mirror of https://github.com/k3s-io/k3s
842 lines
22 KiB
Go
842 lines
22 KiB
Go
// Copyright 2015 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package membership
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import (
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"bytes"
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"context"
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"crypto/sha1"
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"encoding/binary"
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"encoding/json"
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"fmt"
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"path"
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"sort"
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"strings"
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"sync"
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"time"
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"go.etcd.io/etcd/etcdserver/api/v2store"
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"go.etcd.io/etcd/mvcc/backend"
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"go.etcd.io/etcd/pkg/netutil"
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"go.etcd.io/etcd/pkg/types"
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"go.etcd.io/etcd/raft"
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"go.etcd.io/etcd/raft/raftpb"
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"go.etcd.io/etcd/version"
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"github.com/coreos/go-semver/semver"
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"github.com/prometheus/client_golang/prometheus"
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"go.uber.org/zap"
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)
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const maxLearners = 1
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// RaftCluster is a list of Members that belong to the same raft cluster
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type RaftCluster struct {
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lg *zap.Logger
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localID types.ID
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cid types.ID
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token string
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v2store v2store.Store
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be backend.Backend
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sync.Mutex // guards the fields below
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version *semver.Version
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members map[types.ID]*Member
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// removed contains the ids of removed members in the cluster.
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// removed id cannot be reused.
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removed map[types.ID]bool
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}
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// ConfigChangeContext represents a context for confChange.
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type ConfigChangeContext struct {
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Member
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// IsPromote indicates if the config change is for promoting a learner member.
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// This flag is needed because both adding a new member and promoting a learner member
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// uses the same config change type 'ConfChangeAddNode'.
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IsPromote bool `json:"isPromote"`
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}
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// NewClusterFromURLsMap creates a new raft cluster using provided urls map. Currently, it does not support creating
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// cluster with raft learner member.
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func NewClusterFromURLsMap(lg *zap.Logger, token string, urlsmap types.URLsMap) (*RaftCluster, error) {
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c := NewCluster(lg, token)
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for name, urls := range urlsmap {
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m := NewMember(name, urls, token, nil)
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if _, ok := c.members[m.ID]; ok {
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return nil, fmt.Errorf("member exists with identical ID %v", m)
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}
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if uint64(m.ID) == raft.None {
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return nil, fmt.Errorf("cannot use %x as member id", raft.None)
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}
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c.members[m.ID] = m
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}
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c.genID()
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return c, nil
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}
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func NewClusterFromMembers(lg *zap.Logger, token string, id types.ID, membs []*Member) *RaftCluster {
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c := NewCluster(lg, token)
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c.cid = id
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for _, m := range membs {
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c.members[m.ID] = m
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}
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return c
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}
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func NewCluster(lg *zap.Logger, token string) *RaftCluster {
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return &RaftCluster{
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lg: lg,
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token: token,
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members: make(map[types.ID]*Member),
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removed: make(map[types.ID]bool),
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}
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}
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func (c *RaftCluster) ID() types.ID { return c.cid }
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func (c *RaftCluster) Members() []*Member {
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c.Lock()
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defer c.Unlock()
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var ms MembersByID
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for _, m := range c.members {
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ms = append(ms, m.Clone())
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}
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sort.Sort(ms)
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return []*Member(ms)
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}
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func (c *RaftCluster) Member(id types.ID) *Member {
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c.Lock()
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defer c.Unlock()
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return c.members[id].Clone()
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}
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func (c *RaftCluster) VotingMembers() []*Member {
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c.Lock()
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defer c.Unlock()
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var ms MembersByID
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for _, m := range c.members {
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if !m.IsLearner {
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ms = append(ms, m.Clone())
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}
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}
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sort.Sort(ms)
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return []*Member(ms)
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}
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// MemberByName returns a Member with the given name if exists.
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// If more than one member has the given name, it will panic.
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func (c *RaftCluster) MemberByName(name string) *Member {
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c.Lock()
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defer c.Unlock()
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var memb *Member
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for _, m := range c.members {
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if m.Name == name {
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if memb != nil {
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if c.lg != nil {
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c.lg.Panic("two member with same name found", zap.String("name", name))
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} else {
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plog.Panicf("two members with the given name %q exist", name)
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}
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}
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memb = m
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}
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}
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return memb.Clone()
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}
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func (c *RaftCluster) MemberIDs() []types.ID {
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c.Lock()
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defer c.Unlock()
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var ids []types.ID
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for _, m := range c.members {
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ids = append(ids, m.ID)
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}
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sort.Sort(types.IDSlice(ids))
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return ids
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}
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func (c *RaftCluster) IsIDRemoved(id types.ID) bool {
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c.Lock()
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defer c.Unlock()
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return c.removed[id]
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}
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// PeerURLs returns a list of all peer addresses.
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// The returned list is sorted in ascending lexicographical order.
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func (c *RaftCluster) PeerURLs() []string {
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c.Lock()
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defer c.Unlock()
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urls := make([]string, 0)
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for _, p := range c.members {
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urls = append(urls, p.PeerURLs...)
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}
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sort.Strings(urls)
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return urls
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}
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// ClientURLs returns a list of all client addresses.
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// The returned list is sorted in ascending lexicographical order.
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func (c *RaftCluster) ClientURLs() []string {
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c.Lock()
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defer c.Unlock()
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urls := make([]string, 0)
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for _, p := range c.members {
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urls = append(urls, p.ClientURLs...)
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}
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sort.Strings(urls)
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return urls
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}
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func (c *RaftCluster) String() string {
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c.Lock()
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defer c.Unlock()
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b := &bytes.Buffer{}
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fmt.Fprintf(b, "{ClusterID:%s ", c.cid)
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var ms []string
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for _, m := range c.members {
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ms = append(ms, fmt.Sprintf("%+v", m))
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}
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fmt.Fprintf(b, "Members:[%s] ", strings.Join(ms, " "))
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var ids []string
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for id := range c.removed {
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ids = append(ids, id.String())
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}
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fmt.Fprintf(b, "RemovedMemberIDs:[%s]}", strings.Join(ids, " "))
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return b.String()
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}
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func (c *RaftCluster) genID() {
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mIDs := c.MemberIDs()
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b := make([]byte, 8*len(mIDs))
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for i, id := range mIDs {
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binary.BigEndian.PutUint64(b[8*i:], uint64(id))
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}
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hash := sha1.Sum(b)
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c.cid = types.ID(binary.BigEndian.Uint64(hash[:8]))
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}
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func (c *RaftCluster) SetID(localID, cid types.ID) {
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c.localID = localID
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c.cid = cid
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}
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func (c *RaftCluster) SetStore(st v2store.Store) { c.v2store = st }
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func (c *RaftCluster) SetBackend(be backend.Backend) {
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c.be = be
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mustCreateBackendBuckets(c.be)
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}
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func (c *RaftCluster) Recover(onSet func(*zap.Logger, *semver.Version)) {
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c.Lock()
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defer c.Unlock()
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c.members, c.removed = membersFromStore(c.lg, c.v2store)
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c.version = clusterVersionFromStore(c.lg, c.v2store)
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mustDetectDowngrade(c.lg, c.version)
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onSet(c.lg, c.version)
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for _, m := range c.members {
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if c.lg != nil {
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c.lg.Info(
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"recovered/added member from store",
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zap.String("cluster-id", c.cid.String()),
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zap.String("local-member-id", c.localID.String()),
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zap.String("recovered-remote-peer-id", m.ID.String()),
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zap.Strings("recovered-remote-peer-urls", m.PeerURLs),
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)
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} else {
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plog.Infof("added member %s %v to cluster %s from store", m.ID, m.PeerURLs, c.cid)
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}
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}
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if c.version != nil {
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if c.lg != nil {
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c.lg.Info(
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"set cluster version from store",
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zap.String("cluster-version", version.Cluster(c.version.String())),
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)
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} else {
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plog.Infof("set the cluster version to %v from store", version.Cluster(c.version.String()))
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}
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}
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}
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// ValidateConfigurationChange takes a proposed ConfChange and
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// ensures that it is still valid.
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func (c *RaftCluster) ValidateConfigurationChange(cc raftpb.ConfChange) error {
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members, removed := membersFromStore(c.lg, c.v2store)
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id := types.ID(cc.NodeID)
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if removed[id] {
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return ErrIDRemoved
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}
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switch cc.Type {
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case raftpb.ConfChangeAddNode, raftpb.ConfChangeAddLearnerNode:
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confChangeContext := new(ConfigChangeContext)
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if err := json.Unmarshal(cc.Context, confChangeContext); err != nil {
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if c.lg != nil {
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c.lg.Panic("failed to unmarshal confChangeContext", zap.Error(err))
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} else {
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plog.Panicf("unmarshal confChangeContext should never fail: %v", err)
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}
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}
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if confChangeContext.IsPromote { // promoting a learner member to voting member
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if members[id] == nil {
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return ErrIDNotFound
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}
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if !members[id].IsLearner {
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return ErrMemberNotLearner
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}
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} else { // adding a new member
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if members[id] != nil {
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return ErrIDExists
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}
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urls := make(map[string]bool)
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for _, m := range members {
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for _, u := range m.PeerURLs {
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urls[u] = true
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}
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}
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for _, u := range confChangeContext.Member.PeerURLs {
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if urls[u] {
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return ErrPeerURLexists
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}
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}
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if confChangeContext.Member.IsLearner { // the new member is a learner
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numLearners := 0
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for _, m := range members {
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if m.IsLearner {
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numLearners++
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}
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}
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if numLearners+1 > maxLearners {
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return ErrTooManyLearners
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}
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}
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}
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case raftpb.ConfChangeRemoveNode:
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if members[id] == nil {
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return ErrIDNotFound
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}
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case raftpb.ConfChangeUpdateNode:
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if members[id] == nil {
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return ErrIDNotFound
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}
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urls := make(map[string]bool)
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for _, m := range members {
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if m.ID == id {
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continue
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}
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for _, u := range m.PeerURLs {
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urls[u] = true
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}
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}
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m := new(Member)
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if err := json.Unmarshal(cc.Context, m); err != nil {
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if c.lg != nil {
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c.lg.Panic("failed to unmarshal member", zap.Error(err))
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} else {
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plog.Panicf("unmarshal member should never fail: %v", err)
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}
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}
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for _, u := range m.PeerURLs {
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if urls[u] {
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return ErrPeerURLexists
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}
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}
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default:
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if c.lg != nil {
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c.lg.Panic("unknown ConfChange type", zap.String("type", cc.Type.String()))
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} else {
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plog.Panicf("ConfChange type should be either AddNode, RemoveNode or UpdateNode")
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}
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}
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return nil
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}
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// AddMember adds a new Member into the cluster, and saves the given member's
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// raftAttributes into the store. The given member should have empty attributes.
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// A Member with a matching id must not exist.
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func (c *RaftCluster) AddMember(m *Member) {
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c.Lock()
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defer c.Unlock()
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if c.v2store != nil {
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mustSaveMemberToStore(c.v2store, m)
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}
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if c.be != nil {
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mustSaveMemberToBackend(c.be, m)
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}
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c.members[m.ID] = m
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if c.lg != nil {
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c.lg.Info(
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"added member",
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zap.String("cluster-id", c.cid.String()),
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zap.String("local-member-id", c.localID.String()),
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zap.String("added-peer-id", m.ID.String()),
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zap.Strings("added-peer-peer-urls", m.PeerURLs),
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)
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} else {
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plog.Infof("added member %s %v to cluster %s", m.ID, m.PeerURLs, c.cid)
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}
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}
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// RemoveMember removes a member from the store.
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// The given id MUST exist, or the function panics.
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func (c *RaftCluster) RemoveMember(id types.ID) {
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c.Lock()
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defer c.Unlock()
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if c.v2store != nil {
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mustDeleteMemberFromStore(c.v2store, id)
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}
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if c.be != nil {
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mustDeleteMemberFromBackend(c.be, id)
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}
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m, ok := c.members[id]
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delete(c.members, id)
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c.removed[id] = true
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if c.lg != nil {
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if ok {
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c.lg.Info(
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"removed member",
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zap.String("cluster-id", c.cid.String()),
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zap.String("local-member-id", c.localID.String()),
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zap.String("removed-remote-peer-id", id.String()),
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zap.Strings("removed-remote-peer-urls", m.PeerURLs),
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)
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} else {
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c.lg.Warn(
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"skipped removing already removed member",
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zap.String("cluster-id", c.cid.String()),
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zap.String("local-member-id", c.localID.String()),
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zap.String("removed-remote-peer-id", id.String()),
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)
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}
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} else {
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plog.Infof("removed member %s from cluster %s", id, c.cid)
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}
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}
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func (c *RaftCluster) UpdateAttributes(id types.ID, attr Attributes) {
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c.Lock()
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defer c.Unlock()
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if m, ok := c.members[id]; ok {
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m.Attributes = attr
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if c.v2store != nil {
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mustUpdateMemberAttrInStore(c.v2store, m)
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}
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if c.be != nil {
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mustSaveMemberToBackend(c.be, m)
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}
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return
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}
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_, ok := c.removed[id]
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if !ok {
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if c.lg != nil {
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c.lg.Panic(
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"failed to update; member unknown",
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zap.String("cluster-id", c.cid.String()),
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zap.String("local-member-id", c.localID.String()),
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zap.String("unknown-remote-peer-id", id.String()),
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)
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} else {
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plog.Panicf("error updating attributes of unknown member %s", id)
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}
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}
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if c.lg != nil {
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c.lg.Warn(
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"skipped attributes update of removed member",
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zap.String("cluster-id", c.cid.String()),
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zap.String("local-member-id", c.localID.String()),
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zap.String("updated-peer-id", id.String()),
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)
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} else {
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plog.Warningf("skipped updating attributes of removed member %s", id)
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}
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}
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// PromoteMember marks the member's IsLearner RaftAttributes to false.
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func (c *RaftCluster) PromoteMember(id types.ID) {
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c.Lock()
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defer c.Unlock()
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c.members[id].RaftAttributes.IsLearner = false
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if c.v2store != nil {
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mustUpdateMemberInStore(c.v2store, c.members[id])
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}
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if c.be != nil {
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mustSaveMemberToBackend(c.be, c.members[id])
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}
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if c.lg != nil {
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c.lg.Info(
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"promote member",
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zap.String("cluster-id", c.cid.String()),
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zap.String("local-member-id", c.localID.String()),
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)
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} else {
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plog.Noticef("promote member %s in cluster %s", id, c.cid)
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}
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}
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func (c *RaftCluster) UpdateRaftAttributes(id types.ID, raftAttr RaftAttributes) {
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c.Lock()
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defer c.Unlock()
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c.members[id].RaftAttributes = raftAttr
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if c.v2store != nil {
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mustUpdateMemberInStore(c.v2store, c.members[id])
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}
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if c.be != nil {
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mustSaveMemberToBackend(c.be, c.members[id])
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}
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if c.lg != nil {
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c.lg.Info(
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"updated member",
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zap.String("cluster-id", c.cid.String()),
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zap.String("local-member-id", c.localID.String()),
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zap.String("updated-remote-peer-id", id.String()),
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zap.Strings("updated-remote-peer-urls", raftAttr.PeerURLs),
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)
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} else {
|
|
plog.Noticef("updated member %s %v in cluster %s", id, raftAttr.PeerURLs, c.cid)
|
|
}
|
|
}
|
|
|
|
func (c *RaftCluster) Version() *semver.Version {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
if c.version == nil {
|
|
return nil
|
|
}
|
|
return semver.Must(semver.NewVersion(c.version.String()))
|
|
}
|
|
|
|
func (c *RaftCluster) SetVersion(ver *semver.Version, onSet func(*zap.Logger, *semver.Version)) {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
if c.version != nil {
|
|
if c.lg != nil {
|
|
c.lg.Info(
|
|
"updated cluster version",
|
|
zap.String("cluster-id", c.cid.String()),
|
|
zap.String("local-member-id", c.localID.String()),
|
|
zap.String("from", version.Cluster(c.version.String())),
|
|
zap.String("from", version.Cluster(ver.String())),
|
|
)
|
|
} else {
|
|
plog.Noticef("updated the cluster version from %v to %v", version.Cluster(c.version.String()), version.Cluster(ver.String()))
|
|
}
|
|
} else {
|
|
if c.lg != nil {
|
|
c.lg.Info(
|
|
"set initial cluster version",
|
|
zap.String("cluster-id", c.cid.String()),
|
|
zap.String("local-member-id", c.localID.String()),
|
|
zap.String("cluster-version", version.Cluster(ver.String())),
|
|
)
|
|
} else {
|
|
plog.Noticef("set the initial cluster version to %v", version.Cluster(ver.String()))
|
|
}
|
|
}
|
|
oldVer := c.version
|
|
c.version = ver
|
|
mustDetectDowngrade(c.lg, c.version)
|
|
if c.v2store != nil {
|
|
mustSaveClusterVersionToStore(c.v2store, ver)
|
|
}
|
|
if c.be != nil {
|
|
mustSaveClusterVersionToBackend(c.be, ver)
|
|
}
|
|
if oldVer != nil {
|
|
ClusterVersionMetrics.With(prometheus.Labels{"cluster_version": version.Cluster(oldVer.String())}).Set(0)
|
|
}
|
|
ClusterVersionMetrics.With(prometheus.Labels{"cluster_version": version.Cluster(ver.String())}).Set(1)
|
|
onSet(c.lg, ver)
|
|
}
|
|
|
|
func (c *RaftCluster) IsReadyToAddVotingMember() bool {
|
|
nmembers := 1
|
|
nstarted := 0
|
|
|
|
for _, member := range c.VotingMembers() {
|
|
if member.IsStarted() {
|
|
nstarted++
|
|
}
|
|
nmembers++
|
|
}
|
|
|
|
if nstarted == 1 && nmembers == 2 {
|
|
// a case of adding a new node to 1-member cluster for restoring cluster data
|
|
// https://github.com/etcd-io/etcd/blob/master/Documentation/v2/admin_guide.md#restoring-the-cluster
|
|
if c.lg != nil {
|
|
c.lg.Debug("number of started member is 1; can accept add member request")
|
|
} else {
|
|
plog.Debugf("The number of started member is 1. This cluster can accept add member request.")
|
|
}
|
|
return true
|
|
}
|
|
|
|
nquorum := nmembers/2 + 1
|
|
if nstarted < nquorum {
|
|
if c.lg != nil {
|
|
c.lg.Warn(
|
|
"rejecting member add; started member will be less than quorum",
|
|
zap.Int("number-of-started-member", nstarted),
|
|
zap.Int("quorum", nquorum),
|
|
zap.String("cluster-id", c.cid.String()),
|
|
zap.String("local-member-id", c.localID.String()),
|
|
)
|
|
} else {
|
|
plog.Warningf("Reject add member request: the number of started member (%d) will be less than the quorum number of the cluster (%d)", nstarted, nquorum)
|
|
}
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func (c *RaftCluster) IsReadyToRemoveVotingMember(id uint64) bool {
|
|
nmembers := 0
|
|
nstarted := 0
|
|
|
|
for _, member := range c.VotingMembers() {
|
|
if uint64(member.ID) == id {
|
|
continue
|
|
}
|
|
|
|
if member.IsStarted() {
|
|
nstarted++
|
|
}
|
|
nmembers++
|
|
}
|
|
|
|
nquorum := nmembers/2 + 1
|
|
if nstarted < nquorum {
|
|
if c.lg != nil {
|
|
c.lg.Warn(
|
|
"rejecting member remove; started member will be less than quorum",
|
|
zap.Int("number-of-started-member", nstarted),
|
|
zap.Int("quorum", nquorum),
|
|
zap.String("cluster-id", c.cid.String()),
|
|
zap.String("local-member-id", c.localID.String()),
|
|
)
|
|
} else {
|
|
plog.Warningf("Reject remove member request: the number of started member (%d) will be less than the quorum number of the cluster (%d)", nstarted, nquorum)
|
|
}
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func (c *RaftCluster) IsReadyToPromoteMember(id uint64) bool {
|
|
nmembers := 1 // We count the learner to be promoted for the future quorum
|
|
nstarted := 1 // and we also count it as started.
|
|
|
|
for _, member := range c.VotingMembers() {
|
|
if member.IsStarted() {
|
|
nstarted++
|
|
}
|
|
nmembers++
|
|
}
|
|
|
|
nquorum := nmembers/2 + 1
|
|
if nstarted < nquorum {
|
|
if c.lg != nil {
|
|
c.lg.Warn(
|
|
"rejecting member promote; started member will be less than quorum",
|
|
zap.Int("number-of-started-member", nstarted),
|
|
zap.Int("quorum", nquorum),
|
|
zap.String("cluster-id", c.cid.String()),
|
|
zap.String("local-member-id", c.localID.String()),
|
|
)
|
|
} else {
|
|
plog.Warningf("Reject promote member request: the number of started member (%d) will be less than the quorum number of the cluster (%d)", nstarted, nquorum)
|
|
}
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func membersFromStore(lg *zap.Logger, st v2store.Store) (map[types.ID]*Member, map[types.ID]bool) {
|
|
members := make(map[types.ID]*Member)
|
|
removed := make(map[types.ID]bool)
|
|
e, err := st.Get(StoreMembersPrefix, true, true)
|
|
if err != nil {
|
|
if isKeyNotFound(err) {
|
|
return members, removed
|
|
}
|
|
if lg != nil {
|
|
lg.Panic("failed to get members from store", zap.String("path", StoreMembersPrefix), zap.Error(err))
|
|
} else {
|
|
plog.Panicf("get storeMembers should never fail: %v", err)
|
|
}
|
|
}
|
|
for _, n := range e.Node.Nodes {
|
|
var m *Member
|
|
m, err = nodeToMember(n)
|
|
if err != nil {
|
|
if lg != nil {
|
|
lg.Panic("failed to nodeToMember", zap.Error(err))
|
|
} else {
|
|
plog.Panicf("nodeToMember should never fail: %v", err)
|
|
}
|
|
}
|
|
members[m.ID] = m
|
|
}
|
|
|
|
e, err = st.Get(storeRemovedMembersPrefix, true, true)
|
|
if err != nil {
|
|
if isKeyNotFound(err) {
|
|
return members, removed
|
|
}
|
|
if lg != nil {
|
|
lg.Panic(
|
|
"failed to get removed members from store",
|
|
zap.String("path", storeRemovedMembersPrefix),
|
|
zap.Error(err),
|
|
)
|
|
} else {
|
|
plog.Panicf("get storeRemovedMembers should never fail: %v", err)
|
|
}
|
|
}
|
|
for _, n := range e.Node.Nodes {
|
|
removed[MustParseMemberIDFromKey(n.Key)] = true
|
|
}
|
|
return members, removed
|
|
}
|
|
|
|
func clusterVersionFromStore(lg *zap.Logger, st v2store.Store) *semver.Version {
|
|
e, err := st.Get(path.Join(storePrefix, "version"), false, false)
|
|
if err != nil {
|
|
if isKeyNotFound(err) {
|
|
return nil
|
|
}
|
|
if lg != nil {
|
|
lg.Panic(
|
|
"failed to get cluster version from store",
|
|
zap.String("path", path.Join(storePrefix, "version")),
|
|
zap.Error(err),
|
|
)
|
|
} else {
|
|
plog.Panicf("unexpected error (%v) when getting cluster version from store", err)
|
|
}
|
|
}
|
|
return semver.Must(semver.NewVersion(*e.Node.Value))
|
|
}
|
|
|
|
// 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.
|
|
func ValidateClusterAndAssignIDs(lg *zap.Logger, local *RaftCluster, existing *RaftCluster) error {
|
|
ems := existing.Members()
|
|
lms := local.Members()
|
|
if len(ems) != len(lms) {
|
|
return fmt.Errorf("member count is unequal")
|
|
}
|
|
sort.Sort(MembersByPeerURLs(ems))
|
|
sort.Sort(MembersByPeerURLs(lms))
|
|
|
|
ctx, cancel := context.WithTimeout(context.TODO(), 30*time.Second)
|
|
defer cancel()
|
|
for i := range ems {
|
|
if ok, err := netutil.URLStringsEqual(ctx, lg, ems[i].PeerURLs, lms[i].PeerURLs); !ok {
|
|
return fmt.Errorf("unmatched member while checking PeerURLs (%v)", err)
|
|
}
|
|
lms[i].ID = ems[i].ID
|
|
}
|
|
local.members = make(map[types.ID]*Member)
|
|
for _, m := range lms {
|
|
local.members[m.ID] = m
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func mustDetectDowngrade(lg *zap.Logger, cv *semver.Version) {
|
|
lv := semver.Must(semver.NewVersion(version.Version))
|
|
// only keep major.minor version for comparison against cluster version
|
|
lv = &semver.Version{Major: lv.Major, Minor: lv.Minor}
|
|
if cv != nil && lv.LessThan(*cv) {
|
|
if lg != nil {
|
|
lg.Fatal(
|
|
"invalid downgrade; server version is lower than determined cluster version",
|
|
zap.String("current-server-version", version.Version),
|
|
zap.String("determined-cluster-version", version.Cluster(cv.String())),
|
|
)
|
|
} else {
|
|
plog.Fatalf("cluster cannot be downgraded (current version: %s is lower than determined cluster version: %s).", version.Version, version.Cluster(cv.String()))
|
|
}
|
|
}
|
|
}
|
|
|
|
// IsLocalMemberLearner returns if the local member is raft learner
|
|
func (c *RaftCluster) IsLocalMemberLearner() bool {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
localMember, ok := c.members[c.localID]
|
|
if !ok {
|
|
if c.lg != nil {
|
|
c.lg.Error(
|
|
"failed to find local ID in cluster members",
|
|
zap.String("cluster-id", c.cid.String()),
|
|
zap.String("local-member-id", c.localID.String()),
|
|
)
|
|
} else {
|
|
plog.Errorf("failed to find local ID %s in cluster %s", c.localID.String(), c.cid.String())
|
|
}
|
|
return false
|
|
}
|
|
return localMember.IsLearner
|
|
}
|
|
|
|
// IsMemberExist returns if the member with the given id exists in cluster.
|
|
func (c *RaftCluster) IsMemberExist(id types.ID) bool {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
_, ok := c.members[id]
|
|
return ok
|
|
}
|
|
|
|
// VotingMemberIDs returns the ID of voting members in cluster.
|
|
func (c *RaftCluster) VotingMemberIDs() []types.ID {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
var ids []types.ID
|
|
for _, m := range c.members {
|
|
if !m.IsLearner {
|
|
ids = append(ids, m.ID)
|
|
}
|
|
}
|
|
sort.Sort(types.IDSlice(ids))
|
|
return ids
|
|
}
|