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evict_leader.go
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evict_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"
"time"
"github.com/juju/errors"
"github.com/pingcap/pd/server/core"
"github.com/pingcap/pd/server/schedule"
)
func init() {
schedule.RegisterScheduler("evict-leader", func(opt schedule.Options, args []string) (schedule.Scheduler, error) {
if len(args) != 1 {
return nil, errors.New("evict-leader needs 1 argument")
}
id, err := strconv.ParseUint(args[0], 10, 64)
if err != nil {
return nil, errors.Trace(err)
}
return newEvictLeaderScheduler(opt, id), nil
})
}
type evictLeaderScheduler struct {
opt schedule.Options
name string
storeID uint64
selector schedule.Selector
}
// newEvictLeaderScheduler creates an admin scheduler that transfers all leaders
// out of a store.
func newEvictLeaderScheduler(opt schedule.Options, storeID uint64) schedule.Scheduler {
filters := []schedule.Filter{
schedule.NewStateFilter(opt),
schedule.NewHealthFilter(opt),
}
return &evictLeaderScheduler{
opt: opt,
name: fmt.Sprintf("evict-leader-scheduler-%d", storeID),
storeID: storeID,
selector: schedule.NewRandomSelector(filters),
}
}
func (s *evictLeaderScheduler) GetName() string {
return s.name
}
func (s *evictLeaderScheduler) GetType() string {
return "evict-leader"
}
func (s *evictLeaderScheduler) GetInterval() time.Duration {
return schedule.MinScheduleInterval
}
func (s *evictLeaderScheduler) GetResourceKind() core.ResourceKind {
return core.LeaderKind
}
func (s *evictLeaderScheduler) GetResourceLimit() uint64 {
return s.opt.GetLeaderScheduleLimit()
}
func (s *evictLeaderScheduler) Prepare(cluster schedule.Cluster) error {
return errors.Trace(cluster.BlockStore(s.storeID))
}
func (s *evictLeaderScheduler) Cleanup(cluster schedule.Cluster) {
cluster.UnblockStore(s.storeID)
}
func (s *evictLeaderScheduler) Schedule(cluster schedule.Cluster) *schedule.Operator {
schedulerCounter.WithLabelValues(s.GetName(), "schedule").Inc()
region := cluster.RandLeaderRegion(s.storeID)
if region == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no_leader").Inc()
return nil
}
target := s.selector.SelectTarget(cluster.GetFollowerStores(region))
if target == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no_target_store").Inc()
return nil
}
schedulerCounter.WithLabelValues(s.GetName(), "new_operator").Inc()
step := schedule.TransferLeader{FromStore: region.Leader.GetStoreId(), ToStore: target.GetId()}
return schedule.NewOperator("evict-leader", region.GetId(), core.LeaderKind, step)
}