org.apache.cassandra.locator

Class SimpleSnitch

java.lang.Object

org.apache.cassandra.locator.AbstractEndpointSnitch

org.apache.cassandra.locator.SimpleSnitch

All Implemented Interfaces:

IEndpointSnitch

public class SimpleSnitch
extends AbstractEndpointSnitch

A simple endpoint snitch implementation that treats Strategy order as proximity, allowing non-read-repaired reads to prefer a single endpoint, which improves cache locality.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	DATA_CENTER_NAME
static java.lang.String	RACK_NAME

Constructor Summary

Constructors

Constructor and Description
SimpleSnitch()

Method Summary

Modifier and Type	Method and Description
int	compareEndpoints(InetAddressAndPort target, Replica r1, Replica r2) compares two endpoints in relation to the target endpoint, returning as Comparator.compare would
java.lang.String	getDatacenter(InetAddressAndPort endpoint) returns a String representing the datacenter the given endpoint belongs to
java.lang.String	getRack(InetAddressAndPort endpoint) returns a String representing the rack the given endpoint belongs to
<C extends ReplicaCollection<? extends C>> C	sortedByProximity(InetAddressAndPort address, C unsortedAddress) Sorts the Collection of node addresses by proximity to the given address

Methods inherited from class org.apache.cassandra.locator.AbstractEndpointSnitch

gossiperStarting, isWorthMergingForRangeQuery

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.locator.IEndpointSnitch

getDatacenter, getLocalDatacenter, getLocalRack, validate

Field Detail

DATA_CENTER_NAME

public static final java.lang.String DATA_CENTER_NAME

See Also:

Constant Field Values

RACK_NAME

public static final java.lang.String RACK_NAME

See Also:

Constant Field Values

Constructor Detail

SimpleSnitch

public SimpleSnitch()

Method Detail

getRack

public java.lang.String getRack(InetAddressAndPort endpoint)

Description copied from interface: IEndpointSnitch

returns a String representing the rack the given endpoint belongs to

getDatacenter

public java.lang.String getDatacenter(InetAddressAndPort endpoint)

Description copied from interface: IEndpointSnitch

returns a String representing the datacenter the given endpoint belongs to

sortedByProximity

public <C extends ReplicaCollection<? extends C>> C sortedByProximity(InetAddressAndPort address,
                                                                      C unsortedAddress)

Description copied from class: AbstractEndpointSnitch

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

Specified by:

sortedByProximity in interface IEndpointSnitch

Overrides:

sortedByProximity in class AbstractEndpointSnitch

Parameters:

address - the address to sort by proximity to

unsortedAddress - the nodes to sort

Returns:

a new sorted List

compareEndpoints

public int compareEndpoints(InetAddressAndPort target,
                            Replica r1,
                            Replica r2)

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