/
checker_controller.go
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/
checker_controller.go
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// Copyright 2019 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 schedule
import (
"context"
"github.com/pingcap/pd/v3/server/core"
"github.com/pingcap/pd/v3/server/schedule/checker"
"github.com/pingcap/pd/v3/server/schedule/operator"
"github.com/pingcap/pd/v3/server/schedule/opt"
"github.com/pingcap/pd/v3/server/schedule/placement"
)
// CheckerController is used to manage all checkers.
type CheckerController struct {
cluster opt.Cluster
opController *OperatorController
learnerChecker *checker.LearnerChecker
replicaChecker *checker.ReplicaChecker
ruleChecker *checker.RuleChecker
mergeChecker *checker.MergeChecker
}
// NewCheckerController create a new CheckerController.
// TODO: isSupportMerge should be removed.
func NewCheckerController(ctx context.Context, cluster opt.Cluster, ruleManager *placement.RuleManager, opController *OperatorController) *CheckerController {
return &CheckerController{
cluster: cluster,
opController: opController,
learnerChecker: checker.NewLearnerChecker(cluster),
replicaChecker: checker.NewReplicaChecker(cluster),
ruleChecker: checker.NewRuleChecker(cluster, ruleManager),
mergeChecker: checker.NewMergeChecker(ctx, cluster),
}
}
// CheckRegion will check the region and add a new operator if needed.
func (c *CheckerController) CheckRegion(region *core.RegionInfo) (bool, []*operator.Operator) { //return checkerIsBusy,ops
// If PD has restarted, it need to check learners added before and promote them.
// Don't check isRaftLearnerEnabled cause it maybe disable learner feature but there are still some learners to promote.
opController := c.opController
checkerIsBusy := true
if c.cluster.IsPlacementRulesEnabled() {
if opController.OperatorCount(operator.OpReplica) < c.cluster.GetReplicaScheduleLimit() {
checkerIsBusy = false
if op := c.ruleChecker.Check(region); op != nil {
return checkerIsBusy, []*operator.Operator{op}
}
}
} else {
if op := c.learnerChecker.Check(region); op != nil {
return false, []*operator.Operator{op}
}
if opController.OperatorCount(operator.OpReplica) < c.cluster.GetReplicaScheduleLimit() {
checkerIsBusy = false
if op := c.replicaChecker.Check(region); op != nil {
return checkerIsBusy, []*operator.Operator{op}
}
}
}
if c.mergeChecker != nil && opController.OperatorCount(operator.OpMerge) < c.cluster.GetMergeScheduleLimit() {
checkerIsBusy = false
if ops := c.mergeChecker.Check(region); ops != nil {
// It makes sure that two operators can be added successfully altogether.
return checkerIsBusy, ops
}
}
return checkerIsBusy, nil
}
// GetMergeChecker returns the merge checker.
func (c *CheckerController) GetMergeChecker() *checker.MergeChecker {
return c.mergeChecker
}