blob: c5a865322646d7ca1a22284f14a89350816c28d8 (
plain)
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
|
/**
* Copyright (C) 2018 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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 "mongo/base/disallow_copying.h"
#include "mongo/util/periodic_runner.h"
namespace mongo {
class OperationContext;
class ServiceContext;
class PeriodicBalancerConfigRefresher final {
MONGO_DISALLOW_COPYING(PeriodicBalancerConfigRefresher);
public:
PeriodicBalancerConfigRefresher() = default;
~PeriodicBalancerConfigRefresher() = default;
PeriodicBalancerConfigRefresher(PeriodicBalancerConfigRefresher&& source) = delete;
PeriodicBalancerConfigRefresher& operator=(PeriodicBalancerConfigRefresher&& other) = delete;
/**
* Obtains the service-wide chunk PeriodicBalancerConfigRefresher instance.
*/
static PeriodicBalancerConfigRefresher& get(OperationContext* opCtx);
static PeriodicBalancerConfigRefresher& get(ServiceContext* serviceContext);
/**
* Sets the mode to either primary or secondary. If it is primary, starts a
* periodic task to refresh the balancer configuration. The
* PeriodicBalancerConfigRefresher is only active when primary.
*/
void onShardingInitialization(ServiceContext* serviceContext, bool isPrimary);
/**
* Invoked when the shard server primary enters the 'PRIMARY' state to
* trigger the start of the periodic refresh task.
*/
void onStepUp(ServiceContext* serviceContext);
/**
* Invoked when this node which is currently serving as a 'PRIMARY' steps down.
*
* Pauses the periodic refresh until subsequent step up. This method might
* be called multiple times in succession, which is what happens as a
* result of incomplete transition to primary so it is resilient to that.
*/
void onStepDown();
private:
bool _isPrimary{false};
// Periodic job for refreshing the balancer configuration
std::unique_ptr<PeriodicRunner::PeriodicJobHandle> _balancerConfigRefresher;
};
} // namespace mongo
|