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<div class="subTitle">org.apache.hadoop.mapreduce.lib.join</div>
<h2 title="Class WrappedRecordReader" class="title">Class WrappedRecordReader&lt;K extends <a href="../../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>&lt;?&gt;,U 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>
<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,U&gt;</li>
<li>
<ul class="inheritance">
<li>org.apache.hadoop.mapreduce.lib.join.WrappedRecordReader&lt;K,U&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;</dd>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Stable
public class <span class="typeNameLabel">WrappedRecordReader&lt;K extends <a href="../../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>&lt;?&gt;,U 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/ComposableRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">ComposableRecordReader</a>&lt;K,U&gt;</pre>
<div class="block">Proxy class for a RecordReader participating in the join framework.
This class keeps track of the &quot;head&quot; key-value pair for the
provided RecordReader and keeps a store of values matching a key when
this source is participating in a join.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#cmp">cmp</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#empty">empty</a></span></code>&nbsp;</td>
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<th class="colFirst" scope="col">Modifier</th>
<th class="colLast" scope="col">Constructor and Description</th>
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<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#WrappedRecordReader-int-">WrappedRecordReader</a></span>(int&nbsp;id)</code>&nbsp;</td>
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<h3>Method Summary</h3>
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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="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#accept-org.apache.hadoop.mapreduce.lib.join.CompositeRecordReader.JoinCollector-K-">accept</a></span>(org.apache.hadoop.mapreduce.lib.join.CompositeRecordReader.JoinCollector&nbsp;i,
<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>&nbsp;key)</code>
<div class="block">Add an iterator to the collector at the position occupied by this
RecordReader over the values in this stream paired with the key
provided (ie register a stream of values from this source matching K
with a collector).</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#close--">close</a></span>()</code>
<div class="block">Forward close request to proxied RR.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#compareTo-org.apache.hadoop.mapreduce.lib.join.ComposableRecordReader-">compareTo</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/ComposableRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">ComposableRecordReader</a>&lt;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>,?&gt;&nbsp;other)</code>
<div class="block">Implement Comparable contract (compare key at head of proxied RR
with that of another).</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#createKey--">createKey</a></span>()</code>
<div class="block">Request new key from proxied RR.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">U</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#createValue--">createValue</a></span>()</code>
<div class="block">Create instance of value.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#equals-java.lang.Object-">equals</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;other)</code>
<div class="block">Return true iff compareTo(other) retn true.</div>
</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#getCurrentKey--">getCurrentKey</a></span>()</code>
<div class="block">Get current key</div>
</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">U</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#getCurrentValue--">getCurrentValue</a></span>()</code>
<div class="block">Get current value</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>float</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#getProgress--">getProgress</a></span>()</code>
<div class="block">Request progress from proxied RR.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#hasNext--">hasNext</a></span>()</code>
<div class="block">Return true if the RR- including the k,v pair stored in this object-
is exhausted.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#id--">id</a></span>()</code>
<div class="block">Return the position in the collector this class occupies.</div>
</td>
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<tr id="i12" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.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>
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<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#key--">key</a></span>()</code>
<div class="block">Return the key at the head of this RR.</div>
</td>
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<tr id="i14" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#key-K-">key</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>&nbsp;qkey)</code>
<div class="block">Clone the key at the head of this RR into the object supplied.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#nextKeyValue--">nextKeyValue</a></span>()</code>
<div class="block">Read the next k,v pair into the head of this object; return true iff
the RR and this are exhausted.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html#skip-K-">skip</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>&nbsp;key)</code>
<div class="block">Skip key-value pairs with keys less than or equal to the key provided.</div>
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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#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#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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<pre>protected&nbsp;boolean empty</pre>
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<h4>cmp</h4>
<pre>protected&nbsp;<a href="../../../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</a> cmp</pre>
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<h4>WrappedRecordReader</h4>
<pre>protected&nbsp;WrappedRecordReader(int&nbsp;id)</pre>
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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">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/RecordReader.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/RecordReader.html" title="class in org.apache.hadoop.mapreduce">RecordReader</a>&lt;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">U</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>createKey</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>&nbsp;createKey()</pre>
<div class="block">Request new key from proxied RR.</div>
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<h4>createValue</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">U</a>&nbsp;createValue()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/ComposableRecordReader.html#createValue--">ComposableRecordReader</a></code></span></div>
<div class="block">Create instance of value.</div>
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<a name="id--">
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<h4>id</h4>
<pre>public&nbsp;int&nbsp;id()</pre>
<div class="block">Return the position in the collector this class occupies.</div>
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<h4>key</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>&nbsp;key()</pre>
<div class="block">Return the key at the head of this RR.</div>
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<h4>key</h4>
<pre>public&nbsp;void&nbsp;key(<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>&nbsp;qkey)
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">Clone the key at the head of this RR into the object supplied.</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>hasNext</h4>
<pre>public&nbsp;boolean&nbsp;hasNext()</pre>
<div class="block">Return true if the RR- including the k,v pair stored in this object-
is exhausted.</div>
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<a name="skip-org.apache.hadoop.io.WritableComparable-">
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<h4>skip</h4>
<pre>public&nbsp;void&nbsp;skip(<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>&nbsp;key)
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">Skip key-value pairs with keys less than or equal to the key provided.</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>
<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>
</dl>
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<a name="accept-org.apache.hadoop.mapreduce.lib.join.CompositeRecordReader.JoinCollector-org.apache.hadoop.io.WritableComparable-">
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<h4>accept</h4>
<pre>public&nbsp;void&nbsp;accept(org.apache.hadoop.mapreduce.lib.join.CompositeRecordReader.JoinCollector&nbsp;i,
<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>&nbsp;key)
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">Add an iterator to the collector at the position occupied by this
RecordReader over the values in this stream paired with the key
provided (ie register a stream of values from this source matching K
with a collector).</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>
<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>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 k,v pair into the head of this object; return true iff
the RR and this are exhausted.</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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">U</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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<h4>getCurrentKey</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>&nbsp;getCurrentKey()
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">Get current key</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/RecordReader.html#getCurrentKey--">getCurrentKey</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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">U</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>the current key or null if there is no current key</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>getCurrentValue</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">U</a>&nbsp;getCurrentValue()
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">Get current value</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/RecordReader.html#getCurrentValue--">getCurrentValue</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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">U</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>the object that 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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<h4>getProgress</h4>
<pre>public&nbsp;float&nbsp;getProgress()
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">Request progress from proxied RR.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/RecordReader.html#getProgress--">getProgress</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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">U</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>a number between 0.0 and 1.0 that is the fraction of the data 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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<h4>close</h4>
<pre>public&nbsp;void&nbsp;close()
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">Forward close request to proxied RR.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true#close--" title="class or interface in java.io">close</a></code>&nbsp;in interface&nbsp;<code><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></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code>&nbsp;in interface&nbsp;<code><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></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/RecordReader.html#close--">close</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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">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/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">U</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>
</dl>
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<h4>compareTo</h4>
<pre>public&nbsp;int&nbsp;compareTo(<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/ComposableRecordReader.html" title="class in org.apache.hadoop.mapreduce.lib.join">ComposableRecordReader</a>&lt;<a href="../../../../../../org/apache/hadoop/mapreduce/lib/join/WrappedRecordReader.html" title="type parameter in WrappedRecordReader">K</a>,?&gt;&nbsp;other)</pre>
<div class="block">Implement Comparable contract (compare key at head of proxied RR
with that of another).</div>
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<h4>equals</h4>
<pre>public&nbsp;boolean&nbsp;equals(<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;other)</pre>
<div class="block">Return true iff compareTo(other) retn true.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><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></code>&nbsp;in class&nbsp;<code><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></code></dd>
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<h4>hashCode</h4>
<pre>public&nbsp;int&nbsp;hashCode()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><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></code>&nbsp;in class&nbsp;<code><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></code></dd>
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