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7KeyValueLineRecordReader (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapred</FONT>
92<BR>
93Class KeyValueLineRecordReader</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.KeyValueLineRecordReader</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</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;</DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>KeyValueLineRecordReader</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/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</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;</DL>
104</PRE>
105
106<P>
107This class treats a line in the input as a key/value pair separated by a
108 separator character. The separator can be specified in config file
109 under the attribute name key.value.separator.in.input.line. The default
110 separator is the tab character ('\t').
111<P>
112
113<P>
114<HR>
115
116<P>
117
118<!-- ======== CONSTRUCTOR SUMMARY ======== -->
119
120<A NAME="constructor_summary"><!-- --></A>
121<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
122<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
123<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
124<B>Constructor Summary</B></FONT></TH>
125</TR>
126<TR BGCOLOR="white" CLASS="TableRowColor">
127<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html#KeyValueLineRecordReader(org.apache.hadoop.conf.Configuration, org.apache.hadoop.mapred.FileSplit)">KeyValueLineRecordReader</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;job,
128                         <A HREF="../../../../org/apache/hadoop/mapred/FileSplit.html" title="class in org.apache.hadoop.mapred">FileSplit</A>&nbsp;split)</CODE>
129
130<BR>
131&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
132</TR>
133</TABLE>
134&nbsp;
135<!-- ========== METHOD SUMMARY =========== -->
136
137<A NAME="method_summary"><!-- --></A>
138<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
139<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
140<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
141<B>Method Summary</B></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><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html#close()">close</A></B>()</CODE>
147
148<BR>
149&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>
150</TR>
151<TR BGCOLOR="white" CLASS="TableRowColor">
152<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
153<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A></CODE></FONT></TD>
154<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html#createKey()">createKey</A></B>()</CODE>
155
156<BR>
157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create an object of the appropriate type to be used as a key.</TD>
158</TR>
159<TR BGCOLOR="white" CLASS="TableRowColor">
160<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
161<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A></CODE></FONT></TD>
162<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html#createValue()">createValue</A></B>()</CODE>
163
164<BR>
165&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create an object of the appropriate type to be used as a value.</TD>
166</TR>
167<TR BGCOLOR="white" CLASS="TableRowColor">
168<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
169<CODE>static&nbsp;int</CODE></FONT></TD>
170<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html#findSeparator(byte[], int, int, byte)">findSeparator</A></B>(byte[]&nbsp;utf,
171              int&nbsp;start,
172              int&nbsp;length,
173              byte&nbsp;sep)</CODE>
174
175<BR>
176&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
177</TR>
178<TR BGCOLOR="white" CLASS="TableRowColor">
179<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
180<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A></CODE></FONT></TD>
181<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html#getKeyClass()">getKeyClass</A></B>()</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>&nbsp;long</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html#getPos()">getPos</A></B>()</CODE>
190
191<BR>
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the current position in the input.</TD>
193</TR>
194<TR BGCOLOR="white" CLASS="TableRowColor">
195<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
196<CODE>&nbsp;float</CODE></FONT></TD>
197<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html#getProgress()">getProgress</A></B>()</CODE>
198
199<BR>
200&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>
201</TR>
202<TR BGCOLOR="white" CLASS="TableRowColor">
203<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
204<CODE>&nbsp;boolean</CODE></FONT></TD>
205<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html#next(org.apache.hadoop.io.Text, org.apache.hadoop.io.Text)">next</A></B>(<A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;key,
206     <A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;value)</CODE>
207
208<BR>
209&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read key/value pair in a line.</TD>
210</TR>
211</TABLE>
212&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
213<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
214<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
215<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>
216</TR>
217<TR BGCOLOR="white" CLASS="TableRowColor">
218<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>
219</TR>
220</TABLE>
221&nbsp;
222<P>
223
224<!-- ========= CONSTRUCTOR DETAIL ======== -->
225
226<A NAME="constructor_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>Constructor Detail</B></FONT></TH>
231</TR>
232</TABLE>
233
234<A NAME="KeyValueLineRecordReader(org.apache.hadoop.conf.Configuration, org.apache.hadoop.mapred.FileSplit)"><!-- --></A><H3>
235KeyValueLineRecordReader</H3>
236<PRE>
237public <B>KeyValueLineRecordReader</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;job,
238                                <A HREF="../../../../org/apache/hadoop/mapred/FileSplit.html" title="class in org.apache.hadoop.mapred">FileSplit</A>&nbsp;split)
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></PRE>
240<DL>
241<DL>
242
243<DT><B>Throws:</B>
244<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>
245</DL>
246
247<!-- ============ METHOD DETAIL ========== -->
248
249<A NAME="method_detail"><!-- --></A>
250<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
251<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
252<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
253<B>Method Detail</B></FONT></TH>
254</TR>
255</TABLE>
256
257<A NAME="getKeyClass()"><!-- --></A><H3>
258getKeyClass</H3>
259<PRE>
260public <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A> <B>getKeyClass</B>()</PRE>
261<DL>
262<DD><DL>
263</DL>
264</DD>
265<DD><DL>
266</DL>
267</DD>
268</DL>
269<HR>
270
271<A NAME="createKey()"><!-- --></A><H3>
272createKey</H3>
273<PRE>
274public <A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A> <B>createKey</B>()</PRE>
275<DL>
276<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#createKey()">RecordReader</A></CODE></B></DD>
277<DD>Create an object of the appropriate type to be used as a key.
278<P>
279<DD><DL>
280<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#createKey()">createKey</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</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;</CODE></DL>
281</DD>
282<DD><DL>
283
284<DT><B>Returns:</B><DD>a new key object.</DL>
285</DD>
286</DL>
287<HR>
288
289<A NAME="createValue()"><!-- --></A><H3>
290createValue</H3>
291<PRE>
292public <A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A> <B>createValue</B>()</PRE>
293<DL>
294<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#createValue()">RecordReader</A></CODE></B></DD>
295<DD>Create an object of the appropriate type to be used as a value.
296<P>
297<DD><DL>
298<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#createValue()">createValue</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</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;</CODE></DL>
299</DD>
300<DD><DL>
301
302<DT><B>Returns:</B><DD>a new value object.</DL>
303</DD>
304</DL>
305<HR>
306
307<A NAME="findSeparator(byte[], int, int, byte)"><!-- --></A><H3>
308findSeparator</H3>
309<PRE>
310public static int <B>findSeparator</B>(byte[]&nbsp;utf,
311                                int&nbsp;start,
312                                int&nbsp;length,
313                                byte&nbsp;sep)</PRE>
314<DL>
315<DD><DL>
316</DL>
317</DD>
318<DD><DL>
319</DL>
320</DD>
321</DL>
322<HR>
323
324<A NAME="next(org.apache.hadoop.io.Text, org.apache.hadoop.io.Text)"><!-- --></A><H3>
325next</H3>
326<PRE>
327public boolean <B>next</B>(<A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;key,
328                    <A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;value)
329             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>
330<DL>
331<DD>Read key/value pair in a line.
332<P>
333<DD><DL>
334<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#next(K, V)">next</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</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;</CODE></DL>
335</DD>
336<DD><DL>
337<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key to read data into<DD><CODE>value</CODE> - the value to read data into
338<DT><B>Returns:</B><DD>true iff a key/value was read, false if at EOF
339<DT><B>Throws:</B>
340<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>
341</DD>
342</DL>
343<HR>
344
345<A NAME="getProgress()"><!-- --></A><H3>
346getProgress</H3>
347<PRE>
348public float <B>getProgress</B>()</PRE>
349<DL>
350<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#getProgress()">RecordReader</A></CODE></B></DD>
351<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.
352 has been processed by?
353<P>
354<DD><DL>
355<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#getProgress()">getProgress</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</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;</CODE></DL>
356</DD>
357<DD><DL>
358
359<DT><B>Returns:</B><DD>progress from <code>0.0</code> to <code>1.0</code>.</DL>
360</DD>
361</DL>
362<HR>
363
364<A NAME="getPos()"><!-- --></A><H3>
365getPos</H3>
366<PRE>
367public long <B>getPos</B>()
368            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>
369<DL>
370<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#getPos()">RecordReader</A></CODE></B></DD>
371<DD>Returns the current position in the input.
372<P>
373<DD><DL>
374<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#getPos()">getPos</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</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;</CODE></DL>
375</DD>
376<DD><DL>
377
378<DT><B>Returns:</B><DD>the current position in the input.
379<DT><B>Throws:</B>
380<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>
381</DD>
382</DL>
383<HR>
384
385<A NAME="close()"><!-- --></A><H3>
386close</H3>
387<PRE>
388public void <B>close</B>()
389           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>
390<DL>
391<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#close()">RecordReader</A></CODE></B></DD>
392<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.
393<P>
394<DD><DL>
395<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#close()">close</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</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;</CODE></DL>
396</DD>
397<DD><DL>
398
399<DT><B>Throws:</B>
400<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>
401</DD>
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