org.apache.cassandra.locator

Class YamlFileNetworkTopologySnitch

java.lang.Object

org.apache.cassandra.locator.AbstractEndpointSnitch

org.apache.cassandra.locator.AbstractNetworkTopologySnitch

org.apache.cassandra.locator.YamlFileNetworkTopologySnitch

All Implemented Interfaces:

IEndpointSnitch

public class YamlFileNetworkTopologySnitch
extends AbstractNetworkTopologySnitch

Network topology snitch that reads its configuration from a YAML file.

This snitch supports connections over preferred addresses, such as a data-center-local address, based on the reconnection trick used in Ec2MultiRegionSnitch. The configuration file, cassandra-topology.yaml, is checked periodically for updates.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	YamlFileNetworkTopologySnitch.Datacenter Data center object type for the YAML topology configuration.
static class	YamlFileNetworkTopologySnitch.Node Node object type for the YAML topology configuration.
static class	YamlFileNetworkTopologySnitch.Rack Rack object type for the YAML topology configuration.
static class	YamlFileNetworkTopologySnitch.TopologyConfig Root object type for the YAML topology configuration.

Constructor Summary

Constructors

Constructor and Description
YamlFileNetworkTopologySnitch() Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.String	getDatacenter(java.net.InetAddress endpoint) Returns the name of the data center for the endpoint, or UNKNOWN if not known.
java.lang.String	getRack(java.net.InetAddress endpoint) Returns the name of the rack for the endpoint, or UNKNOWN if not known.
void	gossiperStarting() Called in preparation for the initiation of the gossip loop.

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

compareEndpoints

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

getSortedListByProximity, isWorthMergingForRangeQuery, sortByProximity

Methods inherited from class java.lang.Object

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

Constructor Detail

YamlFileNetworkTopologySnitch

public YamlFileNetworkTopologySnitch()
                              throws ConfigurationException

Constructor.

Throws:

ConfigurationException - on failure

Method Detail

getRack

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

Returns the name of the rack for the endpoint, or UNKNOWN if not known.

Specified by:

getRack in interface IEndpointSnitch

Specified by:

getRack in class AbstractNetworkTopologySnitch

Parameters:

endpoint - a specified endpoint

Returns:

the name of the data center for the endpoint, or UNKNOWN if not known

getDatacenter

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

Returns the name of the data center for the endpoint, or UNKNOWN if not known.

Specified by:

getDatacenter in interface IEndpointSnitch

Specified by:

getDatacenter in class AbstractNetworkTopologySnitch

Parameters:

endpoint - a specified endpoint

Returns:

the name of the data center for the endpoint, or UNKNOWN if not known

gossiperStarting

public void gossiperStarting()

Called in preparation for the initiation of the gossip loop.

Specified by:

gossiperStarting in interface IEndpointSnitch

Overrides:

gossiperStarting in class AbstractEndpointSnitch