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base_scheduler.go
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base_scheduler.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 (
"time"
"github.com/pingcap/pd/server/schedule"
log "github.com/sirupsen/logrus"
)
// options for interval of schedulers
const (
MaxScheduleInterval = time.Minute
MinScheduleInterval = time.Millisecond * 10
MinSlowScheduleInterval = time.Second * 3
ScheduleIntervalFactor = 1.3
)
type intervalGrowthType int
const (
exponentailGrowth intervalGrowthType = iota
linearGrowth
zeroGrowth
)
func intervalGrow(x time.Duration, maxInterval time.Duration, typ intervalGrowthType) time.Duration {
switch typ {
case exponentailGrowth:
return minDuration(time.Duration(float64(x)*ScheduleIntervalFactor), maxInterval)
case linearGrowth:
return minDuration(x+MinSlowScheduleInterval, maxInterval)
case zeroGrowth:
return x
default:
log.Fatal("unKnow interval growth type")
}
return 0
}
type baseScheduler struct {
limiter *schedule.Limiter
}
func newBaseScheduler(limiter *schedule.Limiter) *baseScheduler {
return &baseScheduler{limiter: limiter}
}
func (s *baseScheduler) GetMinInterval() time.Duration {
return MinScheduleInterval
}
func (s *baseScheduler) GetNextInterval(interval time.Duration) time.Duration {
return intervalGrow(interval, MaxScheduleInterval, exponentailGrowth)
}
func (s *baseScheduler) Prepare(cluster schedule.Cluster) error { return nil }
func (s *baseScheduler) Cleanup(cluster schedule.Cluster) {}