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7Counters.Group (Hadoop 0.20.1 API)
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89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.mapred</FONT>
92<BR>
93Class Counters.Group</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.Counters.Group</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/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</A>&lt;<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A>&gt;, <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>Enclosing class:</B><DD><A HREF="../../../../org/apache/hadoop/mapred/Counters.html" title="class in org.apache.hadoop.mapred">Counters</A></DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>public static class <B>Counters.Group</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>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</A>&lt;<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A>&gt;</DL>
107</PRE>
108
109<P>
110<code>Group</code> of counters, comprising of counters from a particular
111  counter <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> class. 
112
113  <p><code>Group</code>handles localization of the class name and the
114  counter names.</p>
115<P>
116
117<P>
118<HR>
119
120<P>
121
122<!-- ========== METHOD SUMMARY =========== -->
123
124<A NAME="method_summary"><!-- --></A>
125<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
126<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
127<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
128<B>Method Summary</B></FONT></TH>
129</TR>
130<TR BGCOLOR="white" CLASS="TableRowColor">
131<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
132<CODE>&nbsp;boolean</CODE></FONT></TD>
133<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.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;obj)</CODE>
134
135<BR>
136&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Checks for (content) equality of Groups</TD>
137</TR>
138<TR BGCOLOR="white" CLASS="TableRowColor">
139<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
140<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A></CODE></FONT></TD>
141<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#getCounter(int, java.lang.String)">getCounter</A></B>(int&nbsp;id,
142           <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)</CODE>
143
144<BR>
145&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I>use <A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#getCounter(java.lang.String)"><CODE>getCounter(String)</CODE></A> instead</I></TD>
146</TR>
147<TR BGCOLOR="white" CLASS="TableRowColor">
148<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
149<CODE>&nbsp;long</CODE></FONT></TD>
150<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#getCounter(java.lang.String)">getCounter</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;counterName)</CODE>
151
152<BR>
153&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the value of the specified counter, or 0 if the counter does
154 not exist.</TD>
155</TR>
156<TR BGCOLOR="white" CLASS="TableRowColor">
157<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
158<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A></CODE></FONT></TD>
159<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#getCounterForName(java.lang.String)">getCounterForName</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)</CODE>
160
161<BR>
162&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the counter for the given name and create it if it doesn't exist.</TD>
163</TR>
164<TR BGCOLOR="white" CLASS="TableRowColor">
165<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
166<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>
167<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#getDisplayName()">getDisplayName</A></B>()</CODE>
168
169<BR>
170&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns localized name of the group.</TD>
171</TR>
172<TR BGCOLOR="white" CLASS="TableRowColor">
173<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
174<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>
175<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#getName()">getName</A></B>()</CODE>
176
177<BR>
178&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns raw name of the group.</TD>
179</TR>
180<TR BGCOLOR="white" CLASS="TableRowColor">
181<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
182<CODE>&nbsp;int</CODE></FONT></TD>
183<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#hashCode()">hashCode</A></B>()</CODE>
184
185<BR>
186&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
187</TR>
188<TR BGCOLOR="white" CLASS="TableRowColor">
189<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
190<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A>&lt;<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A>&gt;</CODE></FONT></TD>
191<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#iterator()">iterator</A></B>()</CODE>
192
193<BR>
194&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
195</TR>
196<TR BGCOLOR="white" CLASS="TableRowColor">
197<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
198<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>
199<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#makeEscapedCompactString()">makeEscapedCompactString</A></B>()</CODE>
200
201<BR>
202&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the compact stringified version of the group in the format
203 {(actual-name)(display-name)(value)[][][]} where [] are compact strings for the
204 counters within.</TD>
205</TR>
206<TR BGCOLOR="white" CLASS="TableRowColor">
207<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
208<CODE>&nbsp;void</CODE></FONT></TD>
209<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.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>
210
211<BR>
212&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deserialize the fields of this object from <code>in</code>.</TD>
213</TR>
214<TR BGCOLOR="white" CLASS="TableRowColor">
215<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
216<CODE>&nbsp;void</CODE></FONT></TD>
217<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.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>
218
219<BR>
220&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the display name</TD>
221</TR>
222<TR BGCOLOR="white" CLASS="TableRowColor">
223<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
224<CODE>&nbsp;int</CODE></FONT></TD>
225<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#size()">size</A></B>()</CODE>
226
227<BR>
228&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the number of counters in this group.</TD>
229</TR>
230<TR BGCOLOR="white" CLASS="TableRowColor">
231<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
232<CODE>&nbsp;void</CODE></FONT></TD>
233<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.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>
234
235<BR>
236&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Serialize the fields of this object to <code>out</code>.</TD>
237</TR>
238</TABLE>
239&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
240<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
241<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
242<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>
243</TR>
244<TR BGCOLOR="white" CLASS="TableRowColor">
245<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>
246</TR>
247</TABLE>
248&nbsp;
249<P>
250
251<!-- ============ METHOD DETAIL ========== -->
252
253<A NAME="method_detail"><!-- --></A>
254<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
255<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
256<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
257<B>Method Detail</B></FONT></TH>
258</TR>
259</TABLE>
260
261<A NAME="getName()"><!-- --></A><H3>
262getName</H3>
263<PRE>
264public <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>
265<DL>
266<DD>Returns raw name of the group.  This is the name of the enum class
267 for this group of counters.
268<P>
269<DD><DL>
270</DL>
271</DD>
272<DD><DL>
273</DL>
274</DD>
275</DL>
276<HR>
277
278<A NAME="getDisplayName()"><!-- --></A><H3>
279getDisplayName</H3>
280<PRE>
281public <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>
282<DL>
283<DD>Returns localized name of the group.  This is the same as getName() by
284 default, but different if an appropriate ResourceBundle is found.
285<P>
286<DD><DL>
287</DL>
288</DD>
289<DD><DL>
290</DL>
291</DD>
292</DL>
293<HR>
294
295<A NAME="setDisplayName(java.lang.String)"><!-- --></A><H3>
296setDisplayName</H3>
297<PRE>
298public 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>
299<DL>
300<DD>Set the display name
301<P>
302<DD><DL>
303</DL>
304</DD>
305<DD><DL>
306</DL>
307</DD>
308</DL>
309<HR>
310
311<A NAME="makeEscapedCompactString()"><!-- --></A><H3>
312makeEscapedCompactString</H3>
313<PRE>
314public <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>makeEscapedCompactString</B>()</PRE>
315<DL>
316<DD>Returns the compact stringified version of the group in the format
317 {(actual-name)(display-name)(value)[][][]} where [] are compact strings for the
318 counters within.
319<P>
320<DD><DL>
321</DL>
322</DD>
323<DD><DL>
324</DL>
325</DD>
326</DL>
327<HR>
328
329<A NAME="hashCode()"><!-- --></A><H3>
330hashCode</H3>
331<PRE>
332public int <B>hashCode</B>()</PRE>
333<DL>
334<DD><DL>
335<DT><B>Overrides:</B><DD><CODE><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></CODE> in class <CODE><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></CODE></DL>
336</DD>
337<DD><DL>
338</DL>
339</DD>
340</DL>
341<HR>
342
343<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
344equals</H3>
345<PRE>
346public 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;obj)</PRE>
347<DL>
348<DD>Checks for (content) equality of Groups
349<P>
350<DD><DL>
351<DT><B>Overrides:</B><DD><CODE><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></CODE> in class <CODE><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></CODE></DL>
352</DD>
353<DD><DL>
354</DL>
355</DD>
356</DL>
357<HR>
358
359<A NAME="getCounter(java.lang.String)"><!-- --></A><H3>
360getCounter</H3>
361<PRE>
362public long <B>getCounter</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;counterName)</PRE>
363<DL>
364<DD>Returns the value of the specified counter, or 0 if the counter does
365 not exist.
366<P>
367<DD><DL>
368</DL>
369</DD>
370<DD><DL>
371</DL>
372</DD>
373</DL>
374<HR>
375
376<A NAME="getCounter(int, java.lang.String)"><!-- --></A><H3>
377getCounter</H3>
378<PRE>
379<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>
380</FONT>public <A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A> <B>getCounter</B>(int&nbsp;id,
381                                              <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)</PRE>
382<DL>
383<DD><B>Deprecated.</B>&nbsp;<I>use <A HREF="../../../../org/apache/hadoop/mapred/Counters.Group.html#getCounter(java.lang.String)"><CODE>getCounter(String)</CODE></A> instead</I>
384<P>
385<DD>Get the counter for the given id and create it if it doesn't exist.
386<P>
387<DD><DL>
388</DL>
389</DD>
390<DD><DL>
391<DT><B>Parameters:</B><DD><CODE>id</CODE> - the numeric id of the counter within the group<DD><CODE>name</CODE> - the internal counter name
392<DT><B>Returns:</B><DD>the counter</DL>
393</DD>
394</DL>
395<HR>
396
397<A NAME="getCounterForName(java.lang.String)"><!-- --></A><H3>
398getCounterForName</H3>
399<PRE>
400public <A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A> <B>getCounterForName</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)</PRE>
401<DL>
402<DD>Get the counter for the given name and create it if it doesn't exist.
403<P>
404<DD><DL>
405</DL>
406</DD>
407<DD><DL>
408<DT><B>Parameters:</B><DD><CODE>name</CODE> - the internal counter name
409<DT><B>Returns:</B><DD>the counter</DL>
410</DD>
411</DL>
412<HR>
413
414<A NAME="size()"><!-- --></A><H3>
415size</H3>
416<PRE>
417public int <B>size</B>()</PRE>
418<DL>
419<DD>Returns the number of counters in this group.
420<P>
421<DD><DL>
422</DL>
423</DD>
424<DD><DL>
425</DL>
426</DD>
427</DL>
428<HR>
429
430<A NAME="write(java.io.DataOutput)"><!-- --></A><H3>
431write</H3>
432<PRE>
433public 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)
434           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>
435<DL>
436<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">Writable</A></CODE></B></DD>
437<DD>Serialize the fields of this object to <code>out</code>.
438<P>
439<DD><DL>
440<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>
441</DD>
442<DD><DL>
443<DT><B>Parameters:</B><DD><CODE>out</CODE> - <code>DataOuput</code> to serialize this object into.
444<DT><B>Throws:</B>
445<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>
446</DD>
447</DL>
448<HR>
449
450<A NAME="readFields(java.io.DataInput)"><!-- --></A><H3>
451readFields</H3>
452<PRE>
453public 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)
454                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>
455<DL>
456<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">Writable</A></CODE></B></DD>
457<DD>Deserialize the fields of this object from <code>in</code>. 
458 
459 <p>For efficiency, implementations should attempt to re-use storage in the
460 existing object where possible.</p>
461<P>
462<DD><DL>
463<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>
464</DD>
465<DD><DL>
466<DT><B>Parameters:</B><DD><CODE>in</CODE> - <code>DataInput</code> to deseriablize this object from.
467<DT><B>Throws:</B>
468<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>
469</DD>
470</DL>
471<HR>
472
473<A NAME="iterator()"><!-- --></A><H3>
474iterator</H3>
475<PRE>
476public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A>&lt;<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A>&gt; <B>iterator</B>()</PRE>
477<DL>
478<DD><DL>
479<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true#iterator()" title="class or interface in java.lang">iterator</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</A>&lt;<A HREF="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</A>&gt;</CODE></DL>
480</DD>
481<DD><DL>
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