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
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <functional>
#include "mongo/base/string_data.h"
#include "mongo/client/replica_set_change_notifier.h"
#include "mongo/db/repl/replica_set_aware_service.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/s/type_shard_identity.h"
#include "mongo/s/sharding_initialization.h"
namespace mongo {
/**
* This class serves as a bootstrap and shutdown for the sharding subsystem and also controls the
* persisted cluster identity. The default ShardingEnvironmentInitFunc instantiates all the sharding
* services, attaches them to the same service context to which it itself is attached and puts the
* ShardingState in the initialized state.
*/
class ShardingInitializationMongoD : public ReplicaSetAwareService<ShardingInitializationMongoD> {
ShardingInitializationMongoD(const ShardingInitializationMongoD&) = delete;
ShardingInitializationMongoD& operator=(const ShardingInitializationMongoD&) = delete;
public:
using ShardingEnvironmentInitFunc =
std::function<void(OperationContext* opCtx, const ShardIdentity& shardIdentity)>;
ShardingInitializationMongoD();
~ShardingInitializationMongoD();
static ShardingInitializationMongoD* get(OperationContext* opCtx);
static ShardingInitializationMongoD* get(ServiceContext* service);
/**
* If started with --shardsvr, initializes sharding awareness from the shardIdentity document on
* disk, if there is one.
*
* If started with --shardsvr in queryableBackupMode, initializes sharding awareness from the
* shardIdentity document passed through the --overrideShardIdentity startup parameter.
*
* If it returns true, the '_initFunc' was called, meaning all the core classes for sharding
* were initialized, but no networking calls were made yet (with the exception of the duplicate
* ShardRegistry reload in ShardRegistry::startup() (see SERVER-26123). Outgoing networking
* calls to cluster members can now be made.
*
* If it returns false, this means the node is not yet sharding aware.
*
* NOTE: this function might be called more than once.
* NOTE: this function briefly takes the global lock to determine primary/secondary state.
*/
bool initializeShardingAwarenessIfNeeded(OperationContext* opCtx);
/**
* Initializes the sharding state of this server from the shard identity document argument and
* sets secondary or primary state information on the catalog cache loader.
*
* NOTE: This must be called under at least Global IX lock in order for the replica set member
* state to be stable (primary/secondary).
*/
void initializeFromShardIdentity(OperationContext* opCtx,
const ShardIdentityType& shardIdentity);
void shutDown(OperationContext* service);
/**
* Updates the config server field of the shardIdentity document with the given connection
* string.
*/
static void updateShardIdentityConfigString(OperationContext* opCtx,
const ConnectionString& newConnectionString);
/**
* For testing only. Mock the initialization method used by initializeFromConfigConnString and
* initializeFromShardIdentity after all checks are performed.
*/
void setGlobalInitMethodForTest(ShardingEnvironmentInitFunc func) {
_initFunc = std::move(func);
}
private:
void _initializeShardingEnvironmentOnShardServer(OperationContext* opCtx,
const ShardIdentity& shardIdentity);
// Virtual methods coming from the ReplicaSetAwareService
void onStartup(OperationContext* opCtx) override final {}
void onSetCurrentConfig(OperationContext* opCtx) override final;
void onInitialDataAvailable(OperationContext* opCtx,
bool isMajorityDataAvailable) override final;
void onShutdown() override final {}
void onStepUpBegin(OperationContext* opCtx, long long term) override final {}
void onStepUpComplete(OperationContext* opCtx, long long term) override final {}
void onStepDown() override final {}
void onBecomeArbiter() override final {}
// This mutex ensures that only one thread at a time executes the sharding
// initialization/teardown sequence
Mutex _initSynchronizationMutex =
MONGO_MAKE_LATCH("ShardingInitializationMongod::_initSynchronizationMutex");
// Function for initializing the sharding environment components (i.e. everything on the Grid)
ShardingEnvironmentInitFunc _initFunc;
std::shared_ptr<ReplicaSetChangeNotifier::Listener> _replicaSetChangeListener;
};
/**
* Initialize the sharding components of this server. This can be used on both shard and config
* servers.
*
* NOTE: This does not initialize ShardingState, which should only be done for shard servers.
*/
void initializeGlobalShardingStateForMongoD(OperationContext* opCtx,
const ShardId& shardId,
const ConnectionString& configCS);
} // namespace mongo
|
