org.apache.hadoop.mapreduce.task.reduce

Class DirectShuffleEventFetcher<K,V>

java.lang.Object

java.lang.Thread

org.apache.hadoop.mapreduce.task.reduce.DirectShuffleEventFetcher<K,V>

All Implemented Interfaces:

Runnable

public class DirectShuffleEventFetcher<K,V>
extends Thread

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Constructor and Description
DirectShuffleEventFetcher(org.apache.hadoop.mapreduce.TaskAttemptID reduce, org.apache.hadoop.mapred.TaskUmbilicalProtocol umbilical, org.apache.hadoop.mapreduce.task.reduce.ShuffleScheduler<K,V> scheduler, org.apache.hadoop.mapreduce.task.reduce.ExceptionReporter reporter, int maxEventsToFetch)

Method Summary

Methods

Modifier and Type	Method and Description
protected int	getMapCompletionEvents() Queries the TaskTracker for a set of map-completion events from a given event ID.
void	run()
void	shutDown()

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DirectShuffleEventFetcher

public DirectShuffleEventFetcher(org.apache.hadoop.mapreduce.TaskAttemptID reduce,
                         org.apache.hadoop.mapred.TaskUmbilicalProtocol umbilical,
                         org.apache.hadoop.mapreduce.task.reduce.ShuffleScheduler<K,V> scheduler,
                         org.apache.hadoop.mapreduce.task.reduce.ExceptionReporter reporter,
                         int maxEventsToFetch)

Method Detail

run

public void run()

Specified by:

run in interface Runnable

Overrides:

run in class Thread

shutDown

public void shutDown()

getMapCompletionEvents

protected int getMapCompletionEvents()
                              throws IOException,
                                     InterruptedException

Queries the TaskTracker for a set of map-completion events from a given event ID.

Throws:

IOException

InterruptedException