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91org.apache.hadoop.io</FONT>
92<BR>
93Class SequenceFile</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</B>
97</PRE>
98<HR>
99<DL>
100<DT><PRE>public class <B>SequenceFile</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></DL>
101</PRE>
102
103<P>
104<code>SequenceFile</code>s are flat files consisting of binary key/value
105 pairs.
106 
107 <p><code>SequenceFile</code> provides <A HREF="http://java.sun.com/javase/6/docs/api/java/io/Writer.html?is-external=true" title="class or interface in java.io"><CODE>Writer</CODE></A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/Reader.html?is-external=true" title="class or interface in java.io"><CODE>Reader</CODE></A> and
108 <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile.Sorter</CODE></A> classes for writing, reading and sorting respectively.</p>
109 
110 There are three <code>SequenceFile</code> <code>Writer</code>s based on the
111 <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io"><CODE>SequenceFile.CompressionType</CODE></A> used to compress key/value pairs:
112 <ol>
113   <li>
114   <code>Writer</code> : Uncompressed records.
115   </li>
116   <li>
117   <code>RecordCompressWriter</code> : Record-compressed files, only compress
118                                       values.
119   </li>
120   <li>
121   <code>BlockCompressWriter</code> : Block-compressed files, both keys & 
122                                      values are collected in 'blocks'
123                                      separately and compressed. The size of
124                                      the 'block' is configurable.
125 </ol>
126 
127 <p>The actual compression algorithm used to compress key and/or values can be
128 specified by using the appropriate <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress"><CODE>CompressionCodec</CODE></A>.</p>
129 
130 <p>The recommended way is to use the static <tt>createWriter</tt> methods
131 provided by the <code>SequenceFile</code> to chose the preferred format.</p>
132
133 <p>The <A HREF="http://java.sun.com/javase/6/docs/api/java/io/Reader.html?is-external=true" title="class or interface in java.io"><CODE>Reader</CODE></A> acts as the bridge and can read any of the above
134 <code>SequenceFile</code> formats.</p>
135
136 <h4 id="Formats">SequenceFile Formats</h4>
137 
138 <p>Essentially there are 3 different formats for <code>SequenceFile</code>s
139 depending on the <code>CompressionType</code> specified. All of them share a
140 <a href="#Header">common header</a> described below.
141 
142 <h5 id="Header">SequenceFile Header</h5>
143 <ul>
144   <li>
145   version - 3 bytes of magic header <b>SEQ</b>, followed by 1 byte of actual
146             version number (e.g. SEQ4 or SEQ6)
147   </li>
148   <li>
149   keyClassName -key class
150   </li>
151   <li>
152   valueClassName - value class
153   </li>
154   <li>
155   compression - A boolean which specifies if compression is turned on for
156                 keys/values in this file.
157   </li>
158   <li>
159   blockCompression - A boolean which specifies if block-compression is
160                      turned on for keys/values in this file.
161   </li>
162   <li>
163   compression codec - <code>CompressionCodec</code> class which is used for 
164                       compression of keys and/or values (if compression is
165                       enabled).
166   </li>
167   <li>
168   metadata - <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Metadata.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile.Metadata</CODE></A> for this file.
169   </li>
170   <li>
171   sync - A sync marker to denote end of the header.
172   </li>
173 </ul>
174 
175 <h5 id="#UncompressedFormat">Uncompressed SequenceFile Format</h5>
176 <ul>
177 <li>
178 <a href="#Header">Header</a>
179 </li>
180 <li>
181 Record
182   <ul>
183     <li>Record length</li>
184     <li>Key length</li>
185     <li>Key</li>
186     <li>Value</li>
187   </ul>
188 </li>
189 <li>
190 A sync-marker every few <code>100</code> bytes or so.
191 </li>
192 </ul>
193
194 <h5 id="#RecordCompressedFormat">Record-Compressed SequenceFile Format</h5>
195 <ul>
196 <li>
197 <a href="#Header">Header</a>
198 </li>
199 <li>
200 Record
201   <ul>
202     <li>Record length</li>
203     <li>Key length</li>
204     <li>Key</li>
205     <li><i>Compressed</i> Value</li>
206   </ul>
207 </li>
208 <li>
209 A sync-marker every few <code>100</code> bytes or so.
210 </li>
211 </ul>
212 
213 <h5 id="#BlockCompressedFormat">Block-Compressed SequenceFile Format</h5>
214 <ul>
215 <li>
216 <a href="#Header">Header</a>
217 </li>
218 <li>
219 Record <i>Block</i>
220   <ul>
221     <li>Compressed key-lengths block-size</li>
222     <li>Compressed key-lengths block</li>
223     <li>Compressed keys block-size</li>
224     <li>Compressed keys block</li>
225     <li>Compressed value-lengths block-size</li>
226     <li>Compressed value-lengths block</li>
227     <li>Compressed values block-size</li>
228     <li>Compressed values block</li>
229   </ul>
230 </li>
231 <li>
232 A sync-marker every few <code>100</code> bytes or so.
233 </li>
234 </ul>
235 
236 <p>The compressed blocks of key lengths and value lengths consist of the
237 actual lengths of individual keys/values encoded in ZeroCompressedInteger
238 format.</p>
239<P>
240
241<P>
242<DL>
243<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress"><CODE>CompressionCodec</CODE></A></DL>
244<HR>
245
246<P>
247<!-- ======== NESTED CLASS SUMMARY ======== -->
248
249<A NAME="nested_class_summary"><!-- --></A>
250<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
251<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
252<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
253<B>Nested Class Summary</B></FONT></TH>
254</TR>
255<TR BGCOLOR="white" CLASS="TableRowColor">
256<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
257<CODE>static&nbsp;class</CODE></FONT></TD>
258<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A></B></CODE>
259
260<BR>
261&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The compression type used to compress key/value pairs in the
262 <A HREF="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile</CODE></A>.</TD>
263</TR>
264<TR BGCOLOR="white" CLASS="TableRowColor">
265<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
266<CODE>static&nbsp;class</CODE></FONT></TD>
267<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Metadata.html" title="class in org.apache.hadoop.io">SequenceFile.Metadata</A></B></CODE>
268
269<BR>
270&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The class encapsulating with the metadata of a file.</TD>
271</TR>
272<TR BGCOLOR="white" CLASS="TableRowColor">
273<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
274<CODE>static&nbsp;class</CODE></FONT></TD>
275<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Reader.html" title="class in org.apache.hadoop.io">SequenceFile.Reader</A></B></CODE>
276
277<BR>
278&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads key/value pairs from a sequence-format file.</TD>
279</TR>
280<TR BGCOLOR="white" CLASS="TableRowColor">
281<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
282<CODE>static&nbsp;class</CODE></FONT></TD>
283<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Sorter.html" title="class in org.apache.hadoop.io">SequenceFile.Sorter</A></B></CODE>
284
285<BR>
286&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sorts key/value pairs in a sequence-format file.</TD>
287</TR>
288<TR BGCOLOR="white" CLASS="TableRowColor">
289<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
290<CODE>static&nbsp;interface</CODE></FONT></TD>
291<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.ValueBytes.html" title="interface in org.apache.hadoop.io">SequenceFile.ValueBytes</A></B></CODE>
292
293<BR>
294&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The interface to 'raw' values of SequenceFiles.</TD>
295</TR>
296<TR BGCOLOR="white" CLASS="TableRowColor">
297<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
298<CODE>static&nbsp;class</CODE></FONT></TD>
299<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A></B></CODE>
300
301<BR>
302&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Write key/value pairs to a sequence-format file.</TD>
303</TR>
304</TABLE>
305&nbsp;<!-- =========== FIELD SUMMARY =========== -->
306
307<A NAME="field_summary"><!-- --></A>
308<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
309<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
310<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
311<B>Field Summary</B></FONT></TH>
312</TR>
313<TR BGCOLOR="white" CLASS="TableRowColor">
314<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
315<CODE>static&nbsp;int</CODE></FONT></TD>
316<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#SYNC_INTERVAL">SYNC_INTERVAL</A></B></CODE>
317
318<BR>
319&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The number of bytes between sync points.</TD>
320</TR>
321</TABLE>
322&nbsp;
323<!-- ========== METHOD SUMMARY =========== -->
324
325<A NAME="method_summary"><!-- --></A>
326<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
327<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
328<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
329<B>Method Summary</B></FONT></TH>
330</TR>
331<TR BGCOLOR="white" CLASS="TableRowColor">
332<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
333<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A></CODE></FONT></TD>
334<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#createWriter(org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.FSDataOutputStream, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec)">createWriter</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
335             <A HREF="../../../../org/apache/hadoop/fs/FSDataOutputStream.html" title="class in org.apache.hadoop.fs">FSDataOutputStream</A>&nbsp;out,
336             <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>&nbsp;keyClass,
337             <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>&nbsp;valClass,
338             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
339             <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec)</CODE>
340
341<BR>
342&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct the preferred type of 'raw' SequenceFile Writer.</TD>
343</TR>
344<TR BGCOLOR="white" CLASS="TableRowColor">
345<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
346<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A></CODE></FONT></TD>
347<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#createWriter(org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.FSDataOutputStream, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec, org.apache.hadoop.io.SequenceFile.Metadata)">createWriter</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
348             <A HREF="../../../../org/apache/hadoop/fs/FSDataOutputStream.html" title="class in org.apache.hadoop.fs">FSDataOutputStream</A>&nbsp;out,
349             <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>&nbsp;keyClass,
350             <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>&nbsp;valClass,
351             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
352             <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec,
353             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Metadata.html" title="class in org.apache.hadoop.io">SequenceFile.Metadata</A>&nbsp;metadata)</CODE>
354
355<BR>
356&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct the preferred type of 'raw' SequenceFile Writer.</TD>
357</TR>
358<TR BGCOLOR="white" CLASS="TableRowColor">
359<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
360<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A></CODE></FONT></TD>
361<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class)">createWriter</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
362             <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
363             <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
364             <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>&nbsp;keyClass,
365             <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>&nbsp;valClass)</CODE>
366
367<BR>
368&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct the preferred type of SequenceFile Writer.</TD>
369</TR>
370<TR BGCOLOR="white" CLASS="TableRowColor">
371<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
372<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A></CODE></FONT></TD>
373<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, int, short, long, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec, org.apache.hadoop.util.Progressable, org.apache.hadoop.io.SequenceFile.Metadata)">createWriter</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
374             <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
375             <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
376             <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>&nbsp;keyClass,
377             <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>&nbsp;valClass,
378             int&nbsp;bufferSize,
379             short&nbsp;replication,
380             long&nbsp;blockSize,
381             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
382             <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec,
383             <A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A>&nbsp;progress,
384             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Metadata.html" title="class in org.apache.hadoop.io">SequenceFile.Metadata</A>&nbsp;metadata)</CODE>
385
386<BR>
387&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct the preferred type of SequenceFile Writer.</TD>
388</TR>
389<TR BGCOLOR="white" CLASS="TableRowColor">
390<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
391<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A></CODE></FONT></TD>
392<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType)">createWriter</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
393             <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
394             <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
395             <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>&nbsp;keyClass,
396             <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>&nbsp;valClass,
397             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType)</CODE>
398
399<BR>
400&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct the preferred type of SequenceFile Writer.</TD>
401</TR>
402<TR BGCOLOR="white" CLASS="TableRowColor">
403<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
404<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A></CODE></FONT></TD>
405<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec)">createWriter</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
406             <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
407             <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
408             <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>&nbsp;keyClass,
409             <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>&nbsp;valClass,
410             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
411             <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec)</CODE>
412
413<BR>
414&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct the preferred type of SequenceFile Writer.</TD>
415</TR>
416<TR BGCOLOR="white" CLASS="TableRowColor">
417<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
418<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A></CODE></FONT></TD>
419<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec, org.apache.hadoop.util.Progressable)">createWriter</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
420             <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
421             <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
422             <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>&nbsp;keyClass,
423             <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>&nbsp;valClass,
424             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
425             <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec,
426             <A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A>&nbsp;progress)</CODE>
427
428<BR>
429&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct the preferred type of SequenceFile Writer.</TD>
430</TR>
431<TR BGCOLOR="white" CLASS="TableRowColor">
432<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
433<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A></CODE></FONT></TD>
434<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec, org.apache.hadoop.util.Progressable, org.apache.hadoop.io.SequenceFile.Metadata)">createWriter</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
435             <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
436             <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
437             <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>&nbsp;keyClass,
438             <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>&nbsp;valClass,
439             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
440             <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec,
441             <A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A>&nbsp;progress,
442             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Metadata.html" title="class in org.apache.hadoop.io">SequenceFile.Metadata</A>&nbsp;metadata)</CODE>
443
444<BR>
445&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct the preferred type of SequenceFile Writer.</TD>
446</TR>
447<TR BGCOLOR="white" CLASS="TableRowColor">
448<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
449<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A></CODE></FONT></TD>
450<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.util.Progressable)">createWriter</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
451             <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
452             <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
453             <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>&nbsp;keyClass,
454             <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>&nbsp;valClass,
455             <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
456             <A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A>&nbsp;progress)</CODE>
457
458<BR>
459&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct the preferred type of SequenceFile Writer.</TD>
460</TR>
461<TR BGCOLOR="white" CLASS="TableRowColor">
462<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
463<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A></CODE></FONT></TD>
464<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#getCompressionType(org.apache.hadoop.conf.Configuration)">getCompressionType</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;job)</CODE>
465
466<BR>
467&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I>Use
468             <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileOutputFormat.html#getOutputCompressionType(org.apache.hadoop.mapred.JobConf)"><CODE>SequenceFileOutputFormat.getOutputCompressionType(org.apache.hadoop.mapred.JobConf)</CODE></A> 
469             to get <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io"><CODE>SequenceFile.CompressionType</CODE></A> for job-outputs.</I></TD>
470</TR>
471<TR BGCOLOR="white" CLASS="TableRowColor">
472<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
473<CODE>static&nbsp;void</CODE></FONT></TD>
474<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SequenceFile.html#setCompressionType(org.apache.hadoop.conf.Configuration, org.apache.hadoop.io.SequenceFile.CompressionType)">setCompressionType</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;job,
475                   <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;val)</CODE>
476
477<BR>
478&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I>Use the one of the many SequenceFile.createWriter methods to specify
479             the <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io"><CODE>SequenceFile.CompressionType</CODE></A> while creating the <A HREF="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile</CODE></A> or
480             <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileOutputFormat.html#setOutputCompressionType(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.io.SequenceFile.CompressionType)"><CODE>SequenceFileOutputFormat.setOutputCompressionType(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.io.SequenceFile.CompressionType)</CODE></A>
481             to specify the <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io"><CODE>SequenceFile.CompressionType</CODE></A> for job-outputs.
482 or</I></TD>
483</TR>
484</TABLE>
485&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
486<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
487<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
488<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>
489</TR>
490<TR BGCOLOR="white" CLASS="TableRowColor">
491<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>
492</TR>
493</TABLE>
494&nbsp;
495<P>
496
497<!-- ============ FIELD DETAIL =========== -->
498
499<A NAME="field_detail"><!-- --></A>
500<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
501<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
502<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
503<B>Field Detail</B></FONT></TH>
504</TR>
505</TABLE>
506
507<A NAME="SYNC_INTERVAL"><!-- --></A><H3>
508SYNC_INTERVAL</H3>
509<PRE>
510public static final int <B>SYNC_INTERVAL</B></PRE>
511<DL>
512<DD>The number of bytes between sync points.
513<P>
514<DL>
515<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.io.SequenceFile.SYNC_INTERVAL">Constant Field Values</A></DL>
516</DL>
517
518<!-- ============ METHOD DETAIL ========== -->
519
520<A NAME="method_detail"><!-- --></A>
521<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
522<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
523<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
524<B>Method Detail</B></FONT></TH>
525</TR>
526</TABLE>
527
528<A NAME="getCompressionType(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
529getCompressionType</H3>
530<PRE>
531<FONT SIZE="-1"><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</A>
532</FONT>public static <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A> <B>getCompressionType</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;job)</PRE>
533<DL>
534<DD><B>Deprecated.</B>&nbsp;<I>Use
535             <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileOutputFormat.html#getOutputCompressionType(org.apache.hadoop.mapred.JobConf)"><CODE>SequenceFileOutputFormat.getOutputCompressionType(org.apache.hadoop.mapred.JobConf)</CODE></A> 
536             to get <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io"><CODE>SequenceFile.CompressionType</CODE></A> for job-outputs.</I>
537<P>
538<DD>Get the compression type for the reduce outputs
539<P>
540<DD><DL>
541<DT><B>Parameters:</B><DD><CODE>job</CODE> - the job config to look in
542<DT><B>Returns:</B><DD>the kind of compression to use</DL>
543</DD>
544</DL>
545<HR>
546
547<A NAME="setCompressionType(org.apache.hadoop.conf.Configuration, org.apache.hadoop.io.SequenceFile.CompressionType)"><!-- --></A><H3>
548setCompressionType</H3>
549<PRE>
550<FONT SIZE="-1"><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</A>
551</FONT>public static void <B>setCompressionType</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;job,
552                                                 <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;val)</PRE>
553<DL>
554<DD><B>Deprecated.</B>&nbsp;<I>Use the one of the many SequenceFile.createWriter methods to specify
555             the <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io"><CODE>SequenceFile.CompressionType</CODE></A> while creating the <A HREF="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile</CODE></A> or
556             <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileOutputFormat.html#setOutputCompressionType(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.io.SequenceFile.CompressionType)"><CODE>SequenceFileOutputFormat.setOutputCompressionType(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.io.SequenceFile.CompressionType)</CODE></A>
557             to specify the <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io"><CODE>SequenceFile.CompressionType</CODE></A> for job-outputs.
558 or</I>
559<P>
560<DD>Set the compression type for sequence files.
561<P>
562<DD><DL>
563<DT><B>Parameters:</B><DD><CODE>job</CODE> - the configuration to modify<DD><CODE>val</CODE> - the new compression type (none, block, record)</DL>
564</DD>
565</DL>
566<HR>
567
568<A NAME="createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class)"><!-- --></A><H3>
569createWriter</H3>
570<PRE>
571public static <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A> <B>createWriter</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
572                                               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
573                                               <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
574                                               <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>&nbsp;keyClass,
575                                               <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>&nbsp;valClass)
576                                        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>
577<DL>
578<DD>Construct the preferred type of SequenceFile Writer.
579<P>
580<DD><DL>
581<DT><B>Parameters:</B><DD><CODE>fs</CODE> - The configured filesystem.<DD><CODE>conf</CODE> - The configuration.<DD><CODE>name</CODE> - The name of the file.<DD><CODE>keyClass</CODE> - The 'key' type.<DD><CODE>valClass</CODE> - The 'value' type.
582<DT><B>Returns:</B><DD>Returns the handle to the constructed SequenceFile Writer.
583<DT><B>Throws:</B>
584<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>
585</DD>
586</DL>
587<HR>
588
589<A NAME="createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType)"><!-- --></A><H3>
590createWriter</H3>
591<PRE>
592public static <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A> <B>createWriter</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
593                                               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
594                                               <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
595                                               <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>&nbsp;keyClass,
596                                               <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>&nbsp;valClass,
597                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType)
598                                        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>
599<DL>
600<DD>Construct the preferred type of SequenceFile Writer.
601<P>
602<DD><DL>
603<DT><B>Parameters:</B><DD><CODE>fs</CODE> - The configured filesystem.<DD><CODE>conf</CODE> - The configuration.<DD><CODE>name</CODE> - The name of the file.<DD><CODE>keyClass</CODE> - The 'key' type.<DD><CODE>valClass</CODE> - The 'value' type.<DD><CODE>compressionType</CODE> - The compression type.
604<DT><B>Returns:</B><DD>Returns the handle to the constructed SequenceFile Writer.
605<DT><B>Throws:</B>
606<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>
607</DD>
608</DL>
609<HR>
610
611<A NAME="createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.util.Progressable)"><!-- --></A><H3>
612createWriter</H3>
613<PRE>
614public static <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A> <B>createWriter</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
615                                               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
616                                               <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
617                                               <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>&nbsp;keyClass,
618                                               <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>&nbsp;valClass,
619                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
620                                               <A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A>&nbsp;progress)
621                                        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>
622<DL>
623<DD>Construct the preferred type of SequenceFile Writer.
624<P>
625<DD><DL>
626<DT><B>Parameters:</B><DD><CODE>fs</CODE> - The configured filesystem.<DD><CODE>conf</CODE> - The configuration.<DD><CODE>name</CODE> - The name of the file.<DD><CODE>keyClass</CODE> - The 'key' type.<DD><CODE>valClass</CODE> - The 'value' type.<DD><CODE>compressionType</CODE> - The compression type.<DD><CODE>progress</CODE> - The Progressable object to track progress.
627<DT><B>Returns:</B><DD>Returns the handle to the constructed SequenceFile Writer.
628<DT><B>Throws:</B>
629<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>
630</DD>
631</DL>
632<HR>
633
634<A NAME="createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec)"><!-- --></A><H3>
635createWriter</H3>
636<PRE>
637public static <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A> <B>createWriter</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
638                                               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
639                                               <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
640                                               <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>&nbsp;keyClass,
641                                               <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>&nbsp;valClass,
642                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
643                                               <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec)
644                                        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>
645<DL>
646<DD>Construct the preferred type of SequenceFile Writer.
647<P>
648<DD><DL>
649<DT><B>Parameters:</B><DD><CODE>fs</CODE> - The configured filesystem.<DD><CODE>conf</CODE> - The configuration.<DD><CODE>name</CODE> - The name of the file.<DD><CODE>keyClass</CODE> - The 'key' type.<DD><CODE>valClass</CODE> - The 'value' type.<DD><CODE>compressionType</CODE> - The compression type.<DD><CODE>codec</CODE> - The compression codec.
650<DT><B>Returns:</B><DD>Returns the handle to the constructed SequenceFile Writer.
651<DT><B>Throws:</B>
652<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>
653</DD>
654</DL>
655<HR>
656
657<A NAME="createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec, org.apache.hadoop.util.Progressable, org.apache.hadoop.io.SequenceFile.Metadata)"><!-- --></A><H3>
658createWriter</H3>
659<PRE>
660public static <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A> <B>createWriter</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
661                                               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
662                                               <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
663                                               <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>&nbsp;keyClass,
664                                               <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>&nbsp;valClass,
665                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
666                                               <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec,
667                                               <A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A>&nbsp;progress,
668                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Metadata.html" title="class in org.apache.hadoop.io">SequenceFile.Metadata</A>&nbsp;metadata)
669                                        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>
670<DL>
671<DD>Construct the preferred type of SequenceFile Writer.
672<P>
673<DD><DL>
674<DT><B>Parameters:</B><DD><CODE>fs</CODE> - The configured filesystem.<DD><CODE>conf</CODE> - The configuration.<DD><CODE>name</CODE> - The name of the file.<DD><CODE>keyClass</CODE> - The 'key' type.<DD><CODE>valClass</CODE> - The 'value' type.<DD><CODE>compressionType</CODE> - The compression type.<DD><CODE>codec</CODE> - The compression codec.<DD><CODE>progress</CODE> - The Progressable object to track progress.<DD><CODE>metadata</CODE> - The metadata of the file.
675<DT><B>Returns:</B><DD>Returns the handle to the constructed SequenceFile Writer.
676<DT><B>Throws:</B>
677<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>
678</DD>
679</DL>
680<HR>
681
682<A NAME="createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, int, short, long, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec, org.apache.hadoop.util.Progressable, org.apache.hadoop.io.SequenceFile.Metadata)"><!-- --></A><H3>
683createWriter</H3>
684<PRE>
685public static <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A> <B>createWriter</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
686                                               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
687                                               <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
688                                               <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>&nbsp;keyClass,
689                                               <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>&nbsp;valClass,
690                                               int&nbsp;bufferSize,
691                                               short&nbsp;replication,
692                                               long&nbsp;blockSize,
693                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
694                                               <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec,
695                                               <A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A>&nbsp;progress,
696                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Metadata.html" title="class in org.apache.hadoop.io">SequenceFile.Metadata</A>&nbsp;metadata)
697                                        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>
698<DL>
699<DD>Construct the preferred type of SequenceFile Writer.
700<P>
701<DD><DL>
702<DT><B>Parameters:</B><DD><CODE>fs</CODE> - The configured filesystem.<DD><CODE>conf</CODE> - The configuration.<DD><CODE>name</CODE> - The name of the file.<DD><CODE>keyClass</CODE> - The 'key' type.<DD><CODE>valClass</CODE> - The 'value' type.<DD><CODE>bufferSize</CODE> - buffer size for the underlaying outputstream.<DD><CODE>replication</CODE> - replication factor for the file.<DD><CODE>blockSize</CODE> - block size for the file.<DD><CODE>compressionType</CODE> - The compression type.<DD><CODE>codec</CODE> - The compression codec.<DD><CODE>progress</CODE> - The Progressable object to track progress.<DD><CODE>metadata</CODE> - The metadata of the file.
703<DT><B>Returns:</B><DD>Returns the handle to the constructed SequenceFile Writer.
704<DT><B>Throws:</B>
705<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>
706</DD>
707</DL>
708<HR>
709
710<A NAME="createWriter(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec, org.apache.hadoop.util.Progressable)"><!-- --></A><H3>
711createWriter</H3>
712<PRE>
713public static <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A> <B>createWriter</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
714                                               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
715                                               <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;name,
716                                               <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>&nbsp;keyClass,
717                                               <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>&nbsp;valClass,
718                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
719                                               <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec,
720                                               <A HREF="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</A>&nbsp;progress)
721                                        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>
722<DL>
723<DD>Construct the preferred type of SequenceFile Writer.
724<P>
725<DD><DL>
726<DT><B>Parameters:</B><DD><CODE>fs</CODE> - The configured filesystem.<DD><CODE>conf</CODE> - The configuration.<DD><CODE>name</CODE> - The name of the file.<DD><CODE>keyClass</CODE> - The 'key' type.<DD><CODE>valClass</CODE> - The 'value' type.<DD><CODE>compressionType</CODE> - The compression type.<DD><CODE>codec</CODE> - The compression codec.<DD><CODE>progress</CODE> - The Progressable object to track progress.
727<DT><B>Returns:</B><DD>Returns the handle to the constructed SequenceFile Writer.
728<DT><B>Throws:</B>
729<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>
730</DD>
731</DL>
732<HR>
733
734<A NAME="createWriter(org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.FSDataOutputStream, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec, org.apache.hadoop.io.SequenceFile.Metadata)"><!-- --></A><H3>
735createWriter</H3>
736<PRE>
737public static <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A> <B>createWriter</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
738                                               <A HREF="../../../../org/apache/hadoop/fs/FSDataOutputStream.html" title="class in org.apache.hadoop.fs">FSDataOutputStream</A>&nbsp;out,
739                                               <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>&nbsp;keyClass,
740                                               <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>&nbsp;valClass,
741                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
742                                               <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec,
743                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Metadata.html" title="class in org.apache.hadoop.io">SequenceFile.Metadata</A>&nbsp;metadata)
744                                        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>
745<DL>
746<DD>Construct the preferred type of 'raw' SequenceFile Writer.
747<P>
748<DD><DL>
749<DT><B>Parameters:</B><DD><CODE>conf</CODE> - The configuration.<DD><CODE>out</CODE> - The stream on top which the writer is to be constructed.<DD><CODE>keyClass</CODE> - The 'key' type.<DD><CODE>valClass</CODE> - The 'value' type.<DD><CODE>compressionType</CODE> - The compression type.<DD><CODE>codec</CODE> - The compression codec.<DD><CODE>metadata</CODE> - The metadata of the file.
750<DT><B>Returns:</B><DD>Returns the handle to the constructed SequenceFile Writer.
751<DT><B>Throws:</B>
752<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>
753</DD>
754</DL>
755<HR>
756
757<A NAME="createWriter(org.apache.hadoop.conf.Configuration, org.apache.hadoop.fs.FSDataOutputStream, java.lang.Class, java.lang.Class, org.apache.hadoop.io.SequenceFile.CompressionType, org.apache.hadoop.io.compress.CompressionCodec)"><!-- --></A><H3>
758createWriter</H3>
759<PRE>
760public static <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Writer.html" title="class in org.apache.hadoop.io">SequenceFile.Writer</A> <B>createWriter</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
761                                               <A HREF="../../../../org/apache/hadoop/fs/FSDataOutputStream.html" title="class in org.apache.hadoop.fs">FSDataOutputStream</A>&nbsp;out,
762                                               <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>&nbsp;keyClass,
763                                               <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>&nbsp;valClass,
764                                               <A HREF="../../../../org/apache/hadoop/io/SequenceFile.CompressionType.html" title="enum in org.apache.hadoop.io">SequenceFile.CompressionType</A>&nbsp;compressionType,
765                                               <A HREF="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&nbsp;codec)
766                                        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>
767<DL>
768<DD>Construct the preferred type of 'raw' SequenceFile Writer.
769<P>
770<DD><DL>
771<DT><B>Parameters:</B><DD><CODE>conf</CODE> - The configuration.<DD><CODE>out</CODE> - The stream on top which the writer is to be constructed.<DD><CODE>keyClass</CODE> - The 'key' type.<DD><CODE>valClass</CODE> - The 'value' type.<DD><CODE>compressionType</CODE> - The compression type.<DD><CODE>codec</CODE> - The compression codec.
772<DT><B>Returns:</B><DD>Returns the handle to the constructed SequenceFile Writer.
773<DT><B>Throws:</B>
774<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>
775</DD>
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