Package org.apache.cassandra.locator

Class SimpleStrategy

java.lang.Object

org.apache.cassandra.locator.AbstractReplicationStrategy

org.apache.cassandra.locator.SimpleStrategy

public class SimpleStrategy
extends AbstractReplicationStrategy

This class returns the nodes responsible for a given key but does not respect rack awareness. Basically returns the RF nodes that lie right next to each other on the ring.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	REPLICATION_FACTOR

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

configOptions, keyspaceName, snitch

Constructor Summary

Constructors

Constructor	Description
SimpleStrategy(String keyspaceName, TokenMetadata tokenMetadata, IEndpointSnitch snitch, Map<String,String> configOptions)

Method Summary

Modifier and Type	Method	Description
EndpointsForRange	calculateNaturalReplicas(Token token, TokenMetadata metadata)	Calculate the natural endpoints for the given token.
ReplicationFactor	getReplicationFactor()	calculate the RF based on strategy_options.
void	maybeWarnOnOptions(ClientState state)
protected static void	prepareOptions(Map<String,String> options, Map<String,String> previousOptions)
Collection<String>	recognizedOptions()
void	validateOptions()

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

createReplicationStrategy, getAddressReplicas, getAddressReplicas, getAddressReplicas, getAddressReplicas, getCachedReplicas, getClass, getLocalReplicaFor, getNaturalReplicas, getNaturalReplicasForToken, getPendingAddressRanges, getPendingAddressRanges, getRangeAddresses, getWriteResponseHandler, getWriteResponseHandler, hasSameSettings, hasTransientReplicas, isTokenInLocalNaturalOrPendingRange, maybeWarnOnOptions, prepareReplicationStrategyOptions, validateExpectedOptions, validateReplicationFactor, validateReplicationStrategy

Methods inherited from class java.lang.Object

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

Field Details

REPLICATION_FACTOR

public static final String REPLICATION_FACTOR

See Also:

• Constant Field Values

Constructor Details

SimpleStrategy

public SimpleStrategy(String keyspaceName,
 TokenMetadata tokenMetadata,
 IEndpointSnitch snitch,
 Map<String,String> configOptions)

Method Details

calculateNaturalReplicas

public EndpointsForRange calculateNaturalReplicas(Token token,
 TokenMetadata metadata)

Description copied from class: AbstractReplicationStrategy

Calculate the natural endpoints for the given token. Endpoints are returned in the order they occur in the ring following the searchToken, as defined by the replication strategy. Note that the order of the replicas is _implicitly relied upon_ by the definition of "primary" range in StorageService.getPrimaryRangesForEndpoint(String, InetAddressAndPort) which is in turn relied on by various components like repair and size estimate calculations.

Specified by:

calculateNaturalReplicas in class AbstractReplicationStrategy

Parameters:

token - the token to find the natural endpoints for

metadata - the token metadata used to find the searchToken, e.g. contains token to endpoint mapping information

Returns:

a copy of the natural endpoints for the given token

See Also:

• AbstractReplicationStrategy.getNaturalReplicasForToken(org.apache.cassandra.dht.RingPosition)

getReplicationFactor

public ReplicationFactor 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

maybeWarnOnOptions

public void maybeWarnOnOptions(ClientState state)

Overrides:

maybeWarnOnOptions in class AbstractReplicationStrategy

recognizedOptions

public Collection<String> recognizedOptions()

Overrides:

recognizedOptions in class AbstractReplicationStrategy

prepareOptions

protected static void prepareOptions(Map<String,String> options,
 Map<String,String> previousOptions)