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interface.go
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interface.go
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// Copyright 2020 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 scheduler
import (
"github.com/pingcap/log"
"github.com/tikv/migration/cdc/cdc/model"
)
// Scheduler is an abstraction for anything that provide the schedule keyspan feature
type Scheduler interface {
// ResetWorkloads resets the workloads info of the capture
ResetWorkloads(captureID model.CaptureID, workloads model.TaskWorkload)
// AlignCapture makes sure that the workloads of the capture is matched with the specified captureIDs
AlignCapture(captureIDs map[model.CaptureID]struct{})
// Skewness returns the skewness
Skewness() float64
// CalRebalanceOperates calculates the rebalance operates
// returns * the skewness after rebalance
// * the move jobs need by rebalance
CalRebalanceOperates(targetSkewness float64) (
skewness float64, moveKeySpanJobs map[model.KeySpanID]*model.MoveKeySpanJob)
// DistributeKeySpans distributes the new keyspans to the captures
// returns the operations of the new keyspans
DistributeKeySpans(keyspanIDs map[model.KeySpanID]model.Ts) map[model.CaptureID]map[model.KeySpanID]*model.KeySpanOperation
}
// NewScheduler creates a new Scheduler
func NewScheduler(tp string) Scheduler {
switch tp {
case "keyspan-number":
return newKeySpanNumberScheduler()
default:
log.Info("invalid scheduler type, using default scheduler")
return newKeySpanNumberScheduler()
}
}