|
||||||||||
| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD | |||||||||
java.lang.Objectorg.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 |
|---|
| Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper |
|---|
Mapper.Context |
| Constructor Summary | |
|---|---|
MultithreadedMapper()
|
|
| Method Summary | ||
|---|---|---|
static
|
getMapperClass(JobContext job)
Get the application's mapper class. |
|
static int |
getNumberOfThreads(JobContext job)
The number of threads in the thread pool that will run the map function. |
|
void |
run(Mapper.Context context)
Run the application's maps using a thread pool. |
|
static
|
setMapperClass(Job job,
Class<? extends Mapper<K1,V1,K2,V2>> cls)
Set the application's mapper class. |
|
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 |
|---|
cleanup, map, setup |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public MultithreadedMapper()
| Method Detail |
|---|
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 mapper
public void run(Mapper.Context context)
throws IOException,
InterruptedException
run in class Mapper<K1,V1,K2,V2>IOException
InterruptedException
|
||||||||||
| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD | |||||||||