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gc_service.go
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gc_service.go
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// Copyright 2023 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 server
import (
"context"
"encoding/json"
"fmt"
"math"
"path"
"strings"
"github.com/pingcap/kvproto/pkg/pdpb"
"github.com/pingcap/log"
"github.com/tikv/pd/pkg/errs"
"github.com/tikv/pd/pkg/storage/endpoint"
"github.com/tikv/pd/pkg/utils/etcdutil"
"github.com/tikv/pd/pkg/utils/tsoutil"
"go.etcd.io/etcd/clientv3"
"go.uber.org/zap"
"google.golang.org/grpc"
)
// GetGCSafePointV2 return gc safe point for the given keyspace.
func (s *GrpcServer) GetGCSafePointV2(ctx context.Context, request *pdpb.GetGCSafePointV2Request) (*pdpb.GetGCSafePointV2Response, error) {
fn := func(ctx context.Context, client *grpc.ClientConn) (any, error) {
return pdpb.NewPDClient(client).GetGCSafePointV2(ctx, request)
}
if rsp, err := s.unaryMiddleware(ctx, request, fn); err != nil {
return nil, err
} else if rsp != nil {
return rsp.(*pdpb.GetGCSafePointV2Response), err
}
safePoint, err := s.safePointV2Manager.LoadGCSafePoint(request.GetKeyspaceId())
if err != nil {
return &pdpb.GetGCSafePointV2Response{
Header: s.wrapErrorToHeader(pdpb.ErrorType_UNKNOWN, err.Error()),
}, err
}
return &pdpb.GetGCSafePointV2Response{
Header: s.header(),
SafePoint: safePoint.SafePoint,
}, nil
}
// UpdateGCSafePointV2 update gc safe point for the given keyspace.
func (s *GrpcServer) UpdateGCSafePointV2(ctx context.Context, request *pdpb.UpdateGCSafePointV2Request) (*pdpb.UpdateGCSafePointV2Response, error) {
fn := func(ctx context.Context, client *grpc.ClientConn) (any, error) {
return pdpb.NewPDClient(client).UpdateGCSafePointV2(ctx, request)
}
if rsp, err := s.unaryMiddleware(ctx, request, fn); err != nil {
return nil, err
} else if rsp != nil {
return rsp.(*pdpb.UpdateGCSafePointV2Response), err
}
newSafePoint := request.GetSafePoint()
oldSafePoint, err := s.safePointV2Manager.UpdateGCSafePoint(&endpoint.GCSafePointV2{
KeyspaceID: request.KeyspaceId,
SafePoint: request.SafePoint,
})
if err != nil {
return nil, err
}
if newSafePoint > oldSafePoint.SafePoint {
log.Info("updated gc safe point",
zap.Uint64("safe-point", newSafePoint),
zap.Uint32("keyspace-id", request.GetKeyspaceId()))
} else if newSafePoint < oldSafePoint.SafePoint {
log.Warn("trying to update gc safe point",
zap.Uint64("old-safe-point", oldSafePoint.SafePoint),
zap.Uint64("new-safe-point", newSafePoint),
zap.Uint32("keyspace-id", request.GetKeyspaceId()))
newSafePoint = oldSafePoint.SafePoint
}
return &pdpb.UpdateGCSafePointV2Response{
Header: s.header(),
NewSafePoint: newSafePoint,
}, nil
}
// UpdateServiceSafePointV2 update service safe point for the given keyspace.
func (s *GrpcServer) UpdateServiceSafePointV2(ctx context.Context, request *pdpb.UpdateServiceSafePointV2Request) (*pdpb.UpdateServiceSafePointV2Response, error) {
fn := func(ctx context.Context, client *grpc.ClientConn) (any, error) {
return pdpb.NewPDClient(client).UpdateServiceSafePointV2(ctx, request)
}
if rsp, err := s.unaryMiddleware(ctx, request, fn); err != nil {
return nil, err
} else if rsp != nil {
return rsp.(*pdpb.UpdateServiceSafePointV2Response), err
}
nowTSO, err := s.getGlobalTSO(ctx)
if err != nil {
return nil, err
}
now, _ := tsoutil.ParseTimestamp(nowTSO)
var minServiceSafePoint *endpoint.ServiceSafePointV2
if request.Ttl < 0 {
minServiceSafePoint, err = s.safePointV2Manager.RemoveServiceSafePoint(request.GetKeyspaceId(), string(request.GetServiceId()), now)
} else {
serviceSafePoint := &endpoint.ServiceSafePointV2{
KeyspaceID: request.GetKeyspaceId(),
ServiceID: string(request.GetServiceId()),
ExpiredAt: now.Unix() + request.GetTtl(),
SafePoint: request.GetSafePoint(),
}
// Fix possible overflow.
if math.MaxInt64-now.Unix() <= request.GetTtl() {
serviceSafePoint.ExpiredAt = math.MaxInt64
}
minServiceSafePoint, err = s.safePointV2Manager.UpdateServiceSafePoint(serviceSafePoint, now)
}
if err != nil {
return nil, err
}
return &pdpb.UpdateServiceSafePointV2Response{
Header: s.header(),
ServiceId: []byte(minServiceSafePoint.ServiceID),
Ttl: minServiceSafePoint.ExpiredAt - now.Unix(),
MinSafePoint: minServiceSafePoint.SafePoint,
}, nil
}
// WatchGCSafePointV2 watch keyspaces gc safe point changes.
func (s *GrpcServer) WatchGCSafePointV2(request *pdpb.WatchGCSafePointV2Request, stream pdpb.PD_WatchGCSafePointV2Server) error {
ctx, cancel := context.WithCancel(s.Context())
defer cancel()
revision := request.GetRevision()
// If the revision is compacted, will meet required revision has been compacted error.
// - If required revision < CompactRevision, we need to reload all configs to avoid losing data.
// - If required revision >= CompactRevision, just keep watching.
// Use WithPrevKV() to get the previous key-value pair when get Delete Event.
watchChan := s.client.Watch(ctx, path.Join(s.rootPath, endpoint.GCSafePointV2Prefix()), clientv3.WithRev(revision), clientv3.WithPrefix())
for {
select {
case <-ctx.Done():
return nil
case res := <-watchChan:
if res.Err() != nil {
var resp pdpb.WatchGCSafePointV2Response
if revision < res.CompactRevision {
resp.Header = s.wrapErrorToHeader(pdpb.ErrorType_DATA_COMPACTED,
fmt.Sprintf("required watch revision: %d is smaller than current compact/min revision %d.", revision, res.CompactRevision))
} else {
resp.Header = s.wrapErrorToHeader(pdpb.ErrorType_UNKNOWN,
fmt.Sprintf("watch channel meet other error %s.", res.Err().Error()))
}
if err := stream.Send(&resp); err != nil {
return err
}
// Err() indicates that this WatchResponse holds a channel-closing error.
return res.Err()
}
revision = res.Header.GetRevision()
safePointEvents := make([]*pdpb.SafePointEvent, 0, len(res.Events))
for _, event := range res.Events {
gcSafePoint := &endpoint.GCSafePointV2{}
if err := json.Unmarshal(event.Kv.Value, gcSafePoint); err != nil {
return err
}
safePointEvents = append(safePointEvents, &pdpb.SafePointEvent{
KeyspaceId: gcSafePoint.KeyspaceID,
SafePoint: gcSafePoint.SafePoint,
Type: pdpb.EventType(event.Type),
})
}
if len(safePointEvents) > 0 {
if err := stream.Send(&pdpb.WatchGCSafePointV2Response{Header: s.header(), Events: safePointEvents, Revision: res.Header.GetRevision()}); err != nil {
return err
}
}
}
}
}
// GetAllGCSafePointV2 return all gc safe point v2.
func (s *GrpcServer) GetAllGCSafePointV2(ctx context.Context, request *pdpb.GetAllGCSafePointV2Request) (*pdpb.GetAllGCSafePointV2Response, error) {
fn := func(ctx context.Context, client *grpc.ClientConn) (any, error) {
return pdpb.NewPDClient(client).GetAllGCSafePointV2(ctx, request)
}
if rsp, err := s.unaryMiddleware(ctx, request, fn); err != nil {
return nil, err
} else if rsp != nil {
return rsp.(*pdpb.GetAllGCSafePointV2Response), err
}
startkey := endpoint.GCSafePointV2Prefix()
endkey := clientv3.GetPrefixRangeEnd(startkey)
_, values, revision, err := s.loadRangeFromETCD(startkey, endkey)
gcSafePoints := make([]*pdpb.GCSafePointV2, 0, len(values))
for _, value := range values {
jsonGcSafePoint := &endpoint.GCSafePointV2{}
if err = json.Unmarshal([]byte(value), jsonGcSafePoint); err != nil {
return nil, errs.ErrJSONUnmarshal.Wrap(err).GenWithStackByCause()
}
gcSafePoint := &pdpb.GCSafePointV2{
KeyspaceId: jsonGcSafePoint.KeyspaceID,
GcSafePoint: jsonGcSafePoint.SafePoint,
}
log.Debug("get all gc safe point v2",
zap.Uint32("keyspace-id", jsonGcSafePoint.KeyspaceID),
zap.Uint64("gc-safe-point", jsonGcSafePoint.SafePoint))
gcSafePoints = append(gcSafePoints, gcSafePoint)
}
if err != nil {
return &pdpb.GetAllGCSafePointV2Response{
Header: s.wrapErrorToHeader(pdpb.ErrorType_UNKNOWN, err.Error()),
}, err
}
return &pdpb.GetAllGCSafePointV2Response{
Header: s.header(),
GcSafePoints: gcSafePoints,
Revision: revision,
}, nil
}
func (s *GrpcServer) loadRangeFromETCD(startKey, endKey string) ([]string, []string, int64, error) {
startKey = strings.Join([]string{s.rootPath, startKey}, "/")
var opOption []clientv3.OpOption
if endKey == "\x00" {
opOption = append(opOption, clientv3.WithPrefix())
} else {
endKey = strings.Join([]string{s.rootPath, endKey}, "/")
opOption = append(opOption, clientv3.WithRange(endKey))
}
resp, err := etcdutil.EtcdKVGet(s.client, startKey, opOption...)
if err != nil {
return nil, nil, 0, err
}
keys := make([]string, 0, len(resp.Kvs))
values := make([]string, 0, len(resp.Kvs))
for _, item := range resp.Kvs {
keys = append(keys, strings.TrimPrefix(strings.TrimPrefix(string(item.Key), s.rootPath), "/"))
values = append(values, string(item.Value))
}
return keys, values, resp.Header.Revision, nil
}