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

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7MultiFileWordCount (Hadoop 0.20.1 API)
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91org.apache.hadoop.examples</FONT>
92<BR>
93Class MultiFileWordCount</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 "><A HREF="../../../../org/apache/hadoop/conf/Configured.html" title="class in org.apache.hadoop.conf">org.apache.hadoop.conf.Configured</A>
97      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.examples.MultiFileWordCount</B>
98</PRE>
99<DL>
100<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A>, <A HREF="../../../../org/apache/hadoop/util/Tool.html" title="interface in org.apache.hadoop.util">Tool</A></DD>
101</DL>
102<HR>
103<DL>
104<DT><PRE>public class <B>MultiFileWordCount</B><DT>extends <A HREF="../../../../org/apache/hadoop/conf/Configured.html" title="class in org.apache.hadoop.conf">Configured</A><DT>implements <A HREF="../../../../org/apache/hadoop/util/Tool.html" title="interface in org.apache.hadoop.util">Tool</A></DL>
105</PRE>
106
107<P>
108MultiFileWordCount is an example to demonstrate the usage of
109 MultiFileInputFormat. This examples counts the occurrences of
110 words in the text files under the given input directory.
111<P>
112
113<P>
114<HR>
115
116<P>
117<!-- ======== NESTED CLASS SUMMARY ======== -->
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123<B>Nested Class Summary</B></FONT></TH>
124</TR>
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126<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
127<CODE>static&nbsp;class</CODE></FONT></TD>
128<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.MapClass.html" title="class in org.apache.hadoop.examples">MultiFileWordCount.MapClass</A></B></CODE>
129
130<BR>
131&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This Mapper is similar to the one in <A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.MapClass.html" title="class in org.apache.hadoop.examples"><CODE>MultiFileWordCount.MapClass</CODE></A>.</TD>
132</TR>
133<TR BGCOLOR="white" CLASS="TableRowColor">
134<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
135<CODE>static&nbsp;class</CODE></FONT></TD>
136<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.MultiFileLineRecordReader.html" title="class in org.apache.hadoop.examples">MultiFileWordCount.MultiFileLineRecordReader</A></B></CODE>
137
138<BR>
139&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RecordReader is responsible from extracting records from the InputSplit.</TD>
140</TR>
141<TR BGCOLOR="white" CLASS="TableRowColor">
142<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
143<CODE>static&nbsp;class</CODE></FONT></TD>
144<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.MyInputFormat.html" title="class in org.apache.hadoop.examples">MultiFileWordCount.MyInputFormat</A></B></CODE>
145
146<BR>
147&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To use <A HREF="../../../../org/apache/hadoop/mapred/MultiFileInputFormat.html" title="class in org.apache.hadoop.mapred"><CODE>MultiFileInputFormat</CODE></A>, one should extend it, to return a
148 (custom) <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A>.</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
152<CODE>static&nbsp;class</CODE></FONT></TD>
153<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.WordOffset.html" title="class in org.apache.hadoop.examples">MultiFileWordCount.WordOffset</A></B></CODE>
154
155<BR>
156&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This record keeps &lt;filename,offset&gt; pairs.</TD>
157</TR>
158</TABLE>
159&nbsp;
160<!-- ======== CONSTRUCTOR SUMMARY ======== -->
161
162<A NAME="constructor_summary"><!-- --></A>
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165<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
166<B>Constructor Summary</B></FONT></TH>
167</TR>
168<TR BGCOLOR="white" CLASS="TableRowColor">
169<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.html#MultiFileWordCount()">MultiFileWordCount</A></B>()</CODE>
170
171<BR>
172&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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174</TABLE>
175&nbsp;
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186<CODE>static&nbsp;void</CODE></FONT></TD>
187<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.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;args)</CODE>
188
189<BR>
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191</TR>
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194<CODE>&nbsp;int</CODE></FONT></TD>
195<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.html#run(java.lang.String[])">run</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;args)</CODE>
196
197<BR>
198&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Execute the command with the given arguments.</TD>
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223</TR>
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226</TR>
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228&nbsp;
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237<B>Constructor Detail</B></FONT></TH>
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239</TABLE>
240
241<A NAME="MultiFileWordCount()"><!-- --></A><H3>
242MultiFileWordCount</H3>
243<PRE>
244public <B>MultiFileWordCount</B>()</PRE>
245<DL>
246</DL>
247
248<!-- ============ METHOD DETAIL ========== -->
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258<A NAME="run(java.lang.String[])"><!-- --></A><H3>
259run</H3>
260<PRE>
261public int <B>run</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;args)
262        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>
263<DL>
264<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/util/Tool.html#run(java.lang.String[])">Tool</A></CODE></B></DD>
265<DD>Execute the command with the given arguments.
266<P>
267<DD><DL>
268<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/util/Tool.html#run(java.lang.String[])">run</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/util/Tool.html" title="interface in org.apache.hadoop.util">Tool</A></CODE></DL>
269</DD>
270<DD><DL>
271<DT><B>Parameters:</B><DD><CODE>args</CODE> - command specific arguments.
272<DT><B>Returns:</B><DD>exit code.
273<DT><B>Throws:</B>
274<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>
275</DD>
276</DL>
277<HR>
278
279<A NAME="main(java.lang.String[])"><!-- --></A><H3>
280main</H3>
281<PRE>
282public 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;args)
283                 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>
284<DL>
285<DD><DL>
286</DL>
287</DD>
288<DD><DL>
289
290<DT><B>Throws:</B>
291<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>
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