org.apache.cassandra.locator

Class DynamicEndpointSnitch

java.lang.Object

org.apache.cassandra.locator.AbstractEndpointSnitch

org.apache.cassandra.locator.DynamicEndpointSnitch

All Implemented Interfaces:

DynamicEndpointSnitchMBean, IEndpointSnitch, ILatencySubscriber

public class DynamicEndpointSnitch
extends AbstractEndpointSnitch
implements ILatencySubscriber, DynamicEndpointSnitchMBean

A dynamic snitch that sorts endpoints by latency with an adapted phi failure detector

Field Summary

Fields

Modifier and Type	Field and Description
IEndpointSnitch	subsnitch

Constructor Summary

Constructors

Constructor and Description
DynamicEndpointSnitch(IEndpointSnitch snitch)
DynamicEndpointSnitch(IEndpointSnitch snitch, java.lang.String instance)

Method Summary

Modifier and Type	Method and Description
int	compareEndpoints(java.net.InetAddress target, java.net.InetAddress a1, java.net.InetAddress a2) compares two endpoints in relation to the target endpoint, returning as Comparator.compare would
java.util.List<java.lang.Double>	dumpTimings(java.lang.String hostname)
double	getBadnessThreshold()
java.lang.String	getDatacenter(java.net.InetAddress endpoint) returns a String representing the datacenter this endpoint belongs to
java.lang.String	getRack(java.net.InetAddress endpoint) returns a String repesenting the rack this endpoint belongs to
int	getResetInterval()
java.util.Map<java.net.InetAddress,java.lang.Double>	getScores()
double	getSeverity()
java.util.List<java.net.InetAddress>	getSortedListByProximity(java.net.InetAddress address, java.util.Collection<java.net.InetAddress> addresses) Sorts the Collection of node addresses by proximity to the given address
java.lang.String	getSubsnitchClassName()
int	getUpdateInterval()
void	gossiperStarting() called after Gossiper instance exists immediately before it starts gossiping
boolean	isWorthMergingForRangeQuery(java.util.List<java.net.InetAddress> merged, java.util.List<java.net.InetAddress> l1, java.util.List<java.net.InetAddress> l2) Returns whether for a range query doing a query against merged is likely to be faster than 2 sequential queries, one against l1 followed by one against l2.
void	receiveTiming(java.net.InetAddress host, long latency)
void	setSeverity(double severity) Use this if you want to specify a severity; it can be negative Example: Page cache is cold and you want data to be sent though it is not preferred one.
void	sortByProximity(java.net.InetAddress address, java.util.List<java.net.InetAddress> addresses) Sorts the List of node addresses, in-place, by proximity to the given address
void	unregisterMBean()

Methods inherited from class java.lang.Object

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

Field Detail

subsnitch

public final IEndpointSnitch subsnitch

Constructor Detail

DynamicEndpointSnitch

public DynamicEndpointSnitch(IEndpointSnitch snitch)

DynamicEndpointSnitch

public DynamicEndpointSnitch(IEndpointSnitch snitch,
                             java.lang.String instance)

Method Detail

unregisterMBean

public void unregisterMBean()

gossiperStarting

public void gossiperStarting()

Description copied from interface: IEndpointSnitch

called after Gossiper instance exists immediately before it starts gossiping

Specified by:

gossiperStarting in interface IEndpointSnitch

Overrides:

gossiperStarting in class AbstractEndpointSnitch

getRack

public java.lang.String getRack(java.net.InetAddress endpoint)

Description copied from interface: IEndpointSnitch

returns a String repesenting the rack this endpoint belongs to

Specified by:

getRack in interface IEndpointSnitch

getDatacenter

public java.lang.String getDatacenter(java.net.InetAddress endpoint)

Description copied from interface: IEndpointSnitch

returns a String representing the datacenter this endpoint belongs to

Specified by:

getDatacenter in interface IEndpointSnitch

getSortedListByProximity

public java.util.List<java.net.InetAddress> getSortedListByProximity(java.net.InetAddress address,
                                                                     java.util.Collection<java.net.InetAddress> addresses)

Description copied from class: AbstractEndpointSnitch

Sorts the Collection of node addresses by proximity to the given address

Specified by:

getSortedListByProximity in interface IEndpointSnitch

Overrides:

getSortedListByProximity in class AbstractEndpointSnitch

Parameters:

address - the address to sort by proximity to

addresses - the nodes to sort

Returns:

a new sorted List

sortByProximity

public void sortByProximity(java.net.InetAddress address,
                            java.util.List<java.net.InetAddress> addresses)

Description copied from class: AbstractEndpointSnitch

Sorts the List of node addresses, in-place, by proximity to the given address

Specified by:

sortByProximity in interface IEndpointSnitch

Overrides:

sortByProximity in class AbstractEndpointSnitch

Parameters:

address - the address to sort the proximity by

addresses - the nodes to sort

compareEndpoints

public int compareEndpoints(java.net.InetAddress target,
                            java.net.InetAddress a1,
                            java.net.InetAddress a2)

Description copied from interface: IEndpointSnitch

compares two endpoints in relation to the target endpoint, returning as Comparator.compare would

Specified by:

compareEndpoints in interface IEndpointSnitch

Specified by:

compareEndpoints in class AbstractEndpointSnitch

receiveTiming

public void receiveTiming(java.net.InetAddress host,
                          long latency)

Specified by:

receiveTiming in interface ILatencySubscriber

getScores

public java.util.Map<java.net.InetAddress,java.lang.Double> getScores()

Specified by:

getScores in interface DynamicEndpointSnitchMBean

getUpdateInterval

public int getUpdateInterval()

Specified by:

getUpdateInterval in interface DynamicEndpointSnitchMBean

getResetInterval

public int getResetInterval()

Specified by:

getResetInterval in interface DynamicEndpointSnitchMBean

getBadnessThreshold

public double getBadnessThreshold()

Specified by:

getBadnessThreshold in interface DynamicEndpointSnitchMBean

getSubsnitchClassName

public java.lang.String getSubsnitchClassName()

Specified by:

getSubsnitchClassName in interface DynamicEndpointSnitchMBean

dumpTimings

public java.util.List<java.lang.Double> dumpTimings(java.lang.String hostname)
                                             throws java.net.UnknownHostException

Specified by:

dumpTimings in interface DynamicEndpointSnitchMBean

Throws:

java.net.UnknownHostException

setSeverity

public void setSeverity(double severity)

Description copied from interface: DynamicEndpointSnitchMBean

Use this if you want to specify a severity; it can be negative Example: Page cache is cold and you want data to be sent though it is not preferred one.

Specified by:

setSeverity in interface DynamicEndpointSnitchMBean

getSeverity

public double getSeverity()

Specified by:

getSeverity in interface DynamicEndpointSnitchMBean

isWorthMergingForRangeQuery

public boolean isWorthMergingForRangeQuery(java.util.List<java.net.InetAddress> merged,
                                           java.util.List<java.net.InetAddress> l1,
                                           java.util.List<java.net.InetAddress> l2)

Description copied from interface: IEndpointSnitch

Returns whether for a range query doing a query against merged is likely to be faster than 2 sequential queries, one against l1 followed by one against l2.

Specified by:

isWorthMergingForRangeQuery in interface IEndpointSnitch

Overrides:

isWorthMergingForRangeQuery in class AbstractEndpointSnitch