org.apache.hadoop.hbase.chaos.monkies

Class PolicyBasedChaosMonkey

java.lang.Object

org.apache.hadoop.hbase.chaos.monkies.ChaosMonkey

org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey

All Implemented Interfaces:

Stoppable

public class PolicyBasedChaosMonkey
extends ChaosMonkey

Chaos monkey that given multiple policies will run actions against the cluster.

Field Summary

Fields

Modifier and Type	Field and Description
static long	TIMEOUT

Constructor Summary

Constructors

Constructor and Description
PolicyBasedChaosMonkey(IntegrationTestingUtility util, Collection<Policy> policies)
PolicyBasedChaosMonkey(IntegrationTestingUtility util, Policy... policies) Construct a new ChaosMonkey

Method Summary

Modifier and Type	Method and Description
boolean	isDestructive() Returns whether the CM does destructive actions (killing servers) so that a cluster restore is needed after CM is stopped.
boolean	isStopped()
static <T> T	selectRandomItem(T[] items) Selects a random item from the given items
static <T> List<T>	selectRandomItems(T[] items, float ratio) Selects and returns ceil(ratio * items.length) random items from the given array
static <T> T	selectWeightedRandomItem(List<Pair<T,Integer>> items) Selects a random item from the given items with weights
void	start()
void	stop(String why) Stop this service.
void	waitForStop() Wait for ChaosMonkey to stop.

Methods inherited from class java.lang.Object

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

Field Detail

TIMEOUT

public static final long TIMEOUT

See Also:

Constant Field Values

Constructor Detail

PolicyBasedChaosMonkey

public PolicyBasedChaosMonkey(IntegrationTestingUtility util,
                              Policy... policies)

Construct a new ChaosMonkey

Parameters:

util - the HBaseIntegrationTestingUtility already configured

policies - custom policies to use

PolicyBasedChaosMonkey

public PolicyBasedChaosMonkey(IntegrationTestingUtility util,
                              Collection<Policy> policies)

Method Detail

selectRandomItem

public static <T> T selectRandomItem(T[] items)

Selects a random item from the given items

selectWeightedRandomItem

public static <T> T selectWeightedRandomItem(List<Pair<T,Integer>> items)

Selects a random item from the given items with weights

selectRandomItems

public static <T> List<T> selectRandomItems(T[] items,
                                            float ratio)

Selects and returns ceil(ratio * items.length) random items from the given array

start

public void start()
           throws Exception

Specified by:

start in class ChaosMonkey

Throws:

Exception

stop

public void stop(String why)

Description copied from interface: Stoppable

Stop this service.

Specified by:

stop in interface Stoppable

Specified by:

stop in class ChaosMonkey

Parameters:

why - Why we're stopping.

isStopped

public boolean isStopped()

Specified by:

isStopped in interface Stoppable

Specified by:

isStopped in class ChaosMonkey

Returns:

True if Stoppable.stop(String) has been closed.

waitForStop

public void waitForStop()
                 throws InterruptedException

Wait for ChaosMonkey to stop.

Specified by:

waitForStop in class ChaosMonkey

Throws:

InterruptedException

isDestructive

public boolean isDestructive()

Description copied from class: ChaosMonkey

Returns whether the CM does destructive actions (killing servers) so that a cluster restore is needed after CM is stopped. Otherwise cluster will be left as it is

Specified by:

isDestructive in class ChaosMonkey