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<h2 title="Class MultithreadedTableMapper" class="title">Class MultithreadedTableMapper&lt;K2,V2&gt;</h2>
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<ul class="inheritance">
<li>org.apache.hadoop.mapreduce.Mapper&lt;<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>,KEYOUT,VALUEOUT&gt;</li>
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<li><a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableMapper.html" title="class in org.apache.hadoop.hbase.mapreduce">org.apache.hadoop.hbase.mapreduce.TableMapper</a>&lt;K2,V2&gt;</li>
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<li>org.apache.hadoop.hbase.mapreduce.MultithreadedTableMapper&lt;K2,V2&gt;</li>
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<pre>@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#line.61">MultithreadedTableMapper</a>&lt;K2,V2&gt;
extends <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableMapper.html" title="class in org.apache.hadoop.hbase.mapreduce">TableMapper</a>&lt;K2,V2&gt;</pre>
<div class="block">Multithreaded implementation for @link org.apache.hbase.mapreduce.TableMapper
<p>
It can be used instead when the Map operation is not CPU
bound in order to improve throughput.
<p>
Mapper implementations using this MapRunnable must be thread-safe.
<p>
The Map-Reduce job has to be configured with the mapper to use via
<a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#setMapperClass-org.apache.hadoop.mapreduce.Job-java.lang.Class-"><code>setMapperClass(org.apache.hadoop.mapreduce.Job, java.lang.Class&lt;? extends org.apache.hadoop.mapreduce.Mapper&lt;org.apache.hadoop.hbase.io.ImmutableBytesWritable, org.apache.hadoop.hbase.client.Result, K2, V2&gt;&gt;)</code></a> and the number of thread the thread-pool can use with the
<a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#getNumberOfThreads-org.apache.hadoop.mapreduce.JobContext-"><code>getNumberOfThreads(org.apache.hadoop.mapreduce.JobContext)</code></a> method. The default value is 10 threads.
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<td class="colFirst"><code>private class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.MapRunner.html" title="class in org.apache.hadoop.hbase.mapreduce">MultithreadedTableMapper.MapRunner</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.SubMapRecordReader.html" title="class in org.apache.hadoop.hbase.mapreduce">MultithreadedTableMapper.SubMapRecordReader</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private class&nbsp;</code></td>
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<td class="colFirst"><code>private class&nbsp;</code></td>
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<h3>Nested classes/interfaces inherited from class&nbsp;org.apache.hadoop.mapreduce.Mapper</h3>
<code>org.apache.hadoop.mapreduce.Mapper.Context</code></li>
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<td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html?is-external=true" title="class or interface in java.util.concurrent">ExecutorService</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#executor">executor</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#LOG">LOG</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private <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 org.apache.hadoop.mapreduce.Mapper&lt;<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>,<a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html" title="type parameter in MultithreadedTableMapper">K2</a>,<a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html" title="type parameter in MultithreadedTableMapper">V2</a>&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#mapClass">mapClass</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#MAPPER_CLASS">MAPPER_CLASS</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#NUMBER_OF_THREADS">NUMBER_OF_THREADS</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private org.apache.hadoop.mapreduce.Mapper.Context</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#outer">outer</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#MultithreadedTableMapper--">MultithreadedTableMapper</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>static &lt;K2,V2&gt;&nbsp;<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;org.apache.hadoop.mapreduce.Mapper&lt;<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>,K2,V2&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#getMapperClass-org.apache.hadoop.mapreduce.JobContext-">getMapperClass</a></span>(org.apache.hadoop.mapreduce.JobContext&nbsp;job)</code>
<div class="block">Get the application's mapper class.</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#getNumberOfThreads-org.apache.hadoop.mapreduce.JobContext-">getNumberOfThreads</a></span>(org.apache.hadoop.mapreduce.JobContext&nbsp;job)</code>
<div class="block">The number of threads in the thread pool that will run the map function.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#run-org.apache.hadoop.mapreduce.Mapper.Context-">run</a></span>(org.apache.hadoop.mapreduce.Mapper.Context&nbsp;context)</code>
<div class="block">Run the application's maps using a thread pool.</div>
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<td class="colFirst"><code>static &lt;K2,V2&gt;&nbsp;void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#setMapperClass-org.apache.hadoop.mapreduce.Job-java.lang.Class-">setMapperClass</a></span>(org.apache.hadoop.mapreduce.Job&nbsp;job,
<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 org.apache.hadoop.mapreduce.Mapper&lt;<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>,K2,V2&gt;&gt;&nbsp;cls)</code>
<div class="block">Set the application's mapper class.</div>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#setNumberOfThreads-org.apache.hadoop.mapreduce.Job-int-">setNumberOfThreads</a></span>(org.apache.hadoop.mapreduce.Job&nbsp;job,
int&nbsp;threads)</code>
<div class="block">Set the number of threads in the pool for running maps.</div>
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<h4>MultithreadedTableMapper</h4>
<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#line.61">MultithreadedTableMapper</a>()</pre>
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<pre>public static&nbsp;int&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#line.74">getNumberOfThreads</a>(org.apache.hadoop.mapreduce.JobContext&nbsp;job)</pre>
<div class="block">The number of threads in the thread pool that will run the map function.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>job</code> - the job</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of threads</dd>
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<h4>setNumberOfThreads</h4>
<pre>public static&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#line.84">setNumberOfThreads</a>(org.apache.hadoop.mapreduce.Job&nbsp;job,
int&nbsp;threads)</pre>
<div class="block">Set the number of threads in the pool for running maps.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>job</code> - the job to modify</dd>
<dd><code>threads</code> - the new number of threads</dd>
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<h4>getMapperClass</h4>
<pre>public static&nbsp;&lt;K2,V2&gt;&nbsp;<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;org.apache.hadoop.mapreduce.Mapper&lt;<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>,K2,V2&gt;&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#line.98">getMapperClass</a>(org.apache.hadoop.mapreduce.JobContext&nbsp;job)</pre>
<div class="block">Get the application's mapper class.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>K2</code> - the map's output key type</dd>
<dd><code>V2</code> - the map's output value type</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>job</code> - the job</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the mapper class to run</dd>
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<h4>setMapperClass</h4>
<pre>public static&nbsp;&lt;K2,V2&gt;&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#line.112">setMapperClass</a>(org.apache.hadoop.mapreduce.Job&nbsp;job,
<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 org.apache.hadoop.mapreduce.Mapper&lt;<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>,K2,V2&gt;&gt;&nbsp;cls)</pre>
<div class="block">Set the application's mapper class.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>K2</code> - the map output key type</dd>
<dd><code>V2</code> - the map output value type</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>job</code> - the job to modify</dd>
<dd><code>cls</code> - the class to use as the mapper</dd>
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<h4>run</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html#line.126">run</a>(org.apache.hadoop.mapreduce.Mapper.Context&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">Run the application's maps using a thread pool.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>run</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.mapreduce.Mapper&lt;<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>,<a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html" title="type parameter in MultithreadedTableMapper">K2</a>,<a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.html" title="type parameter in MultithreadedTableMapper">V2</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>
<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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