org.apache.spark.scheduler

Class AsyncEventQueue

Object

org.apache.spark.scheduler.AsyncEventQueue

All Implemented Interfaces:

Logging, SparkListenerBus, ListenerBus<SparkListenerInterface,SparkListenerEvent>

public class AsyncEventQueue
extends Object
implements SparkListenerBus, Logging

An asynchronous queue for events. All events posted to this queue will be delivered to the child listeners in a separate thread.

Delivery will only begin when the start() method is called. The stop() method should be called when no more events need to be delivered.

Constructor Summary

Constructors

Constructor and Description
AsyncEventQueue(String name, SparkConf conf, org.apache.spark.scheduler.LiveListenerBusMetrics metrics, org.apache.spark.scheduler.LiveListenerBus bus)

Method Summary

Modifier and Type	Method and Description
String	name()
static Object	POISON_PILL()
void	post(SparkListenerEvent event)
void	removeListenerOnError(SparkListenerInterface listener) This can be overridden by subclasses if there is any extra cleanup to do when removing a listener.
boolean	waitUntilEmpty(long deadline) For testing only.

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.spark.scheduler.SparkListenerBus

doPostEvent

Methods inherited from interface org.apache.spark.util.ListenerBus

addListener, findListenersByClass, isIgnorableException, listeners, postToAll, removeAllListeners, removeListener

Methods inherited from interface org.apache.spark.internal.Logging

initializeLogging, initializeLogIfNecessary, initializeLogIfNecessary, isTraceEnabled, log, logDebug, logDebug, logError, logError, logInfo, logInfo, logName, logTrace, logTrace, logWarning, logWarning

Constructor Detail

AsyncEventQueue

public AsyncEventQueue(String name,
                       SparkConf conf,
                       org.apache.spark.scheduler.LiveListenerBusMetrics metrics,
                       org.apache.spark.scheduler.LiveListenerBus bus)

Method Detail

POISON_PILL

public static Object POISON_PILL()

name

public String name()

post

public void post(SparkListenerEvent event)

waitUntilEmpty

public boolean waitUntilEmpty(long deadline)

For testing only. Wait until there are no more events in the queue.

Parameters:

deadline - (undocumented)

Returns:

true if the queue is empty.

removeListenerOnError

public void removeListenerOnError(SparkListenerInterface listener)

Description copied from interface: ListenerBus

This can be overridden by subclasses if there is any extra cleanup to do when removing a listener. In particular AsyncEventQueues can clean up queues in the LiveListenerBus.

Specified by:

removeListenerOnError in interface ListenerBus<SparkListenerInterface,SparkListenerEvent>

Parameters:

listener - (undocumented)