org.apache.cassandra.locator

Class OldNetworkTopologyStrategy

java.lang.Object

org.apache.cassandra.locator.AbstractReplicationStrategy

org.apache.cassandra.locator.OldNetworkTopologyStrategy

public class OldNetworkTopologyStrategy
extends AbstractReplicationStrategy

This Replication Strategy returns the nodes responsible for a given key but respects rack awareness. It places one replica in a different data center from the first (if there is any such data center), the third replica in a different rack in the first datacenter, and any remaining replicas on the first unused nodes on the ring.

Field Summary

Fields inherited from class org.apache.cassandra.locator.AbstractReplicationStrategy

configOptions, snitch

Constructor Summary

Constructors

Constructor and Description
OldNetworkTopologyStrategy(java.lang.String keyspaceName, TokenMetadata tokenMetadata, IEndpointSnitch snitch, java.util.Map<java.lang.String,java.lang.String> configOptions)

Method Summary

Methods

Modifier and Type	Method and Description
java.util.List<java.net.InetAddress>	calculateNaturalEndpoints(Token token, TokenMetadata metadata) calculate the natural endpoints for the given token
int	getReplicationFactor() calculate the RF based on strategy_options.
java.util.Collection<java.lang.String>	recognizedOptions()
void	validateOptions()

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

createReplicationStrategy, getAddressRanges, getAddressRanges, getCachedEndpoints, getClass, getNaturalEndpoints, getPendingAddressRanges, getPendingAddressRanges, getRangeAddresses, getWriteResponseHandler, validateReplicationFactor, validateReplicationStrategy

Methods inherited from class java.lang.Object

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

Constructor Detail

OldNetworkTopologyStrategy

public OldNetworkTopologyStrategy(java.lang.String keyspaceName,
                          TokenMetadata tokenMetadata,
                          IEndpointSnitch snitch,
                          java.util.Map<java.lang.String,java.lang.String> configOptions)

Method Detail

calculateNaturalEndpoints

public java.util.List<java.net.InetAddress> calculateNaturalEndpoints(Token token,
                                                             TokenMetadata metadata)

Description copied from class: AbstractReplicationStrategy

calculate the natural endpoints for the given token

Specified by:

calculateNaturalEndpoints in class AbstractReplicationStrategy

Parameters:

token - the token the natural endpoints are requested for

Returns:

a copy of the natural endpoints for the given token

See Also:

AbstractReplicationStrategy.getNaturalEndpoints(org.apache.cassandra.dht.RingPosition)

getReplicationFactor

public int getReplicationFactor()

Description copied from class: AbstractReplicationStrategy

calculate the RF based on strategy_options. When overwriting, ensure that this get() is FAST, as this is called often.

Specified by:

getReplicationFactor in class AbstractReplicationStrategy

Returns:

the replication factor

validateOptions

public void validateOptions()
                     throws ConfigurationException

Specified by:

validateOptions in class AbstractReplicationStrategy

Throws:

ConfigurationException

recognizedOptions

public java.util.Collection<java.lang.String> recognizedOptions()

Overrides:

recognizedOptions in class AbstractReplicationStrategy