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apache / hadoop-site / 952d547359cafef280f0a0324055741b2ed55be1 / . / content / docs / r3.3.1 / api / org / apache / hadoop / mapreduce / lib / join / MultiFilterRecordReader.html
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<div class="subTitle">org.apache.hadoop.mapreduce.lib.join</div>
<h2 title="Class MultiFilterRecordReader" class="title">Class MultiFilterRecordReader&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>
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<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><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;</li>
<li>
<ul class="inheritance">
<li><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;</li>
<li>
<ul class="inheritance">
<li><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;</li>
<li>
<ul class="inheritance">
<li>org.apache.hadoop.mapreduce.lib.join.MultiFilterRecordReader&lt;K,V&gt;</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a>, <a href="https://docs.oracle.com/javase/8/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>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/OverrideRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">OverrideRecordReader</a></dd>
</dl>
<hr>
<br>
<pre>@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract class <span class="typeNameLabel">MultiFilterRecordReader&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;</span>
extends <a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">CompositeRecordReader</a>&lt;K,V,V&gt;</pre>
<div class="block">Base class for Composite join returning values derived from multiple
sources, but generally not tuples.</div>
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<h3>Fields inherited from class&nbsp;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></h3>
<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></li>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#MultiFilterRecordReader-int-org.apache.hadoop.conf.Configuration-int-java.lang.Class-">MultiFilterRecordReader</a></span>(int&nbsp;id,
<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf,
int&nbsp;capacity,
<a href="https://docs.oracle.com/javase/8/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>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#combine-java.lang.Object:A-org.apache.hadoop.mapreduce.lib.join.TupleWritable-">combine</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>[]&nbsp;srcs,
<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/TupleWritable.html" title="class in org.apache.hadoop.mapreduce.lib.join">TupleWritable</a>&nbsp;dst)</code>
<div class="block">Default implementation offers <a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#emit-org.apache.hadoop.mapreduce.lib.join.TupleWritable-"><code>emit(org.apache.hadoop.mapreduce.lib.join.TupleWritable)</code></a> every Tuple from the
collector (the outer join of child RRs).</div>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected abstract <a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">V</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#emit-org.apache.hadoop.mapreduce.lib.join.TupleWritable-">emit</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/TupleWritable.html" title="class in org.apache.hadoop.mapreduce.lib.join">TupleWritable</a>&nbsp;dst)</code>
<div class="block">For each tuple emitted, return a value (typically one of the values
in the tuple).</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>protected <a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapreduce.lib.join">ResetableIterator</a>&lt;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">V</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#getDelegate--">getDelegate</a></span>()</code>
<div class="block">Return an iterator returning a single value from the tuple.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#initialize-org.apache.hadoop.mapreduce.InputSplit-org.apache.hadoop.mapreduce.TaskAttemptContext-">initialize</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce">InputSplit</a>&nbsp;split,
<a href="../../../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="interface in org.apache.hadoop.mapreduce">TaskAttemptContext</a>&nbsp;context)</code>
<div class="block">Called once at initialization.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#nextKeyValue--">nextKeyValue</a></span>()</code>
<div class="block">Read the next key, value pair.</div>
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<h3>Methods inherited from class&nbsp;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></h3>
<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#fillJoinCollector-K-">fillJoinCollector</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></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h3>Constructor Detail</h3>
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<h4>MultiFilterRecordReader</h4>
<pre>public&nbsp;MultiFilterRecordReader(int&nbsp;id,
<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf,
int&nbsp;capacity,
<a href="https://docs.oracle.com/javase/8/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)
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>
<dl>
<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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<h4>emit</h4>
<pre>protected abstract&nbsp;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">V</a>&nbsp;emit(<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/TupleWritable.html" title="class in org.apache.hadoop.mapreduce.lib.join">TupleWritable</a>&nbsp;dst)
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">For each tuple emitted, return a value (typically one of the values
in the tuple).
Modifying the Writables in the tuple is permitted and unlikely to affect
join behavior in most cases, but it is not recommended. It's safer to
clone first.</div>
<dl>
<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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<h4>combine</h4>
<pre>protected&nbsp;boolean&nbsp;combine(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>[]&nbsp;srcs,
<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/TupleWritable.html" title="class in org.apache.hadoop.mapreduce.lib.join">TupleWritable</a>&nbsp;dst)</pre>
<div class="block">Default implementation offers <a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html#emit-org.apache.hadoop.mapreduce.lib.join.TupleWritable-"><code>emit(org.apache.hadoop.mapreduce.lib.join.TupleWritable)</code></a> every Tuple from the
collector (the outer join of child RRs).</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#combine-java.lang.Object:A-org.apache.hadoop.mapreduce.lib.join.TupleWritable-">combine</a></code>&nbsp;in class&nbsp;<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/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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>nextKeyValue</h4>
<pre>public&nbsp;boolean&nbsp;nextKeyValue()
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>,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre>
<div class="block">Read the next key, value pair.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/RecordReader.html#nextKeyValue--">nextKeyValue</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/hadoop/mapreduce/RecordReader.html" title="class in org.apache.hadoop.mapreduce">RecordReader</a>&lt;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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="returnLabel">Returns:</span></dt>
<dd>true if a key/value pair was read</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>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code></dd>
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<a name="initialize-org.apache.hadoop.mapreduce.InputSplit-org.apache.hadoop.mapreduce.TaskAttemptContext-">
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<h4>initialize</h4>
<pre>public&nbsp;void&nbsp;initialize(<a href="../../../../../../org/apache/hadoop/mapreduce/InputSplit.html" title="class in org.apache.hadoop.mapreduce">InputSplit</a>&nbsp;split,
<a href="../../../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="interface in org.apache.hadoop.mapreduce">TaskAttemptContext</a>&nbsp;context)
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>,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/hadoop/mapreduce/RecordReader.html#initialize-org.apache.hadoop.mapreduce.InputSplit-org.apache.hadoop.mapreduce.TaskAttemptContext-">RecordReader</a></code></span></div>
<div class="block">Called once at initialization.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#initialize-org.apache.hadoop.mapreduce.InputSplit-org.apache.hadoop.mapreduce.TaskAttemptContext-">initialize</a></code>&nbsp;in class&nbsp;<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/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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="paramLabel">Parameters:</span></dt>
<dd><code>split</code> - the split that defines the range of records to read</dd>
<dd><code>context</code> - the information about the task</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>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code></dd>
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<h4>getDelegate</h4>
<pre>protected&nbsp;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapreduce.lib.join">ResetableIterator</a>&lt;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">V</a>&gt;&nbsp;getDelegate()</pre>
<div class="block">Return an iterator returning a single value from the tuple.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/CompositeRecordReader.html#getDelegate--">getDelegate</a></code>&nbsp;in class&nbsp;<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/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">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="seeLabel">See Also:</span></dt>
<dd><code>MultiFilterRecordReader.MultiFilterDelegationIterator</code></dd>
</dl>
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