-
Notifications
You must be signed in to change notification settings - Fork 400
/
apf_filter.go
200 lines (172 loc) · 7.82 KB
/
apf_filter.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/*
Copyright 2019 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 flowcontrol
import (
"context"
"strconv"
"time"
"k8s.io/apiserver/pkg/server/httplog"
"k8s.io/apiserver/pkg/server/mux"
fq "k8s.io/apiserver/pkg/util/flowcontrol/fairqueuing"
"k8s.io/apiserver/pkg/util/flowcontrol/fairqueuing/eventclock"
fqs "k8s.io/apiserver/pkg/util/flowcontrol/fairqueuing/queueset"
"k8s.io/apiserver/pkg/util/flowcontrol/metrics"
fcrequest "k8s.io/apiserver/pkg/util/flowcontrol/request"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/klog/v2"
"k8s.io/utils/clock"
flowcontrol "k8s.io/api/flowcontrol/v1beta2"
flowcontrolclient "k8s.io/client-go/kubernetes/typed/flowcontrol/v1beta2"
)
// ConfigConsumerAsFieldManager is how the config consuminng
// controller appears in an ObjectMeta ManagedFieldsEntry.Manager
const ConfigConsumerAsFieldManager = "api-priority-and-fairness-config-consumer-v1"
// Interface defines how the API Priority and Fairness filter interacts with the underlying system.
type Interface interface {
// Handle takes care of queuing and dispatching a request
// characterized by the given digest. The given `noteFn` will be
// invoked with the results of request classification.
// The given `workEstimator` is called, if at all, after noteFn.
// `workEstimator` will be invoked only when the request
// is classified as non 'exempt'.
// 'workEstimator', when invoked, must return the
// work parameters for the request.
// If the request is queued then `queueNoteFn` will be called twice,
// first with `true` and then with `false`; otherwise
// `queueNoteFn` will not be called at all. If Handle decides
// that the request should be executed then `execute()` will be
// invoked once to execute the request; otherwise `execute()` will
// not be invoked.
// Handle() should never return while execute() is running, even if
// ctx is cancelled or times out.
Handle(ctx context.Context,
requestDigest RequestDigest,
noteFn func(fs *flowcontrol.FlowSchema, pl *flowcontrol.PriorityLevelConfiguration, flowDistinguisher string),
workEstimator func() fcrequest.WorkEstimate,
queueNoteFn fq.QueueNoteFn,
execFn func(),
)
// MaintainObservations is a helper for maintaining statistics.
MaintainObservations(stopCh <-chan struct{})
// Run monitors config objects from the main apiservers and causes
// any needed changes to local behavior. This method ceases
// activity and returns after the given channel is closed.
Run(stopCh <-chan struct{}) error
// Install installs debugging endpoints to the web-server.
Install(c *mux.PathRecorderMux)
// WatchTracker provides the WatchTracker interface.
WatchTracker
}
// This request filter implements https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/1040-priority-and-fairness/README.md
// New creates a new instance to implement API priority and fairness
func New(
informerFactory kubeinformers.SharedInformerFactory,
flowcontrolClient flowcontrolclient.FlowcontrolV1beta2Interface,
serverConcurrencyLimit int,
requestWaitLimit time.Duration,
) Interface {
clk := eventclock.Real{}
return NewTestable(TestableConfig{
Name: "Controller",
Clock: clk,
AsFieldManager: ConfigConsumerAsFieldManager,
FoundToDangling: func(found bool) bool { return !found },
InformerFactory: informerFactory,
FlowcontrolClient: flowcontrolClient,
ServerConcurrencyLimit: serverConcurrencyLimit,
RequestWaitLimit: requestWaitLimit,
ReqsObsPairGenerator: metrics.PriorityLevelConcurrencyObserverPairGenerator,
ExecSeatsObsGenerator: metrics.PriorityLevelExecutionSeatsObserverGenerator,
QueueSetFactory: fqs.NewQueueSetFactory(clk),
})
}
// TestableConfig carries the parameters to an implementation that is testable
type TestableConfig struct {
// Name of the controller
Name string
// Clock to use in timing deliberate delays
Clock clock.PassiveClock
// AsFieldManager is the string to use in the metadata for
// server-side apply. Normally this is
// `ConfigConsumerAsFieldManager`. This is exposed as a parameter
// so that a test of competing controllers can supply different
// values.
AsFieldManager string
// FoundToDangling maps the boolean indicating whether a
// FlowSchema's referenced PLC exists to the boolean indicating
// that FlowSchema's status should indicate a dangling reference.
// This is a parameter so that we can write tests of what happens
// when servers disagree on that bit of Status.
FoundToDangling func(bool) bool
// InformerFactory to use in building the controller
InformerFactory kubeinformers.SharedInformerFactory
// FlowcontrolClient to use for manipulating config objects
FlowcontrolClient flowcontrolclient.FlowcontrolV1beta2Interface
// ServerConcurrencyLimit for the controller to enforce
ServerConcurrencyLimit int
// RequestWaitLimit configured on the server
RequestWaitLimit time.Duration
// ObsPairGenerator for metrics about requests
ReqsObsPairGenerator metrics.RatioedChangeObserverPairGenerator
// RatioedChangeObserverPairGenerator for metrics about seats occupied by all phases of execution
ExecSeatsObsGenerator metrics.RatioedChangeObserverGenerator
// QueueSetFactory for the queuing implementation
QueueSetFactory fq.QueueSetFactory
}
// NewTestable is extra flexible to facilitate testing
func NewTestable(config TestableConfig) Interface {
return newTestableController(config)
}
func (cfgCtlr *configController) Handle(ctx context.Context, requestDigest RequestDigest,
noteFn func(fs *flowcontrol.FlowSchema, pl *flowcontrol.PriorityLevelConfiguration, flowDistinguisher string),
workEstimator func() fcrequest.WorkEstimate,
queueNoteFn fq.QueueNoteFn,
execFn func()) {
fs, pl, isExempt, req, startWaitingTime := cfgCtlr.startRequest(ctx, requestDigest, noteFn, workEstimator, queueNoteFn)
queued := startWaitingTime != time.Time{}
if req == nil {
if queued {
metrics.ObserveWaitingDuration(ctx, pl.Name, fs.Name, strconv.FormatBool(req != nil), time.Since(startWaitingTime))
}
klog.V(7).Infof("Handle(%#+v) => fsName=%q, distMethod=%#+v, plName=%q, isExempt=%v, reject", requestDigest, fs.Name, fs.Spec.DistinguisherMethod, pl.Name, isExempt)
return
}
klog.V(7).Infof("Handle(%#+v) => fsName=%q, distMethod=%#+v, plName=%q, isExempt=%v, queued=%v", requestDigest, fs.Name, fs.Spec.DistinguisherMethod, pl.Name, isExempt, queued)
var executed bool
idle, panicking := true, true
defer func() {
klog.V(7).Infof("Handle(%#+v) => fsName=%q, distMethod=%#+v, plName=%q, isExempt=%v, queued=%v, Finish() => panicking=%v idle=%v",
requestDigest, fs.Name, fs.Spec.DistinguisherMethod, pl.Name, isExempt, queued, panicking, idle)
if idle {
cfgCtlr.maybeReap(pl.Name)
}
}()
idle = req.Finish(func() {
if queued {
metrics.ObserveWaitingDuration(ctx, pl.Name, fs.Name, strconv.FormatBool(req != nil), time.Since(startWaitingTime))
}
metrics.AddDispatch(ctx, pl.Name, fs.Name)
executed = true
startExecutionTime := time.Now()
defer func() {
executionTime := time.Since(startExecutionTime)
httplog.AddKeyValue(ctx, "apf_execution_time", executionTime)
metrics.ObserveExecutionDuration(ctx, pl.Name, fs.Name, executionTime)
}()
execFn()
})
if queued && !executed {
metrics.ObserveWaitingDuration(ctx, pl.Name, fs.Name, strconv.FormatBool(req != nil), time.Since(startWaitingTime))
}
panicking = false
}