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| <div class="subTitle">org.apache.hadoop.mapreduce.lib.map</div> |
| <h2 title="Class MultithreadedMapper" class="title">Class MultithreadedMapper<K1,V1,K2,V2></h2> |
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| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">org.apache.hadoop.mapreduce.Mapper</a><K1,V1,K2,V2></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper<K1,V1,K2,V2></li> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">MultithreadedMapper<K1,V1,K2,V2></span> |
| extends <a href="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</a><K1,V1,K2,V2></pre> |
| <div class="block">Multithreaded implementation for @link org.apache.hadoop.mapreduce.Mapper. |
| <p> |
| It can be used instead of the default implementation, |
| <a href="../../../../../../org/apache/hadoop/mapred/MapRunner.html" title="class in org.apache.hadoop.mapred"><code>MapRunner</code></a>, 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/mapreduce/lib/map/MultithreadedMapper.html#setMapperClass-org.apache.hadoop.mapreduce.Job-java.lang.Class-"><code>setMapperClass(Job, Class)</code></a> and |
| the number of thread the thread-pool can use with the |
| <a href="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#getNumberOfThreads-org.apache.hadoop.mapreduce.JobContext-"><code>getNumberOfThreads(JobContext)</code></a> method. The default |
| value is 10 threads. |
| <p></div> |
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| <tr class="altColor"> |
| <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/mapreduce/lib/map/MultithreadedMapper.html#MAP_CLASS">MAP_CLASS</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <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/mapreduce/lib/map/MultithreadedMapper.html#NUM_THREADS">NUM_THREADS</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#MultithreadedMapper--">MultithreadedMapper</a></span>()</code> </td> |
| </tr> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <K1,V1,K2,V2><br><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><<a href="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</a><K1,V1,K2,V2>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#getMapperClass-org.apache.hadoop.mapreduce.JobContext-">getMapperClass</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</a> job)</code> |
| <div class="block">Get the application's mapper class.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#getNumberOfThreads-org.apache.hadoop.mapreduce.JobContext-">getNumberOfThreads</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</a> job)</code> |
| <div class="block">The number of threads in the thread pool that will run the map function.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#run-org.apache.hadoop.mapreduce.Mapper.Context-">run</a></span>(org.apache.hadoop.mapreduce.Mapper.Context context)</code> |
| <div class="block">Run the application's maps using a thread pool.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <K1,V1,K2,V2><br>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#setMapperClass-org.apache.hadoop.mapreduce.Job-java.lang.Class-">setMapperClass</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</a> 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><? extends <a href="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</a><K1,V1,K2,V2>> cls)</code> |
| <div class="block">Set the application's mapper class.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/map/MultithreadedMapper.html#setNumberOfThreads-org.apache.hadoop.mapreduce.Job-int-">setNumberOfThreads</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</a> job, |
| int threads)</code> |
| <div class="block">Set the number of threads in the pool for running maps.</div> |
| </td> |
| </tr> |
| </table> |
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| </a> |
| <h3>Methods inherited from class org.apache.hadoop.mapreduce.<a href="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</a></h3> |
| <code><a href="../../../../../../org/apache/hadoop/mapreduce/Mapper.html#cleanup-org.apache.hadoop.mapreduce.Mapper.Context-">cleanup</a>, <a href="../../../../../../org/apache/hadoop/mapreduce/Mapper.html#map-KEYIN-VALUEIN-org.apache.hadoop.mapreduce.Mapper.Context-">map</a>, <a href="../../../../../../org/apache/hadoop/mapreduce/Mapper.html#setup-org.apache.hadoop.mapreduce.Mapper.Context-">setup</a></code></li> |
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| <h3>Methods inherited from class 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>Field Detail</h3> |
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| <h4>NUM_THREADS</h4> |
| <pre>public 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> NUM_THREADS</pre> |
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| <h4>MAP_CLASS</h4> |
| <pre>public 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> MAP_CLASS</pre> |
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| <h3>Constructor Detail</h3> |
| <a name="MultithreadedMapper--"> |
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| <ul class="blockListLast"> |
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| <h4>MultithreadedMapper</h4> |
| <pre>public MultithreadedMapper()</pre> |
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| <h4>getNumberOfThreads</h4> |
| <pre>public static int getNumberOfThreads(<a href="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</a> 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> |
| </dl> |
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| <h4>setNumberOfThreads</h4> |
| <pre>public static void setNumberOfThreads(<a href="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</a> job, |
| int 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> |
| </dl> |
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| <h4>getMapperClass</h4> |
| <pre>public static <K1,V1,K2,V2> <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><<a href="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</a><K1,V1,K2,V2>> getMapperClass(<a href="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</a> job)</pre> |
| <div class="block">Get the application's mapper class.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>K1</code> - the map's input key type</dd> |
| <dd><code>V1</code> - the map's input value type</dd> |
| <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> |
| </dl> |
| </li> |
| </ul> |
| <a name="setMapperClass-org.apache.hadoop.mapreduce.Job-java.lang.Class-"> |
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| <h4>setMapperClass</h4> |
| <pre>public static <K1,V1,K2,V2> void setMapperClass(<a href="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</a> 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><? extends <a href="../../../../../../org/apache/hadoop/mapreduce/Mapper.html" title="class in org.apache.hadoop.mapreduce">Mapper</a><K1,V1,K2,V2>> cls)</pre> |
| <div class="block">Set the application's mapper class.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>K1</code> - the map input key type</dd> |
| <dd><code>V1</code> - the map input value type</dd> |
| <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> |
| </dl> |
| </li> |
| </ul> |
| <a name="run-org.apache.hadoop.mapreduce.Mapper.Context-"> |
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| <h4>run</h4> |
| <pre>public void run(org.apache.hadoop.mapreduce.Mapper.Context 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> |
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