forked from tikv/client-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
store_vars.go
72 lines (61 loc) · 2.48 KB
/
store_vars.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
// Copyright 2021 TiKV 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.
// NOTE: The code in this file is based on code from the
// TiDB project, licensed under the Apache License v 2.0
//
// https://github.com/pingcap/tidb/tree/cc5e161ac06827589c4966674597c137cc9e809c/store/tikv/kv/store_vars.go
//
// Copyright 2019 PingCAP, 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 kv
import (
"go.uber.org/atomic"
)
// StoreLimit will update from config reload and global variable set.
var StoreLimit atomic.Int64
// DefTxnCommitBatchSize is the default value of TxnCommitBatchSize.
const DefTxnCommitBatchSize uint64 = 16 * 1024
// TxnCommitBatchSize controls the batch size of transaction commit related requests sent by client to TiKV,
// TiKV recommends each RPC packet should be less than ~1MB.
var TxnCommitBatchSize atomic.Uint64
func init() {
TxnCommitBatchSize.Store(DefTxnCommitBatchSize)
}
// ReplicaReadType is the type of replica to read data from
type ReplicaReadType byte
const (
// ReplicaReadLeader stands for 'read from leader'.
ReplicaReadLeader ReplicaReadType = iota
// ReplicaReadFollower stands for 'read from follower'.
ReplicaReadFollower
// ReplicaReadMixed stands for 'read from leader and follower and learner'.
ReplicaReadMixed
// ReplicaReadLearner stands for 'read from learner'.
ReplicaReadLearner
)
// IsFollowerRead checks if follower is going to be used to read data.
func (r ReplicaReadType) IsFollowerRead() bool {
return r != ReplicaReadLeader
}