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<div class="subTitle">org.apache.hadoop.mapred.join</div>
<h2 title="Class OverrideRecordReader" class="title">Class 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>
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<li><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;</li>
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<li><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;</li>
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<li>org.apache.hadoop.mapred.join.OverrideRecordReader&lt;K,V&gt;</li>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Stable
public class <span class="typeNameLabel">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;</span>
extends <a href="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader</a>&lt;K,V&gt;</pre>
<div class="block">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.</div>
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<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></li>
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<td class="colFirst"><code>protected <a href="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html#emit-org.apache.hadoop.mapred.join.TupleWritable-">emit</a></span>(<a href="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</a>&nbsp;dst)</code>
<div class="block">Emit the value with the highest position in the tuple.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html#fillJoinCollector-K-">fillJoinCollector</a></span>(<a href="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">K</a>&nbsp;iterkey)</code>
<div class="block">Instead of filling the JoinCollector with iterators from all
data sources, fill only the rightmost for this key.</div>
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<code><a href="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html#combine-java.lang.Object:A-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></li>
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<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></li>
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<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></li>
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<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></li>
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<h4>emit</h4>
<pre>protected&nbsp;<a href="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">V</a>&nbsp;emit(<a href="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</a>&nbsp;dst)</pre>
<div class="block">Emit the value with the highest position in the tuple.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html#emit-org.apache.hadoop.mapred.join.TupleWritable-">emit</a></code>&nbsp;in class&nbsp;<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></dd>
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<h4>fillJoinCollector</h4>
<pre>protected&nbsp;void&nbsp;fillJoinCollector(<a href="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="type parameter in OverrideRecordReader">K</a>&nbsp;iterkey)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">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.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#fillJoinCollector-K-">fillJoinCollector</a></code>&nbsp;in class&nbsp;<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></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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