Class DefaultLoadBalancingPolicy

A load balancing policy designed to run against both DSE and Apache Cassandra clusters.

For most workloads, the query plan will be determined in a similar way to TokenAwarePolicy(DCAwareRoundRobinPolicy).

For graph analytics queries, this policy sets the preferred analytics graph server previously obtained by driver as the first host in the query plan. After this host, the query plan is the same as the one returned for other workloads.

Inheritance
object
DefaultLoadBalancingPolicy
Implements
Inherited Members
object.Equals(object)
object.Equals(object, object)
object.GetHashCode()
object.GetType()
object.MemberwiseClone()
object.ReferenceEquals(object, object)
object.ToString()
Namespace: Cassandra
Assembly: Cassandra.dll
Syntax
public class DefaultLoadBalancingPolicy : ILoadBalancingPolicy

Constructors

DefaultLoadBalancingPolicy(string)

Creates a new datacenter aware round robin policy given the name of the local datacenter.

The name of the local datacenter provided must be the local datacenter name as known by the server.

The policy created will ignore all remote hosts.

Declaration
public DefaultLoadBalancingPolicy(string localDc)
Parameters
Type Name Description
string localDc

the name of the local datacenter (as known by Cassandra).

Methods

Distance(Host)

Return the HostDistance for the provided host. This policy consider nodes in the local datacenter as Local and the rest is Ignored.

Declaration
public HostDistance Distance(Host host)
Parameters
Type Name Description
Host host

the host of which to return the distance of.
Returns
Type Description
HostDistance

the HostDistance to host.

Initialize(ICluster)

Initializes the policy.

Declaration
public void Initialize(ICluster cluster)
Parameters
Type Name Description
ICluster cluster

NewQueryPlan(string, IStatement)

Returns the hosts to used for a query.

Declaration
public IEnumerable<Host> NewQueryPlan(string keyspace, IStatement statement)
Parameters
Type Name Description
string keyspace
IStatement statement
Returns
Type Description
IEnumerable<Host>

Implements