Package hudson.plugins.ec2

Class EC2SpotInterruptionMonitor

java.lang.Object

java.util.TimerTask

hudson.triggers.SafeTimerTask

hudson.model.PeriodicWork

hudson.plugins.ec2.EC2SpotInterruptionMonitor

All Implemented Interfaces:

ExtensionPoint, Runnable

@Extension
public class EC2SpotInterruptionMonitor
extends PeriodicWork

Retires spot agents that EC2 has given notice on.

An interrupted instance has about two minutes left. Work handed to it in that window is work that will be lost, so an agent under notice is taken out of service straight away and terminated once whatever it was already running has finished. A build that is already under way cannot be saved, but nothing new needs to be thrown after it.

The notice is read from the instance rather than from EC2. It is the same signal AWS documents for the purpose, it arrives without waiting for an API to catch up, and asking costs nothing that counts against an API limit, which matters when the question is asked of every agent every few seconds. An on-demand instance simply answers that there is no notice.

Nested Class Summary

Nested classes/interfaces inherited from class hudson.triggers.SafeTimerTask

SafeTimerTask.ExceptionRunnable

Nested classes/interfaces inherited from interface hudson.ExtensionPoint

ExtensionPoint.LegacyInstancesAreScopedToHudson

Field Summary

Fields inherited from class hudson.model.PeriodicWork

DAY, HOUR, logger, MIN

Constructor Summary

Constructors

Constructor	Description
EC2SpotInterruptionMonitor()

Method Summary

Modifier and Type	Method	Description
protected void	doRun()
long	getRecurrencePeriod()

Methods inherited from class hudson.model.PeriodicWork

all, getInitialDelay, init

Methods inherited from class hudson.triggers.SafeTimerTask

getLogsRoot, of, run

Methods inherited from class java.util.TimerTask

cancel, scheduledExecutionTime

Methods inherited from class java.lang.Object

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

Constructor Details

EC2SpotInterruptionMonitor

public EC2SpotInterruptionMonitor()

Method Details

getRecurrencePeriod

public long getRecurrencePeriod()

Specified by:

getRecurrencePeriod in class PeriodicWork

doRun

protected void doRun()

Specified by:

doRun in class SafeTimerTask