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7CompositeInputFormat (Hadoop 0.20.1 API)
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89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.mapred.join</FONT>
92<BR>
93Class CompositeInputFormat&lt;K extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&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.mapred.join.CompositeInputFormat&lt;K&gt;</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A>&lt;K,<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&gt;, <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableInputFormat.html" title="interface in org.apache.hadoop.mapred.join">ComposableInputFormat</A>&lt;K,<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&gt;</DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>CompositeInputFormat&lt;K extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&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><DT>implements <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableInputFormat.html" title="interface in org.apache.hadoop.mapred.join">ComposableInputFormat</A>&lt;K,<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&gt;</DL>
104</PRE>
105
106<P>
107An InputFormat capable of performing joins over a set of data sources sorted
108 and partitioned the same way.
109<P>
110
111<P>
112<DL>
113<DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html#setFormat(org.apache.hadoop.mapred.JobConf)"><CODE>A user may define new join types by setting the property
114 <tt>mapred.join.define.&lt;ident&gt;</tt> to a classname. In the expression
115 <tt>mapred.join.expr</tt>, the identifier will be assumed to be a
116 ComposableRecordReader.
117 <tt>mapred.join.keycomparator</tt> can be a classname used to compare keys
118 in the join.</CODE></A>,
119<A HREF="../../../../../org/apache/hadoop/mapred/join/JoinRecordReader.html" title="class in org.apache.hadoop.mapred.join"><CODE>JoinRecordReader</CODE></A>,
120<A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join"><CODE>MultiFilterRecordReader</CODE></A></DL>
121<HR>
122
123<P>
124
125<!-- ======== CONSTRUCTOR SUMMARY ======== -->
126
127<A NAME="constructor_summary"><!-- --></A>
128<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
129<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
130<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
131<B>Constructor Summary</B></FONT></TH>
132</TR>
133<TR BGCOLOR="white" CLASS="TableRowColor">
134<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html#CompositeInputFormat()">CompositeInputFormat</A></B>()</CODE>
135
136<BR>
137&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
138</TR>
139</TABLE>
140&nbsp;
141<!-- ========== METHOD SUMMARY =========== -->
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147<B>Method Summary</B></FONT></TH>
148</TR>
149<TR BGCOLOR="white" CLASS="TableRowColor">
150<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
151<CODE>protected &nbsp;void</CODE></FONT></TD>
152<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html#addDefaults()">addDefaults</A></B>()</CODE>
153
154<BR>
155&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Adds the default set of identifiers to the parser.</TD>
156</TR>
157<TR BGCOLOR="white" CLASS="TableRowColor">
158<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
159<CODE>static&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
160<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html#compose(java.lang.Class, java.lang.String)">compose</A></B>(<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>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A>&gt;&nbsp;inf,
161        <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;path)</CODE>
162
163<BR>
164&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Convenience method for constructing composite formats.</TD>
165</TR>
166<TR BGCOLOR="white" CLASS="TableRowColor">
167<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
168<CODE>static&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
169<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html#compose(java.lang.String, java.lang.Class, org.apache.hadoop.fs.Path...)">compose</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;op,
170        <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>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A>&gt;&nbsp;inf,
171        <A HREF="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>...&nbsp;path)</CODE>
172
173<BR>
174&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Convenience method for constructing composite formats.</TD>
175</TR>
176<TR BGCOLOR="white" CLASS="TableRowColor">
177<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
178<CODE>static&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
179<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html#compose(java.lang.String, java.lang.Class, java.lang.String...)">compose</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;op,
180        <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>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A>&gt;&nbsp;inf,
181        <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>...&nbsp;path)</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Convenience method for constructing composite formats.</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="interface in org.apache.hadoop.mapred.join">ComposableRecordReader</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html" title="type parameter in CompositeInputFormat">K</A>,<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&gt;</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.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,
190                <A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
191                <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)</CODE>
192
193<BR>
194&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct a CompositeRecordReader for the children of this InputFormat
195 as defined in the init expression.</TD>
196</TR>
197<TR BGCOLOR="white" CLASS="TableRowColor">
198<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
199<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>[]</CODE></FONT></TD>
200<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.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,
201          int&nbsp;numSplits)</CODE>
202
203<BR>
204&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Build a CompositeInputSplit from the child InputFormats by assigning the
205 ith split from each child to the ith composite split.</TD>
206</TR>
207<TR BGCOLOR="white" CLASS="TableRowColor">
208<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
209<CODE>&nbsp;void</CODE></FONT></TD>
210<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html#setFormat(org.apache.hadoop.mapred.JobConf)">setFormat</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</CODE>
211
212<BR>
213&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interpret a given string as a composite expression.</TD>
214</TR>
215</TABLE>
216&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
217<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
218<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
219<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>
220</TR>
221<TR BGCOLOR="white" CLASS="TableRowColor">
222<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>
223</TR>
224</TABLE>
225&nbsp;
226<P>
227
228<!-- ========= CONSTRUCTOR DETAIL ======== -->
229
230<A NAME="constructor_detail"><!-- --></A>
231<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
232<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
233<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
234<B>Constructor Detail</B></FONT></TH>
235</TR>
236</TABLE>
237
238<A NAME="CompositeInputFormat()"><!-- --></A><H3>
239CompositeInputFormat</H3>
240<PRE>
241public <B>CompositeInputFormat</B>()</PRE>
242<DL>
243</DL>
244
245<!-- ============ METHOD DETAIL ========== -->
246
247<A NAME="method_detail"><!-- --></A>
248<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
249<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
250<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
251<B>Method Detail</B></FONT></TH>
252</TR>
253</TABLE>
254
255<A NAME="setFormat(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
256setFormat</H3>
257<PRE>
258public void <B>setFormat</B>(<A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)
259               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>
260<DL>
261<DD>Interpret a given string as a composite expression.
262 <code>func  ::= &lt;ident&gt;([&lt;func&gt;,]*&lt;func&gt;)
263   func  ::= tbl(&lt;class&gt;,"&lt;path&gt;")
264   class ::= @see java.lang.Class#forName(java.lang.String)
265   path  ::= @see org.apache.hadoop.fs.Path#Path(java.lang.String)
266 </code>
267 Reads expression from the <tt>mapred.join.expr</tt> property and
268 user-supplied join types from <tt>mapred.join.define.&lt;ident&gt;</tt>
269  types. Paths supplied to <tt>tbl</tt> are given as input paths to the
270 InputFormat class listed.
271<P>
272<DD><DL>
273</DL>
274</DD>
275<DD><DL>
276
277<DT><B>Throws:</B>
278<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><DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html#compose(java.lang.String, java.lang.Class, java.lang.String...)"><CODE>compose(java.lang.String, java.lang.Class, java.lang.String...)</CODE></A></DL>
279</DD>
280</DL>
281<HR>
282
283<A NAME="addDefaults()"><!-- --></A><H3>
284addDefaults</H3>
285<PRE>
286protected void <B>addDefaults</B>()</PRE>
287<DL>
288<DD>Adds the default set of identifiers to the parser.
289<P>
290<DD><DL>
291</DL>
292</DD>
293<DD><DL>
294</DL>
295</DD>
296</DL>
297<HR>
298
299<A NAME="getSplits(org.apache.hadoop.mapred.JobConf, int)"><!-- --></A><H3>
300getSplits</H3>
301<PRE>
302public <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,
303                              int&nbsp;numSplits)
304                       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>
305<DL>
306<DD>Build a CompositeInputSplit from the child InputFormats by assigning the
307 ith split from each child to the ith composite split.
308<P>
309<DD><DL>
310<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html#getSplits(org.apache.hadoop.mapred.JobConf, int)">getSplits</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html" title="type parameter in CompositeInputFormat">K</A> extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&gt;</CODE></DL>
311</DD>
312<DD><DL>
313<DT><B>Parameters:</B><DD><CODE>job</CODE> - job configuration.<DD><CODE>numSplits</CODE> - the desired number of splits, a hint.
314<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.
315<DT><B>Throws:</B>
316<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>
317</DD>
318</DL>
319<HR>
320
321<A NAME="getRecordReader(org.apache.hadoop.mapred.InputSplit, org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3>
322getRecordReader</H3>
323<PRE>
324public <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="interface in org.apache.hadoop.mapred.join">ComposableRecordReader</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html" title="type parameter in CompositeInputFormat">K</A>,<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&gt; <B>getRecordReader</B>(<A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>&nbsp;split,
325                                                               <A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
326                                                               <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A>&nbsp;reporter)
327                                                                                   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>
328<DL>
329<DD>Construct a CompositeRecordReader for the children of this InputFormat
330 as defined in the init expression.
331 The outermost join need only be composable, not necessarily a composite.
332 Mandating TupleWritable isn't strictly correct.
333<P>
334<DD><DL>
335<DT><B>Specified by:</B><DD><CODE><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></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html" title="type parameter in CompositeInputFormat">K</A> extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&gt;</CODE><DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableInputFormat.html#getRecordReader(org.apache.hadoop.mapred.InputSplit, org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.Reporter)">getRecordReader</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableInputFormat.html" title="interface in org.apache.hadoop.mapred.join">ComposableInputFormat</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html" title="type parameter in CompositeInputFormat">K</A> extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&gt;</CODE></DL>
336</DD>
337<DD><DL>
338<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
339<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>
340<DT><B>Throws:</B>
341<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>
342</DD>
343</DL>
344<HR>
345
346<A NAME="compose(java.lang.Class, java.lang.String)"><!-- --></A><H3>
347compose</H3>
348<PRE>
349public static <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>compose</B>(<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>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A>&gt;&nbsp;inf,
350                             <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;path)</PRE>
351<DL>
352<DD>Convenience method for constructing composite formats.
353 Given InputFormat class (inf), path (p) return:
354 <code>tbl(&lt;inf&gt;, &lt;p&gt;) </code>
355<P>
356<DD><DL>
357</DL>
358</DD>
359<DD><DL>
360</DL>
361</DD>
362</DL>
363<HR>
364
365<A NAME="compose(java.lang.String, java.lang.Class, java.lang.String...)"><!-- --></A><H3>
366compose</H3>
367<PRE>
368public static <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>compose</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;op,
369                             <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>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A>&gt;&nbsp;inf,
370                             <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>...&nbsp;path)</PRE>
371<DL>
372<DD>Convenience method for constructing composite formats.
373 Given operation (op), Object class (inf), set of paths (p) return:
374 <code>&lt;op&gt;(tbl(&lt;inf&gt;,&lt;p1&gt;),tbl(&lt;inf&gt;,&lt;p2&gt;),...,tbl(&lt;inf&gt;,&lt;pn&gt;)) </code>
375<P>
376<DD><DL>
377</DL>
378</DD>
379<DD><DL>
380</DL>
381</DD>
382</DL>
383<HR>
384
385<A NAME="compose(java.lang.String, java.lang.Class, org.apache.hadoop.fs.Path...)"><!-- --></A><H3>
386compose</H3>
387<PRE>
388public static <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>compose</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;op,
389                             <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>&lt;? extends <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A>&gt;&nbsp;inf,
390                             <A HREF="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>...&nbsp;path)</PRE>
391<DL>
392<DD>Convenience method for constructing composite formats.
393 Given operation (op), Object class (inf), set of paths (p) return:
394 <code>&lt;op&gt;(tbl(&lt;inf&gt;,&lt;p1&gt;),tbl(&lt;inf&gt;,&lt;p2&gt;),...,tbl(&lt;inf&gt;,&lt;pn&gt;)) </code>
395<P>
396<DD><DL>
397</DL>
398</DD>
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