LegacyDefaultLoadBalancingPolicy

LegacyDefaultLoadBalancingPolicy¶

policies/loadBalancing~LegacyDefaultLoadBalancingPolicy(optionsopt)

A load-balancing policy implementation that attempts to fairly distribute the load based on the amount of in-flight request per hosts. The local replicas are initially shuffled and between the first two nodes in the shuffled list, the one with fewer in-flight requests is selected as coordinator.

Additionally, it detects unresponsive replicas and reorders them at the back of the query plan.

For graph analytics queries, it uses the preferred analytics graph server previously obtained by driver as first host in the query plan.

Creates a new instance of LegacyDefaultLoadBalancingPolicy.

Name Type Attributes Description

options

String | Object

The local data center name or the optional policy options object.

Note that when providing the local data center name, it overrides localDataCenter option at Client level.

Name	Type	Attributes	Description
`localDc`	String	<optional>	local data center name. This value overrides the 'localDataCenter' Client option and is useful for cases where you have multiple execution profiles that you intend on using for routing requests to different data centers.
`filter`	function	<optional>	A function to apply to determine if hosts are included in the query plan. The function takes a Host parameter and returns a Boolean.