org.apache.slider.server.appmaster.monkey

Class ChaosMonkeyService

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.slider.server.appmaster.monkey.ChaosMonkeyService

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.service.Service

public class ChaosMonkeyService
extends org.apache.hadoop.service.AbstractService

A chaos monkey service which will invoke ChaosTarget events

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.service.Service

org.apache.hadoop.service.Service.STATE

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.slf4j.Logger	log

Constructor Summary

Constructors

Constructor and Description
ChaosMonkeyService(com.codahale.metrics.MetricRegistry metrics, QueueAccess queues)

Method Summary

Methods

Modifier and Type	Method and Description
void	addTarget(String name, ChaosTarget target, long probability) Add a target ...
boolean	chaosCheck(long probability) Check for callers to see if chaos should be triggered; shares the same random number source as the rest of the monkey entries
RenewingAction<MonkeyPlayAction>	getChaosAction(long delay, long interval, TimeUnit timeUnit) Get the chaos action
int	getTargetCount() Get the number of targets in the list
void	play() Iterate through all the entries and invoke chaos on those wanted
int	randomPercentage()
boolean	schedule(long delay, long interval, TimeUnit timeUnit) Schedule the monkey

Methods inherited from class org.apache.hadoop.service.AbstractService

close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, noteFailure, putBlocker, registerGlobalListener, registerServiceListener, removeBlocker, serviceInit, serviceStart, serviceStop, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final org.slf4j.Logger log

Constructor Detail

ChaosMonkeyService

public ChaosMonkeyService(com.codahale.metrics.MetricRegistry metrics,
                  QueueAccess queues)

Method Detail

addTarget

public void addTarget(String name,
             ChaosTarget target,
             long probability)

Add a target ... it is only added if probability > 0

Parameters:

name - name

target - chaos target

probability - probability

getTargetCount

public int getTargetCount()

Get the number of targets in the list

Returns:

the count of added targets

play

public void play()

Iterate through all the entries and invoke chaos on those wanted

randomPercentage

public int randomPercentage()

chaosCheck

public boolean chaosCheck(long probability)

Check for callers to see if chaos should be triggered; shares the same random number source as the rest of the monkey entries

Parameters:

probability - probability

Returns:

true if the action should happen

schedule

public boolean schedule(long delay,
               long interval,
               TimeUnit timeUnit)

Schedule the monkey

Parameters:

delay - initial delay

timeUnit - time unit

Returns:

true if it was scheduled (i.e. 1+ action) and interval > 0

getChaosAction

public RenewingAction<MonkeyPlayAction> getChaosAction(long delay,
                                              long interval,
                                              TimeUnit timeUnit)

Get the chaos action

Parameters:

delay -

timeUnit - time unit

Returns:

the action to schedule