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7DBInputFormat.DBInputSplit (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapred.lib.db</FONT>
92<BR>
93Class DBInputFormat.DBInputSplit</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.lib.db.DBInputFormat.DBInputSplit</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>, <A HREF="../../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></DD>
100</DL>
101<DL>
102<DT><B>Enclosing class:</B><DD><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.html" title="class in org.apache.hadoop.mapred.lib.db">DBInputFormat</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.html" title="type parameter in DBInputFormat">T</A> extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapred.lib.db">DBWritable</A>&gt;</DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>protected static class <B>DBInputFormat.DBInputSplit</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/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></DL>
107</PRE>
108
109<P>
110A InputSplit that spans a set of rows
111<P>
112
113<P>
114<HR>
115
116<P>
117
118<!-- ======== CONSTRUCTOR SUMMARY ======== -->
119
120<A NAME="constructor_summary"><!-- --></A>
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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/lib/db/DBInputFormat.DBInputSplit.html#DBInputFormat.DBInputSplit()">DBInputFormat.DBInputSplit</A></B>()</CODE>
128
129<BR>
130&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Default Constructor</TD>
131</TR>
132<TR BGCOLOR="white" CLASS="TableRowColor">
133<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.DBInputSplit.html#DBInputFormat.DBInputSplit(long, long)">DBInputFormat.DBInputSplit</A></B>(long&nbsp;start,
134                           long&nbsp;end)</CODE>
135
136<BR>
137&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Convenience Constructor</TD>
138</TR>
139</TABLE>
140&nbsp;
141<!-- ========== METHOD SUMMARY =========== -->
142
143<A NAME="method_summary"><!-- --></A>
144<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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146<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
147<B>Method Summary</B></FONT></TH>
148</TR>
149<TR BGCOLOR="white" CLASS="TableRowColor">
150<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
151<CODE>&nbsp;long</CODE></FONT></TD>
152<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.DBInputSplit.html#getEnd()">getEnd</A></B>()</CODE>
153
154<BR>
155&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
156</TR>
157<TR BGCOLOR="white" CLASS="TableRowColor">
158<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
159<CODE>&nbsp;long</CODE></FONT></TD>
160<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.DBInputSplit.html#getLength()">getLength</A></B>()</CODE>
161
162<BR>
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the total number of bytes in the data of the <code>InputSplit</code>.</TD>
164</TR>
165<TR BGCOLOR="white" CLASS="TableRowColor">
166<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
167<CODE>&nbsp;<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>[]</CODE></FONT></TD>
168<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.DBInputSplit.html#getLocations()">getLocations</A></B>()</CODE>
169
170<BR>
171&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the list of hostnames where the input split is located.</TD>
172</TR>
173<TR BGCOLOR="white" CLASS="TableRowColor">
174<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
175<CODE>&nbsp;long</CODE></FONT></TD>
176<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.DBInputSplit.html#getStart()">getStart</A></B>()</CODE>
177
178<BR>
179&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
180</TR>
181<TR BGCOLOR="white" CLASS="TableRowColor">
182<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
183<CODE>&nbsp;void</CODE></FONT></TD>
184<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.DBInputSplit.html#readFields(java.io.DataInput)">readFields</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A>&nbsp;input)</CODE>
185
186<BR>
187&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deserialize the fields of this object from <code>in</code>.</TD>
188</TR>
189<TR BGCOLOR="white" CLASS="TableRowColor">
190<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
191<CODE>&nbsp;void</CODE></FONT></TD>
192<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.DBInputSplit.html#write(java.io.DataOutput)">write</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</A>&nbsp;output)</CODE>
193
194<BR>
195&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Serialize the fields of this object to <code>out</code>.</TD>
196</TR>
197</TABLE>
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199<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
200<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
201<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>
202</TR>
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205</TR>
206</TABLE>
207&nbsp;
208<P>
209
210<!-- ========= CONSTRUCTOR DETAIL ======== -->
211
212<A NAME="constructor_detail"><!-- --></A>
213<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
214<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
215<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
216<B>Constructor Detail</B></FONT></TH>
217</TR>
218</TABLE>
219
220<A NAME="DBInputFormat.DBInputSplit()"><!-- --></A><H3>
221DBInputFormat.DBInputSplit</H3>
222<PRE>
223public <B>DBInputFormat.DBInputSplit</B>()</PRE>
224<DL>
225<DD>Default Constructor
226<P>
227</DL>
228<HR>
229
230<A NAME="DBInputFormat.DBInputSplit(long, long)"><!-- --></A><H3>
231DBInputFormat.DBInputSplit</H3>
232<PRE>
233public <B>DBInputFormat.DBInputSplit</B>(long&nbsp;start,
234                                  long&nbsp;end)</PRE>
235<DL>
236<DD>Convenience Constructor
237<P>
238<DL>
239<DT><B>Parameters:</B><DD><CODE>start</CODE> - the index of the first row to select<DD><CODE>end</CODE> - the index of the last row to select</DL>
240</DL>
241
242<!-- ============ METHOD DETAIL ========== -->
243
244<A NAME="method_detail"><!-- --></A>
245<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
246<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
247<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
248<B>Method Detail</B></FONT></TH>
249</TR>
250</TABLE>
251
252<A NAME="getLocations()"><!-- --></A><H3>
253getLocations</H3>
254<PRE>
255public <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>[] <B>getLocations</B>()
256                      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>
257<DL>
258<DD>Get the list of hostnames where the input split is located.
259<P>
260<DD><DL>
261<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/InputSplit.html#getLocations()">getLocations</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></CODE></DL>
262</DD>
263<DD><DL>
264
265<DT><B>Returns:</B><DD>list of hostnames where data of the <code>InputSplit</code> is
266         located as an array of <code>String</code>s.
267<DT><B>Throws:</B>
268<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>
269</DD>
270</DL>
271<HR>
272
273<A NAME="getStart()"><!-- --></A><H3>
274getStart</H3>
275<PRE>
276public long <B>getStart</B>()</PRE>
277<DL>
278<DD><DL>
279</DL>
280</DD>
281<DD><DL>
282
283<DT><B>Returns:</B><DD>The index of the first row to select</DL>
284</DD>
285</DL>
286<HR>
287
288<A NAME="getEnd()"><!-- --></A><H3>
289getEnd</H3>
290<PRE>
291public long <B>getEnd</B>()</PRE>
292<DL>
293<DD><DL>
294</DL>
295</DD>
296<DD><DL>
297
298<DT><B>Returns:</B><DD>The index of the last row to select</DL>
299</DD>
300</DL>
301<HR>
302
303<A NAME="getLength()"><!-- --></A><H3>
304getLength</H3>
305<PRE>
306public long <B>getLength</B>()
307               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>
308<DL>
309<DD><B>Description copied from interface: <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/InputSplit.html#getLength()">InputSplit</A></CODE></B></DD>
310<DD>Get the total number of bytes in the data of the <code>InputSplit</code>.
311<P>
312<DD><DL>
313<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/InputSplit.html#getLength()">getLength</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></CODE></DL>
314</DD>
315<DD><DL>
316
317<DT><B>Returns:</B><DD>The total row count in this split
318<DT><B>Throws:</B>
319<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>
320</DD>
321</DL>
322<HR>
323
324<A NAME="readFields(java.io.DataInput)"><!-- --></A><H3>
325readFields</H3>
326<PRE>
327public void <B>readFields</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A>&nbsp;input)
328                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>
329<DL>
330<DD>Deserialize the fields of this object from <code>in</code>. 
331 
332 <p>For efficiency, implementations should attempt to re-use storage in the
333 existing object where possible.</p>
334<P>
335<DD><DL>
336<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">readFields</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></DL>
337</DD>
338<DD><DL>
339<DT><B>Parameters:</B><DD><CODE>input</CODE> - <code>DataInput</code> to deseriablize this object from.
340<DT><B>Throws:</B>
341<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>
342</DD>
343</DL>
344<HR>
345
346<A NAME="write(java.io.DataOutput)"><!-- --></A><H3>
347write</H3>
348<PRE>
349public void <B>write</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</A>&nbsp;output)
350           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>
351<DL>
352<DD>Serialize the fields of this object to <code>out</code>.
353<P>
354<DD><DL>
355<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">write</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></DL>
356</DD>
357<DD><DL>
358<DT><B>Parameters:</B><DD><CODE>output</CODE> - <code>DataOuput</code> to serialize this object into.
359<DT><B>Throws:</B>
360<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>
361</DD>
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