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91org.apache.hadoop.mapreduce</FONT>
92<BR>
93Class InputFormat&lt;K,V&gt;</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.mapreduce.InputFormat&lt;K,V&gt;</B>
97</PRE>
98<DL>
99<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/FileInputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.input">FileInputFormat</A></DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public abstract class <B>InputFormat&lt;K,V&gt;</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>
104</PRE>
105
106<P>
107<code>InputFormat</code> describes the input-specification for a
108 Map-Reduce job.
109 
110 <p>The Map-Reduce framework relies on the <code>InputFormat</code> of the
111 job to:<p>
112 <ol>
113   <li>
114   Validate the input-specification of the job.
115   <li>
116   Split-up the input file(s) into logical <A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputSplit</CODE></A>s, each of
117   which is then assigned to an individual <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A>.
118   </li>
119   <li>
120   Provide the <A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="class in org.apache.hadoop.mapreduce"><CODE>RecordReader</CODE></A> implementation to be used to glean
121   input records from the logical <code>InputSplit</code> for processing by
122   the <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A>.
123   </li>
124 </ol>
125 
126 <p>The default behavior of file-based <A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputFormat</CODE></A>s, typically
127 sub-classes of <A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/FileInputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>FileInputFormat</CODE></A>, is to split the
128 input into <i>logical</i> <A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputSplit</CODE></A>s based on the total size, in
129 bytes, of the input files. However, the <A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs"><CODE>FileSystem</CODE></A> blocksize of 
130 the input files is treated as an upper bound for input splits. A lower bound
131 on the split size can be set via
132 <a href="../../../../../mapred-default.html#mapred.min.split.size">
133 mapred.min.split.size</a>.</p>
134 
135 <p>Clearly, logical splits based on input-size is insufficient for many
136 applications since record boundaries are to respected. In such cases, the
137 application has to also implement a <A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="class in org.apache.hadoop.mapreduce"><CODE>RecordReader</CODE></A> on whom lies the
138 responsibility to respect record-boundaries and present a record-oriented
139 view of the logical <code>InputSplit</code> to the individual task.
140<P>
141
142<P>
143<DL>
144<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputSplit</CODE></A>,
145<A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="class in org.apache.hadoop.mapreduce"><CODE>RecordReader</CODE></A>,
146<A HREF="../../../../org/apache/hadoop/mapreduce/lib/input/FileInputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.input"><CODE>FileInputFormat</CODE></A></DL>
147<HR>
148
149<P>
150
151<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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159<TR BGCOLOR="white" CLASS="TableRowColor">
160<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html#InputFormat()">InputFormat</A></B>()</CODE>
161
162<BR>
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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167<!-- ========== METHOD SUMMARY =========== -->
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173<B>Method Summary</B></FONT></TH>
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177<CODE>abstract &nbsp;<A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="class in org.apache.hadoop.mapreduce">RecordReader</A>&lt;<A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="type parameter in InputFormat">K</A>,<A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="type parameter in InputFormat">V</A>&gt;</CODE></FONT></TD>
178<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html#createRecordReader(org.apache.hadoop.mapreduce.InputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext)">createRecordReader</A></B>(<A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce">InputSplit</A>&nbsp;split,
179                   <A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;context)</CODE>
180
181<BR>
182&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create a record reader for a given split.</TD>
183</TR>
184<TR BGCOLOR="white" CLASS="TableRowColor">
185<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
186<CODE>abstract &nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce">InputSplit</A>&gt;</CODE></FONT></TD>
187<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html#getSplits(org.apache.hadoop.mapreduce.JobContext)">getSplits</A></B>(<A HREF="../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;context)</CODE>
188
189<BR>
190&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Logically split the set of input files for the job.</TD>
191</TR>
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200</TR>
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211<B>Constructor Detail</B></FONT></TH>
212</TR>
213</TABLE>
214
215<A NAME="InputFormat()"><!-- --></A><H3>
216InputFormat</H3>
217<PRE>
218public <B>InputFormat</B>()</PRE>
219<DL>
220</DL>
221
222<!-- ============ METHOD DETAIL ========== -->
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228<B>Method Detail</B></FONT></TH>
229</TR>
230</TABLE>
231
232<A NAME="getSplits(org.apache.hadoop.mapreduce.JobContext)"><!-- --></A><H3>
233getSplits</H3>
234<PRE>
235public abstract <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce">InputSplit</A>&gt; <B>getSplits</B>(<A HREF="../../../../org/apache/hadoop/mapreduce/JobContext.html" title="class in org.apache.hadoop.mapreduce">JobContext</A>&nbsp;context)
236                                    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>,
237                                           <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
238<DL>
239<DD>Logically split the set of input files for the job. 
240 
241 <p>Each <A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputSplit</CODE></A> is then assigned to an individual <A HREF="../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce"><CODE>Mapper</CODE></A>
242 for processing.</p>
243
244 <p><i>Note</i>: The split is a <i>logical</i> split of the inputs and the
245 input files are not physically split into chunks. For e.g. a split could
246 be <i>&lt;input-file-path, start, offset&gt;</i> tuple. The InputFormat
247 also creates the <A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="class in org.apache.hadoop.mapreduce"><CODE>RecordReader</CODE></A> to read the <A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputSplit</CODE></A>.
248<P>
249<DD><DL>
250<DT><B>Parameters:</B><DD><CODE>context</CODE> - job configuration.
251<DT><B>Returns:</B><DD>an array of <A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputSplit</CODE></A>s for the job.
252<DT><B>Throws:</B>
253<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>
254<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL>
255</DD>
256</DL>
257<HR>
258
259<A NAME="createRecordReader(org.apache.hadoop.mapreduce.InputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext)"><!-- --></A><H3>
260createRecordReader</H3>
261<PRE>
262public abstract <A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="class in org.apache.hadoop.mapreduce">RecordReader</A>&lt;<A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="type parameter in InputFormat">K</A>,<A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="type parameter in InputFormat">V</A>&gt; <B>createRecordReader</B>(<A HREF="../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce">InputSplit</A>&nbsp;split,
263                                                     <A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="class in org.apache.hadoop.mapreduce">TaskAttemptContext</A>&nbsp;context)
264                                              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>,
265                                                     <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
266<DL>
267<DD>Create a record reader for a given split. The framework will call
268 <A HREF="../../../../org/apache/hadoop/mapreduce/RecordReader.html#initialize(org.apache.hadoop.mapreduce.InputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext)"><CODE>RecordReader.initialize(InputSplit, TaskAttemptContext)</CODE></A> before
269 the split is used.
270<P>
271<DD><DL>
272<DT><B>Parameters:</B><DD><CODE>split</CODE> - the split to be read<DD><CODE>context</CODE> - the information about the task
273<DT><B>Returns:</B><DD>a new record reader
274<DT><B>Throws:</B>
275<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>
276<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL>
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