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scatter_range.go
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/
scatter_range.go
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// Copyright 2018 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"
"net/url"
"strings"
"github.com/pingcap/pd/server/schedule"
"github.com/pkg/errors"
)
func init() {
schedule.RegisterScheduler("scatter-range", func(limiter *schedule.Limiter, args []string) (schedule.Scheduler, error) {
if len(args) != 3 {
return nil, errors.New("should specify the range and the name")
}
startKey, err := url.QueryUnescape(args[0])
if err != nil {
return nil, err
}
endKey, err := url.QueryUnescape(args[1])
if err != nil {
return nil, err
}
name := args[2]
return newScatterRangeScheduler(limiter, []string{startKey, endKey, name}), nil
})
}
type scatterRangeScheduler struct {
*baseScheduler
rangeName string
startKey []byte
endKey []byte
balanceLeader schedule.Scheduler
balanceRegion schedule.Scheduler
}
// newScatterRangeScheduler creates a scheduler that tends to keep leaders on
// each store balanced.
func newScatterRangeScheduler(limiter *schedule.Limiter, args []string) schedule.Scheduler {
base := newBaseScheduler(limiter)
return &scatterRangeScheduler{
baseScheduler: base,
startKey: []byte(args[0]),
endKey: []byte(args[1]),
rangeName: args[2],
balanceLeader: newBalanceLeaderScheduler(limiter),
balanceRegion: newBalanceRegionScheduler(limiter),
}
}
func (l *scatterRangeScheduler) GetName() string {
return fmt.Sprintf("scatter-range-%s", l.rangeName)
}
func (l *scatterRangeScheduler) GetType() string {
return "scatter-range"
}
func (l *scatterRangeScheduler) IsScheduleAllowed(cluster schedule.Cluster) bool {
return l.limiter.OperatorCount(schedule.OpRange) < cluster.GetRegionScheduleLimit()
}
func (l *scatterRangeScheduler) getOperators(opInfuence schedule.OpInfluence) []*schedule.Operator {
var res []*schedule.Operator
ops := opInfuence.GetRegionsInfluence()
for _, op := range ops {
if strings.HasSuffix(op.Desc(), l.rangeName) {
res = append(res, op)
}
}
return res
}
func (l *scatterRangeScheduler) Schedule(cluster schedule.Cluster, opInfluence schedule.OpInfluence) []*schedule.Operator {
schedulerCounter.WithLabelValues(l.GetName(), "schedule").Inc()
c := schedule.GenRangeCluster(cluster, l.startKey, l.endKey)
c.SetTolerantSizeRatio(2)
influence := l.getOperators(opInfluence)
ops := l.balanceLeader.Schedule(c, schedule.NewOpInfluence(influence, cluster))
if len(ops) > 0 {
ops[0].SetDesc(fmt.Sprintf("scatter-range-leader-%s", l.rangeName))
ops[0].AttachKind(schedule.OpRange)
schedulerCounter.WithLabelValues(l.GetName(), "new-leader-operator").Inc()
return ops
}
ops = l.balanceRegion.Schedule(c, schedule.NewOpInfluence(influence, cluster))
if len(ops) > 0 {
ops[0].SetDesc(fmt.Sprintf("scatter-range-region-%s", l.rangeName))
ops[0].AttachKind(schedule.OpRange)
schedulerCounter.WithLabelValues(l.GetName(), "new-region-operator").Inc()
return ops
}
schedulerCounter.WithLabelValues(l.GetName(), "no-need").Inc()
return nil
}