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91org.apache.hadoop.mapred</FONT>
92<BR>
93Interface InputFormat&lt;K,V&gt;</H2>
94<DL>
95<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/join/ComposableInputFormat.html" title="interface in org.apache.hadoop.mapred.join">ComposableInputFormat</A>&lt;K,V&gt;</DD>
96</DL>
97<DL>
98<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/lib/CombineFileInputFormat.html" title="class in org.apache.hadoop.mapred.lib">CombineFileInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html" title="class in org.apache.hadoop.mapred.join">CompositeInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.html" title="class in org.apache.hadoop.mapred.lib.db">DBInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="class in org.apache.hadoop.mapred.lib">DelegatingInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">FileInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/KeyValueTextInputFormat.html" title="class in org.apache.hadoop.mapred">KeyValueTextInputFormat</A>, <A HREF="../../../../org/apache/hadoop/contrib/index/example/LineDocInputFormat.html" title="class in org.apache.hadoop.contrib.index.example">LineDocInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/MultiFileInputFormat.html" title="class in org.apache.hadoop.mapred">MultiFileInputFormat</A>, <A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.MyInputFormat.html" title="class in org.apache.hadoop.examples">MultiFileWordCount.MyInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/NLineInputFormat.html" title="class in org.apache.hadoop.mapred.lib">NLineInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/Parser.Node.html" title="class in org.apache.hadoop.mapred.join">Parser.Node</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsTextInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsTextInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFormat</A>, <A HREF="../../../../org/apache/hadoop/examples/SleepJob.SleepInputFormat.html" title="class in org.apache.hadoop.examples">SleepJob.SleepInputFormat</A>, <A HREF="../../../../org/apache/hadoop/streaming/StreamInputFormat.html" title="class in org.apache.hadoop.streaming">StreamInputFormat</A>, <A HREF="../../../../org/apache/hadoop/examples/terasort/TeraInputFormat.html" title="class in org.apache.hadoop.examples.terasort">TeraInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/TextInputFormat.html" title="class in org.apache.hadoop.mapred">TextInputFormat</A></DD>
99</DL>
100<HR>
101<B>Deprecated.</B>&nbsp;<I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputFormat</CODE></A> instead.</I>
102<P>
103<DL>
104<DT><PRE><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>
105</FONT>public interface <B>InputFormat&lt;K,V&gt;</B></DL>
106</PRE>
107
108<P>
109<code>InputFormat</code> describes the input-specification for a
110 Map-Reduce job.
111 
112 <p>The Map-Reduce framework relies on the <code>InputFormat</code> of the
113 job to:<p>
114 <ol>
115   <li>
116   Validate the input-specification of the job.
117   <li>
118   Split-up the input file(s) into logical <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>s, each of
119   which is then assigned to an individual <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A>.
120   </li>
121   <li>
122   Provide the <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> implementation to be used to glean
123   input records from the logical <code>InputSplit</code> for processing by
124   the <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A>.
125   </li>
126 </ol>
127 
128 <p>The default behavior of file-based <A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A>s, typically
129 sub-classes of <A HREF="../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred"><CODE>FileInputFormat</CODE></A>, is to split the
130 input into <i>logical</i> <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>s based on the total size, in
131 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 
132 the input files is treated as an upper bound for input splits. A lower bound
133 on the split size can be set via
134 <a href="../../../../../mapred-default.html#mapred.min.split.size">
135 mapred.min.split.size</a>.</p>
136 
137 <p>Clearly, logical splits based on input-size is insufficient for many
138 applications since record boundaries are to respected. In such cases, the
139 application has to also implement a <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> on whom lies the
140 responsibilty to respect record-boundaries and present a record-oriented
141 view of the logical <code>InputSplit</code> to the individual task.
142<P>
143
144<P>
145<DL>
146<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>,
147<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A>,
148<A HREF="../../../../org/apache/hadoop/mapred/JobClient.html" title="class in org.apache.hadoop.mapred"><CODE>JobClient</CODE></A>,
149<A HREF="../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred"><CODE>FileInputFormat</CODE></A></DL>
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151
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160<B>Method Summary</B></FONT></TH>
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164<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A>&lt;<A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="type parameter in InputFormat">K</A>,<A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="type parameter in InputFormat">V</A>&gt;</CODE></FONT></TD>
165<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html#getRecordReader(org.apache.hadoop.mapred.InputSplit, org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.Reporter)">getRecordReader</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>&nbsp;split,
166                <A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
167                <A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
168
169<BR>
170&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;Get the <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> for the given <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>.</TD>
171</TR>
172<TR BGCOLOR="white" CLASS="TableRowColor">
173<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
174<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>[]</CODE></FONT></TD>
175<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html#getSplits(org.apache.hadoop.mapred.JobConf, int)">getSplits</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
176          int&nbsp;numSplits)</CODE>
177
178<BR>
179&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;Logically split the set of input files for the job.</TD>
180</TR>
181</TABLE>
182&nbsp;
183<P>
184
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194
195<A NAME="getSplits(org.apache.hadoop.mapred.JobConf, int)"><!-- --></A><H3>
196getSplits</H3>
197<PRE>
198<A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>[] <B>getSplits</B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
199                       int&nbsp;numSplits)
200                       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>
201<DL>
202<DD><B>Deprecated.</B>&nbsp;<DD>Logically split the set of input files for the job. 
203 
204 <p>Each <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A> is then assigned to an individual <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A>
205 for processing.</p>
206
207 <p><i>Note</i>: The split is a <i>logical</i> split of the inputs and the
208 input files are not physically split into chunks. For e.g. a split could
209 be <i>&lt;input-file-path, start, offset&gt;</i> tuple.
210<P>
211<DD><DL>
212<DT><B>Parameters:</B><DD><CODE>job</CODE> - job configuration.<DD><CODE>numSplits</CODE> - the desired number of splits, a hint.
213<DT><B>Returns:</B><DD>an array of <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>s for the job.
214<DT><B>Throws:</B>
215<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>
216</DD>
217</DL>
218<HR>
219
220<A NAME="getRecordReader(org.apache.hadoop.mapred.InputSplit, org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
221getRecordReader</H3>
222<PRE>
223<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A>&lt;<A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="type parameter in InputFormat">K</A>,<A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="type parameter in InputFormat">V</A>&gt; <B>getRecordReader</B>(<A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>&nbsp;split,
224                                  <A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
225                                  <A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
226                                  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>
227<DL>
228<DD><B>Deprecated.</B>&nbsp;<DD>Get the <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> for the given <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>.
229
230 <p>It is the responsibility of the <code>RecordReader</code> to respect
231 record boundaries while processing the logical split to present a
232 record-oriented view to the individual task.</p>
233<P>
234<DD><DL>
235<DT><B>Parameters:</B><DD><CODE>split</CODE> - the <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A><DD><CODE>job</CODE> - the job that this split belongs to
236<DT><B>Returns:</B><DD>a <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A>
237<DT><B>Throws:</B>
238<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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