mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-10-19 05:39:51 +00:00
ff3e84ad67
updating kubernetes to 1.28.0 in the main repo. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
130 lines
5.0 KiB
Go
130 lines
5.0 KiB
Go
/*
|
|
Copyright 2021 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 request
|
|
|
|
import (
|
|
"fmt"
|
|
"net/http"
|
|
"time"
|
|
|
|
apirequest "k8s.io/apiserver/pkg/endpoints/request"
|
|
"k8s.io/apiserver/pkg/features"
|
|
utilfeature "k8s.io/apiserver/pkg/util/feature"
|
|
|
|
"k8s.io/klog/v2"
|
|
)
|
|
|
|
// WorkEstimate carries three of the four parameters that determine the work in a request.
|
|
// The fourth parameter is the duration of the initial phase of execution.
|
|
type WorkEstimate struct {
|
|
// InitialSeats is the number of seats occupied while the server is
|
|
// executing this request.
|
|
InitialSeats uint64
|
|
|
|
// FinalSeats is the number of seats occupied at the end,
|
|
// during the AdditionalLatency.
|
|
FinalSeats uint64
|
|
|
|
// AdditionalLatency specifies the additional duration the seats allocated
|
|
// to this request must be reserved after the given request had finished.
|
|
// AdditionalLatency should not have any impact on the user experience, the
|
|
// caller must not experience this additional latency.
|
|
AdditionalLatency time.Duration
|
|
}
|
|
|
|
// MaxSeats returns the maximum number of seats the request occupies over the
|
|
// phases of being served.
|
|
func (we *WorkEstimate) MaxSeats() int {
|
|
if we.InitialSeats >= we.FinalSeats {
|
|
return int(we.InitialSeats)
|
|
}
|
|
|
|
return int(we.FinalSeats)
|
|
}
|
|
|
|
// objectCountGetterFunc represents a function that gets the total
|
|
// number of objects for a given resource.
|
|
type objectCountGetterFunc func(string) (int64, error)
|
|
|
|
// watchCountGetterFunc represents a function that gets the total
|
|
// number of watchers potentially interested in a given request.
|
|
type watchCountGetterFunc func(*apirequest.RequestInfo) int
|
|
|
|
// MaxSeatsFunc represents a function that returns the maximum seats
|
|
// allowed for the work estimator for a given priority level.
|
|
type maxSeatsFunc func(priorityLevelName string) uint64
|
|
|
|
// NewWorkEstimator estimates the work that will be done by a given request,
|
|
// if no WorkEstimatorFunc matches the given request then the default
|
|
// work estimate of 1 seat is allocated to the request.
|
|
func NewWorkEstimator(objectCountFn objectCountGetterFunc, watchCountFn watchCountGetterFunc, config *WorkEstimatorConfig, maxSeatsFn maxSeatsFunc) WorkEstimatorFunc {
|
|
estimator := &workEstimator{
|
|
minimumSeats: config.MinimumSeats,
|
|
maximumSeatsLimit: config.MaximumSeatsLimit,
|
|
listWorkEstimator: newListWorkEstimator(objectCountFn, config, maxSeatsFn),
|
|
mutatingWorkEstimator: newMutatingWorkEstimator(watchCountFn, config, maxSeatsFn),
|
|
}
|
|
return estimator.estimate
|
|
}
|
|
|
|
// WorkEstimatorFunc returns the estimated work of a given request.
|
|
// This function will be used by the Priority & Fairness filter to
|
|
// estimate the work of of incoming requests.
|
|
type WorkEstimatorFunc func(request *http.Request, flowSchemaName, priorityLevelName string) WorkEstimate
|
|
|
|
func (e WorkEstimatorFunc) EstimateWork(r *http.Request, flowSchemaName, priorityLevelName string) WorkEstimate {
|
|
return e(r, flowSchemaName, priorityLevelName)
|
|
}
|
|
|
|
type workEstimator struct {
|
|
// the minimum number of seats a request must occupy
|
|
minimumSeats uint64
|
|
// the default maximum number of seats a request can occupy
|
|
maximumSeatsLimit uint64
|
|
// listWorkEstimator estimates work for list request(s)
|
|
listWorkEstimator WorkEstimatorFunc
|
|
// mutatingWorkEstimator calculates the width of mutating request(s)
|
|
mutatingWorkEstimator WorkEstimatorFunc
|
|
}
|
|
|
|
func (e *workEstimator) estimate(r *http.Request, flowSchemaName, priorityLevelName string) WorkEstimate {
|
|
requestInfo, ok := apirequest.RequestInfoFrom(r.Context())
|
|
if !ok {
|
|
klog.ErrorS(fmt.Errorf("no RequestInfo found in context"), "Failed to estimate work for the request", "URI", r.RequestURI)
|
|
// no RequestInfo should never happen, but to be on the safe side let's return maximumSeats
|
|
return WorkEstimate{InitialSeats: e.maximumSeatsLimit}
|
|
}
|
|
|
|
switch requestInfo.Verb {
|
|
case "list":
|
|
return e.listWorkEstimator.EstimateWork(r, flowSchemaName, priorityLevelName)
|
|
case "watch":
|
|
// WATCH supports `SendInitialEvents` option, which effectively means
|
|
// that is starts with sending of the contents of a corresponding LIST call.
|
|
// From that perspective, given that the watch only consumes APF seats
|
|
// during its initialization (sending init events), its cost should then
|
|
// be computed the same way as for a regular list.
|
|
if utilfeature.DefaultFeatureGate.Enabled(features.WatchList) {
|
|
return e.listWorkEstimator.EstimateWork(r, flowSchemaName, priorityLevelName)
|
|
}
|
|
case "create", "update", "patch", "delete":
|
|
return e.mutatingWorkEstimator.EstimateWork(r, flowSchemaName, priorityLevelName)
|
|
}
|
|
|
|
return WorkEstimate{InitialSeats: e.minimumSeats}
|
|
}
|