This repository has been archived by the owner on Feb 11, 2022. It is now read-only.
forked from aerospike/aerospike-client-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
partition.go
277 lines (230 loc) · 7.17 KB
/
partition.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
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
// Copyright 2013-2020 Aerospike, Inc.
//
// 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 aerospike
import (
"fmt"
"sync/atomic"
. "github.com/aerospike/aerospike-client-go/types"
Buffer "github.com/aerospike/aerospike-client-go/utils/buffer"
)
// Partition encapsulates partition information.
type Partition struct {
Namespace string
PartitionId int
partitions *Partitions
replica ReplicaPolicy
sequence int
linearize bool
}
// NewPartition returns a partition representation
func NewPartition(partitions *Partitions, key *Key, replica ReplicaPolicy, linearize bool) *Partition {
return &Partition{
partitions: partitions,
Namespace: key.Namespace(),
replica: replica,
linearize: linearize,
// CAN'T USE MOD directly - mod will give negative numbers.
// First AND makes positive and negative correctly, then mod.
PartitionId: int(Buffer.LittleBytesToInt32(key.digest[:], 0)&0xFFFF) & (_PARTITIONS - 1),
}
}
// PartitionForWrite returns a partition for write purposes
func PartitionForWrite(cluster *Cluster, policy *BasePolicy, key *Key) (*Partition, error) {
// Must copy hashmap reference for copy on write semantics to work.
pmap := cluster.getPartitions()
partitions := pmap[key.namespace]
if partitions == nil {
return nil, newInvalidNamespaceError(key.namespace, len(pmap))
}
return NewPartition(partitions, key, policy.ReplicaPolicy, false), nil
}
// PartitionForRead returns a partition for read purposes
func PartitionForRead(cluster *Cluster, policy *BasePolicy, key *Key) (*Partition, error) {
// Must copy hashmap reference for copy on write semantics to work.
pmap := cluster.getPartitions()
partitions := pmap[key.namespace]
if partitions == nil {
return nil, newInvalidNamespaceError(key.namespace, len(pmap))
}
var replica ReplicaPolicy
var linearize bool
if partitions.SCMode {
switch policy.ReadModeSC {
case ReadModeSCSession:
replica = MASTER
linearize = false
case ReadModeSCLinearize:
replica = policy.ReplicaPolicy
if policy.ReplicaPolicy == PREFER_RACK {
replica = SEQUENCE
}
linearize = true
default:
replica = policy.ReplicaPolicy
linearize = false
}
} else {
replica = policy.ReplicaPolicy
linearize = false
}
return NewPartition(partitions, key, replica, linearize), nil
}
// GetReplicaPolicySC returns a ReplicaPolicy based on different variables in SC mode
func GetReplicaPolicySC(policy *BasePolicy) ReplicaPolicy {
switch policy.ReadModeSC {
case ReadModeSCSession:
return MASTER
case ReadModeSCLinearize:
if policy.ReplicaPolicy == PREFER_RACK {
return SEQUENCE
}
return policy.ReplicaPolicy
default:
return policy.ReplicaPolicy
}
}
// GetNodeBatchRead returns a node for batch reads
func GetNodeBatchRead(cluster *Cluster, key *Key, replica ReplicaPolicy, replicaSC ReplicaPolicy, sequence int, sequenceSC int) (*Node, error) {
// Must copy hashmap reference for copy on write semantics to work.
pmap := cluster.getPartitions()
partitions := pmap[key.namespace]
if partitions == nil {
return nil, newInvalidNamespaceError(key.namespace, len(pmap))
}
if partitions.SCMode {
replica = replicaSC
sequence = sequenceSC
}
p := NewPartition(partitions, key, replica, false)
p.sequence = sequence
return p.GetNodeRead(cluster)
}
// GetNodeRead returns a node for read operations
func (ptn *Partition) GetNodeRead(cluster *Cluster) (*Node, error) {
switch ptn.replica {
default:
fallthrough
case SEQUENCE:
return ptn.getSequenceNode(cluster)
case PREFER_RACK:
return ptn.getRackNode(cluster)
case MASTER:
return ptn.getMasterNode(cluster)
case MASTER_PROLES:
return ptn.getMasterProlesNode(cluster)
case RANDOM:
return cluster.GetRandomNode()
}
}
// GetNodeWrite returns a node for write operations
func (ptn *Partition) GetNodeWrite(cluster *Cluster) (*Node, error) {
switch ptn.replica {
default:
fallthrough
case SEQUENCE:
fallthrough
case PREFER_RACK:
return ptn.getSequenceNode(cluster)
case MASTER:
fallthrough
case MASTER_PROLES:
fallthrough
case RANDOM:
return ptn.getMasterNode(cluster)
}
}
// PrepareRetryRead increases sequence number before read retries
func (ptn *Partition) PrepareRetryRead(isClientTimeout bool) {
if !isClientTimeout || !ptn.linearize {
ptn.sequence++
}
}
// PrepareRetryRead increases sequence number before write retries
func (ptn *Partition) PrepareRetryWrite(isClientTimeout bool) {
if !isClientTimeout {
ptn.sequence++
}
}
func (ptn *Partition) getSequenceNode(cluster *Cluster) (*Node, error) {
replicas := ptn.partitions.Replicas
for range replicas {
index := ptn.sequence % len(replicas)
node := replicas[index][ptn.PartitionId]
if node != nil && node.IsActive() {
return node, nil
}
ptn.sequence++
}
nodeArray := cluster.GetNodes()
return nil, newInvalidNodeError(len(nodeArray), ptn)
}
func (ptn *Partition) getRackNode(cluster *Cluster) (*Node, error) {
replicas := ptn.partitions.Replicas
var fallback *Node
for range replicas {
index := ptn.sequence % len(replicas)
node := replicas[index][ptn.PartitionId]
if node != nil && node.IsActive() {
if node.hasRack(ptn.Namespace, cluster.clientPolicy.RackId) {
return node, nil
}
if fallback == nil {
fallback = node
}
}
ptn.sequence++
}
if fallback != nil {
return fallback, nil
}
nodeArray := cluster.GetNodes()
return nil, newInvalidNodeError(len(nodeArray), ptn)
}
func (ptn *Partition) getMasterNode(cluster *Cluster) (*Node, error) {
node := ptn.partitions.Replicas[0][ptn.PartitionId]
if node != nil && node.IsActive() {
return node, nil
}
nodeArray := cluster.GetNodes()
return nil, newInvalidNodeError(len(nodeArray), ptn)
}
func (ptn *Partition) getMasterProlesNode(cluster *Cluster) (*Node, error) {
replicas := ptn.partitions.Replicas
for range replicas {
index := int(atomic.AddUint64(&cluster.replicaIndex, 1) % uint64(len(replicas)))
node := replicas[index][ptn.PartitionId]
if node != nil && node.IsActive() {
return node, nil
}
}
nodeArray := cluster.GetNodes()
return nil, newInvalidNodeError(len(nodeArray), ptn)
}
// String implements the Stringer interface.
func (ptn *Partition) String() string {
return fmt.Sprintf("%s:%d", ptn.Namespace, ptn.PartitionId)
}
// Equals checks equality of two partitions.
func (ptn *Partition) Equals(other *Partition) bool {
return ptn.PartitionId == other.PartitionId && ptn.Namespace == other.Namespace
}
// newnewInvalidNamespaceError creates an AerospikeError with Resultcode INVALID_NAMESPACE
// and a corresponding message.
func newInvalidNamespaceError(ns string, mapSize int) error {
s := "Partition map empty"
if mapSize != 0 {
s = "Namespace not found in partition map: " + ns
}
return NewAerospikeError(INVALID_NAMESPACE, s)
}