97 lines
3.2 KiB
Go
97 lines
3.2 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
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,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package core
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/golang/glog"
|
|
"k8s.io/autoscaler/cluster-autoscaler/cloudprovider"
|
|
"k8s.io/autoscaler/cluster-autoscaler/config/dynamic"
|
|
"k8s.io/autoscaler/cluster-autoscaler/metrics"
|
|
"k8s.io/autoscaler/cluster-autoscaler/utils/errors"
|
|
)
|
|
|
|
// DynamicAutoscaler is a variant of autoscaler which supports dynamic reconfiguration at runtime
|
|
type DynamicAutoscaler struct {
|
|
autoscaler Autoscaler
|
|
autoscalerBuilder AutoscalerBuilder
|
|
configFetcher dynamic.ConfigFetcher
|
|
}
|
|
|
|
// NewDynamicAutoscaler builds a DynamicAutoscaler from required parameters
|
|
func NewDynamicAutoscaler(autoscalerBuilder AutoscalerBuilder, configFetcher dynamic.ConfigFetcher) (*DynamicAutoscaler, errors.AutoscalerError) {
|
|
autoscaler, err := autoscalerBuilder.Build()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &DynamicAutoscaler{
|
|
autoscaler: autoscaler,
|
|
autoscalerBuilder: autoscalerBuilder,
|
|
configFetcher: configFetcher,
|
|
}, nil
|
|
}
|
|
|
|
// CleanUp does the work required before all the iterations of a dynamic autoscaler run
|
|
func (a *DynamicAutoscaler) CleanUp() {
|
|
a.autoscaler.CleanUp()
|
|
}
|
|
|
|
// CloudProvider returns the cloud provider associated to this autoscaler
|
|
func (a *DynamicAutoscaler) CloudProvider() cloudprovider.CloudProvider {
|
|
return a.autoscaler.CloudProvider()
|
|
}
|
|
|
|
// ExitCleanUp cleans-up after autoscaler, so no mess remains after process termination.
|
|
func (a *DynamicAutoscaler) ExitCleanUp() {
|
|
a.autoscaler.ExitCleanUp()
|
|
}
|
|
|
|
// RunOnce represents a single iteration of a dynamic autoscaler inside the CA's control-loop
|
|
func (a *DynamicAutoscaler) RunOnce(currentTime time.Time) errors.AutoscalerError {
|
|
reconfigureStart := time.Now()
|
|
metrics.UpdateLastTime(metrics.Reconfigure, reconfigureStart)
|
|
if err := a.Reconfigure(); err != nil {
|
|
glog.Errorf("Failed to reconfigure : %v", err)
|
|
}
|
|
metrics.UpdateDurationFromStart(metrics.Reconfigure, reconfigureStart)
|
|
return a.autoscaler.RunOnce(currentTime)
|
|
}
|
|
|
|
// Reconfigure this dynamic autoscaler if the configmap is updated
|
|
func (a *DynamicAutoscaler) Reconfigure() error {
|
|
var updatedConfig *dynamic.Config
|
|
var err error
|
|
|
|
if updatedConfig, err = a.configFetcher.FetchConfigIfUpdated(); err != nil {
|
|
return fmt.Errorf("failed to fetch updated config: %v", err)
|
|
}
|
|
|
|
if updatedConfig != nil {
|
|
// For safety, any config change should stop and recreate all the stuff running in CA hence recreating all the Autoscaler instance here
|
|
// See https://github.com/kubernetes/contrib/pull/2226#discussion_r94126064
|
|
a.autoscaler, err = a.autoscalerBuilder.SetDynamicConfig(*updatedConfig).Build()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
glog.V(4).Infof("Dynamic reconfiguration finished: updatedConfig=%v", updatedConfig)
|
|
}
|
|
|
|
return nil
|
|
}
|