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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
|
package cluster
import (
"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
"math"
"sync"
"time"
)
const (
MasterType = "master"
VolumeServerType = "volumeServer"
FilerType = "filer"
BrokerType = "broker"
)
type FilerGroup string
type Filers struct {
filers map[pb.ServerAddress]*ClusterNode
leaders *Leaders
}
type Leaders struct {
leaders [3]pb.ServerAddress
}
type ClusterNode struct {
Address pb.ServerAddress
Version string
counter int
CreatedTs time.Time
}
type Cluster struct {
filerGroup2filers map[FilerGroup]*Filers
filersLock sync.RWMutex
brokers map[pb.ServerAddress]*ClusterNode
brokersLock sync.RWMutex
}
func NewCluster() *Cluster {
return &Cluster{
filerGroup2filers: make(map[FilerGroup]*Filers),
brokers: make(map[pb.ServerAddress]*ClusterNode),
}
}
func (cluster *Cluster) getFilers(filerGroup FilerGroup, createIfNotFound bool) *Filers {
filers, found := cluster.filerGroup2filers[filerGroup]
if !found && createIfNotFound {
filers = &Filers{
filers: make(map[pb.ServerAddress]*ClusterNode),
leaders: &Leaders{},
}
cluster.filerGroup2filers[filerGroup] = filers
}
return filers
}
func (cluster *Cluster) AddClusterNode(ns, nodeType string, address pb.ServerAddress, version string) []*master_pb.KeepConnectedResponse {
filerGroup := FilerGroup(ns)
switch nodeType {
case FilerType:
cluster.filersLock.Lock()
defer cluster.filersLock.Unlock()
filers := cluster.getFilers(filerGroup, true)
if existingNode, found := filers.filers[address]; found {
existingNode.counter++
return nil
}
filers.filers[address] = &ClusterNode{
Address: address,
Version: version,
counter: 1,
CreatedTs: time.Now(),
}
return cluster.ensureFilerLeaders(filers, true, filerGroup, nodeType, address)
case BrokerType:
cluster.brokersLock.Lock()
defer cluster.brokersLock.Unlock()
if existingNode, found := cluster.brokers[address]; found {
existingNode.counter++
return nil
}
cluster.brokers[address] = &ClusterNode{
Address: address,
Version: version,
counter: 1,
CreatedTs: time.Now(),
}
return []*master_pb.KeepConnectedResponse{
{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
NodeType: nodeType,
Address: string(address),
IsAdd: true,
},
},
}
case MasterType:
return []*master_pb.KeepConnectedResponse{
{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
NodeType: nodeType,
Address: string(address),
IsAdd: true,
},
},
}
}
return nil
}
func (cluster *Cluster) RemoveClusterNode(ns string, nodeType string, address pb.ServerAddress) []*master_pb.KeepConnectedResponse {
filerGroup := FilerGroup(ns)
switch nodeType {
case FilerType:
cluster.filersLock.Lock()
defer cluster.filersLock.Unlock()
filers := cluster.getFilers(filerGroup, false)
if filers == nil {
return nil
}
if existingNode, found := filers.filers[address]; !found {
return nil
} else {
existingNode.counter--
if existingNode.counter <= 0 {
delete(filers.filers, address)
return cluster.ensureFilerLeaders(filers, false, filerGroup, nodeType, address)
}
}
case BrokerType:
cluster.brokersLock.Lock()
defer cluster.brokersLock.Unlock()
if existingNode, found := cluster.brokers[address]; !found {
return nil
} else {
existingNode.counter--
if existingNode.counter <= 0 {
delete(cluster.brokers, address)
return []*master_pb.KeepConnectedResponse{
{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
NodeType: nodeType,
Address: string(address),
IsAdd: false,
},
},
}
}
}
case MasterType:
return []*master_pb.KeepConnectedResponse{
{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
NodeType: nodeType,
Address: string(address),
IsAdd: false,
},
},
}
}
return nil
}
func (cluster *Cluster) ListClusterNode(filerGroup FilerGroup, nodeType string) (nodes []*ClusterNode) {
switch nodeType {
case FilerType:
cluster.filersLock.RLock()
defer cluster.filersLock.RUnlock()
filers := cluster.getFilers(filerGroup, false)
if filers == nil {
return
}
for _, node := range filers.filers {
nodes = append(nodes, node)
}
case BrokerType:
cluster.brokersLock.RLock()
defer cluster.brokersLock.RUnlock()
for _, node := range cluster.brokers {
nodes = append(nodes, node)
}
case MasterType:
}
return
}
func (cluster *Cluster) IsOneLeader(filerGroup FilerGroup, address pb.ServerAddress) bool {
filers := cluster.getFilers(filerGroup, false)
if filers == nil {
return false
}
return filers.leaders.isOneLeader(address)
}
func (cluster *Cluster) ensureFilerLeaders(filers *Filers, isAdd bool, filerGroup FilerGroup, nodeType string, address pb.ServerAddress) (result []*master_pb.KeepConnectedResponse) {
if isAdd {
if filers.leaders.addLeaderIfVacant(address) {
// has added the address as one leader
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
FilerGroup: string(filerGroup),
NodeType: nodeType,
Address: string(address),
IsLeader: true,
IsAdd: true,
},
})
} else {
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
FilerGroup: string(filerGroup),
NodeType: nodeType,
Address: string(address),
IsLeader: false,
IsAdd: true,
},
})
}
} else {
if filers.leaders.removeLeaderIfExists(address) {
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
FilerGroup: string(filerGroup),
NodeType: nodeType,
Address: string(address),
IsLeader: true,
IsAdd: false,
},
})
// pick the freshest one, since it is less likely to go away
var shortestDuration int64 = math.MaxInt64
now := time.Now()
var candidateAddress pb.ServerAddress
for _, node := range filers.filers {
if filers.leaders.isOneLeader(node.Address) {
continue
}
duration := now.Sub(node.CreatedTs).Nanoseconds()
if duration < shortestDuration {
shortestDuration = duration
candidateAddress = node.Address
}
}
if candidateAddress != "" {
filers.leaders.addLeaderIfVacant(candidateAddress)
// added a new leader
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
NodeType: nodeType,
Address: string(candidateAddress),
IsLeader: true,
IsAdd: true,
},
})
}
} else {
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
FilerGroup: string(filerGroup),
NodeType: nodeType,
Address: string(address),
IsLeader: false,
IsAdd: false,
},
})
}
}
return
}
func (leaders *Leaders) addLeaderIfVacant(address pb.ServerAddress) (hasChanged bool) {
if leaders.isOneLeader(address) {
return
}
for i := 0; i < len(leaders.leaders); i++ {
if leaders.leaders[i] == "" {
leaders.leaders[i] = address
hasChanged = true
return
}
}
return
}
func (leaders *Leaders) removeLeaderIfExists(address pb.ServerAddress) (hasChanged bool) {
if !leaders.isOneLeader(address) {
return
}
for i := 0; i < len(leaders.leaders); i++ {
if leaders.leaders[i] == address {
leaders.leaders[i] = ""
hasChanged = true
return
}
}
return
}
func (leaders *Leaders) isOneLeader(address pb.ServerAddress) bool {
for i := 0; i < len(leaders.leaders); i++ {
if leaders.leaders[i] == address {
return true
}
}
return false
}
func (leaders *Leaders) GetLeaders() (addresses []pb.ServerAddress) {
for i := 0; i < len(leaders.leaders); i++ {
if leaders.leaders[i] != "" {
addresses = append(addresses, leaders.leaders[i])
}
}
return
}
|
