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grant_leader.go
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grant_leader.go
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// 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"
"github.com/pingcap/pd/server/core"
"github.com/pingcap/pd/server/schedule"
"github.com/pkg/errors"
)
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.WithStack(err)
}
return newGrantLeaderScheduler(limiter, id), nil
})
}
// 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 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.GetLeader().GetStoreId(), ToStore: s.storeID}
op := schedule.NewOperator("grant-leader", region.GetID(), region.GetRegionEpoch(), schedule.OpLeader, step)
op.SetPriorityLevel(core.HighPriority)
return []*schedule.Operator{op}
}