This repository has been archived by the owner on Jul 1, 2023. It is now read-only.
forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 1
/
state_file.go
211 lines (169 loc) · 5.64 KB
/
state_file.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
201
202
203
204
205
206
207
208
209
210
211
/*
Copyright 2017 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 state
import (
"encoding/json"
"fmt"
"github.com/golang/glog"
"io/ioutil"
"k8s.io/kubernetes/pkg/kubelet/cm/cpuset"
"os"
"sync"
)
type stateFileData struct {
PolicyName string `json:"policyName"`
DefaultCPUSet string `json:"defaultCpuSet"`
Entries map[string]string `json:"entries,omitempty"`
}
var _ State = &stateFile{}
type stateFile struct {
sync.RWMutex
stateFilePath string
policyName string
cache State
}
// NewFileState creates new State for keeping track of cpu/pod assignment with file backend
func NewFileState(filePath string, policyName string) State {
stateFile := &stateFile{
stateFilePath: filePath,
cache: NewMemoryState(),
policyName: policyName,
}
if err := stateFile.tryRestoreState(); err != nil {
// could not restore state, init new state file
msg := fmt.Sprintf("[cpumanager] state file: unable to restore state from disk (%s)\n", err.Error()) +
"Panicking because we cannot guarantee sane CPU affinity for existing containers.\n" +
fmt.Sprintf("Please drain this node and delete the CPU manager state file \"%s\" before restarting Kubelet.", stateFile.stateFilePath)
panic(msg)
}
return stateFile
}
// tryRestoreState tries to read state file, upon any error,
// err message is logged and state is left clean. un-initialized
func (sf *stateFile) tryRestoreState() error {
sf.Lock()
defer sf.Unlock()
var err error
// used when all parsing is ok
tmpAssignments := make(ContainerCPUAssignments)
tmpDefaultCPUSet := cpuset.NewCPUSet()
tmpContainerCPUSet := cpuset.NewCPUSet()
var content []byte
content, err = ioutil.ReadFile(sf.stateFilePath)
// If the state file does not exist or has zero length, write a new file.
if os.IsNotExist(err) || len(content) == 0 {
sf.storeState()
glog.Infof("[cpumanager] state file: created new state file \"%s\"", sf.stateFilePath)
return nil
}
// Fail on any other file read error.
if err != nil {
return err
}
// File exists; try to read it.
var readState stateFileData
if err = json.Unmarshal(content, &readState); err != nil {
glog.Errorf("[cpumanager] state file: could not unmarshal, corrupted state file - \"%s\"", sf.stateFilePath)
return err
}
if sf.policyName != readState.PolicyName {
return fmt.Errorf("policy configured \"%s\" != policy from state file \"%s\"", sf.policyName, readState.PolicyName)
}
if tmpDefaultCPUSet, err = cpuset.Parse(readState.DefaultCPUSet); err != nil {
glog.Errorf("[cpumanager] state file: could not parse state file - [defaultCpuSet:\"%s\"]", readState.DefaultCPUSet)
return err
}
for containerID, cpuString := range readState.Entries {
if tmpContainerCPUSet, err = cpuset.Parse(cpuString); err != nil {
glog.Errorf("[cpumanager] state file: could not parse state file - container id: %s, cpuset: \"%s\"", containerID, cpuString)
return err
}
tmpAssignments[containerID] = tmpContainerCPUSet
}
sf.cache.SetDefaultCPUSet(tmpDefaultCPUSet)
sf.cache.SetCPUAssignments(tmpAssignments)
glog.V(2).Infof("[cpumanager] state file: restored state from state file \"%s\"", sf.stateFilePath)
glog.V(2).Infof("[cpumanager] state file: defaultCPUSet: %s", tmpDefaultCPUSet.String())
return nil
}
// saves state to a file, caller is responsible for locking
func (sf *stateFile) storeState() {
var content []byte
var err error
data := stateFileData{
PolicyName: sf.policyName,
DefaultCPUSet: sf.cache.GetDefaultCPUSet().String(),
Entries: map[string]string{},
}
for containerID, cset := range sf.cache.GetCPUAssignments() {
data.Entries[containerID] = cset.String()
}
if content, err = json.Marshal(data); err != nil {
panic("[cpumanager] state file: could not serialize state to json")
}
if err = ioutil.WriteFile(sf.stateFilePath, content, 0644); err != nil {
panic("[cpumanager] state file not written")
}
return
}
func (sf *stateFile) GetCPUSet(containerID string) (cpuset.CPUSet, bool) {
sf.RLock()
defer sf.RUnlock()
res, ok := sf.cache.GetCPUSet(containerID)
return res, ok
}
func (sf *stateFile) GetDefaultCPUSet() cpuset.CPUSet {
sf.RLock()
defer sf.RUnlock()
return sf.cache.GetDefaultCPUSet()
}
func (sf *stateFile) GetCPUSetOrDefault(containerID string) cpuset.CPUSet {
sf.RLock()
defer sf.RUnlock()
return sf.cache.GetCPUSetOrDefault(containerID)
}
func (sf *stateFile) GetCPUAssignments() ContainerCPUAssignments {
sf.RLock()
defer sf.RUnlock()
return sf.cache.GetCPUAssignments()
}
func (sf *stateFile) SetCPUSet(containerID string, cset cpuset.CPUSet) {
sf.Lock()
defer sf.Unlock()
sf.cache.SetCPUSet(containerID, cset)
sf.storeState()
}
func (sf *stateFile) SetDefaultCPUSet(cset cpuset.CPUSet) {
sf.Lock()
defer sf.Unlock()
sf.cache.SetDefaultCPUSet(cset)
sf.storeState()
}
func (sf *stateFile) SetCPUAssignments(a ContainerCPUAssignments) {
sf.Lock()
defer sf.Unlock()
sf.cache.SetCPUAssignments(a)
sf.storeState()
}
func (sf *stateFile) Delete(containerID string) {
sf.Lock()
defer sf.Unlock()
sf.cache.Delete(containerID)
sf.storeState()
}
func (sf *stateFile) ClearState() {
sf.Lock()
defer sf.Unlock()
sf.cache.ClearState()
sf.storeState()
}