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replication_mode.go
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replication_mode.go
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// Copyright 2020 TiKV Project Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package replication
import (
"bytes"
"context"
"encoding/json"
"reflect"
"sort"
"strings"
"sync"
"time"
"github.com/pingcap/kvproto/pkg/pdpb"
pb "github.com/pingcap/kvproto/pkg/replication_modepb"
"github.com/pingcap/log"
"github.com/tikv/pd/pkg/core"
"github.com/tikv/pd/pkg/errs"
sche "github.com/tikv/pd/pkg/schedule/core"
"github.com/tikv/pd/pkg/schedule/placement"
"github.com/tikv/pd/pkg/storage/endpoint"
"github.com/tikv/pd/pkg/utils/logutil"
"github.com/tikv/pd/pkg/utils/syncutil"
"github.com/tikv/pd/server/config"
"go.uber.org/zap"
)
const (
modeMajority = "majority"
modeDRAutoSync = "dr-auto-sync"
defaultDRTiKVSyncTimeoutHint = time.Minute
)
func modeToPB(m string) pb.ReplicationMode {
switch m {
case modeMajority:
return pb.ReplicationMode_MAJORITY
case modeDRAutoSync:
return pb.ReplicationMode_DR_AUTO_SYNC
}
return 0
}
// FileReplicater is the interface that can save important data to all cluster
// nodes.
type FileReplicater interface {
GetMembers() ([]*pdpb.Member, error)
ReplicateFileToMember(ctx context.Context, member *pdpb.Member, name string, data []byte) error
}
// DrStatusFile is the file name that stores the dr status.
const DrStatusFile = "DR_STATE"
const persistFileTimeout = time.Second * 3
// ModeManager is used to control how raft logs are synchronized between
// different tikv nodes.
type ModeManager struct {
initTime time.Time
syncutil.RWMutex
config config.ReplicationModeConfig
storage endpoint.ReplicationStatusStorage
cluster sche.ClusterInformer
fileReplicater FileReplicater
replicateState sync.Map
drAutoSync drAutoSyncStatus
// intermediate states of the recovery process
// they are accessed without locks as they are only used by background job.
drRecoverKey []byte // all regions that has startKey < drRecoverKey are successfully recovered
drRecoverCount int // number of regions that has startKey < drRecoverKey
// When find a region that is not recovered, PD will not check all the
// remaining regions, but read a region to estimate the overall progress
drSampleRecoverCount int // number of regions that are recovered in sample
drSampleTotalRegion int // number of regions in sample
drTotalRegion int // number of all regions
drStoreStatus sync.Map
}
// NewReplicationModeManager creates the replicate mode manager.
func NewReplicationModeManager(config config.ReplicationModeConfig, storage endpoint.ReplicationStatusStorage, cluster sche.ClusterInformer, fileReplicater FileReplicater) (*ModeManager, error) {
m := &ModeManager{
initTime: time.Now(),
config: config,
storage: storage,
cluster: cluster,
fileReplicater: fileReplicater,
}
switch config.ReplicationMode {
case modeMajority:
case modeDRAutoSync:
if err := m.loadDRAutoSync(); err != nil {
return nil, err
}
}
return m, nil
}
// UpdateConfig updates configuration online and updates internal state.
func (m *ModeManager) UpdateConfig(config config.ReplicationModeConfig) error {
m.Lock()
defer m.Unlock()
// If mode change from 'majority' to 'dr-auto-sync', or label key is updated switch to 'sync_recover'.
if m.config.ReplicationMode == modeMajority && config.ReplicationMode == modeDRAutoSync {
old := m.config
m.config = config
err := m.drSwitchToSyncRecoverWithLock()
if err != nil {
// restore
m.config = old
}
return err
}
m.config = config
return nil
}
// GetReplicationStatus returns the status to sync with tikv servers.
func (m *ModeManager) GetReplicationStatus() *pb.ReplicationStatus {
m.RLock()
defer m.RUnlock()
p := &pb.ReplicationStatus{
Mode: modeToPB(m.config.ReplicationMode),
}
switch m.config.ReplicationMode {
case modeMajority:
case modeDRAutoSync:
p.DrAutoSync = &pb.DRAutoSync{
LabelKey: m.config.DRAutoSync.LabelKey,
State: pb.DRAutoSyncState(pb.DRAutoSyncState_value[strings.ToUpper(m.drAutoSync.State)]),
StateId: m.drAutoSync.StateID,
// TODO: make it works, ref https://github.com/tikv/tikv/issues/7945
WaitSyncTimeoutHint: int32(defaultDRTiKVSyncTimeoutHint.Seconds()),
AvailableStores: m.drAutoSync.AvailableStores,
PauseRegionSplit: m.config.DRAutoSync.PauseRegionSplit && m.drAutoSync.State != drStateSync,
}
}
return p
}
// IsRegionSplitPaused returns true if region split need be paused.
func (m *ModeManager) IsRegionSplitPaused() bool {
m.RLock()
defer m.RUnlock()
return m.config.ReplicationMode == modeDRAutoSync &&
m.config.DRAutoSync.PauseRegionSplit &&
m.drAutoSync.State != drStateSync
}
// HTTPReplicationStatus is for query status from HTTP API.
type HTTPReplicationStatus struct {
Mode string `json:"mode"`
DrAutoSync struct {
LabelKey string `json:"label_key"`
State string `json:"state"`
StateID uint64 `json:"state_id,omitempty"`
ACIDConsistent bool `json:"acid_consistent"`
TotalRegions int `json:"total_regions,omitempty"`
SyncedRegions int `json:"synced_regions,omitempty"`
RecoverProgress float32 `json:"recover_progress,omitempty"`
} `json:"dr-auto-sync,omitempty"`
}
// GetReplicationStatusHTTP returns status for HTTP API.
func (m *ModeManager) GetReplicationStatusHTTP() *HTTPReplicationStatus {
m.RLock()
defer m.RUnlock()
var status HTTPReplicationStatus
status.Mode = m.config.ReplicationMode
switch status.Mode {
case modeMajority:
case modeDRAutoSync:
status.DrAutoSync.LabelKey = m.config.DRAutoSync.LabelKey
status.DrAutoSync.State = m.drAutoSync.State
status.DrAutoSync.StateID = m.drAutoSync.StateID
status.DrAutoSync.ACIDConsistent = m.drAutoSync.State != drStateSyncRecover
status.DrAutoSync.RecoverProgress = m.drAutoSync.RecoverProgress
status.DrAutoSync.TotalRegions = m.drAutoSync.TotalRegions
status.DrAutoSync.SyncedRegions = m.drAutoSync.SyncedRegions
}
return &status
}
func (m *ModeManager) getModeName() string {
m.RLock()
defer m.RUnlock()
return m.config.ReplicationMode
}
const (
drStateSync = "sync"
drStateAsyncWait = "async_wait"
drStateAsync = "async"
drStateSyncRecover = "sync_recover"
)
type drAutoSyncStatus struct {
State string `json:"state,omitempty"`
StateID uint64 `json:"state_id,omitempty"`
RecoverStartTime *time.Time `json:"recover_start,omitempty"`
TotalRegions int `json:"total_regions,omitempty"`
SyncedRegions int `json:"synced_regions,omitempty"`
RecoverProgress float32 `json:"recover_progress,omitempty"`
AvailableStores []uint64 `json:"available_stores,omitempty"`
}
func (m *ModeManager) loadDRAutoSync() error {
ok, err := m.storage.LoadReplicationStatus(modeDRAutoSync, &m.drAutoSync)
if err != nil {
return err
}
if !ok {
// initialize
return m.drSwitchToSync()
}
return nil
}
func (m *ModeManager) drSwitchToAsyncWait(availableStores []uint64) error {
m.Lock()
defer m.Unlock()
id, err := m.cluster.AllocID()
if err != nil {
log.Warn("failed to switch to async wait state", zap.String("replicate-mode", modeDRAutoSync), errs.ZapError(err))
return err
}
dr := drAutoSyncStatus{State: drStateAsyncWait, StateID: id, AvailableStores: availableStores}
if err := m.storage.SaveReplicationStatus(modeDRAutoSync, dr); err != nil {
log.Warn("failed to switch to async state", zap.String("replicate-mode", modeDRAutoSync), errs.ZapError(err))
return err
}
m.drAutoSync = dr
log.Info("switched to async_wait state", zap.String("replicate-mode", modeDRAutoSync))
return nil
}
func (m *ModeManager) drSwitchToAsync(availableStores []uint64) error {
m.Lock()
defer m.Unlock()
return m.drSwitchToAsyncWithLock(availableStores)
}
func (m *ModeManager) drSwitchToAsyncWithLock(availableStores []uint64) error {
id, err := m.cluster.AllocID()
if err != nil {
log.Warn("failed to switch to async state", zap.String("replicate-mode", modeDRAutoSync), errs.ZapError(err))
return err
}
dr := drAutoSyncStatus{State: drStateAsync, StateID: id, AvailableStores: availableStores}
if err := m.storage.SaveReplicationStatus(modeDRAutoSync, dr); err != nil {
log.Warn("failed to switch to async state", zap.String("replicate-mode", modeDRAutoSync), errs.ZapError(err))
return err
}
m.drAutoSync = dr
log.Info("switched to async state", zap.String("replicate-mode", modeDRAutoSync))
return nil
}
func (m *ModeManager) drSwitchToSyncRecover() error {
m.Lock()
defer m.Unlock()
return m.drSwitchToSyncRecoverWithLock()
}
func (m *ModeManager) drSwitchToSyncRecoverWithLock() error {
id, err := m.cluster.AllocID()
if err != nil {
log.Warn("failed to switch to sync_recover state", zap.String("replicate-mode", modeDRAutoSync), errs.ZapError(err))
return err
}
now := time.Now()
dr := drAutoSyncStatus{State: drStateSyncRecover, StateID: id, RecoverStartTime: &now}
if err = m.storage.SaveReplicationStatus(modeDRAutoSync, dr); err != nil {
log.Warn("failed to switch to sync_recover state", zap.String("replicate-mode", modeDRAutoSync), errs.ZapError(err))
return err
}
m.drAutoSync = dr
m.drRecoverKey, m.drRecoverCount = nil, 0
log.Info("switched to sync_recover state", zap.String("replicate-mode", modeDRAutoSync))
return nil
}
func (m *ModeManager) drSwitchToSync() error {
m.Lock()
defer m.Unlock()
id, err := m.cluster.AllocID()
if err != nil {
log.Warn("failed to switch to sync state", zap.String("replicate-mode", modeDRAutoSync), errs.ZapError(err))
return err
}
dr := drAutoSyncStatus{State: drStateSync, StateID: id}
if err := m.storage.SaveReplicationStatus(modeDRAutoSync, dr); err != nil {
log.Warn("failed to switch to sync state", zap.String("replicate-mode", modeDRAutoSync), errs.ZapError(err))
return err
}
m.drAutoSync = dr
log.Info("switched to sync state", zap.String("replicate-mode", modeDRAutoSync))
return nil
}
func (m *ModeManager) drGetState() string {
m.RLock()
defer m.RUnlock()
return m.drAutoSync.State
}
const (
idleTimeout = time.Minute
tickInterval = 500 * time.Millisecond
replicateStateInterval = time.Second * 5
)
// Run starts the background job.
func (m *ModeManager) Run(ctx context.Context) {
// Wait for a while when just start, in case tikv do not connect in time.
timer := time.NewTimer(idleTimeout)
defer timer.Stop()
select {
case <-timer.C:
case <-ctx.Done():
return
}
var wg sync.WaitGroup
wg.Add(2)
go func() {
defer wg.Done()
ticker := time.NewTicker(tickInterval)
defer ticker.Stop()
for {
select {
case <-ticker.C:
m.tickUpdateState()
case <-ctx.Done():
return
}
}
}()
go func() {
defer wg.Done()
ticker := time.NewTicker(replicateStateInterval)
defer ticker.Stop()
for {
select {
case <-ticker.C:
m.tickReplicateStatus()
case <-ctx.Done():
return
}
}
}()
wg.Wait()
}
func minimalUpVoters(rule *placement.Rule, upStores, downStores []*core.StoreInfo) int {
if rule.Role == placement.Learner {
return 0
}
var up, down int
for _, s := range upStores {
if placement.MatchLabelConstraints(s, rule.LabelConstraints) {
up++
}
}
for _, s := range downStores {
if placement.MatchLabelConstraints(s, rule.LabelConstraints) {
down++
}
}
minimalUp := rule.Count - down
if minimalUp < 0 {
minimalUp = 0
}
if minimalUp > up {
minimalUp = up
}
return minimalUp
}
func (m *ModeManager) tickUpdateState() {
if m.getModeName() != modeDRAutoSync {
return
}
drTickCounter.Inc()
stores, storeIDs := m.checkStoreStatus()
var primaryHasVoter, drHasVoter bool
var totalVoter, totalUpVoter int
for _, r := range m.cluster.GetRuleManager().GetAllRules() {
if len(r.StartKey) > 0 || len(r.EndKey) > 0 {
// All rules should be global rules. If not, skip it.
continue
}
if r.Role != placement.Learner {
totalVoter += r.Count
}
minimalUpPrimary := minimalUpVoters(r, stores[primaryUp], stores[primaryDown])
minimalUpDr := minimalUpVoters(r, stores[drUp], stores[drDown])
primaryHasVoter = primaryHasVoter || minimalUpPrimary > 0
drHasVoter = drHasVoter || minimalUpDr > 0
upVoters := minimalUpPrimary + minimalUpDr
if upVoters > r.Count {
upVoters = r.Count
}
totalUpVoter += upVoters
}
// canSync is true when every region has at least 1 voter replica in each DC.
// hasMajority is true when every region has majority peer online.
canSync := primaryHasVoter && drHasVoter
hasMajority := totalUpVoter*2 > totalVoter
log.Debug("replication store status",
zap.Uint64s("up-primary", storeIDs[primaryUp]),
zap.Uint64s("up-dr", storeIDs[drUp]),
zap.Uint64s("down-primary", storeIDs[primaryDown]),
zap.Uint64s("down-dr", storeIDs[drDown]),
zap.Bool("can-sync", canSync),
zap.Bool("has-majority", hasMajority),
)
/*
+----+ all region sync +------------+
|SYNC| <----------------------- |SYNC_RECOVER|
+----+ +------------+
|^ ^ |
DR down|| | |DR down
||DR up DR up| |
v| | v
+----------+ all tikv sync +-----+
+--> |ASYNC_WAIT|------------------------> |ASYNC|<------+
| +----------+ +-----+ |
| | | |
|tikv up/down| |tikv up/down|
+------------+ +------------+
*/
switch m.drGetState() {
case drStateSync:
// If hasMajority is false, the cluster is always unavailable. Switch to async won't help.
if !canSync && hasMajority {
m.drSwitchToAsyncWait(storeIDs[primaryUp])
}
case drStateAsyncWait:
if canSync {
m.drSwitchToSync()
break
}
if oldAvailableStores := m.drGetAvailableStores(); !reflect.DeepEqual(oldAvailableStores, storeIDs[primaryUp]) {
m.drSwitchToAsyncWait(storeIDs[primaryUp])
break
}
if m.drCheckStoreStateUpdated(storeIDs[primaryUp]) {
m.drSwitchToAsync(storeIDs[primaryUp])
}
case drStateAsync:
if canSync {
m.drSwitchToSyncRecover()
break
}
if !reflect.DeepEqual(m.drGetAvailableStores(), storeIDs[primaryUp]) && m.drCheckStoreStateUpdated(storeIDs[primaryUp]) {
m.drSwitchToAsync(storeIDs[primaryUp])
}
case drStateSyncRecover:
if !canSync && hasMajority {
m.drSwitchToAsync(storeIDs[primaryUp])
} else {
m.updateProgress()
progress := m.estimateProgress()
drRecoveredRegionGauge.Set(float64(m.drRecoverCount))
drRecoverProgressGauge.Set(float64(progress))
if progress == 1.0 {
m.drSwitchToSync()
} else {
m.updateRecoverProgress(progress)
}
}
}
}
func (m *ModeManager) tickReplicateStatus() {
if m.getModeName() != modeDRAutoSync {
return
}
m.RLock()
state := drAutoSyncStatus{
State: m.drAutoSync.State,
StateID: m.drAutoSync.StateID,
AvailableStores: m.drAutoSync.AvailableStores,
RecoverStartTime: m.drAutoSync.RecoverStartTime,
}
m.RUnlock()
// recording metrics
var stateNumber float64
switch state.State {
case drStateSync:
stateNumber = 1
case drStateAsyncWait:
stateNumber = 2
case drStateAsync:
stateNumber = 3
case drStateSyncRecover:
stateNumber = 4
}
drStateGauge.Set(stateNumber)
drStateIDGauge.Set(float64(state.StateID))
data, _ := json.Marshal(state)
members, err := m.fileReplicater.GetMembers()
if err != nil {
log.Warn("failed to get members", zap.String("replicate-mode", modeDRAutoSync))
return
}
for _, member := range members {
stateID, ok := m.replicateState.Load(member.GetMemberId())
if !ok || stateID.(uint64) != state.StateID {
ctx, cancel := context.WithTimeout(context.Background(), persistFileTimeout)
err := m.fileReplicater.ReplicateFileToMember(ctx, member, DrStatusFile, data)
if err != nil {
log.Warn("failed to switch state", zap.String("replicate-mode", modeDRAutoSync), zap.String("new-state", state.State), errs.ZapError(err))
} else {
m.replicateState.Store(member.GetMemberId(), state.StateID)
}
cancel()
}
}
}
const (
primaryUp = iota
primaryDown
drUp
drDown
storeStatusTypeCount
)
func (m *ModeManager) checkStoreStatus() ([][]*core.StoreInfo, [][]uint64) {
m.RLock()
defer m.RUnlock()
stores, storeIDs := make([][]*core.StoreInfo, storeStatusTypeCount), make([][]uint64, storeStatusTypeCount)
for _, s := range m.cluster.GetStores() {
if s.IsRemoved() {
continue
}
down := s.DownTime() >= m.config.DRAutoSync.WaitStoreTimeout.Duration
labelValue := s.GetLabelValue(m.config.DRAutoSync.LabelKey)
if labelValue == m.config.DRAutoSync.Primary {
if down {
stores[primaryDown] = append(stores[primaryDown], s)
storeIDs[primaryDown] = append(storeIDs[primaryDown], s.GetID())
} else {
stores[primaryUp] = append(stores[primaryUp], s)
storeIDs[primaryUp] = append(storeIDs[primaryUp], s.GetID())
}
}
if labelValue == m.config.DRAutoSync.DR {
if down {
stores[drDown] = append(stores[drDown], s)
storeIDs[drDown] = append(storeIDs[drDown], s.GetID())
} else {
stores[drUp] = append(stores[drUp], s)
storeIDs[drUp] = append(storeIDs[drUp], s.GetID())
}
}
}
for i := range stores {
sort.Slice(stores[i], func(a, b int) bool { return stores[i][a].GetID() < stores[i][b].GetID() })
sort.Slice(storeIDs[i], func(a, b int) bool { return storeIDs[i][a] < storeIDs[i][b] })
}
return stores, storeIDs
}
// UpdateStoreDRStatus saves the dr-autosync status of a store.
func (m *ModeManager) UpdateStoreDRStatus(id uint64, status *pb.StoreDRAutoSyncStatus) {
m.drStoreStatus.Store(id, status)
}
func (m *ModeManager) drGetAvailableStores() []uint64 {
m.RLock()
defer m.RUnlock()
return m.drAutoSync.AvailableStores
}
func (m *ModeManager) drCheckStoreStateUpdated(stores []uint64) bool {
state := m.GetReplicationStatus().GetDrAutoSync()
for _, s := range stores {
status, ok := m.drStoreStatus.Load(s)
if !ok {
return false
}
drStatus := status.(*pb.StoreDRAutoSyncStatus)
if drStatus.GetState() != state.GetState() || drStatus.GetStateId() != state.GetStateId() {
return false
}
}
return true
}
var (
regionScanBatchSize = 1024
regionMinSampleSize = 512
)
func (m *ModeManager) updateProgress() {
m.RLock()
defer m.RUnlock()
for len(m.drRecoverKey) > 0 || m.drRecoverCount == 0 {
regions := m.cluster.ScanRegions(m.drRecoverKey, nil, regionScanBatchSize)
if len(regions) == 0 {
log.Warn("scan empty regions",
logutil.ZapRedactByteString("recover-key", m.drRecoverKey))
return
}
for i, r := range regions {
if m.checkRegionRecover(r, m.drRecoverKey) {
m.drRecoverKey = r.GetEndKey()
m.drRecoverCount++
continue
}
// take sample and quit iteration.
sampleRegions := regions[i:]
if len(sampleRegions) < regionMinSampleSize {
if last := sampleRegions[len(sampleRegions)-1]; len(last.GetEndKey()) > 0 {
sampleRegions = append(sampleRegions, m.cluster.ScanRegions(last.GetEndKey(), nil, regionMinSampleSize)...)
}
}
m.drSampleRecoverCount = 0
key := m.drRecoverKey
for _, r := range sampleRegions {
if m.checkRegionRecover(r, key) {
m.drSampleRecoverCount++
}
key = r.GetEndKey()
}
m.drSampleTotalRegion = len(sampleRegions)
m.drTotalRegion = m.cluster.GetTotalRegionCount()
return
}
}
}
func (m *ModeManager) estimateProgress() float32 {
if len(m.drRecoverKey) == 0 && m.drRecoverCount > 0 {
return 1.0
}
// make sure progress less than 1
if m.drSampleTotalRegion <= m.drSampleRecoverCount {
m.drSampleTotalRegion = m.drSampleRecoverCount + 1
}
totalUnchecked := m.drTotalRegion - m.drRecoverCount
if totalUnchecked < m.drSampleTotalRegion {
totalUnchecked = m.drSampleTotalRegion
}
total := m.drRecoverCount + totalUnchecked
uncheckRecovered := float32(totalUnchecked) * float32(m.drSampleRecoverCount) / float32(m.drSampleTotalRegion)
return (float32(m.drRecoverCount) + uncheckRecovered) / float32(total)
}
func (m *ModeManager) checkRegionRecover(region *core.RegionInfo, startKey []byte) bool {
// if the region not contains the key, log it and return false
if bytes.Compare(startKey, region.GetStartKey()) < 0 {
log.Warn("found region gap",
logutil.ZapRedactByteString("key", core.HexRegionKey(startKey)),
logutil.ZapRedactStringer("region", core.RegionToHexMeta(region.GetMeta())),
zap.Uint64("region-id", region.GetID()))
return false
}
return region.GetReplicationStatus().GetStateId() == m.drAutoSync.StateID &&
region.GetReplicationStatus().GetState() == pb.RegionReplicationState_INTEGRITY_OVER_LABEL
}
func (m *ModeManager) updateRecoverProgress(progress float32) {
m.Lock()
defer m.Unlock()
m.drAutoSync.RecoverProgress = progress
m.drAutoSync.TotalRegions = m.drTotalRegion
m.drAutoSync.SyncedRegions = m.drRecoverCount
}