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scheduler.go
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scheduler.go
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package test_raftstore
import (
"bytes"
"context"
"fmt"
"sync"
"github.com/google/btree"
"github.com/pingcap-incubator/tinykv/kv/raftstore/util"
"github.com/pingcap-incubator/tinykv/kv/util/engine_util"
"github.com/pingcap-incubator/tinykv/log"
"github.com/pingcap-incubator/tinykv/proto/pkg/eraftpb"
"github.com/pingcap-incubator/tinykv/proto/pkg/metapb"
"github.com/pingcap-incubator/tinykv/proto/pkg/schedulerpb"
"github.com/pingcap/errors"
)
var _ btree.Item = ®ionItem{}
type regionItem struct {
region metapb.Region
}
// Less returns true if the region start key is less than the other.
func (r *regionItem) Less(other btree.Item) bool {
left := r.region.GetStartKey()
right := other.(*regionItem).region.GetStartKey()
return bytes.Compare(left, right) < 0
}
func (r *regionItem) Contains(key []byte) bool {
start, end := r.region.GetStartKey(), r.region.GetEndKey()
return bytes.Compare(key, start) >= 0 && (len(end) == 0 || bytes.Compare(key, end) < 0)
}
type OperatorType int64
const (
OperatorTypeAddPeer = 1
OperatorTypeRemovePeer = 2
OperatorTypeTransferLeader = 3
)
type Operator struct {
Type OperatorType
Data interface{}
}
type OpAddPeer struct {
peer *metapb.Peer
pending bool
}
type OpRemovePeer struct {
peer *metapb.Peer
}
type OpTransferLeader struct {
peer *metapb.Peer
}
type Store struct {
store metapb.Store
heartbeatResponseHandler func(*schedulerpb.RegionHeartbeatResponse)
}
func NewStore(store *metapb.Store) *Store {
return &Store{
store: *store,
heartbeatResponseHandler: nil,
}
}
type MockSchedulerClient struct {
sync.RWMutex
clusterID uint64
meta metapb.Cluster
stores map[uint64]*Store
regionsRange *btree.BTree // key -> region
regionsKey map[uint64][]byte // regionID -> startKey
baseID uint64
operators map[uint64]*Operator
leaders map[uint64]*metapb.Peer // regionID -> peer
pendingPeers map[uint64]*metapb.Peer // peerID -> peer
bootstrapped bool
}
func NewMockSchedulerClient(clusterID uint64, baseID uint64) *MockSchedulerClient {
return &MockSchedulerClient{
clusterID: clusterID,
meta: metapb.Cluster{
Id: clusterID,
},
stores: make(map[uint64]*Store),
regionsRange: btree.New(2),
regionsKey: make(map[uint64][]byte),
baseID: baseID,
operators: make(map[uint64]*Operator),
leaders: make(map[uint64]*metapb.Peer),
pendingPeers: make(map[uint64]*metapb.Peer),
}
}
// Implement SchedulerClient interface
func (m *MockSchedulerClient) GetClusterID(ctx context.Context) uint64 {
m.RLock()
defer m.RUnlock()
return m.clusterID
}
func (m *MockSchedulerClient) AllocID(ctx context.Context) (uint64, error) {
m.Lock()
defer m.Unlock()
ret := m.baseID
m.baseID++
return ret, nil
}
func (m *MockSchedulerClient) Bootstrap(ctx context.Context, store *metapb.Store) (*schedulerpb.BootstrapResponse, error) {
m.Lock()
defer m.Unlock()
resp := &schedulerpb.BootstrapResponse{
Header: &schedulerpb.ResponseHeader{ClusterId: m.clusterID},
}
if m.bootstrapped == true || len(m.regionsKey) != 0 {
m.bootstrapped = true
resp.Header.Error = &schedulerpb.Error{
Type: schedulerpb.ErrorType_ALREADY_BOOTSTRAPPED,
Message: "cluster is already bootstrapped",
}
return resp, nil
}
m.stores[store.GetId()] = NewStore(store)
m.bootstrapped = true
return resp, nil
}
func (m *MockSchedulerClient) IsBootstrapped(ctx context.Context) (bool, error) {
m.RLock()
defer m.RUnlock()
return m.bootstrapped, nil
}
func (m *MockSchedulerClient) checkBootstrap() error {
if bootstrapped, _ := m.IsBootstrapped(context.TODO()); !bootstrapped {
return errors.New("not bootstrapped")
}
return nil
}
func (m *MockSchedulerClient) PutStore(ctx context.Context, store *metapb.Store) error {
if err := m.checkBootstrap(); err != nil {
return err
}
m.Lock()
defer m.Unlock()
s := NewStore(store)
m.stores[store.GetId()] = s
return nil
}
func (m *MockSchedulerClient) GetStore(ctx context.Context, storeID uint64) (*metapb.Store, error) {
if err := m.checkBootstrap(); err != nil {
return nil, err
}
m.RLock()
defer m.RUnlock()
s, ok := m.stores[storeID]
if !ok {
return nil, errors.Errorf("store %d not found", storeID)
}
return &s.store, nil
}
func (m *MockSchedulerClient) GetRegion(ctx context.Context, key []byte) (*metapb.Region, *metapb.Peer, error) {
if err := m.checkBootstrap(); err != nil {
return nil, nil, err
}
m.RLock()
defer m.RUnlock()
region, leader := m.getRegionLocked(key)
return region, leader, nil
}
func (m *MockSchedulerClient) getRegionLocked(key []byte) (*metapb.Region, *metapb.Peer) {
result := m.findRegion(key)
if result == nil {
return nil, nil
}
leader := m.leaders[result.region.GetId()]
return &result.region, leader
}
func (m *MockSchedulerClient) GetRegionByID(ctx context.Context, regionID uint64) (*metapb.Region, *metapb.Peer, error) {
if err := m.checkBootstrap(); err != nil {
return nil, nil, err
}
m.RLock()
defer m.RUnlock()
return m.getRegionByIDLocked(regionID)
}
func (m *MockSchedulerClient) getRegionByIDLocked(regionID uint64) (*metapb.Region, *metapb.Peer, error) {
startKey := m.regionsKey[regionID]
region, leader := m.getRegionLocked(startKey)
return region, leader, nil
}
func (m *MockSchedulerClient) AskSplit(ctx context.Context, region *metapb.Region) (*schedulerpb.AskSplitResponse, error) {
resp := new(schedulerpb.AskSplitResponse)
resp.Header = &schedulerpb.ResponseHeader{ClusterId: m.clusterID}
curRegion, _, err := m.GetRegionByID(ctx, region.GetId())
if err != nil {
return resp, err
}
if util.IsEpochStale(region.RegionEpoch, curRegion.RegionEpoch) {
return resp, errors.New("epoch is stale")
}
id, _ := m.AllocID(ctx)
resp.NewRegionId = id
for range region.GetPeers() {
id, _ := m.AllocID(ctx)
resp.NewPeerIds = append(resp.NewPeerIds, id)
}
return resp, nil
}
func (m *MockSchedulerClient) StoreHeartbeat(ctx context.Context, stats *schedulerpb.StoreStats) error {
if err := m.checkBootstrap(); err != nil {
return err
}
// nothing need to do
return nil
}
func (m *MockSchedulerClient) RegionHeartbeat(req *schedulerpb.RegionHeartbeatRequest) error {
if err := m.checkBootstrap(); err != nil {
return err
}
m.Lock()
defer m.Unlock()
regionID := req.Region.GetId()
for _, p := range req.Region.GetPeers() {
delete(m.pendingPeers, p.GetId())
}
for _, p := range req.GetPendingPeers() {
m.pendingPeers[p.GetId()] = p
}
m.leaders[regionID] = req.Leader
if err := m.handleHeartbeatVersion(req.Region); err != nil {
return err
}
if err := m.handleHeartbeatConfVersion(req.Region); err != nil {
return err
}
resp := &schedulerpb.RegionHeartbeatResponse{
Header: &schedulerpb.ResponseHeader{ClusterId: m.clusterID},
RegionId: regionID,
RegionEpoch: req.Region.GetRegionEpoch(),
TargetPeer: req.Leader,
}
if op := m.operators[regionID]; op != nil {
if m.tryFinished(op, req.Region, req.Leader) {
delete(m.operators, regionID)
} else {
m.makeRegionHeartbeatResponse(op, resp)
}
log.Debugf("[region %d] schedule %v", regionID, op)
}
store := m.stores[req.Leader.GetStoreId()]
store.heartbeatResponseHandler(resp)
return nil
}
func (m *MockSchedulerClient) handleHeartbeatVersion(region *metapb.Region) error {
if engine_util.ExceedEndKey(region.GetStartKey(), region.GetEndKey()) {
panic("start key > end key")
}
for {
searchRegion, _ := m.getRegionLocked(region.GetStartKey())
if searchRegion == nil {
m.addRegionLocked(region)
return nil
} else {
if bytes.Equal(searchRegion.GetStartKey(), region.GetStartKey()) &&
bytes.Equal(searchRegion.GetEndKey(), region.GetEndKey()) {
// the two regions' range are same, must check epoch
if util.IsEpochStale(region.RegionEpoch, searchRegion.RegionEpoch) {
return errors.New("epoch is stale")
}
if searchRegion.RegionEpoch.Version < region.RegionEpoch.Version {
m.removeRegionLocked(searchRegion)
m.addRegionLocked(region)
}
return nil
}
if engine_util.ExceedEndKey(searchRegion.GetStartKey(), region.GetEndKey()) {
// No range covers [start, end) now, insert directly.
m.addRegionLocked(region)
return nil
} else {
// overlap, remove old, insert new.
// E.g, 1 [a, c) -> 1 [a, b) + 2 [b, c), either new 1 or 2 reports, the region
// is overlapped with origin [a, c).
if region.GetRegionEpoch().GetVersion() <= searchRegion.GetRegionEpoch().GetVersion() {
return errors.New("epoch is stale")
}
m.removeRegionLocked(searchRegion)
}
}
}
}
func (m *MockSchedulerClient) handleHeartbeatConfVersion(region *metapb.Region) error {
searchRegion, _ := m.getRegionLocked(region.GetStartKey())
if util.IsEpochStale(region.RegionEpoch, searchRegion.RegionEpoch) {
return errors.New("epoch is stale")
}
regionPeerLen := len(region.GetPeers())
searchRegionPeerLen := len(searchRegion.GetPeers())
if region.RegionEpoch.ConfVer > searchRegion.RegionEpoch.ConfVer {
// If ConfVer changed, TinyKV has added/removed one peer already.
// So scheduler and TinyKV can't have same peer count and can only have
// only one different peer.
if searchRegionPeerLen > regionPeerLen {
if searchRegionPeerLen-regionPeerLen != 1 {
panic("should only one conf change")
}
fmt.Println(searchRegion, region)
if len(GetDiffPeers(searchRegion, region)) != 1 {
panic("should only one different peer")
}
if len(GetDiffPeers(region, searchRegion)) != 0 {
panic("should include all peers")
}
} else if searchRegionPeerLen < regionPeerLen {
if regionPeerLen-searchRegionPeerLen != 1 {
panic("should only one conf change")
}
if len(GetDiffPeers(region, searchRegion)) != 1 {
panic("should only one different peer")
}
if len(GetDiffPeers(searchRegion, region)) != 0 {
panic("should include all peers")
}
} else {
MustSamePeers(searchRegion, region)
if searchRegion.RegionEpoch.ConfVer+1 != region.RegionEpoch.ConfVer {
panic("unmatched conf version")
}
if searchRegion.RegionEpoch.Version+1 != region.RegionEpoch.Version {
panic("unmatched version")
}
}
// update the region.
if m.regionsRange.ReplaceOrInsert(®ionItem{region: *region}) == nil {
panic("update inexistent region ")
}
} else {
MustSamePeers(searchRegion, region)
}
return nil
}
func (m *MockSchedulerClient) tryFinished(op *Operator, region *metapb.Region, leader *metapb.Peer) bool {
switch op.Type {
case OperatorTypeAddPeer:
add := op.Data.(OpAddPeer)
if !add.pending {
for _, p := range region.GetPeers() {
if add.peer.GetId() == p.GetId() {
add.pending = true
} else {
// TinyKV rejects AddNode.
return false
}
}
} else {
_, found := m.pendingPeers[add.peer.GetId()]
return !found
}
case OperatorTypeRemovePeer:
remove := op.Data.(OpRemovePeer)
for _, p := range region.GetPeers() {
if remove.peer.GetId() == p.GetId() {
return false
}
}
return true
case OperatorTypeTransferLeader:
transfer := op.Data.(OpTransferLeader)
return leader.GetId() == transfer.peer.GetId()
}
panic("unreachable")
}
func (m *MockSchedulerClient) makeRegionHeartbeatResponse(op *Operator, resp *schedulerpb.RegionHeartbeatResponse) {
switch op.Type {
case OperatorTypeAddPeer:
add := op.Data.(OpAddPeer)
if !add.pending {
resp.ChangePeer = &schedulerpb.ChangePeer{
ChangeType: eraftpb.ConfChangeType_AddNode,
Peer: add.peer,
}
}
case OperatorTypeRemovePeer:
remove := op.Data.(OpRemovePeer)
resp.ChangePeer = &schedulerpb.ChangePeer{
ChangeType: eraftpb.ConfChangeType_RemoveNode,
Peer: remove.peer,
}
case OperatorTypeTransferLeader:
transfer := op.Data.(OpTransferLeader)
resp.TransferLeader = &schedulerpb.TransferLeader{
Peer: transfer.peer,
}
}
}
func (m *MockSchedulerClient) SetRegionHeartbeatResponseHandler(storeID uint64, h func(*schedulerpb.RegionHeartbeatResponse)) {
if h == nil {
h = func(*schedulerpb.RegionHeartbeatResponse) {}
}
m.Lock()
defer m.Unlock()
store := m.stores[storeID]
store.heartbeatResponseHandler = h
}
func (m *MockSchedulerClient) Close() {
// do nothing
}
func (m *MockSchedulerClient) findRegion(key []byte) *regionItem {
item := ®ionItem{region: metapb.Region{StartKey: key}}
var result *regionItem
m.regionsRange.DescendLessOrEqual(item, func(i btree.Item) bool {
result = i.(*regionItem)
return false
})
if result == nil || !result.Contains(key) {
return nil
}
return result
}
func (m *MockSchedulerClient) addRegionLocked(region *metapb.Region) {
m.regionsKey[region.GetId()] = region.GetStartKey()
m.regionsRange.ReplaceOrInsert(®ionItem{region: *region})
}
func (m *MockSchedulerClient) removeRegionLocked(region *metapb.Region) {
delete(m.regionsKey, region.GetId())
result := m.findRegion(region.GetStartKey())
if result == nil || result.region.GetId() != region.GetId() {
return
}
m.regionsRange.Delete(result)
}
// Extra API for tests
func (m *MockSchedulerClient) AddPeer(regionID uint64, peer *metapb.Peer) {
m.scheduleOperator(regionID, &Operator{
Type: OperatorTypeAddPeer,
Data: OpAddPeer{
peer: peer,
pending: false,
},
})
}
func (m *MockSchedulerClient) RemovePeer(regionID uint64, peer *metapb.Peer) {
m.scheduleOperator(regionID, &Operator{
Type: OperatorTypeRemovePeer,
Data: OpRemovePeer{
peer: peer,
},
})
}
func (m *MockSchedulerClient) TransferLeader(regionID uint64, peer *metapb.Peer) {
m.scheduleOperator(regionID, &Operator{
Type: OperatorTypeTransferLeader,
Data: OpTransferLeader{
peer: peer,
},
})
}
func (m *MockSchedulerClient) getRandomRegion() *metapb.Region {
m.RLock()
defer m.RUnlock()
for regionID := range m.leaders {
region, _, _ := m.getRegionByIDLocked(regionID)
return region
}
return nil
}
func (m *MockSchedulerClient) scheduleOperator(regionID uint64, op *Operator) {
m.Lock()
defer m.Unlock()
m.operators[regionID] = op
}
// Utilities
func MustSamePeers(left *metapb.Region, right *metapb.Region) {
if len(left.GetPeers()) != len(right.GetPeers()) {
panic("unmatched peers length")
}
for _, p := range left.GetPeers() {
if FindPeer(right, p.GetStoreId()) == nil {
panic("not found the peer")
}
}
}
func GetDiffPeers(left *metapb.Region, right *metapb.Region) []*metapb.Peer {
peers := make([]*metapb.Peer, 0, 1)
for _, p := range left.GetPeers() {
if FindPeer(right, p.GetStoreId()) == nil {
peers = append(peers, p)
}
}
return peers
}
func FindPeer(region *metapb.Region, storeID uint64) *metapb.Peer {
for _, p := range region.GetPeers() {
if p.GetStoreId() == storeID {
return p
}
}
return nil
}