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java.lang.Object org.apache.hadoop.mapreduce.Mapper<K1,V1,K2,V2> org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper<K1,V1,K2,V2>
public class MultithreadedMapper<K1,V1,K2,V2>
Multithreaded implementation for @link org.apache.hadoop.mapreduce.Mapper.
It can be used instead of the default implementation,
Nested Class Summary |
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Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper |
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Mapper.Context |
Constructor Summary | |
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MultithreadedMapper()
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Method Summary | ||
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static
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getMapperClass(JobContext job)
Get the application's mapper class. |
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static int |
getNumberOfThreads(JobContext job)
The number of threads in the thread pool that will run the map function. |
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void |
run(Mapper.Context context)
Run the application's maps using a thread pool. |
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static
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setMapperClass(Job job,
Class<? extends Mapper<K1,V1,K2,V2>> cls)
Set the application's mapper class. |
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static void |
setNumberOfThreads(Job job,
int threads)
Set the number of threads in the pool for running maps. |
Methods inherited from class org.apache.hadoop.mapreduce.Mapper |
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cleanup, map, setup |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MultithreadedMapper()
Method Detail |
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public static int getNumberOfThreads(JobContext job)
job
- the job
public static void setNumberOfThreads(Job job, int threads)
job
- the job to modifythreads
- the new number of threadspublic static <K1,V1,K2,V2> Class<Mapper<K1,V1,K2,V2>> getMapperClass(JobContext job)
K1
- the map's input key typeV1
- the map's input value typeK2
- the map's output key typeV2
- the map's output value typejob
- the job
public static <K1,V1,K2,V2> void setMapperClass(Job job, Class<? extends Mapper<K1,V1,K2,V2>> cls)
K1
- the map input key typeV1
- the map input value typeK2
- the map output key typeV2
- the map output value typejob
- the job to modifycls
- the class to use as the mapperpublic void run(Mapper.Context context) throws IOException, InterruptedException
run
in class Mapper<K1,V1,K2,V2>
IOException
InterruptedException
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