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7RecordReader (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapreduce</FONT>
92<BR>
93Class RecordReader&lt;KEYIN,VALUEIN&gt;</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.RecordReader&lt;KEYIN,VALUEIN&gt;</B>
97</PRE>
98<DL>
99<DT><DT><B>Type Parameters:</B><DD><CODE>KEYIN</CODE> - <DD><CODE>VALUEIN</CODE> - </DL>
100<DL>
101<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A></DD>
102</DL>
103<DL>
104<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/LineRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.input">LineRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/SequenceFileRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.input">SequenceFileRecordReader</A></DD>
105</DL>
106<HR>
107<DL>
108<DT><PRE>public abstract class <B>RecordReader&lt;KEYIN,VALUEIN&gt;</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="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A></DL>
109</PRE>
110
111<P>
112The record reader breaks the data into key/value pairs for input to the
113 <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A>.
114<P>
115
116<P>
117<HR>
118
119<P>
120
121<!-- ======== CONSTRUCTOR SUMMARY ======== -->
122
123<A NAME="constructor_summary"><!-- --></A>
124<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
125<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
126<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
127<B>Constructor Summary</B></FONT></TH>
128</TR>
129<TR BGCOLOR="white" CLASS="TableRowColor">
130<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html#RecordReader()">RecordReader</A></B>()</CODE>
131
132<BR>
133&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
134</TR>
135</TABLE>
136&nbsp;
137<!-- ========== METHOD SUMMARY =========== -->
138
139<A NAME="method_summary"><!-- --></A>
140<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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142<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
143<B>Method Summary</B></FONT></TH>
144</TR>
145<TR BGCOLOR="white" CLASS="TableRowColor">
146<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
147<CODE>abstract &nbsp;void</CODE></FONT></TD>
148<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html#close()">close</A></B>()</CODE>
149
150<BR>
151&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Close the record reader.</TD>
152</TR>
153<TR BGCOLOR="white" CLASS="TableRowColor">
154<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
155<CODE>abstract &nbsp;<A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="type parameter in RecordReader">KEYIN</A></CODE></FONT></TD>
156<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html#getCurrentKey()">getCurrentKey</A></B>()</CODE>
157
158<BR>
159&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the current key</TD>
160</TR>
161<TR BGCOLOR="white" CLASS="TableRowColor">
162<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
163<CODE>abstract &nbsp;<A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="type parameter in RecordReader">VALUEIN</A></CODE></FONT></TD>
164<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html#getCurrentValue()">getCurrentValue</A></B>()</CODE>
165
166<BR>
167&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the current value.</TD>
168</TR>
169<TR BGCOLOR="white" CLASS="TableRowColor">
170<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
171<CODE>abstract &nbsp;float</CODE></FONT></TD>
172<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html#getProgress()">getProgress</A></B>()</CODE>
173
174<BR>
175&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The current progress of the record reader through its data.</TD>
176</TR>
177<TR BGCOLOR="white" CLASS="TableRowColor">
178<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
179<CODE>abstract &nbsp;void</CODE></FONT></TD>
180<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html#initialize(org.apache.hadoop.mapreduce.InputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext)">initialize</A></B>(<A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce">InputSplit</A>&nbsp;split,
181           <A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;context)</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Called once at initialization.</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>abstract &nbsp;boolean</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html#nextKeyValue()">nextKeyValue</A></B>()</CODE>
190
191<BR>
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read the next key, value pair.</TD>
193</TR>
194</TABLE>
195&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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198<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>
199</TR>
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201<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#equals(java.lang.Object)" title="class or interface in java.lang">equals</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#hashCode()" title="class or interface in java.lang">hashCode</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>
202</TR>
203</TABLE>
204&nbsp;
205<P>
206
207<!-- ========= CONSTRUCTOR DETAIL ======== -->
208
209<A NAME="constructor_detail"><!-- --></A>
210<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
211<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
212<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
213<B>Constructor Detail</B></FONT></TH>
214</TR>
215</TABLE>
216
217<A NAME="RecordReader()"><!-- --></A><H3>
218RecordReader</H3>
219<PRE>
220public <B>RecordReader</B>()</PRE>
221<DL>
222</DL>
223
224<!-- ============ METHOD DETAIL ========== -->
225
226<A NAME="method_detail"><!-- --></A>
227<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
228<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
229<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
230<B>Method Detail</B></FONT></TH>
231</TR>
232</TABLE>
233
234<A NAME="initialize(org.apache.hadoop.mapreduce.InputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext)"><!-- --></A><H3>
235initialize</H3>
236<PRE>
237public abstract void <B>initialize</B>(<A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce">InputSplit</A>&nbsp;split,
238                                <A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;context)
239                         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>,
240                                <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
241<DL>
242<DD>Called once at initialization.
243<P>
244<DD><DL>
245</DL>
246</DD>
247<DD><DL>
248<DT><B>Parameters:</B><DD><CODE>split</CODE> - the split that defines the range of records to read<DD><CODE>context</CODE> - the information about the task
249<DT><B>Throws:</B>
250<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>
251<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL>
252</DD>
253</DL>
254<HR>
255
256<A NAME="nextKeyValue()"><!-- --></A><H3>
257nextKeyValue</H3>
258<PRE>
259public abstract boolean <B>nextKeyValue</B>()
260                              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>,
261                                     <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
262<DL>
263<DD>Read the next key, value pair.
264<P>
265<DD><DL>
266</DL>
267</DD>
268<DD><DL>
269
270<DT><B>Returns:</B><DD>true if a key/value pair was read
271<DT><B>Throws:</B>
272<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>
273<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL>
274</DD>
275</DL>
276<HR>
277
278<A NAME="getCurrentKey()"><!-- --></A><H3>
279getCurrentKey</H3>
280<PRE>
281public abstract <A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="type parameter in RecordReader">KEYIN</A> <B>getCurrentKey</B>()
282                             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>,
283                                    <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
284<DL>
285<DD>Get the current key
286<P>
287<DD><DL>
288</DL>
289</DD>
290<DD><DL>
291
292<DT><B>Returns:</B><DD>the current key or null if there is no current key
293<DT><B>Throws:</B>
294<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>
295<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL>
296</DD>
297</DL>
298<HR>
299
300<A NAME="getCurrentValue()"><!-- --></A><H3>
301getCurrentValue</H3>
302<PRE>
303public abstract <A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="type parameter in RecordReader">VALUEIN</A> <B>getCurrentValue</B>()
304                                 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>,
305                                        <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
306<DL>
307<DD>Get the current value.
308<P>
309<DD><DL>
310</DL>
311</DD>
312<DD><DL>
313
314<DT><B>Returns:</B><DD>the object that was read
315<DT><B>Throws:</B>
316<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>
317<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL>
318</DD>
319</DL>
320<HR>
321
322<A NAME="getProgress()"><!-- --></A><H3>
323getProgress</H3>
324<PRE>
325public abstract float <B>getProgress</B>()
326                           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>,
327                                  <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
328<DL>
329<DD>The current progress of the record reader through its data.
330<P>
331<DD><DL>
332</DL>
333</DD>
334<DD><DL>
335
336<DT><B>Returns:</B><DD>a number between 0.0 and 1.0 that is the fraction of the data read
337<DT><B>Throws:</B>
338<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>
339<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL>
340</DD>
341</DL>
342<HR>
343
344<A NAME="close()"><!-- --></A><H3>
345close</H3>
346<PRE>
347public abstract void <B>close</B>()
348                    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>
349<DL>
350<DD>Close the record reader.
351<P>
352<DD><DL>
353<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true#close()" title="class or interface in java.io">close</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A></CODE></DL>
354</DD>
355<DD><DL>
356
357<DT><B>Throws:</B>
358<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>
359</DD>
360</DL>
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