org.apache.cassandra.gms

Class FailureDetector

java.lang.Object

org.apache.cassandra.gms.FailureDetector

All Implemented Interfaces:

FailureDetectorMBean, IFailureDetector

public class FailureDetector
extends java.lang.Object
implements IFailureDetector, FailureDetectorMBean

This FailureDetector is an implementation of the paper titled "The Phi Accrual Failure Detector" by Hayashibara. Check the paper and the IFailureDetector interface for details.

Field Summary

Fields

Modifier and Type	Field and Description
protected static long	INITIAL_VALUE_NANOS
static IFailureDetector	instance
static java.lang.String	MBEAN_NAME

Constructor Summary

Constructors

Constructor and Description
FailureDetector()

Method Summary

Modifier and Type	Method and Description
void	dumpInterArrivalTimes() Dump the inter arrival times for examination if necessary.
void	forceConviction(java.net.InetAddress ep) force conviction of endpoint in the failure detector
java.lang.String	getAllEndpointStates()
int	getDownEndpointCount()
java.lang.String	getEndpointState(java.lang.String address)
double	getPhiConvictThreshold()
java.util.Map<java.lang.String,java.lang.String>	getSimpleStates()
int	getUpEndpointCount()
void	interpret(java.net.InetAddress ep) This method is invoked by any entity wanting to interrogate the status of an endpoint.
boolean	isAlive(java.net.InetAddress ep) Failure Detector's knowledge of whether a node is up or down.
static void	main(java.lang.String[] args)
void	registerFailureDetectionEventListener(IFailureDetectionEventListener listener) Register interest for Failure Detector events.
void	remove(java.net.InetAddress ep) remove endpoint from failure detector
void	report(java.net.InetAddress ep) This method is invoked by the receiver of the heartbeat.
void	setPhiConvictThreshold(double phi)
java.lang.String	toString()
void	unregisterFailureDetectionEventListener(IFailureDetectionEventListener listener) Un-register interest for Failure Detector events.

Methods inherited from class java.lang.Object

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

Field Detail

MBEAN_NAME

public static final java.lang.String MBEAN_NAME

See Also:

Constant Field Values

INITIAL_VALUE_NANOS

protected static final long INITIAL_VALUE_NANOS

instance

public static final IFailureDetector instance

Constructor Detail

FailureDetector

public FailureDetector()

Method Detail

getAllEndpointStates

public java.lang.String getAllEndpointStates()

Specified by:

getAllEndpointStates in interface FailureDetectorMBean

getSimpleStates

public java.util.Map<java.lang.String,java.lang.String> getSimpleStates()

Specified by:

getSimpleStates in interface FailureDetectorMBean

getDownEndpointCount

public int getDownEndpointCount()

Specified by:

getDownEndpointCount in interface FailureDetectorMBean

getUpEndpointCount

public int getUpEndpointCount()

Specified by:

getUpEndpointCount in interface FailureDetectorMBean

getEndpointState

public java.lang.String getEndpointState(java.lang.String address)
                                  throws java.net.UnknownHostException

Specified by:

getEndpointState in interface FailureDetectorMBean

Throws:

java.net.UnknownHostException

dumpInterArrivalTimes

public void dumpInterArrivalTimes()

Dump the inter arrival times for examination if necessary.

Specified by:

dumpInterArrivalTimes in interface FailureDetectorMBean

setPhiConvictThreshold

public void setPhiConvictThreshold(double phi)

Specified by:

setPhiConvictThreshold in interface FailureDetectorMBean

getPhiConvictThreshold

public double getPhiConvictThreshold()

Specified by:

getPhiConvictThreshold in interface FailureDetectorMBean

isAlive

public boolean isAlive(java.net.InetAddress ep)

Description copied from interface: IFailureDetector

Failure Detector's knowledge of whether a node is up or down.

Specified by:

isAlive in interface IFailureDetector

Parameters:

ep - endpoint in question.

Returns:

true if UP and false if DOWN.

report

public void report(java.net.InetAddress ep)

Description copied from interface: IFailureDetector

This method is invoked by the receiver of the heartbeat. In our case it would be the Gossiper. Gossiper inform the Failure Detector on receipt of a heartbeat. The FailureDetector will then sample the arrival time as explained in the paper.

param ep endpoint being reported.

Specified by:

report in interface IFailureDetector

interpret

public void interpret(java.net.InetAddress ep)

Description copied from interface: IFailureDetector

This method is invoked by any entity wanting to interrogate the status of an endpoint. In our case it would be the Gossiper. The Failure Detector will then calculate Phi and deem an endpoint as suspicious or alive as explained in the Hayashibara paper.

param ep endpoint for which we interpret the inter arrival times.

Specified by:

interpret in interface IFailureDetector

forceConviction

public void forceConviction(java.net.InetAddress ep)

Description copied from interface: IFailureDetector

force conviction of endpoint in the failure detector

Specified by:

forceConviction in interface IFailureDetector

remove

public void remove(java.net.InetAddress ep)

Description copied from interface: IFailureDetector

remove endpoint from failure detector

Specified by:

remove in interface IFailureDetector

registerFailureDetectionEventListener

public void registerFailureDetectionEventListener(IFailureDetectionEventListener listener)

Description copied from interface: IFailureDetector

Register interest for Failure Detector events.

Specified by:

registerFailureDetectionEventListener in interface IFailureDetector

Parameters:

listener - implementation of an application provided IFailureDetectionEventListener

unregisterFailureDetectionEventListener

public void unregisterFailureDetectionEventListener(IFailureDetectionEventListener listener)

Description copied from interface: IFailureDetector

Un-register interest for Failure Detector events.

Specified by:

unregisterFailureDetectionEventListener in interface IFailureDetector

Parameters:

listener - implementation of an application provided IFailureDetectionEventListener

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

main

public static void main(java.lang.String[] args)