etcdserver

package
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 Go to latest Published: Jul 13, 2017 License: Apache-2.0 Imports: 57 Imported by: 145

Documentation

Overview

Package etcdserver defines how etcd servers interact and store their states.

Index

Constants

View Source 
const (
	// DefaultQuotaBytes is the number of bytes the backend Size may
	// consume before exceeding the space quota.
	DefaultQuotaBytes = int64(2 * 1024 * 1024 * 1024) // 2GB
	// MaxQuotaBytes is the maximum number of bytes suggested for a backend
	// quota. A larger quota may lead to degraded performance.
	MaxQuotaBytes = int64(8 * 1024 * 1024 * 1024) // 8GB
)
View Source 
const (
	DefaultSnapCount = 100000

	StoreClusterPrefix = "/0"
	StoreKeysPrefix    = "/1"

	// HealthInterval is the minimum time the cluster should be healthy
	// before accepting add member requests.
	HealthInterval = 5 * time.Second
)

Variables

View Source 
var (
	ErrUnknownMethod              = errors.New("etcdserver: unknown method")
	ErrStopped                    = errors.New("etcdserver: server stopped")
	ErrCanceled                   = errors.New("etcdserver: request cancelled")
	ErrTimeout                    = errors.New("etcdserver: request timed out")
	ErrTimeoutDueToLeaderFail     = errors.New("etcdserver: request timed out, possibly due to previous leader failure")
	ErrTimeoutDueToConnectionLost = errors.New("etcdserver: request timed out, possibly due to connection lost")
	ErrTimeoutLeaderTransfer      = errors.New("etcdserver: request timed out, leader transfer took too long")
	ErrNotEnoughStartedMembers    = errors.New("etcdserver: re-configuration failed due to not enough started members")
	ErrNoLeader                   = errors.New("etcdserver: no leader")
	ErrRequestTooLarge            = errors.New("etcdserver: request is too large")
	ErrNoSpace                    = errors.New("etcdserver: no space")
	ErrTooManyRequests            = errors.New("etcdserver: too many requests")
	ErrUnhealthy                  = errors.New("etcdserver: unhealthy cluster")
	ErrKeyNotFound                = errors.New("etcdserver: key not found")
)

Functions

func GetClusterFromRemotePeers 

func GetClusterFromRemotePeers(urls []string, rt http.RoundTripper) (*membership.RaftCluster, error)

GetClusterFromRemotePeers takes a set of URLs representing etcd peers, and attempts to construct a Cluster by accessing the members endpoint on one of these URLs. The first URL to provide a response is used. If no URLs provide a response, or a Cluster cannot be successfully created from a received response, an error is returned. Each request has a 10-second timeout. Because the upper limit of TTL is 5s, 10 second is enough for building connection and finishing request.

Types

type ApplierV2 

type ApplierV2 interface {
	Delete(r *pb.Request) Response
	Post(r *pb.Request) Response
	Put(r *pb.Request) Response
	QGet(r *pb.Request) Response
	Sync(r *pb.Request) Response
}

ApplierV2 is the interface for processing V2 raft messages

func NewApplierV2 

func NewApplierV2(s store.Store, c *membership.RaftCluster) ApplierV2

type Authenticator 

type Authenticator interface {
	AuthEnable(ctx context.Context, r *pb.AuthEnableRequest) (*pb.AuthEnableResponse, error)
	AuthDisable(ctx context.Context, r *pb.AuthDisableRequest) (*pb.AuthDisableResponse, error)
	Authenticate(ctx context.Context, r *pb.AuthenticateRequest) (*pb.AuthenticateResponse, error)
	UserAdd(ctx context.Context, r *pb.AuthUserAddRequest) (*pb.AuthUserAddResponse, error)
	UserDelete(ctx context.Context, r *pb.AuthUserDeleteRequest) (*pb.AuthUserDeleteResponse, error)
	UserChangePassword(ctx context.Context, r *pb.AuthUserChangePasswordRequest) (*pb.AuthUserChangePasswordResponse, error)
	UserGrantRole(ctx context.Context, r *pb.AuthUserGrantRoleRequest) (*pb.AuthUserGrantRoleResponse, error)
	UserGet(ctx context.Context, r *pb.AuthUserGetRequest) (*pb.AuthUserGetResponse, error)
	UserRevokeRole(ctx context.Context, r *pb.AuthUserRevokeRoleRequest) (*pb.AuthUserRevokeRoleResponse, error)
	RoleAdd(ctx context.Context, r *pb.AuthRoleAddRequest) (*pb.AuthRoleAddResponse, error)
	RoleGrantPermission(ctx context.Context, r *pb.AuthRoleGrantPermissionRequest) (*pb.AuthRoleGrantPermissionResponse, error)
	RoleGet(ctx context.Context, r *pb.AuthRoleGetRequest) (*pb.AuthRoleGetResponse, error)
	RoleRevokePermission(ctx context.Context, r *pb.AuthRoleRevokePermissionRequest) (*pb.AuthRoleRevokePermissionResponse, error)
	RoleDelete(ctx context.Context, r *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error)
	UserList(ctx context.Context, r *pb.AuthUserListRequest) (*pb.AuthUserListResponse, error)
	RoleList(ctx context.Context, r *pb.AuthRoleListRequest) (*pb.AuthRoleListResponse, error)
}

type DiscoveryError 

type DiscoveryError struct {
	Op  string
	Err error
}

func (DiscoveryError) Error 

func (e DiscoveryError) Error() string

type EtcdServer 

type EtcdServer struct {
	Cfg *ServerConfig

	SyncTicker *time.Ticker
	// contains filtered or unexported fields
}

EtcdServer is the production implementation of the Server interface

func NewServer 

func NewServer(cfg *ServerConfig) (srv *EtcdServer, err error)

NewServer creates a new EtcdServer from the supplied configuration. The configuration is considered static for the lifetime of the EtcdServer.

func (*EtcdServer) AddMember 

func (s *EtcdServer) AddMember(ctx context.Context, memb membership.Member) ([]*membership.Member, error)

func (*EtcdServer) Alarm 

func (s *EtcdServer) Alarm(ctx context.Context, r *pb.AlarmRequest) (*pb.AlarmResponse, error)

func (*EtcdServer) ApplyWait 

func (s *EtcdServer) ApplyWait() <-chan struct{}

func (*EtcdServer) AuthDisable 

func (s *EtcdServer) AuthDisable(ctx context.Context, r *pb.AuthDisableRequest) (*pb.AuthDisableResponse, error)

func (*EtcdServer) AuthEnable 

func (s *EtcdServer) AuthEnable(ctx context.Context, r *pb.AuthEnableRequest) (*pb.AuthEnableResponse, error)

func (*EtcdServer) AuthInfoFromCtx 

func (s *EtcdServer) AuthInfoFromCtx(ctx context.Context) (*auth.AuthInfo, error)

func (*EtcdServer) AuthStore 

func (s *EtcdServer) AuthStore() auth.AuthStore

func (*EtcdServer) Authenticate 

func (s *EtcdServer) Authenticate(ctx context.Context, r *pb.AuthenticateRequest) (*pb.AuthenticateResponse, error)

func (*EtcdServer) Backend 

func (s *EtcdServer) Backend() backend.Backend

func (*EtcdServer) Cluster 

func (s *EtcdServer) Cluster() *membership.RaftCluster

func (*EtcdServer) ClusterVersion 

func (s *EtcdServer) ClusterVersion() *semver.Version

func (*EtcdServer) Compact 

func (s *EtcdServer) Compact(ctx context.Context, r *pb.CompactionRequest) (*pb.CompactionResponse, error)

func (*EtcdServer) CutPeer 

func (s *EtcdServer) CutPeer(id types.ID)

CutPeer drops messages to the specified peer.

func (*EtcdServer) DeleteRange 

func (s *EtcdServer) DeleteRange(ctx context.Context, r *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, error)

func (*EtcdServer) Do 

func (s *EtcdServer) Do(ctx context.Context, r pb.Request) (Response, error)

Do interprets r and performs an operation on s.store according to r.Method and other fields. If r.Method is "POST", "PUT", "DELETE", or a "GET" with Quorum == true, r will be sent through consensus before performing its respective operation. Do will block until an action is performed or there is an error.

func (*EtcdServer) HardStop 

func (s *EtcdServer) HardStop()

HardStop stops the server without coordination with other members in the cluster.

func (*EtcdServer) ID 

func (s *EtcdServer) ID() types.ID

func (*EtcdServer) Index 

func (s *EtcdServer) Index() uint64

func (*EtcdServer) IsIDRemoved 

func (s *EtcdServer) IsIDRemoved(id uint64) bool

func (*EtcdServer) KV 

func (s *EtcdServer) KV() mvcc.ConsistentWatchableKV

func (*EtcdServer) Lead 

func (s *EtcdServer) Lead() uint64

Lead is only for testing purposes. TODO: add Raft server interface to expose raft related info: Index, Term, Lead, Committed, Applied, LastIndex, etc.

func (*EtcdServer) Leader 

func (s *EtcdServer) Leader() types.ID

func (*EtcdServer) LeaderStats 

func (s *EtcdServer) LeaderStats() []byte

func (*EtcdServer) LeaseGrant 

func (s *EtcdServer) LeaseGrant(ctx context.Context, r *pb.LeaseGrantRequest) (*pb.LeaseGrantResponse, error)

func (*EtcdServer) LeaseRenew 

func (s *EtcdServer) LeaseRenew(ctx context.Context, id lease.LeaseID) (int64, error)

func (*EtcdServer) LeaseRevoke 

func (s *EtcdServer) LeaseRevoke(ctx context.Context, r *pb.LeaseRevokeRequest) (*pb.LeaseRevokeResponse, error)

func (*EtcdServer) LeaseTimeToLive 

func (s *EtcdServer) LeaseTimeToLive(ctx context.Context, r *pb.LeaseTimeToLiveRequest) (*pb.LeaseTimeToLiveResponse, error)

func (*EtcdServer) Lessor 

func (s *EtcdServer) Lessor() lease.Lessor

func (*EtcdServer) MendPeer 

func (s *EtcdServer) MendPeer(id types.ID)

MendPeer recovers the message dropping behavior of the given peer.

func (*EtcdServer) PauseSending 

func (s *EtcdServer) PauseSending()

func (*EtcdServer) Process 

func (s *EtcdServer) Process(ctx context.Context, m raftpb.Message) error

func (*EtcdServer) Put 

func (s *EtcdServer) Put(ctx context.Context, r *pb.PutRequest) (*pb.PutResponse, error)

func (*EtcdServer) RaftHandler 

func (s *EtcdServer) RaftHandler() http.Handler

func (*EtcdServer) Range 

func (s *EtcdServer) Range(ctx context.Context, r *pb.RangeRequest) (*pb.RangeResponse, error)

func (*EtcdServer) ReadyNotify 

func (s *EtcdServer) ReadyNotify() <-chan struct{}

ReadyNotify returns a channel that will be closed when the server is ready to serve client requests

func (*EtcdServer) RemoveMember 

func (s *EtcdServer) RemoveMember(ctx context.Context, id uint64) ([]*membership.Member, error)

func (*EtcdServer) ReportSnapshot 

func (s *EtcdServer) ReportSnapshot(id uint64, status raft.SnapshotStatus)

ReportSnapshot reports snapshot sent status to the raft state machine, and clears the used snapshot from the snapshot store.

func (*EtcdServer) ReportUnreachable 

func (s *EtcdServer) ReportUnreachable(id uint64)

func (*EtcdServer) ResumeSending 

func (s *EtcdServer) ResumeSending()

func (*EtcdServer) RoleAdd 

func (s *EtcdServer) RoleAdd(ctx context.Context, r *pb.AuthRoleAddRequest) (*pb.AuthRoleAddResponse, error)

func (*EtcdServer) RoleDelete 

func (s *EtcdServer) RoleDelete(ctx context.Context, r *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error)

func (*EtcdServer) RoleGet 

func (s *EtcdServer) RoleGet(ctx context.Context, r *pb.AuthRoleGetRequest) (*pb.AuthRoleGetResponse, error)

func (*EtcdServer) RoleGrantPermission 

func (s *EtcdServer) RoleGrantPermission(ctx context.Context, r *pb.AuthRoleGrantPermissionRequest) (*pb.AuthRoleGrantPermissionResponse, error)

func (*EtcdServer) RoleList 

func (s *EtcdServer) RoleList(ctx context.Context, r *pb.AuthRoleListRequest) (*pb.AuthRoleListResponse, error)

func (*EtcdServer) RoleRevokePermission 

func (s *EtcdServer) RoleRevokePermission(ctx context.Context, r *pb.AuthRoleRevokePermissionRequest) (*pb.AuthRoleRevokePermissionResponse, error)

func (*EtcdServer) SelfStats 

func (s *EtcdServer) SelfStats() []byte

func (*EtcdServer) Start 

func (s *EtcdServer) Start()

Start prepares and starts server in a new goroutine. It is no longer safe to modify a server's fields after it has been sent to Start. It also starts a goroutine to publish its server information.

func (*EtcdServer) Stop 

func (s *EtcdServer) Stop()

Stop stops the server gracefully, and shuts down the running goroutine. Stop should be called after a Start(s), otherwise it will block forever. When stopping leader, Stop transfers its leadership to one of its peers before stopping the server.

func (*EtcdServer) StopNotify 

func (s *EtcdServer) StopNotify() <-chan struct{}

StopNotify returns a channel that receives a empty struct when the server is stopped.

func (*EtcdServer) StoreStats 

func (s *EtcdServer) StoreStats() []byte

func (*EtcdServer) Term 

func (s *EtcdServer) Term() uint64

func (*EtcdServer) TransferLeadership 

func (s *EtcdServer) TransferLeadership() error

TransferLeadership transfers the leader to the chosen transferee.

func (*EtcdServer) Txn 

func (s *EtcdServer) Txn(ctx context.Context, r *pb.TxnRequest) (*pb.TxnResponse, error)

func (*EtcdServer) UpdateMember 

func (s *EtcdServer) UpdateMember(ctx context.Context, memb membership.Member) ([]*membership.Member, error)

func (*EtcdServer) UserAdd 

func (s *EtcdServer) UserAdd(ctx context.Context, r *pb.AuthUserAddRequest) (*pb.AuthUserAddResponse, error)

func (*EtcdServer) UserChangePassword 

func (s *EtcdServer) UserChangePassword(ctx context.Context, r *pb.AuthUserChangePasswordRequest) (*pb.AuthUserChangePasswordResponse, error)

func (*EtcdServer) UserDelete 

func (s *EtcdServer) UserDelete(ctx context.Context, r *pb.AuthUserDeleteRequest) (*pb.AuthUserDeleteResponse, error)

func (*EtcdServer) UserGet 

func (s *EtcdServer) UserGet(ctx context.Context, r *pb.AuthUserGetRequest) (*pb.AuthUserGetResponse, error)

func (*EtcdServer) UserGrantRole 

func (s *EtcdServer) UserGrantRole(ctx context.Context, r *pb.AuthUserGrantRoleRequest) (*pb.AuthUserGrantRoleResponse, error)

func (*EtcdServer) UserList 

func (s *EtcdServer) UserList(ctx context.Context, r *pb.AuthUserListRequest) (*pb.AuthUserListResponse, error)

func (*EtcdServer) UserRevokeRole 

func (s *EtcdServer) UserRevokeRole(ctx context.Context, r *pb.AuthUserRevokeRoleRequest) (*pb.AuthUserRevokeRoleResponse, error)

func (*EtcdServer) Watchable 

func (s *EtcdServer) Watchable() mvcc.WatchableKV

Watchable returns a watchable interface attached to the etcdserver.

type Lessor 

type Lessor interface {
	// LeaseGrant sends LeaseGrant request to raft and apply it after committed.
	LeaseGrant(ctx context.Context, r *pb.LeaseGrantRequest) (*pb.LeaseGrantResponse, error)
	// LeaseRevoke sends LeaseRevoke request to raft and apply it after committed.
	LeaseRevoke(ctx context.Context, r *pb.LeaseRevokeRequest) (*pb.LeaseRevokeResponse, error)

	// LeaseRenew renews the lease with given ID. The renewed TTL is returned. Or an error
	// is returned.
	LeaseRenew(ctx context.Context, id lease.LeaseID) (int64, error)

	// LeaseTimeToLive retrieves lease information.
	LeaseTimeToLive(ctx context.Context, r *pb.LeaseTimeToLiveRequest) (*pb.LeaseTimeToLiveResponse, error)
}

type Quota 

type Quota interface {
	// Available judges whether the given request fits within the quota.
	Available(req interface{}) bool
	// Cost computes the charge against the quota for a given request.
	Cost(req interface{}) int
	// Remaining is the amount of charge left for the quota.
	Remaining() int64
}

Quota represents an arbitrary quota against arbitrary requests. Each request costs some charge; if there is not enough remaining charge, then there are too few resources available within the quota to apply the request.

func NewBackendQuota 

func NewBackendQuota(s *EtcdServer) Quota

type RaftKV 

type RaftKV interface {
	Range(ctx context.Context, r *pb.RangeRequest) (*pb.RangeResponse, error)
	Put(ctx context.Context, r *pb.PutRequest) (*pb.PutResponse, error)
	DeleteRange(ctx context.Context, r *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, error)
	Txn(ctx context.Context, r *pb.TxnRequest) (*pb.TxnResponse, error)
	Compact(ctx context.Context, r *pb.CompactionRequest) (*pb.CompactionResponse, error)
}

type RaftTimer 

type RaftTimer interface {
	Index() uint64
	Term() uint64
}

type Response 

type Response struct {
	Event   *store.Event
	Watcher store.Watcher
	// contains filtered or unexported fields
}

type Server 

type Server interface {
	// Start performs any initialization of the Server necessary for it to
	// begin serving requests. It must be called before Do or Process.
	// Start must be non-blocking; any long-running server functionality
	// should be implemented in goroutines.
	Start()
	// Stop terminates the Server and performs any necessary finalization.
	// Do and Process cannot be called after Stop has been invoked.
	Stop()
	// ID returns the ID of the Server.
	ID() types.ID
	// Leader returns the ID of the leader Server.
	Leader() types.ID
	// Do takes a request and attempts to fulfill it, returning a Response.
	Do(ctx context.Context, r pb.Request) (Response, error)
	// Process takes a raft message and applies it to the server's raft state
	// machine, respecting any timeout of the given context.
	Process(ctx context.Context, m raftpb.Message) error
	// AddMember attempts to add a member into the cluster. It will return
	// ErrIDRemoved if member ID is removed from the cluster, or return
	// ErrIDExists if member ID exists in the cluster.
	AddMember(ctx context.Context, memb membership.Member) ([]*membership.Member, error)
	// RemoveMember attempts to remove a member from the cluster. It will
	// return ErrIDRemoved if member ID is removed from the cluster, or return
	// ErrIDNotFound if member ID is not in the cluster.
	RemoveMember(ctx context.Context, id uint64) ([]*membership.Member, error)

	// UpdateMember attempts to update an existing member in the cluster. It will
	// return ErrIDNotFound if the member ID does not exist.
	UpdateMember(ctx context.Context, updateMemb membership.Member) ([]*membership.Member, error)

	// ClusterVersion is the cluster-wide minimum major.minor version.
	// Cluster version is set to the min version that an etcd member is
	// compatible with when first bootstrap.
	//
	// ClusterVersion is nil until the cluster is bootstrapped (has a quorum).
	//
	// During a rolling upgrades, the ClusterVersion will be updated
	// automatically after a sync. (5 second by default)
	//
	// The API/raft component can utilize ClusterVersion to determine if
	// it can accept a client request or a raft RPC.
	// NOTE: ClusterVersion might be nil when etcd 2.1 works with etcd 2.0 and
	// the leader is etcd 2.0. etcd 2.0 leader will not update clusterVersion since
	// this feature is introduced post 2.0.
	ClusterVersion() *semver.Version
}

type ServerConfig 

type ServerConfig struct {
	Name           string
	DiscoveryURL   string
	DiscoveryProxy string
	ClientURLs     types.URLs
	PeerURLs       types.URLs
	DataDir        string
	// DedicatedWALDir config will make the etcd to write the WAL to the WALDir
	// rather than the dataDir/member/wal.
	DedicatedWALDir     string
	SnapCount           uint64
	MaxSnapFiles        uint
	MaxWALFiles         uint
	InitialPeerURLsMap  types.URLsMap
	InitialClusterToken string
	NewCluster          bool
	ForceNewCluster     bool
	PeerTLSInfo         transport.TLSInfo

	TickMs           uint
	ElectionTicks    int
	BootstrapTimeout time.Duration

	AutoCompactionRetention int
	QuotaBackendBytes       int64

	StrictReconfigCheck bool

	// ClientCertAuthEnabled is true when cert has been signed by the client CA.
	ClientCertAuthEnabled bool

	AuthToken string
}

ServerConfig holds the configuration of etcd as taken from the command line or discovery.

func (*ServerConfig) MemberDir 

func (c *ServerConfig) MemberDir() string

func (*ServerConfig) Print 

func (c *ServerConfig) Print()

func (*ServerConfig) PrintWithInitial 

func (c *ServerConfig) PrintWithInitial()

func (*ServerConfig) ReqTimeout 

func (c *ServerConfig) ReqTimeout() time.Duration

ReqTimeout returns timeout for request to finish.

func (*ServerConfig) ShouldDiscover 

func (c *ServerConfig) ShouldDiscover() bool

func (*ServerConfig) SnapDir 

func (c *ServerConfig) SnapDir() string

func (*ServerConfig) VerifyBootstrap 

func (c *ServerConfig) VerifyBootstrap() error

VerifyBootstrap sanity-checks the initial config for bootstrap case and returns an error for things that should never happen.

func (*ServerConfig) VerifyJoinExisting 

func (c *ServerConfig) VerifyJoinExisting() error

VerifyJoinExisting sanity-checks the initial config for join existing cluster case and returns an error for things that should never happen.

func (*ServerConfig) WALDir 

func (c *ServerConfig) WALDir() string

type Storage 

type Storage interface {
	// Save function saves ents and state to the underlying stable storage.
	// Save MUST block until st and ents are on stable storage.
	Save(st raftpb.HardState, ents []raftpb.Entry) error
	// SaveSnap function saves snapshot to the underlying stable storage.
	SaveSnap(snap raftpb.Snapshot) error
	// Close closes the Storage and performs finalization.
	Close() error
}

func NewStorage 

func NewStorage(w *wal.WAL, s *snap.Snapshotter) Storage

Source Files

View all Source files

Directories

Path Synopsis
api
Package api manages the capabilities and features that are exposed to clients by the etcd cluster.
 Package api manages the capabilities and features that are exposed to clients by the etcd cluster.
v2http
Package v2http provides etcd client and server implementations.
 Package v2http provides etcd client and server implementations.
v2http/httptypes
Package httptypes defines how etcd's HTTP API entities are serialized to and deserialized from JSON.
 Package httptypes defines how etcd's HTTP API entities are serialized to and deserialized from JSON.
v3client
Package v3client provides clientv3 interfaces from an etcdserver.
 Package v3client provides clientv3 interfaces from an etcdserver.
v3election
Package v3election provides a v3 election service from an etcdserver.
 Package v3election provides a v3 election service from an etcdserver.
v3election/v3electionpb
Package v3electionpb is a generated protocol buffer package.
 Package v3electionpb is a generated protocol buffer package.
v3election/v3electionpb/gw
Package v3electionpb is a reverse proxy.
 Package v3electionpb is a reverse proxy.
v3lock
Package v3lock provides a v3 locking service from an etcdserver.
 Package v3lock provides a v3 locking service from an etcdserver.
v3lock/v3lockpb
Package v3lockpb is a generated protocol buffer package.
 Package v3lockpb is a generated protocol buffer package.
v3lock/v3lockpb/gw
Package v3lockpb is a reverse proxy.
 Package v3lockpb is a reverse proxy.
v3rpc
Package v3rpc implements etcd v3 RPC system based on gRPC.
 Package v3rpc implements etcd v3 RPC system based on gRPC.
v3rpc/rpctypes
Package rpctypes has types and values shared by the etcd server and client for v3 RPC interaction.
 Package rpctypes has types and values shared by the etcd server and client for v3 RPC interaction.
Package auth implements etcd authentication.
 Package auth implements etcd authentication.
Package etcdserverpb is a generated protocol buffer package.
 Package etcdserverpb is a generated protocol buffer package.
gw
Package etcdserverpb is a reverse proxy.
 Package etcdserverpb is a reverse proxy.
Package membership describes individual etcd members and clusters of members.
 Package membership describes individual etcd members and clusters of members.
Package stats defines a standard interface for etcd cluster statistics.
 Package stats defines a standard interface for etcd cluster statistics.

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