ewma

Documentation

Index

• type Builder
  • func (b *Builder) Build(n selector.Node) selector.WeightedNode
• type Node
  • func (n *Node) Pick() selector.DoneFunc
  • func (n *Node) PickElapsed() time.Duration
  • func (n *Node) Raw() selector.Node
  • func (n *Node) Weight() (weight float64)

Types

type Builder

type Builder struct {
	ErrHandler func(err error) (isErr bool)
}

Builder is ewma node builder.

func (*Builder) Build

func (b *Builder) Build(n selector.Node) selector.WeightedNode

Build create a weighted node.

type Node

type Node struct {
	selector.Node
	// contains filtered or unexported fields
}

Node is endpoint instance ewma -> Exponentially Weighted Averages 指数移动加权平均，体现的是一段时间内的平均值 ewma node is a weighted node, it will collect statistic data and calculate a weight. 配合ewma算法，实现 p2c 负载均衡算法

func (*Node) Pick

func (n *Node) Pick() selector.DoneFunc

Pick pick a node.

func (*Node) PickElapsed

func (n *Node) PickElapsed() time.Duration

func (*Node) Raw

func (n *Node) Raw() selector.Node

func (*Node) Weight

func (n *Node) Weight() (weight float64)

Weight is node effective weight.