-
Notifications
You must be signed in to change notification settings - Fork 39.3k
/
registry.go
178 lines (148 loc) · 4.68 KB
/
registry.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
/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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 executorinfo
import (
"fmt"
"strings"
"sync"
"github.com/gogo/protobuf/proto"
"github.com/mesos/mesos-go/mesosproto"
"k8s.io/kubernetes/contrib/mesos/pkg/node"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/meta"
)
// Registry is the interface that provides methods for interacting
// with a registry of ExecutorInfo objects
//
// Get looks up an ExecutorInfo object for the given hostname
//
// New returns an ExecutorInfo object based on a given hostname and resources
//
// Invalidate invalidates the given hostname from this registry.
// Note that a subsequent Get may recover the executor info.
type Registry interface {
New(hostname string, resources []*mesosproto.Resource) *mesosproto.ExecutorInfo
Get(hostname string) (*mesosproto.ExecutorInfo, error)
Invalidate(hostname string)
}
// registry implements a map-based in-memory ExecutorInfo registry
type registry struct {
cache *Cache
mu sync.RWMutex // protects fields above
lookupNode node.LookupFunc
prototype *mesosproto.ExecutorInfo
}
// NewRegistry returns a new executorinfo registry.
// The given prototype is being used for properties other than resources.
func NewRegistry(
lookupNode node.LookupFunc,
prototype *mesosproto.ExecutorInfo,
cache *Cache,
) (Registry, error) {
if prototype == nil {
return nil, fmt.Errorf("no prototype given")
}
if lookupNode == nil {
return nil, fmt.Errorf("no lookupNode given")
}
if cache == nil {
return nil, fmt.Errorf("no cache given")
}
return ®istry{
cache: cache,
lookupNode: lookupNode,
prototype: prototype,
}, nil
}
// New creates a customized ExecutorInfo for a host
//
// Note: New modifies Command.Arguments and Resources and intentionally
// does not update the executor id (although that originally depended on the
// command arguments and the resources). But as the hostname is constant for a
// given host, and the resources are compatible by the registry logic here this
// will not weaken our litmus test comparing the prototype ExecutorId with the
// id of running executors when an offer comes in.
func (r *registry) New(
hostname string,
resources []*mesosproto.Resource,
) *mesosproto.ExecutorInfo {
e := proto.Clone(r.prototype).(*mesosproto.ExecutorInfo)
e.Resources = resources
setCommandArgument(e, "--hostname-override", hostname)
r.mu.Lock()
defer r.mu.Unlock()
cached, ok := r.cache.Get(hostname)
if ok {
return cached
}
r.cache.Add(hostname, e)
return e
}
func (r *registry) Get(hostname string) (*mesosproto.ExecutorInfo, error) {
// first try to read from cached items
r.mu.RLock()
info, ok := r.cache.Get(hostname)
r.mu.RUnlock()
if ok {
return info, nil
}
result, err := r.resourcesFromNode(hostname)
if err != nil {
// master claims there is an executor with id, we cannot find any meta info
// => no way to recover this node
return nil, fmt.Errorf(
"failed to recover executor info for node %q, error: %v",
hostname, err,
)
}
return r.New(hostname, result), nil
}
func (r *registry) Invalidate(hostname string) {
r.mu.Lock()
defer r.mu.Unlock()
r.cache.Remove(hostname)
}
// resourcesFromNode looks up ExecutorInfo resources for the given hostname and executorinfo ID
// or returns an error in case of failure.
func (r *registry) resourcesFromNode(hostname string) ([]*mesosproto.Resource, error) {
n := r.lookupNode(hostname)
if n == nil {
return nil, fmt.Errorf("hostname %q not found", hostname)
}
encoded, ok := n.Annotations[meta.ExecutorResourcesKey]
if !ok {
return nil, fmt.Errorf(
"no %q annotation found in hostname %q",
meta.ExecutorResourcesKey, hostname,
)
}
return DecodeResources(strings.NewReader(encoded))
}
// setCommandArgument sets the given flag to the given value
// in the command arguments of the given executoringfo.
func setCommandArgument(ei *mesosproto.ExecutorInfo, flag, value string) {
if ei.Command == nil {
return
}
argv := ei.Command.Arguments
overwrite := false
for i, arg := range argv {
if strings.HasPrefix(arg, flag+"=") {
overwrite = true
argv[i] = flag + "=" + value
break
}
}
if !overwrite {
ei.Command.Arguments = append(argv, flag+"="+value)
}
}