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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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7org.apache.hadoop.fs (Hadoop 0.20.1 API)
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10<META NAME="date" CONTENT="2009-09-01">
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82<H2>
83Package org.apache.hadoop.fs
84</H2>
85An abstract file system API.
86<P>
87<B>See:</B>
88<BR>
89&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<A HREF="#package_description"><B>Description</B></A>
90<P>
91
92<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
93<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
94<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
95<B>Interface Summary</B></FONT></TH>
96</TR>
97<TR BGCOLOR="white" CLASS="TableRowColor">
98<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/PathFilter.html" title="interface in org.apache.hadoop.fs">PathFilter</A></B></TD>
99<TD>&nbsp;</TD>
100</TR>
101<TR BGCOLOR="white" CLASS="TableRowColor">
102<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html" title="interface in org.apache.hadoop.fs">PositionedReadable</A></B></TD>
103<TD>Stream that permits positional reading.</TD>
104</TR>
105<TR BGCOLOR="white" CLASS="TableRowColor">
106<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/Seekable.html" title="interface in org.apache.hadoop.fs">Seekable</A></B></TD>
107<TD>Stream that permits seeking.</TD>
108</TR>
109<TR BGCOLOR="white" CLASS="TableRowColor">
110<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/Syncable.html" title="interface in org.apache.hadoop.fs">Syncable</A></B></TD>
111<TD>This interface declare the sync() operation.</TD>
112</TR>
113</TABLE>
114&nbsp;
115
116<P>
117
118<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
119<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
120<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
121<B>Class Summary</B></FONT></TH>
122</TR>
123<TR BGCOLOR="white" CLASS="TableRowColor">
124<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/BlockLocation.html" title="class in org.apache.hadoop.fs">BlockLocation</A></B></TD>
125<TD>&nbsp;</TD>
126</TR>
127<TR BGCOLOR="white" CLASS="TableRowColor">
128<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/BufferedFSInputStream.html" title="class in org.apache.hadoop.fs">BufferedFSInputStream</A></B></TD>
129<TD>A class optimizes reading from FSInputStream by bufferring</TD>
130</TR>
131<TR BGCOLOR="white" CLASS="TableRowColor">
132<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/ChecksumFileSystem.html" title="class in org.apache.hadoop.fs">ChecksumFileSystem</A></B></TD>
133<TD>Abstract Checksumed FileSystem.</TD>
134</TR>
135<TR BGCOLOR="white" CLASS="TableRowColor">
136<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/ContentSummary.html" title="class in org.apache.hadoop.fs">ContentSummary</A></B></TD>
137<TD>Store the summary of a content (a directory or a file).</TD>
138</TR>
139<TR BGCOLOR="white" CLASS="TableRowColor">
140<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/DF.html" title="class in org.apache.hadoop.fs">DF</A></B></TD>
141<TD>Filesystem disk space usage statistics.</TD>
142</TR>
143<TR BGCOLOR="white" CLASS="TableRowColor">
144<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/DU.html" title="class in org.apache.hadoop.fs">DU</A></B></TD>
145<TD>Filesystem disk space usage statistics.</TD>
146</TR>
147<TR BGCOLOR="white" CLASS="TableRowColor">
148<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FileChecksum.html" title="class in org.apache.hadoop.fs">FileChecksum</A></B></TD>
149<TD>An abstract class representing file checksums for files.</TD>
150</TR>
151<TR BGCOLOR="white" CLASS="TableRowColor">
152<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FileStatus.html" title="class in org.apache.hadoop.fs">FileStatus</A></B></TD>
153<TD>Interface that represents the client side information for a file.</TD>
154</TR>
155<TR BGCOLOR="white" CLASS="TableRowColor">
156<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A></B></TD>
157<TD>An abstract base class for a fairly generic filesystem.</TD>
158</TR>
159<TR BGCOLOR="white" CLASS="TableRowColor">
160<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FileSystem.Statistics.html" title="class in org.apache.hadoop.fs">FileSystem.Statistics</A></B></TD>
161<TD>&nbsp;</TD>
162</TR>
163<TR BGCOLOR="white" CLASS="TableRowColor">
164<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FileUtil.html" title="class in org.apache.hadoop.fs">FileUtil</A></B></TD>
165<TD>A collection of file-processing util methods</TD>
166</TR>
167<TR BGCOLOR="white" CLASS="TableRowColor">
168<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FileUtil.HardLink.html" title="class in org.apache.hadoop.fs">FileUtil.HardLink</A></B></TD>
169<TD>Class for creating hardlinks.</TD>
170</TR>
171<TR BGCOLOR="white" CLASS="TableRowColor">
172<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FilterFileSystem.html" title="class in org.apache.hadoop.fs">FilterFileSystem</A></B></TD>
173<TD>A <code>FilterFileSystem</code> contains
174 some other file system, which it uses as
175 its  basic file system, possibly transforming
176 the data along the way or providing  additional
177 functionality.</TD>
178</TR>
179<TR BGCOLOR="white" CLASS="TableRowColor">
180<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FSDataInputStream.html" title="class in org.apache.hadoop.fs">FSDataInputStream</A></B></TD>
181<TD>Utility that wraps a <A HREF="../../../../org/apache/hadoop/fs/FSInputStream.html" title="class in org.apache.hadoop.fs"><CODE>FSInputStream</CODE></A> in a <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true" title="class or interface in java.io"><CODE>DataInputStream</CODE></A>
182 and buffers input through a <A HREF="http://java.sun.com/javase/6/docs/api/java/io/BufferedInputStream.html?is-external=true" title="class or interface in java.io"><CODE>BufferedInputStream</CODE></A>.</TD>
183</TR>
184<TR BGCOLOR="white" CLASS="TableRowColor">
185<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FSDataOutputStream.html" title="class in org.apache.hadoop.fs">FSDataOutputStream</A></B></TD>
186<TD>Utility that wraps a <A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><CODE>OutputStream</CODE></A> in a <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutputStream.html?is-external=true" title="class or interface in java.io"><CODE>DataOutputStream</CODE></A>,
187 buffers output through a <A HREF="http://java.sun.com/javase/6/docs/api/java/io/BufferedOutputStream.html?is-external=true" title="class or interface in java.io"><CODE>BufferedOutputStream</CODE></A> and creates a checksum
188 file.</TD>
189</TR>
190<TR BGCOLOR="white" CLASS="TableRowColor">
191<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FSInputChecker.html" title="class in org.apache.hadoop.fs">FSInputChecker</A></B></TD>
192<TD>This is a generic input stream for verifying checksums for
193 data before it is read by a user.</TD>
194</TR>
195<TR BGCOLOR="white" CLASS="TableRowColor">
196<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FSInputStream.html" title="class in org.apache.hadoop.fs">FSInputStream</A></B></TD>
197<TD>FSInputStream is a generic old InputStream with a little bit
198 of RAF-style seek ability.</TD>
199</TR>
200<TR BGCOLOR="white" CLASS="TableRowColor">
201<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FSOutputSummer.html" title="class in org.apache.hadoop.fs">FSOutputSummer</A></B></TD>
202<TD>This is a generic output stream for generating checksums for
203 data before it is written to the underlying stream</TD>
204</TR>
205<TR BGCOLOR="white" CLASS="TableRowColor">
206<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FsShell.html" title="class in org.apache.hadoop.fs">FsShell</A></B></TD>
207<TD>Provide command line access to a FileSystem.</TD>
208</TR>
209<TR BGCOLOR="white" CLASS="TableRowColor">
210<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FsUrlStreamHandlerFactory.html" title="class in org.apache.hadoop.fs">FsUrlStreamHandlerFactory</A></B></TD>
211<TD>Factory for URL stream handlers.</TD>
212</TR>
213<TR BGCOLOR="white" CLASS="TableRowColor">
214<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/HarFileSystem.html" title="class in org.apache.hadoop.fs">HarFileSystem</A></B></TD>
215<TD>This is an implementation of the Hadoop Archive
216 Filesystem.</TD>
217</TR>
218<TR BGCOLOR="white" CLASS="TableRowColor">
219<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/InMemoryFileSystem.html" title="class in org.apache.hadoop.fs">InMemoryFileSystem</A></B></TD>
220<TD><B>Deprecated.</B></TD>
221</TR>
222<TR BGCOLOR="white" CLASS="TableRowColor">
223<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/LocalDirAllocator.html" title="class in org.apache.hadoop.fs">LocalDirAllocator</A></B></TD>
224<TD>An implementation of a round-robin scheme for disk allocation for creating
225 files.</TD>
226</TR>
227<TR BGCOLOR="white" CLASS="TableRowColor">
228<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/LocalFileSystem.html" title="class in org.apache.hadoop.fs">LocalFileSystem</A></B></TD>
229<TD>Implement the FileSystem API for the checksumed local filesystem.</TD>
230</TR>
231<TR BGCOLOR="white" CLASS="TableRowColor">
232<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/MD5MD5CRC32FileChecksum.html" title="class in org.apache.hadoop.fs">MD5MD5CRC32FileChecksum</A></B></TD>
233<TD>MD5 of MD5 of CRC32.</TD>
234</TR>
235<TR BGCOLOR="white" CLASS="TableRowColor">
236<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A></B></TD>
237<TD>Names a file or directory in a <A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs"><CODE>FileSystem</CODE></A>.</TD>
238</TR>
239<TR BGCOLOR="white" CLASS="TableRowColor">
240<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/RawLocalFileSystem.html" title="class in org.apache.hadoop.fs">RawLocalFileSystem</A></B></TD>
241<TD>Implement the FileSystem API for the raw local filesystem.</TD>
242</TR>
243<TR BGCOLOR="white" CLASS="TableRowColor">
244<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/Trash.html" title="class in org.apache.hadoop.fs">Trash</A></B></TD>
245<TD>Provides a <i>trash</i> feature.</TD>
246</TR>
247</TABLE>
248&nbsp;
249
250<P>
251
252<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
253<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
254<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
255<B>Exception Summary</B></FONT></TH>
256</TR>
257<TR BGCOLOR="white" CLASS="TableRowColor">
258<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/ChecksumException.html" title="class in org.apache.hadoop.fs">ChecksumException</A></B></TD>
259<TD>Thrown for checksum errors.</TD>
260</TR>
261</TABLE>
262&nbsp;
263
264<P>
265
266<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
267<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
268<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
269<B>Error Summary</B></FONT></TH>
270</TR>
271<TR BGCOLOR="white" CLASS="TableRowColor">
272<TD WIDTH="15%"><B><A HREF="../../../../org/apache/hadoop/fs/FSError.html" title="class in org.apache.hadoop.fs">FSError</A></B></TD>
273<TD>Thrown for unexpected filesystem errors, presumed to reflect disk errors
274 in the native filesystem.</TD>
275</TR>
276</TABLE>
277&nbsp;
278
279<P>
280<A NAME="package_description"><!-- --></A><H2>
281Package org.apache.hadoop.fs Description
282</H2>
283
284<P>
285An abstract file system API.
286<P>
287
288<P>
289<DL>
290</DL>
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