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

Last change on this file since 120 was 120, checked in by (none), 14 years ago

Added the mail files for the Hadoop JUNit Project
  • Property svn:executable set to *
File size: 62.2 KB
Line 
1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
2<!--NewPage-->
3<HTML>
4<HEAD>
5<!-- Generated by javadoc (build 1.6.0_07) on Tue Sep 01 20:56:57 UTC 2009 -->
6<TITLE>
7TaskTracker (Hadoop 0.20.1 API)
8</TITLE>
9
10<META NAME="date" CONTENT="2009-09-01">
11
12<LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style">
13
14<SCRIPT type="text/javascript">
15function windowTitle()
16{
17    if (location.href.indexOf('is-external=true') == -1) {
18        parent.document.title="TaskTracker (Hadoop 0.20.1 API)";
19    }
20}
21</SCRIPT>
22<NOSCRIPT>
23</NOSCRIPT>
24
25</HEAD>
26
27<BODY BGCOLOR="white" onload="windowTitle();">
28<HR>
29
30
31<!-- ========= START OF TOP NAVBAR ======= -->
32<A NAME="navbar_top"><!-- --></A>
33<A HREF="#skip-navbar_top" title="Skip navigation links"></A>
34<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY="">
35<TR>
36<TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1">
37<A NAME="navbar_top_firstrow"><!-- --></A>
38<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">
39  <TR ALIGN="center" VALIGN="top">
40  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
41  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>
42  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT>&nbsp;</TD>
43  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/TaskTracker.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
44  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
45  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>
46  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A>&nbsp;</TD>
47  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A>&nbsp;</TD>
48  </TR>
49</TABLE>
50</TD>
51<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
52</EM>
53</TD>
54</TR>
55
56<TR>
57<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
58&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/TaskReport.html" title="class in org.apache.hadoop.mapred"><B>PREV CLASS</B></A>&nbsp;
59&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.MapOutputServlet.html" title="class in org.apache.hadoop.mapred"><B>NEXT CLASS</B></A></FONT></TD>
60<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
61  <A HREF="../../../../index.html?org/apache/hadoop/mapred/TaskTracker.html" target="_top"><B>FRAMES</B></A>  &nbsp;
62&nbsp;<A HREF="TaskTracker.html" target="_top"><B>NO FRAMES</B></A>  &nbsp;
63&nbsp;<SCRIPT type="text/javascript">
64  <!--
65  if(window==top) {
66    document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>');
67  }
68  //-->
69</SCRIPT>
70<NOSCRIPT>
71  <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>
72</NOSCRIPT>
73
74
75</FONT></TD>
76</TR>
77<TR>
78<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
79  SUMMARY:&nbsp;<A HREF="#nested_class_summary">NESTED</A>&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
80<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
81DETAIL:&nbsp;<A HREF="#field_detail">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_detail">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_detail">METHOD</A></FONT></TD>
82</TR>
83</TABLE>
84<A NAME="skip-navbar_top"></A>
85<!-- ========= END OF TOP NAVBAR ========= -->
86
87<HR>
88<!-- ======== START OF CLASS DATA ======== -->
89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.mapred</FONT>
92<BR>
93Class TaskTracker</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.TaskTracker</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</A></DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>TaskTracker</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><DT>implements <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</A></DL>
104</PRE>
105
106<P>
107TaskTracker is a process that starts and tracks MR Tasks
108 in a networked environment.  It contacts the JobTracker
109 for Task assignments and reporting results.
110<P>
111
112<P>
113<HR>
114
115<P>
116<!-- ======== NESTED CLASS SUMMARY ======== -->
117
118<A NAME="nested_class_summary"><!-- --></A>
119<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
120<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
121<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
122<B>Nested Class Summary</B></FONT></TH>
123</TR>
124<TR BGCOLOR="white" CLASS="TableRowColor">
125<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
126<CODE>static&nbsp;class</CODE></FONT></TD>
127<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.MapOutputServlet.html" title="class in org.apache.hadoop.mapred">TaskTracker.MapOutputServlet</A></B></CODE>
128
129<BR>
130&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This class is used in TaskTracker's Jetty to serve the map outputs
131 to other nodes.</TD>
132</TR>
133</TABLE>
134&nbsp;<!-- =========== FIELD SUMMARY =========== -->
135
136<A NAME="field_summary"><!-- --></A>
137<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
138<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
139<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
140<B>Field 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;org.apache.commons.logging.Log</CODE></FONT></TD>
145<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#ClientTraceLog">ClientTraceLog</A></B></CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
152<CODE>static&nbsp;int</CODE></FONT></TD>
153<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#CLUSTER_INCREMENT">CLUSTER_INCREMENT</A></B></CODE>
154
155<BR>
156&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
157</TR>
158<TR BGCOLOR="white" CLASS="TableRowColor">
159<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
160<CODE>static&nbsp;long</CODE></FONT></TD>
161<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#COUNTER_UPDATE_INTERVAL">COUNTER_UPDATE_INTERVAL</A></B></CODE>
162
163<BR>
164&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
165</TR>
166<TR BGCOLOR="white" CLASS="TableRowColor">
167<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
168<CODE>static&nbsp;int</CODE></FONT></TD>
169<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#FILE_NOT_FOUND">FILE_NOT_FOUND</A></B></CODE>
170
171<BR>
172&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
173</TR>
174<TR BGCOLOR="white" CLASS="TableRowColor">
175<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
176<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>
177<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#FOR_REDUCE_TASK">FOR_REDUCE_TASK</A></B></CODE>
178
179<BR>
180&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The reduce task number for which this map output is being transferred</TD>
181</TR>
182<TR BGCOLOR="white" CLASS="TableRowColor">
183<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
184<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>
185<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#FROM_MAP_TASK">FROM_MAP_TASK</A></B></CODE>
186
187<BR>
188&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The map task from which the map output data is being transferred</TD>
189</TR>
190<TR BGCOLOR="white" CLASS="TableRowColor">
191<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
192<CODE>static&nbsp;int</CODE></FONT></TD>
193<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#HEARTBEAT_INTERVAL_MIN">HEARTBEAT_INTERVAL_MIN</A></B></CODE>
194
195<BR>
196&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
197</TR>
198<TR BGCOLOR="white" CLASS="TableRowColor">
199<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
200<CODE>static&nbsp;org.apache.commons.logging.Log</CODE></FONT></TD>
201<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#LOG">LOG</A></B></CODE>
202
203<BR>
204&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
205</TR>
206<TR BGCOLOR="white" CLASS="TableRowColor">
207<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
208<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>
209<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#MAP_OUTPUT_LENGTH">MAP_OUTPUT_LENGTH</A></B></CODE>
210
211<BR>
212&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The custom http header used for the map output length.</TD>
213</TR>
214<TR BGCOLOR="white" CLASS="TableRowColor">
215<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
216<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>
217<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#MR_CLIENTTRACE_FORMAT">MR_CLIENTTRACE_FORMAT</A></B></CODE>
218
219<BR>
220&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
221</TR>
222<TR BGCOLOR="white" CLASS="TableRowColor">
223<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
224<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>
225<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#RAW_MAP_OUTPUT_LENGTH">RAW_MAP_OUTPUT_LENGTH</A></B></CODE>
226
227<BR>
228&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The custom http header used for the "raw" map output length.</TD>
229</TR>
230<TR BGCOLOR="white" CLASS="TableRowColor">
231<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
232<CODE>static&nbsp;int</CODE></FONT></TD>
233<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#SUCCESS">SUCCESS</A></B></CODE>
234
235<BR>
236&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
237</TR>
238<TR BGCOLOR="white" CLASS="TableRowColor">
239<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
240<CODE>static&nbsp;long</CODE></FONT></TD>
241<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#versionID">versionID</A></B></CODE>
242
243<BR>
244&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Changed the version to 2, since we have a new method getMapOutputs
245 Changed version to 3 to have progress() return a boolean
246 Changed the version to 4, since we have replaced
247         TaskUmbilicalProtocol.progress(String, float, String,
248         org.apache.hadoop.mapred.TaskStatus.Phase, Counters)
249         with statusUpdate(String, TaskStatus)
250 
251 Version 5 changed counters representation for HADOOP-2248
252 Version 6 changes the TaskStatus representation for HADOOP-2208
253 Version 7 changes the done api (via HADOOP-3140).</TD>
254</TR>
255<TR BGCOLOR="white" CLASS="TableRowColor">
256<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
257<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>
258<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#WORKDIR">WORKDIR</A></B></CODE>
259
260<BR>
261&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
262</TR>
263</TABLE>
264&nbsp;
265<!-- ======== CONSTRUCTOR SUMMARY ======== -->
266
267<A NAME="constructor_summary"><!-- --></A>
268<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
269<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
270<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
271<B>Constructor Summary</B></FONT></TH>
272</TR>
273<TR BGCOLOR="white" CLASS="TableRowColor">
274<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#TaskTracker(org.apache.hadoop.mapred.JobConf)">TaskTracker</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf)</CODE>
275
276<BR>
277&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Start with the local machine name, and the default JobTracker</TD>
278</TR>
279</TABLE>
280&nbsp;
281<!-- ========== METHOD SUMMARY =========== -->
282
283<A NAME="method_summary"><!-- --></A>
284<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
285<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
286<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
287<B>Method Summary</B></FONT></TH>
288</TR>
289<TR BGCOLOR="white" CLASS="TableRowColor">
290<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
291<CODE>&nbsp;boolean</CODE></FONT></TD>
292<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#canCommit(org.apache.hadoop.mapred.TaskAttemptID)">canCommit</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid)</CODE>
293
294<BR>
295&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Child checking whether it can commit</TD>
296</TR>
297<TR BGCOLOR="white" CLASS="TableRowColor">
298<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
299<CODE>&nbsp;void</CODE></FONT></TD>
300<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#cleanupStorage()">cleanupStorage</A></B>()</CODE>
301
302<BR>
303&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Removes all contents of temporary storage.</TD>
304</TR>
305<TR BGCOLOR="white" CLASS="TableRowColor">
306<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
307<CODE>&nbsp;void</CODE></FONT></TD>
308<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#close()">close</A></B>()</CODE>
309
310<BR>
311&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Close down the TaskTracker and all its components.</TD>
312</TR>
313<TR BGCOLOR="white" CLASS="TableRowColor">
314<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
315<CODE>&nbsp;void</CODE></FONT></TD>
316<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#commitPending(org.apache.hadoop.mapred.TaskAttemptID, org.apache.hadoop.mapred.TaskStatus)">commitPending</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid,
317              org.apache.hadoop.mapred.TaskStatus&nbsp;taskStatus)</CODE>
318
319<BR>
320&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Task is reporting that it is in commit_pending
321 and it is waiting for the commit Response</TD>
322</TR>
323<TR BGCOLOR="white" CLASS="TableRowColor">
324<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
325<CODE>&nbsp;void</CODE></FONT></TD>
326<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#done(org.apache.hadoop.mapred.TaskAttemptID)">done</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid)</CODE>
327
328<BR>
329&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The task is done.</TD>
330</TR>
331<TR BGCOLOR="white" CLASS="TableRowColor">
332<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
333<CODE>&nbsp;void</CODE></FONT></TD>
334<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#fatalError(org.apache.hadoop.mapred.TaskAttemptID, java.lang.String)">fatalError</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskId,
335           <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;msg)</CODE>
336
337<BR>
338&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A child task had a fatal error.</TD>
339</TR>
340<TR BGCOLOR="white" CLASS="TableRowColor">
341<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
342<CODE>&nbsp;void</CODE></FONT></TD>
343<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#fsError(org.apache.hadoop.mapred.TaskAttemptID, java.lang.String)">fsError</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskId,
344        <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;message)</CODE>
345
346<BR>
347&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A child task had a local filesystem error.</TD>
348</TR>
349<TR BGCOLOR="white" CLASS="TableRowColor">
350<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
351<CODE>static&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends org.apache.hadoop.mapred.TaskTrackerInstrumentation&gt;</CODE></FONT></TD>
352<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#getInstrumentationClass(org.apache.hadoop.conf.Configuration)">getInstrumentationClass</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
353
354<BR>
355&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
356</TR>
357<TR BGCOLOR="white" CLASS="TableRowColor">
358<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
359<CODE>&nbsp;org.apache.hadoop.mapred.InterTrackerProtocol</CODE></FONT></TD>
360<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#getJobClient()">getJobClient</A></B>()</CODE>
361
362<BR>
363&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The connection to the JobTracker, used by the TaskRunner
364 for locating remote files.</TD>
365</TR>
366<TR BGCOLOR="white" CLASS="TableRowColor">
367<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
368<CODE>&nbsp;org.apache.hadoop.mapred.JvmManager</CODE></FONT></TD>
369<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#getJvmManagerInstance()">getJvmManagerInstance</A></B>()</CODE>
370
371<BR>
372&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
373</TR>
374<TR BGCOLOR="white" CLASS="TableRowColor">
375<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
376<CODE>&nbsp;org.apache.hadoop.mapred.MapTaskCompletionEventsUpdate</CODE></FONT></TD>
377<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#getMapCompletionEvents(org.apache.hadoop.mapred.JobID, int, int, org.apache.hadoop.mapred.TaskAttemptID)">getMapCompletionEvents</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/JobID.html" title="class in org.apache.hadoop.mapred">JobID</A>&nbsp;jobId,
378                       int&nbsp;fromEventId,
379                       int&nbsp;maxLocs,
380                       <A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;id)</CODE>
381
382<BR>
383&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Called by a reduce task to get the map output locations for finished maps.</TD>
384</TR>
385<TR BGCOLOR="white" CLASS="TableRowColor">
386<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
387<CODE>&nbsp;long</CODE></FONT></TD>
388<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#getProtocolVersion(java.lang.String, long)">getProtocolVersion</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;protocol,
389                   long&nbsp;clientVersion)</CODE>
390
391<BR>
392&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return protocol version corresponding to protocol interface.</TD>
393</TR>
394<TR BGCOLOR="white" CLASS="TableRowColor">
395<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
396<CODE>&nbsp;org.apache.hadoop.mapred.JvmTask</CODE></FONT></TD>
397<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#getTask(org.apache.hadoop.mapred.JVMId)">getTask</A></B>(org.apache.hadoop.mapred.JVMId&nbsp;jvmId)</CODE>
398
399<BR>
400&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Called upon startup by the child process, to fetch Task data.</TD>
401</TR>
402<TR BGCOLOR="white" CLASS="TableRowColor">
403<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
404<CODE>&nbsp;org.apache.hadoop.mapred.TaskMemoryManagerThread</CODE></FONT></TD>
405<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#getTaskMemoryManager()">getTaskMemoryManager</A></B>()</CODE>
406
407<BR>
408&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
409</TR>
410<TR BGCOLOR="white" CLASS="TableRowColor">
411<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
412<CODE>&nbsp;org.apache.hadoop.mapred.TaskTrackerInstrumentation</CODE></FONT></TD>
413<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#getTaskTrackerInstrumentation()">getTaskTrackerInstrumentation</A></B>()</CODE>
414
415<BR>
416&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
417</TR>
418<TR BGCOLOR="white" CLASS="TableRowColor">
419<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
420<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/net/InetSocketAddress.html?is-external=true" title="class or interface in java.net">InetSocketAddress</A></CODE></FONT></TD>
421<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#getTaskTrackerReportAddress()">getTaskTrackerReportAddress</A></B>()</CODE>
422
423<BR>
424&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the port at which the tasktracker bound to</TD>
425</TR>
426<TR BGCOLOR="white" CLASS="TableRowColor">
427<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
428<CODE>&nbsp;boolean</CODE></FONT></TD>
429<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#isIdle()">isIdle</A></B>()</CODE>
430
431<BR>
432&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Is this task tracker idle?</TD>
433</TR>
434<TR BGCOLOR="white" CLASS="TableRowColor">
435<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
436<CODE>&nbsp;boolean</CODE></FONT></TD>
437<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#isTaskMemoryManagerEnabled()">isTaskMemoryManagerEnabled</A></B>()</CODE>
438
439<BR>
440&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Is the TaskMemoryManager Enabled on this system?</TD>
441</TR>
442<TR BGCOLOR="white" CLASS="TableRowColor">
443<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
444<CODE>static&nbsp;void</CODE></FONT></TD>
445<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#main(java.lang.String[])">main</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;argv)</CODE>
446
447<BR>
448&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Start the TaskTracker, point toward the indicated JobTracker</TD>
449</TR>
450<TR BGCOLOR="white" CLASS="TableRowColor">
451<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
452<CODE>&nbsp;void</CODE></FONT></TD>
453<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#mapOutputLost(org.apache.hadoop.mapred.TaskAttemptID, java.lang.String)">mapOutputLost</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid,
454              <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;errorMsg)</CODE>
455
456<BR>
457&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A completed map task's output has been lost.</TD>
458</TR>
459<TR BGCOLOR="white" CLASS="TableRowColor">
460<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
461<CODE>&nbsp;boolean</CODE></FONT></TD>
462<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#ping(org.apache.hadoop.mapred.TaskAttemptID)">ping</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid)</CODE>
463
464<BR>
465&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Child checking to see if we're alive.</TD>
466</TR>
467<TR BGCOLOR="white" CLASS="TableRowColor">
468<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
469<CODE>&nbsp;void</CODE></FONT></TD>
470<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#reportDiagnosticInfo(org.apache.hadoop.mapred.TaskAttemptID, java.lang.String)">reportDiagnosticInfo</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid,
471                     <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;info)</CODE>
472
473<BR>
474&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Called when the task dies before completion, and we want to report back
475 diagnostic info</TD>
476</TR>
477<TR BGCOLOR="white" CLASS="TableRowColor">
478<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
479<CODE>&nbsp;void</CODE></FONT></TD>
480<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#reportNextRecordRange(org.apache.hadoop.mapred.TaskAttemptID, org.apache.hadoop.mapred.SortedRanges.Range)">reportNextRecordRange</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid,
481                      org.apache.hadoop.mapred.SortedRanges.Range&nbsp;range)</CODE>
482
483<BR>
484&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Report the record range which is going to process next by the Task.</TD>
485</TR>
486<TR BGCOLOR="white" CLASS="TableRowColor">
487<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
488<CODE>&nbsp;void</CODE></FONT></TD>
489<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#run()">run</A></B>()</CODE>
490
491<BR>
492&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The server retry loop.</TD>
493</TR>
494<TR BGCOLOR="white" CLASS="TableRowColor">
495<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
496<CODE>static&nbsp;void</CODE></FONT></TD>
497<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#setInstrumentationClass(org.apache.hadoop.conf.Configuration, java.lang.Class)">setInstrumentationClass</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
498                        <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends org.apache.hadoop.mapred.TaskTrackerInstrumentation&gt;&nbsp;t)</CODE>
499
500<BR>
501&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
502</TR>
503<TR BGCOLOR="white" CLASS="TableRowColor">
504<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
505<CODE>&nbsp;void</CODE></FONT></TD>
506<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#shuffleError(org.apache.hadoop.mapred.TaskAttemptID, java.lang.String)">shuffleError</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskId,
507             <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;message)</CODE>
508
509<BR>
510&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A reduce-task failed to shuffle the map-outputs.</TD>
511</TR>
512<TR BGCOLOR="white" CLASS="TableRowColor">
513<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
514<CODE>&nbsp;void</CODE></FONT></TD>
515<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#shutdown()">shutdown</A></B>()</CODE>
516
517<BR>
518&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
519</TR>
520<TR BGCOLOR="white" CLASS="TableRowColor">
521<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
522<CODE>&nbsp;boolean</CODE></FONT></TD>
523<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.html#statusUpdate(org.apache.hadoop.mapred.TaskAttemptID, org.apache.hadoop.mapred.TaskStatus)">statusUpdate</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid,
524             org.apache.hadoop.mapred.TaskStatus&nbsp;taskStatus)</CODE>
525
526<BR>
527&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Called periodically to report Task progress, from 0.0 to 1.0.</TD>
528</TR>
529</TABLE>
530&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
531<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
532<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
533<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>
534</TR>
535<TR BGCOLOR="white" CLASS="TableRowColor">
536<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>
537</TR>
538</TABLE>
539&nbsp;
540<P>
541
542<!-- ============ FIELD DETAIL =========== -->
543
544<A NAME="field_detail"><!-- --></A>
545<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
546<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
547<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
548<B>Field Detail</B></FONT></TH>
549</TR>
550</TABLE>
551
552<A NAME="LOG"><!-- --></A><H3>
553LOG</H3>
554<PRE>
555public static final org.apache.commons.logging.Log <B>LOG</B></PRE>
556<DL>
557<DL>
558</DL>
559</DL>
560<HR>
561
562<A NAME="MR_CLIENTTRACE_FORMAT"><!-- --></A><H3>
563MR_CLIENTTRACE_FORMAT</H3>
564<PRE>
565public 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>MR_CLIENTTRACE_FORMAT</B></PRE>
566<DL>
567<DL>
568<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.MR_CLIENTTRACE_FORMAT">Constant Field Values</A></DL>
569</DL>
570<HR>
571
572<A NAME="ClientTraceLog"><!-- --></A><H3>
573ClientTraceLog</H3>
574<PRE>
575public static final org.apache.commons.logging.Log <B>ClientTraceLog</B></PRE>
576<DL>
577<DL>
578</DL>
579</DL>
580<HR>
581
582<A NAME="HEARTBEAT_INTERVAL_MIN"><!-- --></A><H3>
583HEARTBEAT_INTERVAL_MIN</H3>
584<PRE>
585public static final int <B>HEARTBEAT_INTERVAL_MIN</B></PRE>
586<DL>
587<DL>
588<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.HEARTBEAT_INTERVAL_MIN">Constant Field Values</A></DL>
589</DL>
590<HR>
591
592<A NAME="CLUSTER_INCREMENT"><!-- --></A><H3>
593CLUSTER_INCREMENT</H3>
594<PRE>
595public static final int <B>CLUSTER_INCREMENT</B></PRE>
596<DL>
597<DL>
598<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.CLUSTER_INCREMENT">Constant Field Values</A></DL>
599</DL>
600<HR>
601
602<A NAME="COUNTER_UPDATE_INTERVAL"><!-- --></A><H3>
603COUNTER_UPDATE_INTERVAL</H3>
604<PRE>
605public static final long <B>COUNTER_UPDATE_INTERVAL</B></PRE>
606<DL>
607<DL>
608<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.COUNTER_UPDATE_INTERVAL">Constant Field Values</A></DL>
609</DL>
610<HR>
611
612<A NAME="SUCCESS"><!-- --></A><H3>
613SUCCESS</H3>
614<PRE>
615public static final int <B>SUCCESS</B></PRE>
616<DL>
617<DL>
618<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.SUCCESS">Constant Field Values</A></DL>
619</DL>
620<HR>
621
622<A NAME="FILE_NOT_FOUND"><!-- --></A><H3>
623FILE_NOT_FOUND</H3>
624<PRE>
625public static final int <B>FILE_NOT_FOUND</B></PRE>
626<DL>
627<DL>
628<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.FILE_NOT_FOUND">Constant Field Values</A></DL>
629</DL>
630<HR>
631
632<A NAME="MAP_OUTPUT_LENGTH"><!-- --></A><H3>
633MAP_OUTPUT_LENGTH</H3>
634<PRE>
635public 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>MAP_OUTPUT_LENGTH</B></PRE>
636<DL>
637<DD>The custom http header used for the map output length.
638<P>
639<DL>
640<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.MAP_OUTPUT_LENGTH">Constant Field Values</A></DL>
641</DL>
642<HR>
643
644<A NAME="RAW_MAP_OUTPUT_LENGTH"><!-- --></A><H3>
645RAW_MAP_OUTPUT_LENGTH</H3>
646<PRE>
647public 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>RAW_MAP_OUTPUT_LENGTH</B></PRE>
648<DL>
649<DD>The custom http header used for the "raw" map output length.
650<P>
651<DL>
652<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.RAW_MAP_OUTPUT_LENGTH">Constant Field Values</A></DL>
653</DL>
654<HR>
655
656<A NAME="FROM_MAP_TASK"><!-- --></A><H3>
657FROM_MAP_TASK</H3>
658<PRE>
659public 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>FROM_MAP_TASK</B></PRE>
660<DL>
661<DD>The map task from which the map output data is being transferred
662<P>
663<DL>
664<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.FROM_MAP_TASK">Constant Field Values</A></DL>
665</DL>
666<HR>
667
668<A NAME="FOR_REDUCE_TASK"><!-- --></A><H3>
669FOR_REDUCE_TASK</H3>
670<PRE>
671public 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>FOR_REDUCE_TASK</B></PRE>
672<DL>
673<DD>The reduce task number for which this map output is being transferred
674<P>
675<DL>
676<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.FOR_REDUCE_TASK">Constant Field Values</A></DL>
677</DL>
678<HR>
679
680<A NAME="WORKDIR"><!-- --></A><H3>
681WORKDIR</H3>
682<PRE>
683public 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>WORKDIR</B></PRE>
684<DL>
685<DL>
686<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.WORKDIR">Constant Field Values</A></DL>
687</DL>
688<HR>
689
690<A NAME="versionID"><!-- --></A><H3>
691versionID</H3>
692<PRE>
693public static final long <B>versionID</B></PRE>
694<DL>
695<DD>Changed the version to 2, since we have a new method getMapOutputs
696 Changed version to 3 to have progress() return a boolean
697 Changed the version to 4, since we have replaced
698         TaskUmbilicalProtocol.progress(String, float, String,
699         org.apache.hadoop.mapred.TaskStatus.Phase, Counters)
700         with statusUpdate(String, TaskStatus)
701 
702 Version 5 changed counters representation for HADOOP-2248
703 Version 6 changes the TaskStatus representation for HADOOP-2208
704 Version 7 changes the done api (via HADOOP-3140). It now expects whether
705           or not the task's output needs to be promoted.
706 Version 8 changes {job|tip|task}id's to use their corresponding
707 objects rather than strings.
708 Version 9 changes the counter representation for HADOOP-1915
709 Version 10 changed the TaskStatus format and added reportNextRecordRange
710            for HADOOP-153
711 Version 11 Adds RPCs for task commit as part of HADOOP-3150
712 Version 12 getMapCompletionEvents() now also indicates if the events are
713            stale or not. Hence the return type is a class that
714            encapsulates the events and whether to reset events index.
715 Version 13 changed the getTask method signature for HADOOP-249
716 Version 14 changed the getTask method signature for HADOOP-4232
717 Version 15 Adds FAILED_UNCLEAN and KILLED_UNCLEAN states for HADOOP-4759
718 Version 16 Added fatalError for child to communicate fatal errors to TT
719<P>
720<DL>
721<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapred.TaskTracker.versionID">Constant Field Values</A></DL>
722</DL>
723
724<!-- ========= CONSTRUCTOR DETAIL ======== -->
725
726<A NAME="constructor_detail"><!-- --></A>
727<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
728<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
729<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
730<B>Constructor Detail</B></FONT></TH>
731</TR>
732</TABLE>
733
734<A NAME="TaskTracker(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
735TaskTracker</H3>
736<PRE>
737public <B>TaskTracker</B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;conf)
738            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>
739<DL>
740<DD>Start with the local machine name, and the default JobTracker
741<P>
742<DL>
743
744<DT><B>Throws:</B>
745<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>
746</DL>
747
748<!-- ============ METHOD DETAIL ========== -->
749
750<A NAME="method_detail"><!-- --></A>
751<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
752<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
753<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
754<B>Method Detail</B></FONT></TH>
755</TR>
756</TABLE>
757
758<A NAME="getTaskTrackerInstrumentation()"><!-- --></A><H3>
759getTaskTrackerInstrumentation</H3>
760<PRE>
761public org.apache.hadoop.mapred.TaskTrackerInstrumentation <B>getTaskTrackerInstrumentation</B>()</PRE>
762<DL>
763<DD><DL>
764</DL>
765</DD>
766<DD><DL>
767</DL>
768</DD>
769</DL>
770<HR>
771
772<A NAME="getProtocolVersion(java.lang.String, long)"><!-- --></A><H3>
773getProtocolVersion</H3>
774<PRE>
775public long <B>getProtocolVersion</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;protocol,
776                               long&nbsp;clientVersion)
777                        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>
778<DL>
779<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/ipc/VersionedProtocol.html#getProtocolVersion(java.lang.String, long)">VersionedProtocol</A></CODE></B></DD>
780<DD>Return protocol version corresponding to protocol interface.
781<P>
782<DD><DL>
783</DL>
784</DD>
785<DD><DL>
786<DT><B>Parameters:</B><DD><CODE>protocol</CODE> - The classname of the protocol interface<DD><CODE>clientVersion</CODE> - The version of the protocol that the client speaks
787<DT><B>Returns:</B><DD>the version that the server will speak
788<DT><B>Throws:</B>
789<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>
790</DD>
791</DL>
792<HR>
793
794<A NAME="getInstrumentationClass(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
795getInstrumentationClass</H3>
796<PRE>
797public static <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends org.apache.hadoop.mapred.TaskTrackerInstrumentation&gt; <B>getInstrumentationClass</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
798<DL>
799<DD><DL>
800</DL>
801</DD>
802<DD><DL>
803</DL>
804</DD>
805</DL>
806<HR>
807
808<A NAME="setInstrumentationClass(org.apache.hadoop.conf.Configuration, java.lang.Class)"><!-- --></A><H3>
809setInstrumentationClass</H3>
810<PRE>
811public static void <B>setInstrumentationClass</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
812                                           <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends org.apache.hadoop.mapred.TaskTrackerInstrumentation&gt;&nbsp;t)</PRE>
813<DL>
814<DD><DL>
815</DL>
816</DD>
817<DD><DL>
818</DL>
819</DD>
820</DL>
821<HR>
822
823<A NAME="cleanupStorage()"><!-- --></A><H3>
824cleanupStorage</H3>
825<PRE>
826public void <B>cleanupStorage</B>()
827                    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>
828<DL>
829<DD>Removes all contents of temporary storage.  Called upon
830 startup, to remove any leftovers from previous run.
831<P>
832<DD><DL>
833</DL>
834</DD>
835<DD><DL>
836
837<DT><B>Throws:</B>
838<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>
839</DD>
840</DL>
841<HR>
842
843<A NAME="shutdown()"><!-- --></A><H3>
844shutdown</H3>
845<PRE>
846public void <B>shutdown</B>()
847              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>
848<DL>
849<DD><DL>
850</DL>
851</DD>
852<DD><DL>
853
854<DT><B>Throws:</B>
855<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>
856</DD>
857</DL>
858<HR>
859
860<A NAME="close()"><!-- --></A><H3>
861close</H3>
862<PRE>
863public void <B>close</B>()
864           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>
865<DL>
866<DD>Close down the TaskTracker and all its components.  We must also shutdown
867 any running tasks or threads, and cleanup disk space.  A new TaskTracker
868 within the same process space might be restarted, so everything must be
869 clean.
870<P>
871<DD><DL>
872</DL>
873</DD>
874<DD><DL>
875
876<DT><B>Throws:</B>
877<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>
878</DD>
879</DL>
880<HR>
881
882<A NAME="getJobClient()"><!-- --></A><H3>
883getJobClient</H3>
884<PRE>
885public org.apache.hadoop.mapred.InterTrackerProtocol <B>getJobClient</B>()</PRE>
886<DL>
887<DD>The connection to the JobTracker, used by the TaskRunner
888 for locating remote files.
889<P>
890<DD><DL>
891</DL>
892</DD>
893<DD><DL>
894</DL>
895</DD>
896</DL>
897<HR>
898
899<A NAME="getTaskTrackerReportAddress()"><!-- --></A><H3>
900getTaskTrackerReportAddress</H3>
901<PRE>
902public <A HREF="http://java.sun.com/javase/6/docs/api/java/net/InetSocketAddress.html?is-external=true" title="class or interface in java.net">InetSocketAddress</A> <B>getTaskTrackerReportAddress</B>()</PRE>
903<DL>
904<DD>Return the port at which the tasktracker bound to
905<P>
906<DD><DL>
907</DL>
908</DD>
909<DD><DL>
910</DL>
911</DD>
912</DL>
913<HR>
914
915<A NAME="getJvmManagerInstance()"><!-- --></A><H3>
916getJvmManagerInstance</H3>
917<PRE>
918public org.apache.hadoop.mapred.JvmManager <B>getJvmManagerInstance</B>()</PRE>
919<DL>
920<DD><DL>
921</DL>
922</DD>
923<DD><DL>
924</DL>
925</DD>
926</DL>
927<HR>
928
929<A NAME="run()"><!-- --></A><H3>
930run</H3>
931<PRE>
932public void <B>run</B>()</PRE>
933<DL>
934<DD>The server retry loop. 
935 This while-loop attempts to connect to the JobTracker.  It only
936 loops when the old TaskTracker has gone bad (its state is
937 stale somehow) and we need to reinitialize everything.
938<P>
939<DD><DL>
940<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true#run()" title="class or interface in java.lang">run</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</A></CODE></DL>
941</DD>
942<DD><DL>
943</DL>
944</DD>
945</DL>
946<HR>
947
948<A NAME="getTask(org.apache.hadoop.mapred.JVMId)"><!-- --></A><H3>
949getTask</H3>
950<PRE>
951public org.apache.hadoop.mapred.JvmTask <B>getTask</B>(org.apache.hadoop.mapred.JVMId&nbsp;jvmId)
952                                         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>
953<DL>
954<DD>Called upon startup by the child process, to fetch Task data.
955<P>
956<DD><DL>
957</DL>
958</DD>
959<DD><DL>
960<DT><B>Parameters:</B><DD><CODE>jvmId</CODE> - the ID of this JVM w.r.t the tasktracker that launched it
961<DT><B>Returns:</B><DD>Task object
962<DT><B>Throws:</B>
963<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>
964</DD>
965</DL>
966<HR>
967
968<A NAME="statusUpdate(org.apache.hadoop.mapred.TaskAttemptID, org.apache.hadoop.mapred.TaskStatus)"><!-- --></A><H3>
969statusUpdate</H3>
970<PRE>
971public boolean <B>statusUpdate</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid,
972                            org.apache.hadoop.mapred.TaskStatus&nbsp;taskStatus)
973                     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>
974<DL>
975<DD>Called periodically to report Task progress, from 0.0 to 1.0.
976<P>
977<DD><DL>
978</DL>
979</DD>
980<DD><DL>
981<DT><B>Parameters:</B><DD><CODE>taskid</CODE> - task-id of the child<DD><CODE>taskStatus</CODE> - status of the child
982<DT><B>Returns:</B><DD>True if the task is known
983<DT><B>Throws:</B>
984<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>
985</DD>
986</DL>
987<HR>
988
989<A NAME="reportDiagnosticInfo(org.apache.hadoop.mapred.TaskAttemptID, java.lang.String)"><!-- --></A><H3>
990reportDiagnosticInfo</H3>
991<PRE>
992public void <B>reportDiagnosticInfo</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid,
993                                 <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;info)
994                          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>
995<DL>
996<DD>Called when the task dies before completion, and we want to report back
997 diagnostic info
998<P>
999<DD><DL>
1000</DL>
1001</DD>
1002<DD><DL>
1003<DT><B>Parameters:</B><DD><CODE>taskid</CODE> - the id of the task involved<DD><CODE>info</CODE> - the text to report
1004<DT><B>Throws:</B>
1005<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>
1006</DD>
1007</DL>
1008<HR>
1009
1010<A NAME="reportNextRecordRange(org.apache.hadoop.mapred.TaskAttemptID, org.apache.hadoop.mapred.SortedRanges.Range)"><!-- --></A><H3>
1011reportNextRecordRange</H3>
1012<PRE>
1013public void <B>reportNextRecordRange</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid,
1014                                  org.apache.hadoop.mapred.SortedRanges.Range&nbsp;range)
1015                           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>
1016<DL>
1017<DD>Report the record range which is going to process next by the Task.
1018<P>
1019<DD><DL>
1020</DL>
1021</DD>
1022<DD><DL>
1023<DT><B>Parameters:</B><DD><CODE>taskid</CODE> - the id of the task involved<DD><CODE>range</CODE> - the range of record sequence nos
1024<DT><B>Throws:</B>
1025<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>
1026</DD>
1027</DL>
1028<HR>
1029
1030<A NAME="ping(org.apache.hadoop.mapred.TaskAttemptID)"><!-- --></A><H3>
1031ping</H3>
1032<PRE>
1033public boolean <B>ping</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid)
1034             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>
1035<DL>
1036<DD>Child checking to see if we're alive.  Normally does nothing.
1037<P>
1038<DD><DL>
1039</DL>
1040</DD>
1041<DD><DL>
1042
1043<DT><B>Returns:</B><DD>True if the task is known
1044<DT><B>Throws:</B>
1045<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>
1046</DD>
1047</DL>
1048<HR>
1049
1050<A NAME="commitPending(org.apache.hadoop.mapred.TaskAttemptID, org.apache.hadoop.mapred.TaskStatus)"><!-- --></A><H3>
1051commitPending</H3>
1052<PRE>
1053public void <B>commitPending</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid,
1054                          org.apache.hadoop.mapred.TaskStatus&nbsp;taskStatus)
1055                   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>
1056<DL>
1057<DD>Task is reporting that it is in commit_pending
1058 and it is waiting for the commit Response
1059<P>
1060<DD><DL>
1061</DL>
1062</DD>
1063<DD><DL>
1064<DT><B>Parameters:</B><DD><CODE>taskid</CODE> - task's id<DD><CODE>taskStatus</CODE> - status of the child
1065<DT><B>Throws:</B>
1066<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>
1067</DD>
1068</DL>
1069<HR>
1070
1071<A NAME="canCommit(org.apache.hadoop.mapred.TaskAttemptID)"><!-- --></A><H3>
1072canCommit</H3>
1073<PRE>
1074public boolean <B>canCommit</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid)</PRE>
1075<DL>
1076<DD>Child checking whether it can commit
1077<P>
1078<DD><DL>
1079</DL>
1080</DD>
1081<DD><DL>
1082
1083<DT><B>Returns:</B><DD>true/false</DL>
1084</DD>
1085</DL>
1086<HR>
1087
1088<A NAME="done(org.apache.hadoop.mapred.TaskAttemptID)"><!-- --></A><H3>
1089done</H3>
1090<PRE>
1091public void <B>done</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid)
1092          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>
1093<DL>
1094<DD>The task is done.
1095<P>
1096<DD><DL>
1097</DL>
1098</DD>
1099<DD><DL>
1100<DT><B>Parameters:</B><DD><CODE>taskid</CODE> - task's id
1101<DT><B>Throws:</B>
1102<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>
1103</DD>
1104</DL>
1105<HR>
1106
1107<A NAME="shuffleError(org.apache.hadoop.mapred.TaskAttemptID, java.lang.String)"><!-- --></A><H3>
1108shuffleError</H3>
1109<PRE>
1110public void <B>shuffleError</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskId,
1111                         <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;message)
1112                  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>
1113<DL>
1114<DD>A reduce-task failed to shuffle the map-outputs. Kill the task.
1115<P>
1116<DD><DL>
1117</DL>
1118</DD>
1119<DD><DL>
1120
1121<DT><B>Throws:</B>
1122<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>
1123</DD>
1124</DL>
1125<HR>
1126
1127<A NAME="fsError(org.apache.hadoop.mapred.TaskAttemptID, java.lang.String)"><!-- --></A><H3>
1128fsError</H3>
1129<PRE>
1130public void <B>fsError</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskId,
1131                    <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;message)
1132             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>
1133<DL>
1134<DD>A child task had a local filesystem error. Kill the task.
1135<P>
1136<DD><DL>
1137</DL>
1138</DD>
1139<DD><DL>
1140
1141<DT><B>Throws:</B>
1142<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>
1143</DD>
1144</DL>
1145<HR>
1146
1147<A NAME="fatalError(org.apache.hadoop.mapred.TaskAttemptID, java.lang.String)"><!-- --></A><H3>
1148fatalError</H3>
1149<PRE>
1150public void <B>fatalError</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskId,
1151                       <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;msg)
1152                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>
1153<DL>
1154<DD>A child task had a fatal error. Kill the task.
1155<P>
1156<DD><DL>
1157</DL>
1158</DD>
1159<DD><DL>
1160
1161<DT><B>Throws:</B>
1162<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>
1163</DD>
1164</DL>
1165<HR>
1166
1167<A NAME="getMapCompletionEvents(org.apache.hadoop.mapred.JobID, int, int, org.apache.hadoop.mapred.TaskAttemptID)"><!-- --></A><H3>
1168getMapCompletionEvents</H3>
1169<PRE>
1170public org.apache.hadoop.mapred.MapTaskCompletionEventsUpdate <B>getMapCompletionEvents</B>(<A HREF="../../../../org/apache/hadoop/mapred/JobID.html" title="class in org.apache.hadoop.mapred">JobID</A>&nbsp;jobId,
1171                                                                                     int&nbsp;fromEventId,
1172                                                                                     int&nbsp;maxLocs,
1173                                                                                     <A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;id)
1174                                                                              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>
1175<DL>
1176<DD>Called by a reduce task to get the map output locations for finished maps.
1177 Returns an update centered around the map-task-completion-events.
1178 The update also piggybacks the information whether the events copy at the
1179 task-tracker has changed or not. This will trigger some action at the
1180 child-process.
1181<P>
1182<DD><DL>
1183</DL>
1184</DD>
1185<DD><DL>
1186<DD><CODE>fromEventId</CODE> - the index starting from which the locations should be
1187 fetched<DD><CODE>maxLocs</CODE> - the max number of locations to fetch<DD><CODE>id</CODE> - The attempt id of the task that is trying to communicate
1188<DT><B>Returns:</B><DD>A <CODE>MapTaskCompletionEventsUpdate</CODE>
1189<DT><B>Throws:</B>
1190<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>
1191</DD>
1192</DL>
1193<HR>
1194
1195<A NAME="mapOutputLost(org.apache.hadoop.mapred.TaskAttemptID, java.lang.String)"><!-- --></A><H3>
1196mapOutputLost</H3>
1197<PRE>
1198public void <B>mapOutputLost</B>(<A HREF="../../../../org/apache/hadoop/mapred/TaskAttemptID.html" title="class in org.apache.hadoop.mapred">TaskAttemptID</A>&nbsp;taskid,
1199                          <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;errorMsg)
1200                   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>
1201<DL>
1202<DD>A completed map task's output has been lost.
1203<P>
1204<DD><DL>
1205</DL>
1206</DD>
1207<DD><DL>
1208
1209<DT><B>Throws:</B>
1210<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>
1211</DD>
1212</DL>
1213<HR>
1214
1215<A NAME="isIdle()"><!-- --></A><H3>
1216isIdle</H3>
1217<PRE>
1218public boolean <B>isIdle</B>()</PRE>
1219<DL>
1220<DD>Is this task tracker idle?
1221<P>
1222<DD><DL>
1223</DL>
1224</DD>
1225<DD><DL>
1226
1227<DT><B>Returns:</B><DD>has this task tracker finished and cleaned up all of its tasks?</DL>
1228</DD>
1229</DL>
1230<HR>
1231
1232<A NAME="main(java.lang.String[])"><!-- --></A><H3>
1233main</H3>
1234<PRE>
1235public static void <B>main</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;argv)
1236                 throws <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></PRE>
1237<DL>
1238<DD>Start the TaskTracker, point toward the indicated JobTracker
1239<P>
1240<DD><DL>
1241</DL>
1242</DD>
1243<DD><DL>
1244
1245<DT><B>Throws:</B>
1246<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></CODE></DL>
1247</DD>
1248</DL>
1249<HR>
1250
1251<A NAME="isTaskMemoryManagerEnabled()"><!-- --></A><H3>
1252isTaskMemoryManagerEnabled</H3>
1253<PRE>
1254public boolean <B>isTaskMemoryManagerEnabled</B>()</PRE>
1255<DL>
1256<DD>Is the TaskMemoryManager Enabled on this system?
1257<P>
1258<DD><DL>
1259</DL>
1260</DD>
1261<DD><DL>
1262
1263<DT><B>Returns:</B><DD>true if enabled, false otherwise.</DL>
1264</DD>
1265</DL>
1266<HR>
1267
1268<A NAME="getTaskMemoryManager()"><!-- --></A><H3>
1269getTaskMemoryManager</H3>
1270<PRE>
1271public org.apache.hadoop.mapred.TaskMemoryManagerThread <B>getTaskMemoryManager</B>()</PRE>
1272<DL>
1273<DD><DL>
1274</DL>
1275</DD>
1276<DD><DL>
1277</DL>
1278</DD>
1279</DL>
1280<!-- ========= END OF CLASS DATA ========= -->
1281<HR>
1282
1283
1284<!-- ======= START OF BOTTOM NAVBAR ====== -->
1285<A NAME="navbar_bottom"><!-- --></A>
1286<A HREF="#skip-navbar_bottom" title="Skip navigation links"></A>
1287<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY="">
1288<TR>
1289<TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1">
1290<A NAME="navbar_bottom_firstrow"><!-- --></A>
1291<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">
1292  <TR ALIGN="center" VALIGN="top">
1293  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
1294  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>
1295  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT>&nbsp;</TD>
1296  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/TaskTracker.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
1297  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
1298  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>
1299  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A>&nbsp;</TD>
1300  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A>&nbsp;</TD>
1301  </TR>
1302</TABLE>
1303</TD>
1304<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
1305</EM>
1306</TD>
1307</TR>
1308
1309<TR>
1310<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
1311&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/TaskReport.html" title="class in org.apache.hadoop.mapred"><B>PREV CLASS</B></A>&nbsp;
1312&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/TaskTracker.MapOutputServlet.html" title="class in org.apache.hadoop.mapred"><B>NEXT CLASS</B></A></FONT></TD>
1313<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
1314  <A HREF="../../../../index.html?org/apache/hadoop/mapred/TaskTracker.html" target="_top"><B>FRAMES</B></A>  &nbsp;
1315&nbsp;<A HREF="TaskTracker.html" target="_top"><B>NO FRAMES</B></A>  &nbsp;
1316&nbsp;<SCRIPT type="text/javascript">
1317  <!--
1318  if(window==top) {
1319    document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>');
1320  }
1321  //-->
1322</SCRIPT>
1323<NOSCRIPT>
1324  <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>
1325</NOSCRIPT>
1326
1327
1328</FONT></TD>
1329</TR>
1330<TR>
1331<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
1332  SUMMARY:&nbsp;<A HREF="#nested_class_summary">NESTED</A>&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
1333<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
1334DETAIL:&nbsp;<A HREF="#field_detail">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_detail">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_detail">METHOD</A></FONT></TD>
1335</TR>
1336</TABLE>
1337<A NAME="skip-navbar_bottom"></A>
1338<!-- ======== END OF BOTTOM NAVBAR ======= -->
1339
1340<HR>
1341Copyright &copy; 2009 The Apache Software Foundation
1342</BODY>
1343</HTML>
Note: See TracBrowser for help on using the repository browser.