note that a '"' is the line delimiter.
125 Version 1 : Changes the line delimiter to '.'
126               Values are now escaped for unambiguous parsing.
127               Added the Meta tag to store version info.
128<P>
129
130<P>
131<HR>
132
133<P>
134<!-- ======== NESTED CLASS SUMMARY ======== -->
135
136<A NAME="nested_class_summary"><!-- --></A>
137<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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139<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
140<B>Nested Class Summary</B></FONT></TH>
141</TR>
142<TR BGCOLOR="white" CLASS="TableRowColor">
143<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
144<CODE>static&nbsp;class</CODE></FONT></TD>
145<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.HistoryCleaner.html" title="class in org.apache.hadoop.mapred">JobHistory.HistoryCleaner</A></B></CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Delete history files older than one month.</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
152<CODE>static&nbsp;class</CODE></FONT></TD>
153<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.JobInfo.html" title="class in org.apache.hadoop.mapred">JobHistory.JobInfo</A></B></CODE>
154
155<BR>
156&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Helper class for logging or reading back events related to job start, finish or failure.</TD>
157</TR>
158<TR BGCOLOR="white" CLASS="TableRowColor">
159<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
160<CODE>static&nbsp;class</CODE></FONT></TD>
161<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Keys.html" title="enum in org.apache.hadoop.mapred">JobHistory.Keys</A></B></CODE>
162
163<BR>
164&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Job history files contain key="value" pairs, where keys belong to this enum.</TD>
165</TR>
166<TR BGCOLOR="white" CLASS="TableRowColor">
167<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
168<CODE>static&nbsp;interface</CODE></FONT></TD>
169<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Listener.html" title="interface in org.apache.hadoop.mapred">JobHistory.Listener</A></B></CODE>
170
171<BR>
172&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Callback interface for reading back log events from JobHistory.</TD>
173</TR>
174<TR BGCOLOR="white" CLASS="TableRowColor">
175<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
176<CODE>static&nbsp;class</CODE></FONT></TD>
177<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.MapAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.MapAttempt</A></B></CODE>
178
179<BR>
180&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Helper class for logging or reading back events related to start, finish or failure of
181 a Map Attempt on a node.</TD>
182</TR>
183<TR BGCOLOR="white" CLASS="TableRowColor">
184<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
185<CODE>static&nbsp;class</CODE></FONT></TD>
186<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.RecordTypes.html" title="enum in org.apache.hadoop.mapred">JobHistory.RecordTypes</A></B></CODE>
187
188<BR>
189&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Record types are identifiers for each line of log in history files.</TD>
190</TR>
191<TR BGCOLOR="white" CLASS="TableRowColor">
192<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
193<CODE>static&nbsp;class</CODE></FONT></TD>
194<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.ReduceAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.ReduceAttempt</A></B></CODE>
195
196<BR>
197&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Helper class for logging or reading back events related to start, finish or failure of
198 a Map Attempt on a node.</TD>
199</TR>
200<TR BGCOLOR="white" CLASS="TableRowColor">
201<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
202<CODE>static&nbsp;class</CODE></FONT></TD>
203<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Task.html" title="class in org.apache.hadoop.mapred">JobHistory.Task</A></B></CODE>
204
205<BR>
206&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Helper class for logging or reading back events related to Task's start, finish or failure.</TD>
207</TR>
208<TR BGCOLOR="white" CLASS="TableRowColor">
209<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
210<CODE>static&nbsp;class</CODE></FONT></TD>
211<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.TaskAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.TaskAttempt</A></B></CODE>
212
213<BR>
214&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Base class for Map and Reduce TaskAttempts.</TD>
215</TR>
216<TR BGCOLOR="white" CLASS="TableRowColor">
217<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
218<CODE>static&nbsp;class</CODE></FONT></TD>
219<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Values.html" title="enum in org.apache.hadoop.mapred">JobHistory.Values</A></B></CODE>
220
221<BR>
222&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This enum contains some of the values commonly used by history log events.</TD>
223</TR>
224</TABLE>
225&nbsp;<!-- =========== FIELD SUMMARY =========== -->
226
227<A NAME="field_summary"><!-- --></A>
228<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
229<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
230<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
231<B>Field Summary</B></FONT></TH>
232</TR>
233<TR BGCOLOR="white" CLASS="TableRowColor">
234<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
235<CODE>static&nbsp;int</CODE></FONT></TD>
236<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.html#JOB_NAME_TRIM_LENGTH">JOB_NAME_TRIM_LENGTH</A></B></CODE>
237
238<BR>
239&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
240</TR>
241<TR BGCOLOR="white" CLASS="TableRowColor">
242<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
243<CODE>static&nbsp;org.apache.commons.logging.Log</CODE></FONT></TD>
244<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.html#LOG">LOG</A></B></CODE>
245
246<BR>
247&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
248</TR>
249</TABLE>
250&nbsp;
251<!-- ======== CONSTRUCTOR SUMMARY ======== -->
252
253<A NAME="constructor_summary"><!-- --></A>
254<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
255<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
256<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
257<B>Constructor Summary</B></FONT></TH>
258</TR>
259<TR BGCOLOR="white" CLASS="TableRowColor">
260<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.html#JobHistory()">JobHistory</A></B>()</CODE>
261
262<BR>
263&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
264</TR>
265</TABLE>
266&nbsp;
267<!-- ========== METHOD SUMMARY =========== -->
268
269<A NAME="method_summary"><!-- --></A>
270<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
271<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
272<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
273<B>Method Summary</B></FONT></TH>
274</TR>
275<TR BGCOLOR="white" CLASS="TableRowColor">
276<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
277<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>
278<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.html#getTaskLogsUrl(org.apache.hadoop.mapred.JobHistory.TaskAttempt)">getTaskLogsUrl</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/JobHistory.TaskAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.TaskAttempt</A>&nbsp;attempt)</CODE>
279
280<BR>
281&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the TaskLogsUrl of a particular TaskAttempt</TD>
282</TR>
283<TR BGCOLOR="white" CLASS="TableRowColor">
284<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
285<CODE>static&nbsp;boolean</CODE></FONT></TD>
286<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.html#init(org.apache.hadoop.mapred.JobConf, java.lang.String, long)">init</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
287     <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;hostname,
288     long&nbsp;jobTrackerStartTime)</CODE>
289
290<BR>
291&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initialize JobHistory files.</TD>
292</TR>
293<TR BGCOLOR="white" CLASS="TableRowColor">
294<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
295<CODE>static&nbsp;boolean</CODE></FONT></TD>
296<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.html#isDisableHistory()">isDisableHistory</A></B>()</CODE>
297
298<BR>
299&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns history disable status.</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/JobHistory.html#parseHistoryFromFS(java.lang.String, org.apache.hadoop.mapred.JobHistory.Listener, org.apache.hadoop.fs.FileSystem)">parseHistoryFromFS</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;path,
305                   <A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Listener.html" title="interface in org.apache.hadoop.mapred">JobHistory.Listener</A>&nbsp;l,
306                   <A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs)</CODE>
307
308<BR>
309&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Parses history file and invokes Listener.handle() for
310 each line of history.</TD>
311</TR>
312<TR BGCOLOR="white" CLASS="TableRowColor">
313<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
314<CODE>static&nbsp;void</CODE></FONT></TD>
315<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/JobHistory.html#setDisableHistory(boolean)">setDisableHistory</A></B>(boolean&nbsp;disableHistory)</CODE>
316
317<BR>
318&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Enable/disable history logging.</TD>
319</TR>
320</TABLE>
321&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
322<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
323<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
324<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>
325</TR>
326<TR BGCOLOR="white" CLASS="TableRowColor">
327<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>
328</TR>
329</TABLE>
330&nbsp;
331<P>
332
333<!-- ============ FIELD DETAIL =========== -->
334
335<A NAME="field_detail"><!-- --></A>
336<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
337<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
338<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
339<B>Field Detail</B></FONT></TH>
340</TR>
341</TABLE>
342
343<A NAME="LOG"><!-- --></A><H3>
344LOG</H3>
345<PRE>
346public static final org.apache.commons.logging.Log <B>LOG</B></PRE>
347<DL>
348<DL>
349</DL>
350</DL>
351<HR>
352
353<A NAME="JOB_NAME_TRIM_LENGTH"><!-- --></A><H3>
354JOB_NAME_TRIM_LENGTH</H3>
355<PRE>
356public static final int <B>JOB_NAME_TRIM_LENGTH</B></PRE>
357<DL>
358<DL>
359<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.JobHistory.JOB_NAME_TRIM_LENGTH">Constant Field Values</A></DL>
360</DL>
361
362<!-- ========= CONSTRUCTOR DETAIL ======== -->
363
364<A NAME="constructor_detail"><!-- --></A>
365<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
366<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
367<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
368<B>Constructor Detail</B></FONT></TH>
369</TR>
370</TABLE>
371
372<A NAME="JobHistory()"><!-- --></A><H3>
373JobHistory</H3>
374<PRE>
375public <B>JobHistory</B>()</PRE>
376<DL>
377</DL>
378
379<!-- ============ METHOD DETAIL ========== -->
380
381<A NAME="method_detail"><!-- --></A>
382<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
383<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
384<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
385<B>Method Detail</B></FONT></TH>
386</TR>
387</TABLE>
388
389<A NAME="init(org.apache.hadoop.mapred.JobConf, java.lang.String, long)"><!-- --></A><H3>
390init</H3>
391<PRE>
392public static boolean <B>init</B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf,
393                           <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;hostname,
394                           long&nbsp;jobTrackerStartTime)</PRE>
395<DL>
396<DD>Initialize JobHistory files.
397<P>
398<DD><DL>
399<DT><B>Parameters:</B><DD><CODE>conf</CODE> - Jobconf of the job tracker.<DD><CODE>hostname</CODE> - jobtracker's hostname<DD><CODE>jobTrackerStartTime</CODE> - jobtracker's start time
400<DT><B>Returns:</B><DD>true if intialized properly
401         false otherwise</DL>
402</DD>
403</DL>
404<HR>
405
406<A NAME="parseHistoryFromFS(java.lang.String, org.apache.hadoop.mapred.JobHistory.Listener, org.apache.hadoop.fs.FileSystem)"><!-- --></A><H3>
407parseHistoryFromFS</H3>
408<PRE>
409public static void <B>parseHistoryFromFS</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;path,
410                                      <A HREF="../../../../org/apache/hadoop/mapred/JobHistory.Listener.html" title="interface in org.apache.hadoop.mapred">JobHistory.Listener</A>&nbsp;l,
411                                      <A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs)
412                               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>
413<DL>
414<DD>Parses history file and invokes Listener.handle() for
415 each line of history. It can be used for looking through history
416 files for specific items without having to keep whole history in memory.
417<P>
418<DD><DL>
419<DT><B>Parameters:</B><DD><CODE>path</CODE> - path to history file<DD><CODE>l</CODE> - Listener for history events<DD><CODE>fs</CODE> - FileSystem where history file is present
420<DT><B>Throws:</B>
421<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>
422</DD>
423</DL>
424<HR>
425
426<A NAME="isDisableHistory()"><!-- --></A><H3>
427isDisableHistory</H3>
428<PRE>
429public static boolean <B>isDisableHistory</B>()</PRE>
430<DL>
431<DD>Returns history disable status. by default history is enabled so this
432 method returns false.
433<P>
434<DD><DL>
435
436<DT><B>Returns:</B><DD>true if history logging is disabled, false otherwise.</DL>
437</DD>
438</DL>
439<HR>
440
441<A NAME="setDisableHistory(boolean)"><!-- --></A><H3>
442setDisableHistory</H3>
443<PRE>
444public static void <B>setDisableHistory</B>(boolean&nbsp;disableHistory)</PRE>
445<DL>
446<DD>Enable/disable history logging. Default value is false, so history
447 is enabled by default.
448<P>
449<DD><DL>
450<DT><B>Parameters:</B><DD><CODE>disableHistory</CODE> - true if history should be disabled, false otherwise.</DL>
451</DD>
452</DL>
453<HR>
454
455<A NAME="getTaskLogsUrl(org.apache.hadoop.mapred.JobHistory.TaskAttempt)"><!-- --></A><H3>
456getTaskLogsUrl</H3>
457<PRE>
458public static <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>getTaskLogsUrl</B>(<A HREF="../../../../org/apache/hadoop/mapred/JobHistory.TaskAttempt.html" title="class in org.apache.hadoop.mapred">JobHistory.TaskAttempt</A>&nbsp;attempt)</PRE>
459<DL>
460<DD>Return the TaskLogsUrl of a particular TaskAttempt
461<P>
462<DD><DL>
463<DT><B>Parameters:</B><DD><CODE>attempt</CODE> -
464<DT><B>Returns:</B><DD>the taskLogsUrl. null if http-port or tracker-name or
465         task-attempt-id are unavailable.</DL>
466</DD>
467</DL>
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