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88<!-- ======== START OF CLASS DATA ======== -->
89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.mapred.join</FONT>
92<BR>
93Class CompositeRecordReader&lt;K extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,V extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>,X extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</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.CompositeRecordReader&lt;K,V,X&gt;</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></DD>
100</DL>
101<DL>
102<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../org/apache/hadoop/mapred/join/JoinRecordReader.html" title="class in org.apache.hadoop.mapred.join">JoinRecordReader</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader</A></DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>public abstract class <B>CompositeRecordReader&lt;K extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,V extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>,X extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</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/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></DL>
107</PRE>
108
109<P>
110A RecordReader that can effect joins of RecordReaders sharing a common key
111 type and partitioning.
112<P>
113
114<P>
115<HR>
116
117<P>
118<!-- =========== FIELD SUMMARY =========== -->
119
120<A NAME="field_summary"><!-- --></A>
121<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
122<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
123<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
124<B>Field Summary</B></FONT></TH>
125</TR>
126<TR BGCOLOR="white" CLASS="TableRowColor">
127<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
128<CODE>protected &nbsp;org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector</CODE></FONT></TD>
129<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#jc">jc</A></B></CODE>
130
131<BR>
132&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
133</TR>
134<TR BGCOLOR="white" CLASS="TableRowColor">
135<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
136<CODE>protected &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/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>,? extends <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">V</A>&gt;[]</CODE></FONT></TD>
137<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#kids">kids</A></B></CODE>
138
139<BR>
140&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
141</TR>
142</TABLE>
143&nbsp;
144<!-- ======== CONSTRUCTOR SUMMARY ======== -->
145
146<A NAME="constructor_summary"><!-- --></A>
147<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
148<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
149<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
150<B>Constructor Summary</B></FONT></TH>
151</TR>
152<TR BGCOLOR="white" CLASS="TableRowColor">
153<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#CompositeRecordReader(int, int, java.lang.Class)">CompositeRecordReader</A></B>(int&nbsp;id,
154                      int&nbsp;capacity,
155                      <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/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&gt;&nbsp;cmpcl)</CODE>
156
157<BR>
158&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create a RecordReader with <tt>capacity</tt> children to position
159 <tt>id</tt> in the parent reader.</TD>
160</TR>
161</TABLE>
162&nbsp;
163<!-- ========== METHOD SUMMARY =========== -->
164
165<A NAME="method_summary"><!-- --></A>
166<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
167<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
168<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
169<B>Method Summary</B></FONT></TH>
170</TR>
171<TR BGCOLOR="white" CLASS="TableRowColor">
172<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
173<CODE>&nbsp;void</CODE></FONT></TD>
174<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#accept(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector, K)">accept</A></B>(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector&nbsp;jc,
175       <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>&nbsp;key)</CODE>
176
177<BR>
178&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If key provided matches that of this Composite, give JoinCollector
179 iterator over values it may emit.</TD>
180</TR>
181<TR BGCOLOR="white" CLASS="TableRowColor">
182<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
183<CODE>&nbsp;void</CODE></FONT></TD>
184<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#add(org.apache.hadoop.mapred.join.ComposableRecordReader)">add</A></B>(<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/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>,? extends <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">V</A>&gt;&nbsp;rr)</CODE>
185
186<BR>
187&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Add a RecordReader to this collection.</TD>
188</TR>
189<TR BGCOLOR="white" CLASS="TableRowColor">
190<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
191<CODE>&nbsp;void</CODE></FONT></TD>
192<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#close()">close</A></B>()</CODE>
193
194<BR>
195&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Close all child RRs.</TD>
196</TR>
197<TR BGCOLOR="white" CLASS="TableRowColor">
198<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
199<CODE>protected abstract &nbsp;boolean</CODE></FONT></TD>
200<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#combine(java.lang.Object[], org.apache.hadoop.mapred.join.TupleWritable)">combine</A></B>(<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>[]&nbsp;srcs,
201        <A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&nbsp;value)</CODE>
202
203<BR>
204&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
205</TR>
206<TR BGCOLOR="white" CLASS="TableRowColor">
207<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
208<CODE>&nbsp;int</CODE></FONT></TD>
209<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#compareTo(org.apache.hadoop.mapred.join.ComposableRecordReader)">compareTo</A></B>(<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/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>,?&gt;&nbsp;other)</CODE>
210
211<BR>
212&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Implement Comparable contract (compare key of join or head of heap
213 with that of another).</TD>
214</TR>
215<TR BGCOLOR="white" CLASS="TableRowColor">
216<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
217<CODE>protected &nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A></CODE></FONT></TD>
218<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#createInternalValue()">createInternalValue</A></B>()</CODE>
219
220<BR>
221&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create a value to be used internally for joins.</TD>
222</TR>
223<TR BGCOLOR="white" CLASS="TableRowColor">
224<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
225<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A></CODE></FONT></TD>
226<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#createKey()">createKey</A></B>()</CODE>
227
228<BR>
229&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create a new key value common to all child RRs.</TD>
230</TR>
231<TR BGCOLOR="white" CLASS="TableRowColor">
232<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
233<CODE>protected &nbsp;void</CODE></FONT></TD>
234<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#fillJoinCollector(K)">fillJoinCollector</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>&nbsp;iterkey)</CODE>
235
236<BR>
237&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For all child RRs offering the key provided, obtain an iterator
238 at that position in the JoinCollector.</TD>
239</TR>
240<TR BGCOLOR="white" CLASS="TableRowColor">
241<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
242<CODE>protected &nbsp;<A HREF="../../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A></CODE></FONT></TD>
243<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getComparator()">getComparator</A></B>()</CODE>
244
245<BR>
246&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return comparator defining the ordering for RecordReaders in this
247 composite.</TD>
248</TR>
249<TR BGCOLOR="white" CLASS="TableRowColor">
250<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
251<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A></CODE></FONT></TD>
252<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getConf()">getConf</A></B>()</CODE>
253
254<BR>
255&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the configuration used by this object.</TD>
256</TR>
257<TR BGCOLOR="white" CLASS="TableRowColor">
258<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
259<CODE>protected abstract &nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapred.join">ResetableIterator</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">X</A>&gt;</CODE></FONT></TD>
260<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getDelegate()">getDelegate</A></B>()</CODE>
261
262<BR>
263&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Obtain an iterator over the child RRs apropos of the value type
264 ultimately emitted from this join.</TD>
265</TR>
266<TR BGCOLOR="white" CLASS="TableRowColor">
267<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
268<CODE>&nbsp;long</CODE></FONT></TD>
269<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getPos()">getPos</A></B>()</CODE>
270
271<BR>
272&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unsupported (returns zero in all cases).</TD>
273</TR>
274<TR BGCOLOR="white" CLASS="TableRowColor">
275<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
276<CODE>&nbsp;float</CODE></FONT></TD>
277<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getProgress()">getProgress</A></B>()</CODE>
278
279<BR>
280&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Report progress as the minimum of all child RR progress.</TD>
281</TR>
282<TR BGCOLOR="white" CLASS="TableRowColor">
283<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
284<CODE>protected &nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/PriorityQueue.html?is-external=true" title="class or interface in java.util">PriorityQueue</A>&lt;<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/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>,?&gt;&gt;</CODE></FONT></TD>
285<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getRecordReaderQueue()">getRecordReaderQueue</A></B>()</CODE>
286
287<BR>
288&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return sorted list of RecordReaders for this composite.</TD>
289</TR>
290<TR BGCOLOR="white" CLASS="TableRowColor">
291<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
292<CODE>&nbsp;boolean</CODE></FONT></TD>
293<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#hasNext()">hasNext</A></B>()</CODE>
294
295<BR>
296&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return true if it is possible that this could emit more values.</TD>
297</TR>
298<TR BGCOLOR="white" CLASS="TableRowColor">
299<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
300<CODE>&nbsp;int</CODE></FONT></TD>
301<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#id()">id</A></B>()</CODE>
302
303<BR>
304&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the position in the collector this class occupies.</TD>
305</TR>
306<TR BGCOLOR="white" CLASS="TableRowColor">
307<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
308<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A></CODE></FONT></TD>
309<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#key()">key</A></B>()</CODE>
310
311<BR>
312&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the key for the current join or the value at the top of the
313 RecordReader heap.</TD>
314</TR>
315<TR BGCOLOR="white" CLASS="TableRowColor">
316<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
317<CODE>&nbsp;void</CODE></FONT></TD>
318<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#key(K)">key</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>&nbsp;key)</CODE>
319
320<BR>
321&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Clone the key at the top of this RR into the given object.</TD>
322</TR>
323<TR BGCOLOR="white" CLASS="TableRowColor">
324<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
325<CODE>&nbsp;void</CODE></FONT></TD>
326<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></B>(<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
327
328<BR>
329&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the configuration to be used by this object.</TD>
330</TR>
331<TR BGCOLOR="white" CLASS="TableRowColor">
332<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
333<CODE>&nbsp;void</CODE></FONT></TD>
334<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#skip(K)">skip</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>&nbsp;key)</CODE>
335
336<BR>
337&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pass skip key to child RRs.</TD>
338</TR>
339</TABLE>
340&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
341<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
342<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
343<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>
344</TR>
345<TR BGCOLOR="white" CLASS="TableRowColor">
346<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>
347</TR>
348</TABLE>
349&nbsp;
350<P>
351
352<!-- ============ FIELD DETAIL =========== -->
353
354<A NAME="field_detail"><!-- --></A>
355<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
356<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
357<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
358<B>Field Detail</B></FONT></TH>
359</TR>
360</TABLE>
361
362<A NAME="jc"><!-- --></A><H3>
363jc</H3>
364<PRE>
365protected final org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector <B>jc</B></PRE>
366<DL>
367<DL>
368</DL>
369</DL>
370<HR>
371
372<A NAME="kids"><!-- --></A><H3>
373kids</H3>
374<PRE>
375protected final <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/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A> extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,? extends <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">V</A> extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;[] <B>kids</B></PRE>
376<DL>
377<DL>
378</DL>
379</DL>
380
381<!-- ========= CONSTRUCTOR DETAIL ======== -->
382
383<A NAME="constructor_detail"><!-- --></A>
384<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
385<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
386<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
387<B>Constructor Detail</B></FONT></TH>
388</TR>
389</TABLE>
390
391<A NAME="CompositeRecordReader(int, int, java.lang.Class)"><!-- --></A><H3>
392CompositeRecordReader</H3>
393<PRE>
394public <B>CompositeRecordReader</B>(int&nbsp;id,
395                             int&nbsp;capacity,
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>&lt;? extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&gt;&nbsp;cmpcl)
397                      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>
398<DL>
399<DD>Create a RecordReader with <tt>capacity</tt> children to position
400 <tt>id</tt> in the parent reader.
401 The id of a root CompositeRecordReader is -1 by convention, but relying
402 on this is not recommended.
403<P>
404<DL>
405
406<DT><B>Throws:</B>
407<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>
408</DL>
409
410<!-- ============ METHOD DETAIL ========== -->
411
412<A NAME="method_detail"><!-- --></A>
413<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
414<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
415<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
416<B>Method Detail</B></FONT></TH>
417</TR>
418</TABLE>
419
420<A NAME="combine(java.lang.Object[], org.apache.hadoop.mapred.join.TupleWritable)"><!-- --></A><H3>
421combine</H3>
422<PRE>
423protected abstract boolean <B>combine</B>(<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>[]&nbsp;srcs,
424                                   <A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&nbsp;value)</PRE>
425<DL>
426<DD><DL>
427</DL>
428</DD>
429<DD><DL>
430</DL>
431</DD>
432</DL>
433<HR>
434
435<A NAME="id()"><!-- --></A><H3>
436id</H3>
437<PRE>
438public int <B>id</B>()</PRE>
439<DL>
440<DD>Return the position in the collector this class occupies.
441<P>
442<DD><DL>
443</DL>
444</DD>
445<DD><DL>
446</DL>
447</DD>
448</DL>
449<HR>
450
451<A NAME="setConf(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
452setConf</H3>
453<PRE>
454public void <B>setConf</B>(<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
455<DL>
456<DD>Set the configuration to be used by this object.
457<P>
458<DD><DL>
459<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></CODE></DL>
460</DD>
461<DD><DL>
462</DL>
463</DD>
464</DL>
465<HR>
466
467<A NAME="getConf()"><!-- --></A><H3>
468getConf</H3>
469<PRE>
470public <A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A> <B>getConf</B>()</PRE>
471<DL>
472<DD>Return the configuration used by this object.
473<P>
474<DD><DL>
475<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html#getConf()">getConf</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></CODE></DL>
476</DD>
477<DD><DL>
478</DL>
479</DD>
480</DL>
481<HR>
482
483<A NAME="getRecordReaderQueue()"><!-- --></A><H3>
484getRecordReaderQueue</H3>
485<PRE>
486protected <A HREF="http://java.sun.com/javase/6/docs/api/java/util/PriorityQueue.html?is-external=true" title="class or interface in java.util">PriorityQueue</A>&lt;<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/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>,?&gt;&gt; <B>getRecordReaderQueue</B>()</PRE>
487<DL>
488<DD>Return sorted list of RecordReaders for this composite.
489<P>
490<DD><DL>
491</DL>
492</DD>
493<DD><DL>
494</DL>
495</DD>
496</DL>
497<HR>
498
499<A NAME="getComparator()"><!-- --></A><H3>
500getComparator</H3>
501<PRE>
502protected <A HREF="../../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A> <B>getComparator</B>()</PRE>
503<DL>
504<DD>Return comparator defining the ordering for RecordReaders in this
505 composite.
506<P>
507<DD><DL>
508</DL>
509</DD>
510<DD><DL>
511</DL>
512</DD>
513</DL>
514<HR>
515
516<A NAME="add(org.apache.hadoop.mapred.join.ComposableRecordReader)"><!-- --></A><H3>
517add</H3>
518<PRE>
519public void <B>add</B>(<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/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>,? extends <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">V</A>&gt;&nbsp;rr)
520         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>
521<DL>
522<DD>Add a RecordReader to this collection.
523 The id() of a RecordReader determines where in the Tuple its
524 entry will appear. Adding RecordReaders with the same id has
525 undefined behavior.
526<P>
527<DD><DL>
528</DL>
529</DD>
530<DD><DL>
531
532<DT><B>Throws:</B>
533<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>
534</DD>
535</DL>
536<HR>
537
538<A NAME="key()"><!-- --></A><H3>
539key</H3>
540<PRE>
541public <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A> <B>key</B>()</PRE>
542<DL>
543<DD>Return the key for the current join or the value at the top of the
544 RecordReader heap.
545<P>
546<DD><DL>
547</DL>
548</DD>
549<DD><DL>
550</DL>
551</DD>
552</DL>
553<HR>
554
555<A NAME="key(org.apache.hadoop.io.WritableComparable)"><!-- --></A><A NAME="key(K)"><!-- --></A><H3>
556key</H3>
557<PRE>
558public void <B>key</B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>&nbsp;key)
559         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>
560<DL>
561<DD>Clone the key at the top of this RR into the given object.
562<P>
563<DD><DL>
564</DL>
565</DD>
566<DD><DL>
567
568<DT><B>Throws:</B>
569<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>
570</DD>
571</DL>
572<HR>
573
574<A NAME="hasNext()"><!-- --></A><H3>
575hasNext</H3>
576<PRE>
577public boolean <B>hasNext</B>()</PRE>
578<DL>
579<DD>Return true if it is possible that this could emit more values.
580<P>
581<DD><DL>
582</DL>
583</DD>
584<DD><DL>
585</DL>
586</DD>
587</DL>
588<HR>
589
590<A NAME="skip(org.apache.hadoop.io.WritableComparable)"><!-- --></A><A NAME="skip(K)"><!-- --></A><H3>
591skip</H3>
592<PRE>
593public void <B>skip</B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>&nbsp;key)
594          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>
595<DL>
596<DD>Pass skip key to child RRs.
597<P>
598<DD><DL>
599</DL>
600</DD>
601<DD><DL>
602
603<DT><B>Throws:</B>
604<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>
605</DD>
606</DL>
607<HR>
608
609<A NAME="getDelegate()"><!-- --></A><H3>
610getDelegate</H3>
611<PRE>
612protected abstract <A HREF="../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapred.join">ResetableIterator</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">X</A>&gt; <B>getDelegate</B>()</PRE>
613<DL>
614<DD>Obtain an iterator over the child RRs apropos of the value type
615 ultimately emitted from this join.
616<P>
617<DD><DL>
618</DL>
619</DD>
620<DD><DL>
621</DL>
622</DD>
623</DL>
624<HR>
625
626<A NAME="accept(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector,org.apache.hadoop.io.WritableComparable)"><!-- --></A><A NAME="accept(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector, K)"><!-- --></A><H3>
627accept</H3>
628<PRE>
629public void <B>accept</B>(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector&nbsp;jc,
630                   <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>&nbsp;key)
631            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>
632<DL>
633<DD>If key provided matches that of this Composite, give JoinCollector
634 iterator over values it may emit.
635<P>
636<DD><DL>
637</DL>
638</DD>
639<DD><DL>
640
641<DT><B>Throws:</B>
642<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>
643</DD>
644</DL>
645<HR>
646
647<A NAME="fillJoinCollector(org.apache.hadoop.io.WritableComparable)"><!-- --></A><A NAME="fillJoinCollector(K)"><!-- --></A><H3>
648fillJoinCollector</H3>
649<PRE>
650protected void <B>fillJoinCollector</B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>&nbsp;iterkey)
651                          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>
652<DL>
653<DD>For all child RRs offering the key provided, obtain an iterator
654 at that position in the JoinCollector.
655<P>
656<DD><DL>
657</DL>
658</DD>
659<DD><DL>
660
661<DT><B>Throws:</B>
662<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>
663</DD>
664</DL>
665<HR>
666
667<A NAME="compareTo(org.apache.hadoop.mapred.join.ComposableRecordReader)"><!-- --></A><H3>
668compareTo</H3>
669<PRE>
670public int <B>compareTo</B>(<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/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A>,?&gt;&nbsp;other)</PRE>
671<DL>
672<DD>Implement Comparable contract (compare key of join or head of heap
673 with that of another).
674<P>
675<DD><DL>
676</DL>
677</DD>
678<DD><DL>
679</DL>
680</DD>
681</DL>
682<HR>
683
684<A NAME="createKey()"><!-- --></A><H3>
685createKey</H3>
686<PRE>
687public <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">K</A> <B>createKey</B>()</PRE>
688<DL>
689<DD>Create a new key value common to all child RRs.
690<P>
691<DD><DL>
692</DL>
693</DD>
694<DD><DL>
695
696<DT><B>Throws:</B>
697<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/ClassCastException.html?is-external=true" title="class or interface in java.lang">ClassCastException</A></CODE> - if key classes differ.</DL>
698</DD>
699</DL>
700<HR>
701
702<A NAME="createInternalValue()"><!-- --></A><H3>
703createInternalValue</H3>
704<PRE>
705protected <A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A> <B>createInternalValue</B>()</PRE>
706<DL>
707<DD>Create a value to be used internally for joins.
708<P>
709<DD><DL>
710</DL>
711</DD>
712<DD><DL>
713</DL>
714</DD>
715</DL>
716<HR>
717
718<A NAME="getPos()"><!-- --></A><H3>
719getPos</H3>
720<PRE>
721public long <B>getPos</B>()
722            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>
723<DL>
724<DD>Unsupported (returns zero in all cases).
725<P>
726<DD><DL>
727</DL>
728</DD>
729<DD><DL>
730
731<DT><B>Throws:</B>
732<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>
733</DD>
734</DL>
735<HR>
736
737<A NAME="close()"><!-- --></A><H3>
738close</H3>
739<PRE>
740public void <B>close</B>()
741           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>
742<DL>
743<DD>Close all child RRs.
744<P>
745<DD><DL>
746</DL>
747</DD>
748<DD><DL>
749
750<DT><B>Throws:</B>
751<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>
752</DD>
753</DL>
754<HR>
755
756<A NAME="getProgress()"><!-- --></A><H3>
757getProgress</H3>
758<PRE>
759public float <B>getProgress</B>()
760                  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>
761<DL>
762<DD>Report progress as the minimum of all child RR progress.
763<P>
764<DD><DL>
765</DL>
766</DD>
767<DD><DL>
768
769<DT><B>Throws:</B>
770<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>
771</DD>
772</DL>
773<!-- ========= END OF CLASS DATA ========= -->
774<HR>
775
776
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778<A NAME="navbar_bottom"><!-- --></A>
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783<A NAME="navbar_bottom_firstrow"><!-- --></A>
784<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">
785  <TR ALIGN="center" VALIGN="top">
786  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
787  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>
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789  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/CompositeRecordReader.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
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