membership

package
Version: v3.5.1 Latest Latest
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Published: Oct 3, 2021 License: Apache-2.0 Imports: 26 Imported by: 8

Documentation

Overview

Package membership describes individual etcd members and clusters of members.

Index

Constants

View Source
const (
	ApplyBoth        = ShouldApplyV3(true)
	ApplyV2storeOnly = ShouldApplyV3(false)
)

Variables

View Source
var (
	ErrIDRemoved        = errors.New("membership: ID removed")
	ErrIDExists         = errors.New("membership: ID exists")
	ErrIDNotFound       = errors.New("membership: ID not found")
	ErrPeerURLexists    = errors.New("membership: peerURL exists")
	ErrMemberNotLearner = errors.New("membership: can only promote a learner member")
	ErrTooManyLearners  = errors.New("membership: too many learner members in cluster")
)
View Source
var (
	ClusterVersionMetrics = prometheus.NewGaugeVec(prometheus.GaugeOpts{
		Namespace: "etcd",
		Subsystem: "cluster",
		Name:      "version",
		Help:      "Which version is running. 1 for 'cluster_version' label with current cluster version",
	},
		[]string{"cluster_version"})
)
View Source
var (
	StoreMembersPrefix = path.Join(storePrefix, "members")
)

Functions

func AllowedDowngradeVersion

func AllowedDowngradeVersion(ver *semver.Version) *semver.Version

func IsMetaStoreOnly

func IsMetaStoreOnly(store v2store.Store) (bool, error)

IsMetaStoreOnly verifies if the given `store` contains only a meta-information (members, version) that can be recovered from the backend (storev3) as well as opposed to user-data.

func IsValidVersionChange

func IsValidVersionChange(cv *semver.Version, lv *semver.Version) bool

IsValidVersionChange checks the two scenario when version is valid to change: 1. Downgrade: cluster version is 1 minor version higher than local version, cluster version should change. 2. Cluster start: when not all members version are available, cluster version is set to MinVersion(3.0), when all members are at higher version, cluster version is lower than local version, cluster version should change

func MemberAttributesStorePath

func MemberAttributesStorePath(id types.ID) string

func MemberStoreKey

func MemberStoreKey(id types.ID) string

func MustParseMemberIDFromKey

func MustParseMemberIDFromKey(lg *zap.Logger, key string) types.ID

func MustUnsafeSaveConfStateToBackend

func MustUnsafeSaveConfStateToBackend(lg *zap.Logger, tx backend.BatchTx, confState *raftpb.ConfState)

MustUnsafeSaveConfStateToBackend persists confState using given transaction (tx). confState in backend is persisted since etcd v3.5.

func RemovedMemberStoreKey

func RemovedMemberStoreKey(id types.ID) string

func StoreClusterVersionKey

func StoreClusterVersionKey() string

func TrimClusterFromBackend

func TrimClusterFromBackend(be backend.Backend) error

TrimClusterFromBackend removes all information about cluster (versions) from the v3 backend.

func TrimMembershipFromBackend

func TrimMembershipFromBackend(lg *zap.Logger, be backend.Backend) error

TrimMembershipFromBackend removes all information about members & removed_members from the v3 backend.

func TrimMembershipFromV2Store

func TrimMembershipFromV2Store(lg *zap.Logger, s v2store.Store) error

TrimMembershipFromV2Store removes all information about members & removed_members from the v2 store.

func UnsafeConfStateFromBackend

func UnsafeConfStateFromBackend(lg *zap.Logger, tx backend.ReadTx) *raftpb.ConfState

UnsafeConfStateFromBackend retrieves ConfState from the backend. Returns nil if confState in backend is not persisted (e.g. backend writen by <v3.5).

func ValidateClusterAndAssignIDs

func ValidateClusterAndAssignIDs(lg *zap.Logger, local *RaftCluster, existing *RaftCluster) error

ValidateClusterAndAssignIDs validates the local cluster by matching the PeerURLs with the existing cluster. If the validation succeeds, it assigns the IDs from the existing cluster to the local cluster. If the validation fails, an error will be returned.

Types

type Attributes

type Attributes struct {
	Name       string   `json:"name,omitempty"`
	ClientURLs []string `json:"clientURLs,omitempty"`
}

Attributes represents all the non-raft related attributes of an etcd member.

type ConfigChangeContext

type ConfigChangeContext struct {
	Member
	// IsPromote indicates if the config change is for promoting a learner member.
	// This flag is needed because both adding a new member and promoting a learner member
	// uses the same config change type 'ConfChangeAddNode'.
	IsPromote bool `json:"isPromote"`
}

ConfigChangeContext represents a context for confChange.

type DowngradeInfo

type DowngradeInfo struct {
	// TargetVersion is the target downgrade version, if the cluster is not under downgrading,
	// the targetVersion will be an empty string
	TargetVersion string `json:"target-version"`
	// Enabled indicates whether the cluster is enabled to downgrade
	Enabled bool `json:"enabled"`
}

func (*DowngradeInfo) GetTargetVersion

func (d *DowngradeInfo) GetTargetVersion() *semver.Version

type Member

type Member struct {
	ID types.ID `json:"id"`
	RaftAttributes
	Attributes
}

func NewMember

func NewMember(name string, peerURLs types.URLs, clusterName string, now *time.Time) *Member

NewMember creates a Member without an ID and generates one based on the cluster name, peer URLs, and time. This is used for bootstrapping/adding new member.

func NewMemberAsLearner

func NewMemberAsLearner(name string, peerURLs types.URLs, clusterName string, now *time.Time) *Member

NewMemberAsLearner creates a learner Member without an ID and generates one based on the cluster name, peer URLs, and time. This is used for adding new learner member.

func (*Member) Clone

func (m *Member) Clone() *Member

func (*Member) IsStarted

func (m *Member) IsStarted() bool

func (*Member) PickPeerURL

func (m *Member) PickPeerURL() string

PickPeerURL chooses a random address from a given Member's PeerURLs. It will panic if there is no PeerURLs available in Member.

type MembersByID

type MembersByID []*Member

MembersByID implements sort by ID interface

func (MembersByID) Len

func (ms MembersByID) Len() int

func (MembersByID) Less

func (ms MembersByID) Less(i, j int) bool

func (MembersByID) Swap

func (ms MembersByID) Swap(i, j int)

type MembersByPeerURLs

type MembersByPeerURLs []*Member

MembersByPeerURLs implements sort by peer urls interface

func (MembersByPeerURLs) Len

func (ms MembersByPeerURLs) Len() int

func (MembersByPeerURLs) Less

func (ms MembersByPeerURLs) Less(i, j int) bool

func (MembersByPeerURLs) Swap

func (ms MembersByPeerURLs) Swap(i, j int)

type RaftAttributes

type RaftAttributes struct {
	// PeerURLs is the list of peers in the raft cluster.
	// TODO(philips): ensure these are URLs
	PeerURLs []string `json:"peerURLs"`
	// IsLearner indicates if the member is raft learner.
	IsLearner bool `json:"isLearner,omitempty"`
}

RaftAttributes represents the raft related attributes of an etcd member.

type RaftCluster

type RaftCluster struct {
	sync.Mutex // guards the fields below
	// contains filtered or unexported fields
}

RaftCluster is a list of Members that belong to the same raft cluster

func NewCluster

func NewCluster(lg *zap.Logger) *RaftCluster

func NewClusterFromMembers

func NewClusterFromMembers(lg *zap.Logger, id types.ID, membs []*Member) *RaftCluster

func NewClusterFromURLsMap

func NewClusterFromURLsMap(lg *zap.Logger, token string, urlsmap types.URLsMap) (*RaftCluster, error)

NewClusterFromURLsMap creates a new raft cluster using provided urls map. Currently, it does not support creating cluster with raft learner member.

func (*RaftCluster) AddMember

func (c *RaftCluster) AddMember(m *Member, shouldApplyV3 ShouldApplyV3)

AddMember adds a new Member into the cluster, and saves the given member's raftAttributes into the store. The given member should have empty attributes. A Member with a matching id must not exist.

func (*RaftCluster) ClientURLs

func (c *RaftCluster) ClientURLs() []string

ClientURLs returns a list of all client addresses. The returned list is sorted in ascending lexicographical order.

func (*RaftCluster) DowngradeInfo

func (c *RaftCluster) DowngradeInfo() *DowngradeInfo

DowngradeInfo returns the downgrade status of the cluster

func (*RaftCluster) ID

func (c *RaftCluster) ID() types.ID

func (*RaftCluster) IsIDRemoved

func (c *RaftCluster) IsIDRemoved(id types.ID) bool

func (*RaftCluster) IsLocalMemberLearner

func (c *RaftCluster) IsLocalMemberLearner() bool

IsLocalMemberLearner returns if the local member is raft learner

func (*RaftCluster) IsMemberExist

func (c *RaftCluster) IsMemberExist(id types.ID) bool

IsMemberExist returns if the member with the given id exists in cluster.

func (*RaftCluster) IsReadyToAddVotingMember

func (c *RaftCluster) IsReadyToAddVotingMember() bool

func (*RaftCluster) IsReadyToPromoteMember

func (c *RaftCluster) IsReadyToPromoteMember(id uint64) bool

func (*RaftCluster) IsReadyToRemoveVotingMember

func (c *RaftCluster) IsReadyToRemoveVotingMember(id uint64) bool

func (*RaftCluster) Member

func (c *RaftCluster) Member(id types.ID) *Member

func (*RaftCluster) MemberByName

func (c *RaftCluster) MemberByName(name string) *Member

MemberByName returns a Member with the given name if exists. If more than one member has the given name, it will panic.

func (*RaftCluster) MemberIDs

func (c *RaftCluster) MemberIDs() []types.ID

func (*RaftCluster) Members

func (c *RaftCluster) Members() []*Member

func (*RaftCluster) PeerURLs

func (c *RaftCluster) PeerURLs() []string

PeerURLs returns a list of all peer addresses. The returned list is sorted in ascending lexicographical order.

func (*RaftCluster) PromoteMember

func (c *RaftCluster) PromoteMember(id types.ID, shouldApplyV3 ShouldApplyV3)

PromoteMember marks the member's IsLearner RaftAttributes to false.

func (*RaftCluster) PushMembershipToStorage

func (c *RaftCluster) PushMembershipToStorage()

PushMembershipToStorage is overriding storage information about cluster's members, such that they fully reflect internal RaftCluster's storage.

func (*RaftCluster) Recover

func (c *RaftCluster) Recover(onSet func(*zap.Logger, *semver.Version))

func (*RaftCluster) RemoveMember

func (c *RaftCluster) RemoveMember(id types.ID, shouldApplyV3 ShouldApplyV3)

RemoveMember removes a member from the store. The given id MUST exist, or the function panics.

func (*RaftCluster) SetBackend

func (c *RaftCluster) SetBackend(be backend.Backend)

func (*RaftCluster) SetDowngradeInfo

func (c *RaftCluster) SetDowngradeInfo(d *DowngradeInfo, shouldApplyV3 ShouldApplyV3)

func (*RaftCluster) SetID

func (c *RaftCluster) SetID(localID, cid types.ID)

func (*RaftCluster) SetStore

func (c *RaftCluster) SetStore(st v2store.Store)

func (*RaftCluster) SetVersion

func (c *RaftCluster) SetVersion(ver *semver.Version, onSet func(*zap.Logger, *semver.Version), shouldApplyV3 ShouldApplyV3)

func (*RaftCluster) String

func (c *RaftCluster) String() string

func (*RaftCluster) UpdateAttributes

func (c *RaftCluster) UpdateAttributes(id types.ID, attr Attributes, shouldApplyV3 ShouldApplyV3)

func (*RaftCluster) UpdateRaftAttributes

func (c *RaftCluster) UpdateRaftAttributes(id types.ID, raftAttr RaftAttributes, shouldApplyV3 ShouldApplyV3)

func (*RaftCluster) ValidateConfigurationChange

func (c *RaftCluster) ValidateConfigurationChange(cc raftpb.ConfChange) error

ValidateConfigurationChange takes a proposed ConfChange and ensures that it is still valid.

func (*RaftCluster) Version

func (c *RaftCluster) Version() *semver.Version

func (*RaftCluster) VotingMemberIDs

func (c *RaftCluster) VotingMemberIDs() []types.ID

VotingMemberIDs returns the ID of voting members in cluster.

func (*RaftCluster) VotingMembers

func (c *RaftCluster) VotingMembers() []*Member

type ShouldApplyV3

type ShouldApplyV3 bool

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