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7RecordReader (Hadoop 0.20.1 API)
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89<H2>
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91org.apache.hadoop.mapred</FONT>
92<BR>
93Interface RecordReader&lt;K,V&gt;</H2>
94<DL>
95<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="interface in org.apache.hadoop.mapred.join">ComposableRecordReader</A>&lt;K,V&gt;</DD>
96</DL>
97<DL>
98<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/lib/CombineFileRecordReader.html" title="class in org.apache.hadoop.mapred.lib">CombineFileRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.DBRecordReader.html" title="class in org.apache.hadoop.mapred.lib.db">DBInputFormat.DBRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/InnerJoinRecordReader.html" title="class in org.apache.hadoop.mapred.join">InnerJoinRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/JoinRecordReader.html" title="class in org.apache.hadoop.mapred.join">JoinRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html" title="class in org.apache.hadoop.mapred">KeyValueLineRecordReader</A>, <A HREF="../../../../org/apache/hadoop/contrib/index/example/LineDocRecordReader.html" title="class in org.apache.hadoop.contrib.index.example">LineDocRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/LineRecordReader.html" title="class in org.apache.hadoop.mapred">LineRecordReader</A>, <A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.MultiFileLineRecordReader.html" title="class in org.apache.hadoop.examples">MultiFileWordCount.MultiFileLineRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/OuterJoinRecordReader.html" title="class in org.apache.hadoop.mapred.join">OuterJoinRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="class in org.apache.hadoop.mapred.join">OverrideRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsTextRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileAsTextRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileRecordReader</A>, <A HREF="../../../../org/apache/hadoop/streaming/StreamBaseRecordReader.html" title="class in org.apache.hadoop.streaming">StreamBaseRecordReader</A>, <A HREF="../../../../org/apache/hadoop/streaming/StreamXmlRecordReader.html" title="class in org.apache.hadoop.streaming">StreamXmlRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/WrappedRecordReader.html" title="class in org.apache.hadoop.mapred.join">WrappedRecordReader</A></DD>
99</DL>
100<HR>
101<DL>
102<DT><PRE>public interface <B>RecordReader&lt;K,V&gt;</B></DL>
103</PRE>
104
105<P>
106<code>RecordReader</code> reads &lt;key, value&gt; pairs from an
107 <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>.
108   
109 <p><code>RecordReader</code>, typically, converts the byte-oriented view of
110 the input, provided by the <code>InputSplit</code>, and presents a
111 record-oriented view for the <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A> & <A HREF="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><CODE>Reducer</CODE></A> tasks for
112 processing. It thus assumes the responsibility of processing record
113 boundaries and presenting the tasks with keys and values.</p>
114<P>
115
116<P>
117<DL>
118<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>,
119<A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A></DL>
120<HR>
121
122<P>
123
124<!-- ========== METHOD SUMMARY =========== -->
125
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129<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
130<B>Method Summary</B></FONT></TH>
131</TR>
132<TR BGCOLOR="white" CLASS="TableRowColor">
133<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
134<CODE>&nbsp;void</CODE></FONT></TD>
135<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#close()">close</A></B>()</CODE>
136
137<BR>
138&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Close this <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A> to future operations.</TD>
139</TR>
140<TR BGCOLOR="white" CLASS="TableRowColor">
141<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
142<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">K</A></CODE></FONT></TD>
143<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#createKey()">createKey</A></B>()</CODE>
144
145<BR>
146&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create an object of the appropriate type to be used as a key.</TD>
147</TR>
148<TR BGCOLOR="white" CLASS="TableRowColor">
149<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
150<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">V</A></CODE></FONT></TD>
151<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#createValue()">createValue</A></B>()</CODE>
152
153<BR>
154&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create an object of the appropriate type to be used as a value.</TD>
155</TR>
156<TR BGCOLOR="white" CLASS="TableRowColor">
157<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
158<CODE>&nbsp;long</CODE></FONT></TD>
159<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#getPos()">getPos</A></B>()</CODE>
160
161<BR>
162&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the current position in the input.</TD>
163</TR>
164<TR BGCOLOR="white" CLASS="TableRowColor">
165<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
166<CODE>&nbsp;float</CODE></FONT></TD>
167<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#getProgress()">getProgress</A></B>()</CODE>
168
169<BR>
170&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;How much of the input has the <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> consumed i.e.</TD>
171</TR>
172<TR BGCOLOR="white" CLASS="TableRowColor">
173<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
174<CODE>&nbsp;boolean</CODE></FONT></TD>
175<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#next(K, V)">next</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">K</A>&nbsp;key,
176     <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">V</A>&nbsp;value)</CODE>
177
178<BR>
179&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads the next key/value pair from the input for processing.</TD>
180</TR>
181</TABLE>
182&nbsp;
183<P>
184
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191<B>Method Detail</B></FONT></TH>
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193</TABLE>
194
195<A NAME="next(java.lang.Object,java.lang.Object)"><!-- --></A><A NAME="next(K, V)"><!-- --></A><H3>
196next</H3>
197<PRE>
198boolean <B>next</B>(<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">K</A>&nbsp;key,
199             <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">V</A>&nbsp;value)
200             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>
201<DL>
202<DD>Reads the next key/value pair from the input for processing.
203<P>
204<DD><DL>
205<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key to read data into<DD><CODE>value</CODE> - the value to read data into
206<DT><B>Returns:</B><DD>true iff a key/value was read, false if at EOF
207<DT><B>Throws:</B>
208<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>
209</DD>
210</DL>
211<HR>
212
213<A NAME="createKey()"><!-- --></A><H3>
214createKey</H3>
215<PRE>
216<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">K</A> <B>createKey</B>()</PRE>
217<DL>
218<DD>Create an object of the appropriate type to be used as a key.
219<P>
220<DD><DL>
221
222<DT><B>Returns:</B><DD>a new key object.</DL>
223</DD>
224</DL>
225<HR>
226
227<A NAME="createValue()"><!-- --></A><H3>
228createValue</H3>
229<PRE>
230<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">V</A> <B>createValue</B>()</PRE>
231<DL>
232<DD>Create an object of the appropriate type to be used as a value.
233<P>
234<DD><DL>
235
236<DT><B>Returns:</B><DD>a new value object.</DL>
237</DD>
238</DL>
239<HR>
240
241<A NAME="getPos()"><!-- --></A><H3>
242getPos</H3>
243<PRE>
244long <B>getPos</B>()
245            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>
246<DL>
247<DD>Returns the current position in the input.
248<P>
249<DD><DL>
250
251<DT><B>Returns:</B><DD>the current position in the input.
252<DT><B>Throws:</B>
253<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>
254</DD>
255</DL>
256<HR>
257
258<A NAME="close()"><!-- --></A><H3>
259close</H3>
260<PRE>
261void <B>close</B>()
262           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>
263<DL>
264<DD>Close this <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A> to future operations.
265<P>
266<DD><DL>
267
268<DT><B>Throws:</B>
269<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>
270</DD>
271</DL>
272<HR>
273
274<A NAME="getProgress()"><!-- --></A><H3>
275getProgress</H3>
276<PRE>
277float <B>getProgress</B>()
278                  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>
279<DL>
280<DD>How much of the input has the <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> consumed i.e.
281 has been processed by?
282<P>
283<DD><DL>
284
285<DT><B>Returns:</B><DD>progress from <code>0.0</code> to <code>1.0</code>.
286<DT><B>Throws:</B>
287<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>
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