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

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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 20:56:58 UTC 2009 -->
6<TITLE>
7Counter (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="Counter (Hadoop 0.20.1 API)";
19    }
20}
21</SCRIPT>
22<NOSCRIPT>
23</NOSCRIPT>
24
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26
27<BODY BGCOLOR="white" onload="windowTitle();">
28<HR>
29
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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>
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43  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/Counter.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
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45  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>
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58&nbsp;PREV CLASS&nbsp;
59&nbsp;<A HREF="../../../../org/apache/hadoop/mapreduce/CounterGroup.html" title="class in org.apache.hadoop.mapreduce"><B>NEXT CLASS</B></A></FONT></TD>
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61  <A HREF="../../../../index.html?org/apache/hadoop/mapreduce/Counter.html" target="_top"><B>FRAMES</B></A>  &nbsp;
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63&nbsp;<SCRIPT type="text/javascript">
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74
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76</TR>
77<TR>
78<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
79  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;FIELD&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;FIELD&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.mapreduce</FONT>
92<BR>
93Class Counter</H2>
94<PRE>
95<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
96  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapreduce.Counter</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></DD>
100</DL>
101<DL>
102<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A></DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>public class <B>Counter</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="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></DL>
107</PRE>
108
109<P>
110A named counter that tracks the progress of a map/reduce job.
111 
112 <p><code>Counters</code> represent global counters, defined either by the
113 Map-Reduce framework or applications. Each <code>Counter</code> is named by
114 an <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang"><CODE>Enum</CODE></A> and has a long for the value.</p>
115 
116 <p><code>Counters</code> are bunched into Groups, each comprising of
117 counters from a particular <code>Enum</code> class.
118<P>
119
120<P>
121<HR>
122
123<P>
124
125<!-- ======== CONSTRUCTOR SUMMARY ======== -->
126
127<A NAME="constructor_summary"><!-- --></A>
128<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
129<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
130<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
131<B>Constructor Summary</B></FONT></TH>
132</TR>
133<TR BGCOLOR="white" CLASS="TableRowColor">
134<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
135<CODE>protected </CODE></FONT></TD>
136<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#Counter()">Counter</A></B>()</CODE>
137
138<BR>
139&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
140</TR>
141<TR BGCOLOR="white" CLASS="TableRowColor">
142<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
143<CODE>protected </CODE></FONT></TD>
144<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#Counter(java.lang.String, java.lang.String)">Counter</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;name,
145        <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;displayName)</CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
149</TR>
150</TABLE>
151&nbsp;
152<!-- ========== METHOD SUMMARY =========== -->
153
154<A NAME="method_summary"><!-- --></A>
155<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
156<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
157<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
158<B>Method Summary</B></FONT></TH>
159</TR>
160<TR BGCOLOR="white" CLASS="TableRowColor">
161<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
162<CODE>&nbsp;boolean</CODE></FONT></TD>
163<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#equals(java.lang.Object)">equals</A></B>(<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>&nbsp;genericRight)</CODE>
164
165<BR>
166&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
167</TR>
168<TR BGCOLOR="white" CLASS="TableRowColor">
169<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
170<CODE>&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>
171<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#getDisplayName()">getDisplayName</A></B>()</CODE>
172
173<BR>
174&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the name of the counter.</TD>
175</TR>
176<TR BGCOLOR="white" CLASS="TableRowColor">
177<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
178<CODE>&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>
179<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#getName()">getName</A></B>()</CODE>
180
181<BR>
182&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
183</TR>
184<TR BGCOLOR="white" CLASS="TableRowColor">
185<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
186<CODE>&nbsp;long</CODE></FONT></TD>
187<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#getValue()">getValue</A></B>()</CODE>
188
189<BR>
190&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;What is the current value of this counter?</TD>
191</TR>
192<TR BGCOLOR="white" CLASS="TableRowColor">
193<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
194<CODE>&nbsp;int</CODE></FONT></TD>
195<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#hashCode()">hashCode</A></B>()</CODE>
196
197<BR>
198&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
199</TR>
200<TR BGCOLOR="white" CLASS="TableRowColor">
201<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
202<CODE>&nbsp;void</CODE></FONT></TD>
203<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#increment(long)">increment</A></B>(long&nbsp;incr)</CODE>
204
205<BR>
206&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Increment this counter by the given value</TD>
207</TR>
208<TR BGCOLOR="white" CLASS="TableRowColor">
209<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
210<CODE>&nbsp;void</CODE></FONT></TD>
211<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#readFields(java.io.DataInput)">readFields</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A>&nbsp;in)</CODE>
212
213<BR>
214&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read the binary representation of the counter</TD>
215</TR>
216<TR BGCOLOR="white" CLASS="TableRowColor">
217<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
218<CODE>protected &nbsp;void</CODE></FONT></TD>
219<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#setDisplayName(java.lang.String)">setDisplayName</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;displayName)</CODE>
220
221<BR>
222&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;</TD>
223</TR>
224<TR BGCOLOR="white" CLASS="TableRowColor">
225<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
226<CODE>&nbsp;void</CODE></FONT></TD>
227<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/Counter.html#write(java.io.DataOutput)">write</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</A>&nbsp;out)</CODE>
228
229<BR>
230&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Write the binary representation of the counter</TD>
231</TR>
232</TABLE>
233&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
234<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
235<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
236<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>
237</TR>
238<TR BGCOLOR="white" CLASS="TableRowColor">
239<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#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#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>
240</TR>
241</TABLE>
242&nbsp;
243<P>
244
245<!-- ========= CONSTRUCTOR DETAIL ======== -->
246
247<A NAME="constructor_detail"><!-- --></A>
248<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
249<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
250<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
251<B>Constructor Detail</B></FONT></TH>
252</TR>
253</TABLE>
254
255<A NAME="Counter()"><!-- --></A><H3>
256Counter</H3>
257<PRE>
258protected <B>Counter</B>()</PRE>
259<DL>
260</DL>
261<HR>
262
263<A NAME="Counter(java.lang.String, java.lang.String)"><!-- --></A><H3>
264Counter</H3>
265<PRE>
266protected <B>Counter</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;name,
267                  <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;displayName)</PRE>
268<DL>
269</DL>
270
271<!-- ============ METHOD DETAIL ========== -->
272
273<A NAME="method_detail"><!-- --></A>
274<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
275<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
276<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
277<B>Method Detail</B></FONT></TH>
278</TR>
279</TABLE>
280
281<A NAME="setDisplayName(java.lang.String)"><!-- --></A><H3>
282setDisplayName</H3>
283<PRE>
284<FONT SIZE="-1"><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</A>
285</FONT>protected void <B>setDisplayName</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;displayName)</PRE>
286<DL>
287<DD><B>Deprecated.</B>&nbsp;
288<P>
289<DD><DL>
290</DL>
291</DD>
292<DD><DL>
293</DL>
294</DD>
295</DL>
296<HR>
297
298<A NAME="readFields(java.io.DataInput)"><!-- --></A><H3>
299readFields</H3>
300<PRE>
301public void <B>readFields</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A>&nbsp;in)
302                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>
303<DL>
304<DD>Read the binary representation of the counter
305<P>
306<DD><DL>
307<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">readFields</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></DL>
308</DD>
309<DD><DL>
310<DT><B>Parameters:</B><DD><CODE>in</CODE> - <code>DataInput</code> to deseriablize this object from.
311<DT><B>Throws:</B>
312<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>
313</DD>
314</DL>
315<HR>
316
317<A NAME="write(java.io.DataOutput)"><!-- --></A><H3>
318write</H3>
319<PRE>
320public void <B>write</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</A>&nbsp;out)
321           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>
322<DL>
323<DD>Write the binary representation of the counter
324<P>
325<DD><DL>
326<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">write</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></DL>
327</DD>
328<DD><DL>
329<DT><B>Parameters:</B><DD><CODE>out</CODE> - <code>DataOuput</code> to serialize this object into.
330<DT><B>Throws:</B>
331<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>
332</DD>
333</DL>
334<HR>
335
336<A NAME="getName()"><!-- --></A><H3>
337getName</H3>
338<PRE>
339public <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>getName</B>()</PRE>
340<DL>
341<DD><DL>
342</DL>
343</DD>
344<DD><DL>
345</DL>
346</DD>
347</DL>
348<HR>
349
350<A NAME="getDisplayName()"><!-- --></A><H3>
351getDisplayName</H3>
352<PRE>
353public <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>getDisplayName</B>()</PRE>
354<DL>
355<DD>Get the name of the counter.
356<P>
357<DD><DL>
358</DL>
359</DD>
360<DD><DL>
361
362<DT><B>Returns:</B><DD>the user facing name of the counter</DL>
363</DD>
364</DL>
365<HR>
366
367<A NAME="getValue()"><!-- --></A><H3>
368getValue</H3>
369<PRE>
370public long <B>getValue</B>()</PRE>
371<DL>
372<DD>What is the current value of this counter?
373<P>
374<DD><DL>
375</DL>
376</DD>
377<DD><DL>
378
379<DT><B>Returns:</B><DD>the current value</DL>
380</DD>
381</DL>
382<HR>
383
384<A NAME="increment(long)"><!-- --></A><H3>
385increment</H3>
386<PRE>
387public void <B>increment</B>(long&nbsp;incr)</PRE>
388<DL>
389<DD>Increment this counter by the given value
390<P>
391<DD><DL>
392</DL>
393</DD>
394<DD><DL>
395<DT><B>Parameters:</B><DD><CODE>incr</CODE> - the value to increase this counter by</DL>
396</DD>
397</DL>
398<HR>
399
400<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
401equals</H3>
402<PRE>
403public boolean <B>equals</B>(<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>&nbsp;genericRight)</PRE>
404<DL>
405<DD><DL>
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