source: proiecte/HadoopJUnit/hadoop-0.20.1/docs/api/org/apache/hadoop/io/class-use/NullWritable.html @ 120

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3<HTML>
4<HEAD>
5<!-- Generated by javadoc (build 1.6.0_07) on Tue Sep 01 20:57:01 UTC 2009 -->
6<TITLE>
7Uses of Class org.apache.hadoop.io.NullWritable (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">
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18        parent.document.title="Uses of Class org.apache.hadoop.io.NullWritable (Hadoop 0.20.1 API)";
19    }
20}
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31<!-- ========= START OF TOP NAVBAR ======= -->
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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>
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43  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Use</B></FONT>&nbsp;</TD>
44  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
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55
56<TR>
57<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
58&nbsp;PREV&nbsp;
59&nbsp;NEXT</FONT></TD>
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80
81<HR>
82<CENTER>
83<H2>
84<B>Uses of Class<br>org.apache.hadoop.io.NullWritable</B></H2>
85</CENTER>
86
87<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
88<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
89<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
90Packages that use <A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A></FONT></TH>
91</TR>
92<TR BGCOLOR="white" CLASS="TableRowColor">
93<TD><A HREF="#org.apache.hadoop.examples"><B>org.apache.hadoop.examples</B></A></TD>
94<TD>Hadoop example code.&nbsp;</TD>
95</TR>
96<TR BGCOLOR="white" CLASS="TableRowColor">
97<TD><A HREF="#org.apache.hadoop.examples.terasort"><B>org.apache.hadoop.examples.terasort</B></A></TD>
98<TD>This package consists of 3 map/reduce applications for Hadoop to
99compete in the annual <a
100href="http://www.hpl.hp.com/hosted/sortbenchmark" target="_top">terabyte sort</a>
101competition.&nbsp;</TD>
102</TR>
103<TR BGCOLOR="white" CLASS="TableRowColor">
104<TD><A HREF="#org.apache.hadoop.io"><B>org.apache.hadoop.io</B></A></TD>
105<TD>Generic i/o code for use when reading and writing data to the network,
106to databases, and to files.&nbsp;</TD>
107</TR>
108</TABLE>
109&nbsp;
110<P>
111<A NAME="org.apache.hadoop.examples"><!-- --></A>
112<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
113<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
114<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
115Uses of <A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A> in <A HREF="../../../../../org/apache/hadoop/examples/package-summary.html">org.apache.hadoop.examples</A></FONT></TH>
116</TR>
117</TABLE>
118&nbsp;
119<P>
120
121<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
122<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
123<TH ALIGN="left" COLSPAN="2">Methods in <A HREF="../../../../../org/apache/hadoop/examples/package-summary.html">org.apache.hadoop.examples</A> with parameters of type <A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A></FONT></TH>
124</TR>
125<TR BGCOLOR="white" CLASS="TableRowColor">
126<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
127<CODE>&nbsp;int</CODE></FONT></TD>
128<TD><CODE><B>SleepJob.</B><B><A HREF="../../../../../org/apache/hadoop/examples/SleepJob.html#getPartition(org.apache.hadoop.io.IntWritable, org.apache.hadoop.io.NullWritable, int)">getPartition</A></B>(<A HREF="../../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&nbsp;k,
129             <A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>&nbsp;v,
130             int&nbsp;numPartitions)</CODE>
131
132<BR>
133&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
134</TR>
135</TABLE>
136&nbsp;
137<P>
138
139<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
140<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
141<TH ALIGN="left" COLSPAN="2">Method parameters in <A HREF="../../../../../org/apache/hadoop/examples/package-summary.html">org.apache.hadoop.examples</A> with type arguments of type <A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A></FONT></TH>
142</TR>
143<TR BGCOLOR="white" CLASS="TableRowColor">
144<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
145<CODE>&nbsp;void</CODE></FONT></TD>
146<TD><CODE><B>SleepJob.</B><B><A HREF="../../../../../org/apache/hadoop/examples/SleepJob.html#map(org.apache.hadoop.io.IntWritable, org.apache.hadoop.io.IntWritable, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">map</A></B>(<A HREF="../../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&nbsp;key,
147    <A HREF="../../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&nbsp;value,
148    <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&lt;<A HREF="../../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>,<A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>&gt;&nbsp;output,
149    <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
150
151<BR>
152&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
153</TR>
154<TR BGCOLOR="white" CLASS="TableRowColor">
155<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
156<CODE>&nbsp;void</CODE></FONT></TD>
157<TD><CODE><B>SleepJob.</B><B><A HREF="../../../../../org/apache/hadoop/examples/SleepJob.html#reduce(org.apache.hadoop.io.IntWritable, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">reduce</A></B>(<A HREF="../../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&nbsp;key,
158       <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/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>&gt;&nbsp;values,
159       <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&lt;<A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>,<A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>&gt;&nbsp;output,
160       <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
161
162<BR>
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
164</TR>
165<TR BGCOLOR="white" CLASS="TableRowColor">
166<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
167<CODE>&nbsp;void</CODE></FONT></TD>
168<TD><CODE><B>SleepJob.</B><B><A HREF="../../../../../org/apache/hadoop/examples/SleepJob.html#reduce(org.apache.hadoop.io.IntWritable, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">reduce</A></B>(<A HREF="../../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&nbsp;key,
169       <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/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>&gt;&nbsp;values,
170       <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&lt;<A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>,<A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>&gt;&nbsp;output,
171       <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
172
173<BR>
174&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
175</TR>
176<TR BGCOLOR="white" CLASS="TableRowColor">
177<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
178<CODE>&nbsp;void</CODE></FONT></TD>
179<TD><CODE><B>SleepJob.</B><B><A HREF="../../../../../org/apache/hadoop/examples/SleepJob.html#reduce(org.apache.hadoop.io.IntWritable, java.util.Iterator, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">reduce</A></B>(<A HREF="../../../../../org/apache/hadoop/io/IntWritable.html" title="class in org.apache.hadoop.io">IntWritable</A>&nbsp;key,
180       <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/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>&gt;&nbsp;values,
181       <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&lt;<A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>,<A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>&gt;&nbsp;output,
182       <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
183
184<BR>
185&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
186</TR>
187</TABLE>
188&nbsp;
189<P>
190<A NAME="org.apache.hadoop.examples.terasort"><!-- --></A>
191<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
192<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
193<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
194Uses of <A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A> in <A HREF="../../../../../org/apache/hadoop/examples/terasort/package-summary.html">org.apache.hadoop.examples.terasort</A></FONT></TH>
195</TR>
196</TABLE>
197&nbsp;
198<P>
199
200<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
201<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
202<TH ALIGN="left" COLSPAN="2">Methods in <A HREF="../../../../../org/apache/hadoop/examples/terasort/package-summary.html">org.apache.hadoop.examples.terasort</A> with parameters of type <A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A></FONT></TH>
203</TR>
204<TR BGCOLOR="white" CLASS="TableRowColor">
205<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
206<CODE>&nbsp;void</CODE></FONT></TD>
207<TD><CODE><B>TeraGen.SortGenMapper.</B><B><A HREF="../../../../../org/apache/hadoop/examples/terasort/TeraGen.SortGenMapper.html#map(org.apache.hadoop.io.LongWritable, org.apache.hadoop.io.NullWritable, org.apache.hadoop.mapred.OutputCollector, org.apache.hadoop.mapred.Reporter)">map</A></B>(<A HREF="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</A>&nbsp;row,
208    <A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A>&nbsp;ignored,
209    <A HREF="../../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</A>&lt;<A HREF="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt;&nbsp;output,
210    <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
211
212<BR>
213&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
214</TR>
215</TABLE>
216&nbsp;
217<P>
218<A NAME="org.apache.hadoop.io"><!-- --></A>
219<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
220<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
221<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
222Uses of <A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A> in <A HREF="../../../../../org/apache/hadoop/io/package-summary.html">org.apache.hadoop.io</A></FONT></TH>
223</TR>
224</TABLE>
225&nbsp;
226<P>
227
228<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
229<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
230<TH ALIGN="left" COLSPAN="2">Methods in <A HREF="../../../../../org/apache/hadoop/io/package-summary.html">org.apache.hadoop.io</A> that return <A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A></FONT></TH>
231</TR>
232<TR BGCOLOR="white" CLASS="TableRowColor">
233<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
234<CODE>static&nbsp;<A HREF="../../../../../org/apache/hadoop/io/NullWritable.html" title="class in org.apache.hadoop.io">NullWritable</A></CODE></FONT></TD>
235<TD><CODE><B>NullWritable.</B><B><A HREF="../../../../../org/apache/hadoop/io/NullWritable.html#get()">get</A></B>()</CODE>
236
237<BR>
238&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the single instance of this class.</TD>
239</TR>
240</TABLE>
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242<P>
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