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tso: refactor the tso service (#2803)
Signed-off-by: JmPotato <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| // 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package tso | ||
|
|
||
| import ( | ||
| "sync/atomic" | ||
| "time" | ||
|
|
||
| "github.com/pingcap/errors" | ||
| "github.com/pingcap/failpoint" | ||
| "github.com/pingcap/kvproto/pkg/pdpb" | ||
| "github.com/pingcap/log" | ||
| "github.com/tikv/pd/pkg/errs" | ||
| "github.com/tikv/pd/pkg/typeutil" | ||
| "github.com/tikv/pd/server/election" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| // Allocator is a Timestamp Orcale allocator. | ||
| type Allocator interface { | ||
| // Initialize is used to initialize a TSO allocator. | ||
| // It will synchronize TSO with etcd and initialize the | ||
| // memory for later allocation work. | ||
| Initialize() error | ||
| // UpdateTSO is used to update the TSO in memory and the time window in etcd. | ||
| UpdateTSO() error | ||
| // SetTSO sets the physical part with given tso. It's mainly used for BR restore | ||
| // and can not forcibly set the TSO smaller than now. | ||
| SetTSO(tso uint64) error | ||
| // GenerateTSO is used to generate a given number of TSOs. | ||
| // Make sure you have initialized the TSO allocator before calling. | ||
| GenerateTSO(count uint32) (pdpb.Timestamp, error) | ||
| // Reset is uesed to reset the TSO allocator. | ||
| Reset() | ||
| } | ||
|
|
||
| // GlobalTSOAllocator is the global single point TSO allocator. | ||
| type GlobalTSOAllocator struct { | ||
| // leadership is used to check the current PD server's leadership | ||
| // to determine whether a tso request could be processed and | ||
| // it's stored as *election.Leadership | ||
| leadership atomic.Value | ||
| timestampOracle *timestampOracle | ||
| } | ||
|
|
||
| // NewGlobalTSOAllocator creates a new global TSO allocator. | ||
| func NewGlobalTSOAllocator(leadership *election.Leadership, rootPath string, saveInterval time.Duration, maxResetTSGap func() time.Duration) Allocator { | ||
| gta := &GlobalTSOAllocator{ | ||
| timestampOracle: ×tampOracle{ | ||
| client: leadership.GetClient(), | ||
| rootPath: rootPath, | ||
| saveInterval: saveInterval, | ||
| maxResetTSGap: maxResetTSGap, | ||
| }, | ||
| } | ||
| gta.setLeadership(leadership) | ||
| return gta | ||
| } | ||
|
|
||
| func (gta *GlobalTSOAllocator) getLeadership() *election.Leadership { | ||
| leadership := gta.leadership.Load() | ||
| if leadership == nil { | ||
| return nil | ||
| } | ||
| return leadership.(*election.Leadership) | ||
| } | ||
|
|
||
| func (gta *GlobalTSOAllocator) setLeadership(leadership *election.Leadership) { | ||
| gta.leadership.Store(leadership) | ||
| } | ||
|
|
||
| // Initialize will initialize the created global TSO allocator. | ||
| func (gta *GlobalTSOAllocator) Initialize() error { | ||
| return gta.timestampOracle.SyncTimestamp(gta.getLeadership()) | ||
| } | ||
|
|
||
| // UpdateTSO is used to update the TSO in memory and the time window in etcd. | ||
| func (gta *GlobalTSOAllocator) UpdateTSO() error { | ||
| return gta.timestampOracle.UpdateTimestamp(gta.getLeadership()) | ||
| } | ||
|
|
||
| // SetTSO sets the physical part with given tso. | ||
| func (gta *GlobalTSOAllocator) SetTSO(tso uint64) error { | ||
| return gta.timestampOracle.ResetUserTimestamp(gta.getLeadership(), tso) | ||
| } | ||
|
|
||
| // GenerateTSO is used to generate a given number of TSOs. | ||
| // Make sure you have initialized the TSO allocator before calling. | ||
| func (gta *GlobalTSOAllocator) GenerateTSO(count uint32) (pdpb.Timestamp, error) { | ||
| var resp pdpb.Timestamp | ||
|
|
||
| if count == 0 { | ||
| return resp, errors.New("tso count should be positive") | ||
| } | ||
|
|
||
| maxRetryCount := 10 | ||
| failpoint.Inject("skipRetryGetTS", func() { | ||
| maxRetryCount = 1 | ||
| }) | ||
|
|
||
| for i := 0; i < maxRetryCount; i++ { | ||
| current := (*atomicObject)(atomic.LoadPointer(>a.timestampOracle.TSO)) | ||
| if current == nil || current.physical == typeutil.ZeroTime { | ||
| // If it's leader, maybe SyncTimestamp hasn't completed yet | ||
| if gta.getLeadership().Check() { | ||
| log.Info("sync hasn't completed yet, wait for a while") | ||
| time.Sleep(200 * time.Millisecond) | ||
| continue | ||
| } | ||
| log.Error("invalid timestamp", zap.Any("timestamp", current), zap.Error(errs.ErrInvalidTimestamp.FastGenByArgs())) | ||
| return pdpb.Timestamp{}, errors.New("can not get timestamp, may be not leader") | ||
| } | ||
|
|
||
| resp.Physical = current.physical.UnixNano() / int64(time.Millisecond) | ||
| resp.Logical = atomic.AddInt64(¤t.logical, int64(count)) | ||
| if resp.Logical >= maxLogical { | ||
| log.Error("logical part outside of max logical interval, please check ntp time", | ||
| zap.Reflect("response", resp), | ||
| zap.Int("retry-count", i), zap.Error(errs.ErrLogicOverflow.FastGenByArgs())) | ||
| tsoCounter.WithLabelValues("logical_overflow").Inc() | ||
| time.Sleep(UpdateTimestampStep) | ||
| continue | ||
| } | ||
| // In case lease expired after the first check. | ||
| if !gta.getLeadership().Check() { | ||
| return pdpb.Timestamp{}, errors.New("alloc timestamp failed, lease expired") | ||
| } | ||
| return resp, nil | ||
| } | ||
| return resp, errors.New("can not get timestamp") | ||
| } | ||
|
|
||
| // Reset is uesed to reset the TSO allocator. | ||
| func (gta *GlobalTSOAllocator) Reset() { | ||
| gta.timestampOracle.ResetTimestamp() | ||
| } |
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