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OverrideRecordReader (Apache Hadoop Main 2.0.0-alpha API)
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org.apache.hadoop.mapreduce.lib.join</FONT>
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Class OverrideRecordReader&lt;K extends <A HREF="../../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&lt;?&gt;,V extends <A HREF="../../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
  <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="class in org.apache.hadoop.mapreduce">org.apache.hadoop.mapreduce.RecordReader</A>&lt;K,V&gt;
      <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/ComposableRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">org.apache.hadoop.mapreduce.lib.join.ComposableRecordReader</A>&lt;K,X&gt;
          <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">org.apache.hadoop.mapreduce.lib.join.CompositeRecordReader</A>&lt;K,V,V&gt;
              <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">org.apache.hadoop.mapreduce.lib.join.MultiFilterRecordReader</A>&lt;K,V&gt;
                  <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapreduce.lib.join.OverrideRecordReader&lt;K,V&gt;</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A>, <A HREF="http://download.oracle.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/mapreduce/lib/join/ComposableRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">ComposableRecordReader</A>&lt;K,?&gt;&gt;, <A HREF="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></DD>
</DL>
<HR>
<DL>
<DT><PRE><FONT SIZE="-1">@InterfaceAudience.Public
@InterfaceStability.Stable
</FONT>public class <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html#line.42"><B>OverrideRecordReader&lt;K extends <A HREF="../../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&lt;?&gt;,V extends <A HREF="../../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;</B></A><DT>extends <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">MultiFilterRecordReader</A>&lt;K,V&gt;</DL>
</PRE>

<P>
Prefer the &quot;rightmost&quot; data source for this key.
 For example, <tt>override(S1,S2,S3)</tt> will prefer values
 from S3 over S2, and values from S2 over S1 for all keys
 emitted from all sources.
<P>

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&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.mapreduce.lib.join.CompositeRecordReader"><!-- --></A>
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<TH ALIGN="left"><B>Fields inherited from class org.apache.hadoop.mapreduce.lib.join.<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">CompositeRecordReader</A></B></TH>
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<TD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#conf">conf</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#jc">jc</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#key">key</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#keyclass">keyclass</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#kids">kids</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#value">value</A></CODE></TD>
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<CODE>&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html#createValue()">createValue</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create instance of value.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html#emit(org.apache.hadoop.mapreduce.lib.join.TupleWritable)">emit</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/TupleWritable.html" title="class in org.apache.hadoop.mapreduce.lib.join">TupleWritable</A>&nbsp;dst)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Emit the value with the highest position in the tuple.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html#fillJoinCollector(K)">fillJoinCollector</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">K</A>&nbsp;iterkey)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Instead of filling the JoinCollector with iterators from all
 data sources, fill only the rightmost for this key.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapreduce.lib.join.MultiFilterRecordReader"><!-- --></A>
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.mapreduce.lib.join.<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">MultiFilterRecordReader</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#combine(java.lang.Object[], org.apache.hadoop.mapreduce.lib.join.TupleWritable)">combine</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#getDelegate()">getDelegate</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#initialize(org.apache.hadoop.mapreduce.InputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext)">initialize</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#nextKeyValue()">nextKeyValue</A></CODE></TD>
</TR>
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&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapreduce.lib.join.CompositeRecordReader"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.mapreduce.lib.join.<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">CompositeRecordReader</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#accept(org.apache.hadoop.mapreduce.lib.join.CompositeRecordReader.JoinCollector, K)">accept</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#add(org.apache.hadoop.mapreduce.lib.join.ComposableRecordReader)">add</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#close()">close</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#compareTo(org.apache.hadoop.mapreduce.lib.join.ComposableRecordReader)">compareTo</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#createKey()">createKey</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#createTupleWritable()">createTupleWritable</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#getComparator()">getComparator</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#getConf()">getConf</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#getCurrentKey()">getCurrentKey</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#getCurrentValue()">getCurrentValue</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#getProgress()">getProgress</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#getRecordReaderQueue()">getRecordReaderQueue</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#hasNext()">hasNext</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#id()">id</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#key()">key</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#key(K)">key</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A>, <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#skip(K)">skip</A></CODE></TD>
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<A NAME="emit(org.apache.hadoop.mapreduce.lib.join.TupleWritable)"><!-- --></A><H3>
emit</H3>
<PRE>
protected <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html#line.56"><B>emit</B></A>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/TupleWritable.html" title="class in org.apache.hadoop.mapreduce.lib.join">TupleWritable</A>&nbsp;dst)</PRE>
<DL>
<DD>Emit the value with the highest position in the tuple.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#emit(org.apache.hadoop.mapreduce.lib.join.TupleWritable)">emit</A></CODE> in class <CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">MultiFilterRecordReader</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/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>&lt;?&gt;,<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/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>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="createValue()"><!-- --></A><H3>
createValue</H3>
<PRE>
public <A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html#line.61"><B>createValue</B></A>()</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/ComposableRecordReader.html#createValue()">ComposableRecordReader</A></CODE></B></DD>
<DD>Create instance of value.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="fillJoinCollector(org.apache.hadoop.io.WritableComparable)"><!-- --></A><A NAME="fillJoinCollector(K)"><!-- --></A><H3>
fillJoinCollector</H3>
<PRE>
protected void <A HREF="../../../../../../src-html/org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html#line.84"><B>fillJoinCollector</B></A>(<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">K</A>&nbsp;iterkey)
                          throws <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A>,
                                 <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></PRE>
<DL>
<DD>Instead of filling the JoinCollector with iterators from all
 data sources, fill only the rightmost for this key.
 This not only saves space by discarding the other sources, but
 it also emits the number of key-value pairs in the preferred
 RecordReader instead of repeating that stream n times, where
 n is the cardinality of the cross product of the discarded
 streams for the given key.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#fillJoinCollector(K)">fillJoinCollector</A></CODE> in class <CODE><A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">CompositeRecordReader</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/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>&lt;?&gt;,<A HREF="../../../../../../org/apache/hadoop/mapreduce/lib/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/mapreduce/lib/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>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE></DL>
</DD>
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