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7SequenceFile.Sorter.SegmentDescriptor (Hadoop 0.20.1 API)
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91org.apache.hadoop.io</FONT>
92<BR>
93Class SequenceFile.Sorter.SegmentDescriptor</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.io.SequenceFile.Sorter.SegmentDescriptor</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A></DD>
100</DL>
101<DL>
102<DT><B>Enclosing class:</B><DD><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.html" title="class in org.apache.hadoop.io">SequenceFile.Sorter</A></DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>public class <B>SequenceFile.Sorter.SegmentDescriptor</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/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A></DL>
107</PRE>
108
109<P>
110This class defines a merge segment. This class can be subclassed to
111 provide a customized cleanup method implementation. In this
112 implementation, cleanup closes the file handle and deletes the file
113<P>
114
115<P>
116<HR>
117
118<P>
119
120<!-- ======== CONSTRUCTOR SUMMARY ======== -->
121
122<A NAME="constructor_summary"><!-- --></A>
123<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
124<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
125<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
126<B>Constructor Summary</B></FONT></TH>
127</TR>
128<TR BGCOLOR="white" CLASS="TableRowColor">
129<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#SequenceFile.Sorter.SegmentDescriptor(long, long, org.apache.hadoop.fs.Path)">SequenceFile.Sorter.SegmentDescriptor</A></B>(long&nbsp;segmentOffset,
130                                      long&nbsp;segmentLength,
131                                      <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;segmentPathName)</CODE>
132
133<BR>
134&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs a segment</TD>
135</TR>
136</TABLE>
137&nbsp;
138<!-- ========== METHOD SUMMARY =========== -->
139
140<A NAME="method_summary"><!-- --></A>
141<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
142<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
143<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
144<B>Method Summary</B></FONT></TH>
145</TR>
146<TR BGCOLOR="white" CLASS="TableRowColor">
147<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
148<CODE>&nbsp;void</CODE></FONT></TD>
149<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#cleanup()">cleanup</A></B>()</CODE>
150
151<BR>
152&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The default cleanup.</TD>
153</TR>
154<TR BGCOLOR="white" CLASS="TableRowColor">
155<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
156<CODE>&nbsp;int</CODE></FONT></TD>
157<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#compareTo(java.lang.Object)">compareTo</A></B>(<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>&nbsp;o)</CODE>
158
159<BR>
160&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
161</TR>
162<TR BGCOLOR="white" CLASS="TableRowColor">
163<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
164<CODE>&nbsp;void</CODE></FONT></TD>
165<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#doSync()">doSync</A></B>()</CODE>
166
167<BR>
168&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Do the sync checks</TD>
169</TR>
170<TR BGCOLOR="white" CLASS="TableRowColor">
171<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
172<CODE>&nbsp;boolean</CODE></FONT></TD>
173<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#equals(java.lang.Object)">equals</A></B>(<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>&nbsp;o)</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="../../../../org/apache/hadoop/io/DataOutputBuffer.html" title="class in org.apache.hadoop.io">DataOutputBuffer</A></CODE></FONT></TD>
181<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#getKey()">getKey</A></B>()</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the stored rawKey</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>&nbsp;int</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#hashCode()">hashCode</A></B>()</CODE>
190
191<BR>
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
193</TR>
194<TR BGCOLOR="white" CLASS="TableRowColor">
195<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
196<CODE>&nbsp;boolean</CODE></FONT></TD>
197<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#nextRawKey()">nextRawKey</A></B>()</CODE>
198
199<BR>
200&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fills up the rawKey object with the key returned by the Reader</TD>
201</TR>
202<TR BGCOLOR="white" CLASS="TableRowColor">
203<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
204<CODE>&nbsp;int</CODE></FONT></TD>
205<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#nextRawValue(org.apache.hadoop.io.SequenceFile.ValueBytes)">nextRawValue</A></B>(<A HREF="../../../../org/apache/hadoop/io/SequenceFile.ValueBytes.html" title="interface in org.apache.hadoop.io">SequenceFile.ValueBytes</A>&nbsp;rawValue)</CODE>
206
207<BR>
208&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fills up the passed rawValue with the value corresponding to the key
209 read earlier</TD>
210</TR>
211<TR BGCOLOR="white" CLASS="TableRowColor">
212<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
213<CODE>&nbsp;void</CODE></FONT></TD>
214<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#preserveInput(boolean)">preserveInput</A></B>(boolean&nbsp;preserve)</CODE>
215
216<BR>
217&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Whether to delete the files when no longer needed</TD>
218</TR>
219<TR BGCOLOR="white" CLASS="TableRowColor">
220<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
221<CODE>&nbsp;boolean</CODE></FONT></TD>
222<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.SegmentDescriptor.html#shouldPreserveInput()">shouldPreserveInput</A></B>()</CODE>
223
224<BR>
225&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
226</TR>
227</TABLE>
228&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
229<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
230<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
231<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>
232</TR>
233<TR BGCOLOR="white" CLASS="TableRowColor">
234<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#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#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>
235</TR>
236</TABLE>
237&nbsp;
238<P>
239
240<!-- ========= CONSTRUCTOR DETAIL ======== -->
241
242<A NAME="constructor_detail"><!-- --></A>
243<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
244<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
245<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
246<B>Constructor Detail</B></FONT></TH>
247</TR>
248</TABLE>
249
250<A NAME="SequenceFile.Sorter.SegmentDescriptor(long, long, org.apache.hadoop.fs.Path)"><!-- --></A><H3>
251SequenceFile.Sorter.SegmentDescriptor</H3>
252<PRE>
253public <B>SequenceFile.Sorter.SegmentDescriptor</B>(long&nbsp;segmentOffset,
254                                             long&nbsp;segmentLength,
255                                             <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;segmentPathName)</PRE>
256<DL>
257<DD>Constructs a segment
258<P>
259<DL>
260<DT><B>Parameters:</B><DD><CODE>segmentOffset</CODE> - the offset of the segment in the file<DD><CODE>segmentLength</CODE> - the length of the segment<DD><CODE>segmentPathName</CODE> - the path name of the file containing the segment</DL>
261</DL>
262
263<!-- ============ METHOD DETAIL ========== -->
264
265<A NAME="method_detail"><!-- --></A>
266<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
267<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
268<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
269<B>Method Detail</B></FONT></TH>
270</TR>
271</TABLE>
272
273<A NAME="doSync()"><!-- --></A><H3>
274doSync</H3>
275<PRE>
276public void <B>doSync</B>()</PRE>
277<DL>
278<DD>Do the sync checks
279<P>
280<DD><DL>
281</DL>
282</DD>
283<DD><DL>
284</DL>
285</DD>
286</DL>
287<HR>
288
289<A NAME="preserveInput(boolean)"><!-- --></A><H3>
290preserveInput</H3>
291<PRE>
292public void <B>preserveInput</B>(boolean&nbsp;preserve)</PRE>
293<DL>
294<DD>Whether to delete the files when no longer needed
295<P>
296<DD><DL>
297</DL>
298</DD>
299<DD><DL>
300</DL>
301</DD>
302</DL>
303<HR>
304
305<A NAME="shouldPreserveInput()"><!-- --></A><H3>
306shouldPreserveInput</H3>
307<PRE>
308public boolean <B>shouldPreserveInput</B>()</PRE>
309<DL>
310<DD><DL>
311</DL>
312</DD>
313<DD><DL>
314</DL>
315</DD>
316</DL>
317<HR>
318
319<A NAME="compareTo(java.lang.Object)"><!-- --></A><H3>
320compareTo</H3>
321<PRE>
322public int <B>compareTo</B>(<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>&nbsp;o)</PRE>
323<DL>
324<DD><DL>
325<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true#compareTo(T)" title="class or interface in java.lang">compareTo</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A></CODE></DL>
326</DD>
327<DD><DL>
328</DL>
329</DD>
330</DL>
331<HR>
332
333<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
334equals</H3>
335<PRE>
336public boolean <B>equals</B>(<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>&nbsp;o)</PRE>
337<DL>
338<DD><DL>
339<DT><B>Overrides:</B><DD><CODE><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></CODE> in class <CODE><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></CODE></DL>
340</DD>
341<DD><DL>
342</DL>
343</DD>
344</DL>
345<HR>
346
347<A NAME="hashCode()"><!-- --></A><H3>
348hashCode</H3>
349<PRE>
350public int <B>hashCode</B>()</PRE>
351<DL>
352<DD><DL>
353<DT><B>Overrides:</B><DD><CODE><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></CODE> in class <CODE><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></CODE></DL>
354</DD>
355<DD><DL>
356</DL>
357</DD>
358</DL>
359<HR>
360
361<A NAME="nextRawKey()"><!-- --></A><H3>
362nextRawKey</H3>
363<PRE>
364public boolean <B>nextRawKey</B>()
365                   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>
366<DL>
367<DD>Fills up the rawKey object with the key returned by the Reader
368<P>
369<DD><DL>
370</DL>
371</DD>
372<DD><DL>
373
374<DT><B>Returns:</B><DD>true if there is a key returned; false, otherwise
375<DT><B>Throws:</B>
376<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>
377</DD>
378</DL>
379<HR>
380
381<A NAME="nextRawValue(org.apache.hadoop.io.SequenceFile.ValueBytes)"><!-- --></A><H3>
382nextRawValue</H3>
383<PRE>
384public int <B>nextRawValue</B>(<A HREF="../../../../org/apache/hadoop/io/SequenceFile.ValueBytes.html" title="interface in org.apache.hadoop.io">SequenceFile.ValueBytes</A>&nbsp;rawValue)
385                 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>
386<DL>
387<DD>Fills up the passed rawValue with the value corresponding to the key
388 read earlier
389<P>
390<DD><DL>
391</DL>
392</DD>
393<DD><DL>
394<DT><B>Parameters:</B><DD><CODE>rawValue</CODE> -
395<DT><B>Returns:</B><DD>the length of the value
396<DT><B>Throws:</B>
397<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>
398</DD>
399</DL>
400<HR>
401
402<A NAME="getKey()"><!-- --></A><H3>
403getKey</H3>
404<PRE>
405public <A HREF="../../../../org/apache/hadoop/io/DataOutputBuffer.html" title="class in org.apache.hadoop.io">DataOutputBuffer</A> <B>getKey</B>()</PRE>
406<DL>
407<DD>Returns the stored rawKey
408<P>
409<DD><DL>
410</DL>
411</DD>
412<DD><DL>
413</DL>
414</DD>
415</DL>
416<HR>
417
418<A NAME="cleanup()"><!-- --></A><H3>
419cleanup</H3>
420<PRE>
421public void <B>cleanup</B>()
422             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>
423<DL>
424<DD>The default cleanup. Subclasses can override this with a custom
425 cleanup
426<P>
427<DD><DL>
428</DL>
429</DD>
430<DD><DL>
431
432<DT><B>Throws:</B>
433<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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