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7OverrideRecordReader (Hadoop 0.20.1 API)
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58&nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/join/OuterJoinRecordReader.html" title="class in org.apache.hadoop.mapred.join"><B>PREV CLASS</B></A>&nbsp;
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80<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
81DETAIL:&nbsp;FIELD&nbsp;|&nbsp;CONSTR&nbsp;|&nbsp;<A HREF="#method_detail">METHOD</A></FONT></TD>
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86
87<HR>
88<!-- ======== START OF CLASS DATA ======== -->
89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.mapred.join</FONT>
92<BR>
93Class OverrideRecordReader&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>&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 "><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="class in org.apache.hadoop.mapred.join">org.apache.hadoop.mapred.join.CompositeRecordReader</A>&lt;K,V,V&gt;
97      <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join">org.apache.hadoop.mapred.join.MultiFilterRecordReader</A>&lt;K,V&gt;
98          <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapred.join.OverrideRecordReader&lt;K,V&gt;</B>
99</PRE>
100<DL>
101<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="interface in org.apache.hadoop.mapred.join">ComposableRecordReader</A>&lt;K,?&gt;&gt;, <A HREF="../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="interface in org.apache.hadoop.mapred.join">ComposableRecordReader</A>&lt;K,V&gt;, <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A>&lt;K,V&gt;</DD>
102</DL>
103<HR>
104<DL>
105<DT><PRE>public class <B>OverrideRecordReader&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>&gt;</B><DT>extends <A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader</A>&lt;K,V&gt;</DL>
106</PRE>
107
108<P>
109Prefer the &quot;rightmost&quot; data source for this key.
110 For example, <tt>override(S1,S2,S3)</tt> will prefer values
111 from S3 over S2, and values from S2 over S1 for all keys
112 emitted from all sources.
113<P>
114
115<P>
116<HR>
117
118<P>
119<!-- ======== NESTED CLASS SUMMARY ======== -->
120
121<A NAME="nested_class_summary"><!-- --></A>
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124<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
125<B>Nested Class Summary</B></FONT></TH>
126</TR>
127</TABLE>
128&nbsp;<A NAME="nested_classes_inherited_from_class_org.apache.hadoop.mapred.join.MultiFilterRecordReader"><!-- --></A>
129<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
130<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
131<TH ALIGN="left"><B>Nested classes/interfaces inherited from class org.apache.hadoop.mapred.join.<A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader</A></B></TH>
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133<TR BGCOLOR="white" CLASS="TableRowColor">
134<TD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.MultiFilterDelegationIterator.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader.MultiFilterDelegationIterator</A></CODE></TD>
135</TR>
136</TABLE>
137&nbsp;
138<!-- =========== FIELD SUMMARY =========== -->
139
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143<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
144<B>Field Summary</B></FONT></TH>
145</TR>
146</TABLE>
147&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.mapred.join.CompositeRecordReader"><!-- --></A>
148<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
149<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
150<TH ALIGN="left"><B>Fields inherited from class org.apache.hadoop.mapred.join.<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="class in org.apache.hadoop.mapred.join">CompositeRecordReader</A></B></TH>
151</TR>
152<TR BGCOLOR="white" CLASS="TableRowColor">
153<TD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#jc">jc</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#kids">kids</A></CODE></TD>
154</TR>
155</TABLE>
156&nbsp;
157<!-- ========== METHOD SUMMARY =========== -->
158
159<A NAME="method_summary"><!-- --></A>
160<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
161<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
162<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
163<B>Method Summary</B></FONT></TH>
164</TR>
165<TR BGCOLOR="white" CLASS="TableRowColor">
166<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
167<CODE>protected &nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</A></CODE></FONT></TD>
168<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html#emit(org.apache.hadoop.mapred.join.TupleWritable)">emit</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&nbsp;dst)</CODE>
169
170<BR>
171&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Emit the value with the highest position in the tuple.</TD>
172</TR>
173<TR BGCOLOR="white" CLASS="TableRowColor">
174<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
175<CODE>protected &nbsp;void</CODE></FONT></TD>
176<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html#fillJoinCollector(K)">fillJoinCollector</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">K</A>&nbsp;iterkey)</CODE>
177
178<BR>
179&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Instead of filling the JoinCollector with iterators from all
180 data sources, fill only the rightmost for this key.</TD>
181</TR>
182</TABLE>
183&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapred.join.MultiFilterRecordReader"><!-- --></A>
184<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
185<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
186<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.mapred.join.<A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader</A></B></TH>
187</TR>
188<TR BGCOLOR="white" CLASS="TableRowColor">
189<TD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html#combine(java.lang.Object[], org.apache.hadoop.mapred.join.TupleWritable)">combine</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html#createValue()">createValue</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html#getDelegate()">getDelegate</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html#next(K, V)">next</A></CODE></TD>
190</TR>
191</TABLE>
192&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapred.join.CompositeRecordReader"><!-- --></A>
193<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
194<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
195<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.mapred.join.<A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="class in org.apache.hadoop.mapred.join">CompositeRecordReader</A></B></TH>
196</TR>
197<TR BGCOLOR="white" CLASS="TableRowColor">
198<TD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#accept(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector, K)">accept</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#add(org.apache.hadoop.mapred.join.ComposableRecordReader)">add</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#close()">close</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#compareTo(org.apache.hadoop.mapred.join.ComposableRecordReader)">compareTo</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#createInternalValue()">createInternalValue</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#createKey()">createKey</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getComparator()">getComparator</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getConf()">getConf</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getPos()">getPos</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getProgress()">getProgress</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getRecordReaderQueue()">getRecordReaderQueue</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#hasNext()">hasNext</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#id()">id</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#key()">key</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#key(K)">key</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#skip(K)">skip</A></CODE></TD>
199</TR>
200</TABLE>
201&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
202<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
203<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
204<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>
205</TR>
206<TR BGCOLOR="white" CLASS="TableRowColor">
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208</TR>
209</TABLE>
210&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapred.join.ComposableRecordReader"><!-- --></A>
211<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
212<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
213<TH ALIGN="left"><B>Methods inherited from interface org.apache.hadoop.mapred.join.<A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="interface in org.apache.hadoop.mapred.join">ComposableRecordReader</A></B></TH>
214</TR>
215<TR BGCOLOR="white" CLASS="TableRowColor">
216<TD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#accept(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector, K)">accept</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#hasNext()">hasNext</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#id()">id</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#key()">key</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#key(K)">key</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#skip(K)">skip</A></CODE></TD>
217</TR>
218</TABLE>
219&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapred.RecordReader"><!-- --></A>
220<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
221<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
222<TH ALIGN="left"><B>Methods inherited from interface org.apache.hadoop.mapred.<A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A></B></TH>
223</TR>
224<TR BGCOLOR="white" CLASS="TableRowColor">
225<TD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html#close()">close</A>, <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html#createKey()">createKey</A>, <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html#getPos()">getPos</A>, <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html#getProgress()">getProgress</A></CODE></TD>
226</TR>
227</TABLE>
228&nbsp;<A NAME="methods_inherited_from_class_java.lang.Comparable"><!-- --></A>
229<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
230<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
231<TH ALIGN="left"><B>Methods inherited from interface java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A></B></TH>
232</TR>
233<TR BGCOLOR="white" CLASS="TableRowColor">
234<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true#compareTo(T)" title="class or interface in java.lang">compareTo</A></CODE></TD>
235</TR>
236</TABLE>
237&nbsp;
238<P>
239
240<!-- ============ METHOD DETAIL ========== -->
241
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245<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
246<B>Method Detail</B></FONT></TH>
247</TR>
248</TABLE>
249
250<A NAME="emit(org.apache.hadoop.mapred.join.TupleWritable)"><!-- --></A><H3>
251emit</H3>
252<PRE>
253protected <A HREF="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</A> <B>emit</B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&nbsp;dst)</PRE>
254<DL>
255<DD>Emit the value with the highest position in the tuple.
256<P>
257<DD><DL>
258<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html#emit(org.apache.hadoop.mapred.join.TupleWritable)">emit</A></CODE> in class <CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">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/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</A> extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;</CODE></DL>
259</DD>
260<DD><DL>
261</DL>
262</DD>
263</DL>
264<HR>
265
266<A NAME="fillJoinCollector(org.apache.hadoop.io.WritableComparable)"><!-- --></A><A NAME="fillJoinCollector(K)"><!-- --></A><H3>
267fillJoinCollector</H3>
268<PRE>
269protected void <B>fillJoinCollector</B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">K</A>&nbsp;iterkey)
270                          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>
271<DL>
272<DD>Instead of filling the JoinCollector with iterators from all
273 data sources, fill only the rightmost for this key.
274 This not only saves space by discarding the other sources, but
275 it also emits the number of key-value pairs in the preferred
276 RecordReader instead of repeating that stream n times, where
277 n is the cardinality of the cross product of the discarded
278 streams for the given key.
279<P>
280<DD><DL>
281<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#fillJoinCollector(K)">fillJoinCollector</A></CODE> in class <CODE><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="class in org.apache.hadoop.mapred.join">CompositeRecordReader</A>&lt;<A HREF="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">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/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</A> extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>,<A HREF="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</A> extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;</CODE></DL>
282</DD>
283<DD><DL>
284
285<DT><B>Throws:</B>
286<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>
287</DD>
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