hash

Documentation

Index

• Variables
• type Consistent
  • func NewConsistent() *Consistent
  • func (c *Consistent) Add(elt string)
  • func (c *Consistent) Get(name string) (string, error)
  • func (c *Consistent) GetN(name string, n int) ([]string, error)
  • func (c *Consistent) GetTwo(name string) (string, string, error)
  • func (c *Consistent) Members() []string
  • func (c *Consistent) Remove(elt string)
  • func (c *Consistent) Set(elts []string)
• type ConsistentHashNodeRing
  • func NewConsistentHashNodesRing(numberOfReplicas int32, nodes []string) *ConsistentHashNodeRing
  • func (u *ConsistentHashNodeRing) GetNode(pk string) (string, error)
  • func (u *ConsistentHashNodeRing) SetNodes(nodes []string)
  • func (u *ConsistentHashNodeRing) SetNumberOfReplicas(num int32)

Variables

var ErrEmptyCircle = errors.New("empty circle")

ErrEmptyCircle is the error returned when trying to get an element when nothing has been added to hash.

Types

type Consistent

type Consistent struct {
	NumberOfReplicas int

	sync.RWMutex
	// contains filtered or unexported fields
}

Consistent holds the information about the members of the consistent hash circle.

func NewConsistent

func NewConsistent() *Consistent

New creates a new Consistent object with a default setting of 20 replicas for each entry.

To change the number of replicas, set NumberOfReplicas before adding entries.

func (*Consistent) Add

func (c *Consistent) Add(elt string)

Add inserts a string element in the consistent hash.

func (*Consistent) Get

func (c *Consistent) Get(name string) (string, error)

Get returns an element close to where name hashes to in the circle.

func (*Consistent) GetN

func (c *Consistent) GetN(name string, n int) ([]string, error)

GetN returns the N closest distinct elements to the name input in the circle.

func (*Consistent) GetTwo

func (c *Consistent) GetTwo(name string) (string, string, error)

GetTwo returns the two closest distinct elements to the name input in the circle.

func (*Consistent) Members

func (c *Consistent) Members() []string

func (*Consistent) Remove

func (c *Consistent) Remove(elt string)

Remove removes an element from the hash.

func (*Consistent) Set

func (c *Consistent) Set(elts []string)

Set sets all the elements in the hash. If there are existing elements not

type ConsistentHashNodeRing

type ConsistentHashNodeRing struct {
	// contains filtered or unexported fields
}

一致性哈希环,用于管理服务器节点.

func NewConsistentHashNodesRing

func NewConsistentHashNodesRing(numberOfReplicas int32, nodes []string) *ConsistentHashNodeRing

func (*ConsistentHashNodeRing) GetNode

func (u *ConsistentHashNodeRing) GetNode(pk string) (string, error)

根据pk,获取node节点. hash(pk) -> node

func (*ConsistentHashNodeRing) SetNodes

func (u *ConsistentHashNodeRing) SetNodes(nodes []string)

func (*ConsistentHashNodeRing) SetNumberOfReplicas

func (u *ConsistentHashNodeRing) SetNumberOfReplicas(num int32)