C# Class Dse.Policies.DseLoadBalancingPolicy

A load balancing policy designed to run against DSE cluster.

For most executions, the query plan will be determined by the child load balancing policy. Except for some cases, like graph analytics queries, for which it uses the preferred analytics graph server previously obtained by driver as first host in the query plan.

Inheritance: ILoadBalancingPolicy

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Public Methods

Method	Description
CreateDefault ( ) : DseLoadBalancingPolicy	Creates the default load balancing policy, using Cassandra.Policies.DefaultLoadBalancingPolicy as child policy.
Distance ( Cassandra.Host host ) : HostDistance	Returns the distance as determined by the child policy.
DseLoadBalancingPolicy ( ILoadBalancingPolicy childPolicy ) : System	Creates a new instance of DseLoadBalancingPolicy wrapping the provided child policy.
DseLoadBalancingPolicy ( string localDc, int usedHostsPerRemoteDc ) : System	Creates a new instance of DseLoadBalancingPolicy given the name of the local datacenter and the amount of host per remote datacenter to use for failover for the local hosts.
Initialize ( ICluster cluster ) : void	Initializes the policy.
NewQueryPlan ( string keyspace, IStatement statement ) : IEnumerable	Returns the hosts to used for a query.

Private Methods

Method	Description
YieldPreferred ( string keyspace, TargettedSimpleStatement statement ) : IEnumerable

Method Details

CreateDefault() public static method

Creates the default load balancing policy, using Cassandra.Policies.DefaultLoadBalancingPolicy as child policy.

public static CreateDefault ( ) : DseLoadBalancingPolicy
return	DseLoadBalancingPolicy

Distance() public method

Returns the distance as determined by the child policy.

public Distance ( Cassandra.Host host ) : HostDistance
host	Cassandra.Host
return	HostDistance

DseLoadBalancingPolicy() public method

Creates a new instance of DseLoadBalancingPolicy wrapping the provided child policy.

public DseLoadBalancingPolicy ( ILoadBalancingPolicy childPolicy ) : System
childPolicy	ILoadBalancingPolicy
return	System

DseLoadBalancingPolicy() public method

Creates a new instance of DseLoadBalancingPolicy given the name of the local datacenter and the amount of host per remote datacenter to use for failover for the local hosts.

public DseLoadBalancingPolicy ( string localDc, int usedHostsPerRemoteDc ) : System
localDc	string	The name of the local datacenter (case-sensitive)
usedHostsPerRemoteDc	int	/// The amount of host per remote datacenter that the policy should yield in a new query plan after the local /// nodes. ///
return	System

Initialize() public method

Initializes the policy.

public Initialize ( ICluster cluster ) : void
cluster	ICluster
return	void

NewQueryPlan() public method

Returns the hosts to used for a query.

public NewQueryPlan ( string keyspace, IStatement statement ) : IEnumerable
keyspace	string
statement	IStatement
return	IEnumerable