forked from tikv/pd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
grant_leader.go
90 lines (78 loc) · 2.83 KB
/
grant_leader.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
// Copyright 2017 PingCAP, Inc.
//
// 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 schedulers
import (
"fmt"
"strconv"
"time"
"github.com/juju/errors"
"github.com/pingcap/pd/server/core"
"github.com/pingcap/pd/server/schedule"
)
func init() {
schedule.RegisterScheduler("grant-leader", func(limiter *schedule.Limiter, args []string) (schedule.Scheduler, error) {
if len(args) != 1 {
return nil, errors.New("grant-leader needs 1 argument")
}
id, err := strconv.ParseUint(args[0], 10, 64)
if err != nil {
return nil, errors.Trace(err)
}
return newGrantLeaderScheduler(limiter, id), nil
})
}
const scheduleInterval = time.Millisecond * 10
// grantLeaderScheduler transfers all leaders to peers in the store.
type grantLeaderScheduler struct {
*baseScheduler
name string
storeID uint64
}
// newGrantLeaderScheduler creates an admin scheduler that transfers all leaders
// to a store.
func newGrantLeaderScheduler(limiter *schedule.Limiter, storeID uint64) schedule.Scheduler {
base := newBaseScheduler(limiter)
return &grantLeaderScheduler{
baseScheduler: base,
name: fmt.Sprintf("grant-leader-scheduler-%d", storeID),
storeID: storeID,
}
}
func (s *grantLeaderScheduler) GetName() string {
return s.name
}
func (s *grantLeaderScheduler) GetType() string {
return "grant-leader"
}
func (s *grantLeaderScheduler) Prepare(cluster schedule.Cluster) error {
return errors.Trace(cluster.BlockStore(s.storeID))
}
func (s *grantLeaderScheduler) Cleanup(cluster schedule.Cluster) {
cluster.UnblockStore(s.storeID)
}
func (s *grantLeaderScheduler) IsScheduleAllowed(cluster schedule.Cluster) bool {
return s.limiter.OperatorCount(schedule.OpLeader) < cluster.GetLeaderScheduleLimit()
}
func (s *grantLeaderScheduler) Schedule(cluster schedule.Cluster, opInfluence schedule.OpInfluence) []*schedule.Operator {
schedulerCounter.WithLabelValues(s.GetName(), "schedule").Inc()
region := cluster.RandFollowerRegion(s.storeID, core.HealthRegion())
if region == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no_follower").Inc()
return nil
}
schedulerCounter.WithLabelValues(s.GetName(), "new_operator").Inc()
step := schedule.TransferLeader{FromStore: region.Leader.GetStoreId(), ToStore: s.storeID}
op := schedule.NewOperator("grant-leader", region.GetId(), region.GetRegionEpoch(), schedule.OpLeader, step)
op.SetPriorityLevel(core.HighPriority)
return []*schedule.Operator{op}
}