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
|
/**
* Copyright (C) 2020-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 <string>
#include <vector>
#include "mongo/db/repl/abstract_async_component.h"
#include "mongo/db/repl/oplog_buffer.h"
#include "mongo/db/repl/oplog_entry.h"
#include "mongo/util/future.h"
namespace mongo {
namespace repl {
struct TenantOplogEntry {
TenantOplogEntry() = default;
explicit TenantOplogEntry(OplogEntry&& in_entry) : entry(in_entry) {}
TenantOplogEntry(OplogEntry&& in_entry, int in_expansionsEntry)
: entry(in_entry), expansionsEntry(in_expansionsEntry) {}
OplogEntry entry;
// If this entry is a transaction commit or applyOps, the index within the
// TenantOplogBatch::expansions array containing the oplog entries it expands to.
int expansionsEntry = -1;
// When the fetched donor oplog entry represents modifications to internal collections
// (i.e, collections in admin/config DBs), shard merge protocol skips applying those oplog
// entries. In those cases, we set this field to 'true' to indicate that the tenant oplog
// applier can skip writing no-op entries for this oplog entry.
bool ignore = false;
};
struct TenantOplogBatch {
std::vector<TenantOplogEntry> ops;
std::vector<std::vector<OplogEntry>> expansions;
};
/**
* This class consumes batches of oplog entries from the RandomAccessOplogBuffer to give to the
* tenant oplog applier. It expands transactions into their individual ops and keeps them together
* in a single batch. The original transaction information is included in the batch.
*/
class TenantOplogBatcher : public AbstractAsyncComponent,
public std::enable_shared_from_this<TenantOplogBatcher> {
public:
class BatchLimits {
public:
BatchLimits() = default;
BatchLimits(size_t in_bytes, size_t in_ops) : bytes(in_bytes), ops(in_ops) {}
size_t bytes = 0;
size_t ops = 0;
};
TenantOplogBatcher(const UUID& migrationUuid,
RandomAccessOplogBuffer* oplogBuffer,
std::shared_ptr<executor::TaskExecutor> executor,
Timestamp resumeBatchingTs,
OpTime beginApplyingAfterOpTime);
virtual ~TenantOplogBatcher();
/**
* Returns a future for the next oplog batch. Client must not ask for another batch until
* the Future is ready.
*/
SemiFuture<TenantOplogBatch> getNextBatch(BatchLimits limits);
private:
SemiFuture<TenantOplogBatch> _scheduleNextBatch(WithLock, BatchLimits limits);
StatusWith<TenantOplogBatch> _readNextBatch(BatchLimits limits);
bool _mustProcessIndividually(const OplogEntry& entry);
void _consume(OperationContext* opCtx);
void _pushEntry(OperationContext* opCtx, TenantOplogBatch* batch, OplogEntry&& op);
void _doStartup_inlock() final;
void _doShutdown_inlock() noexcept final;
void _preJoin() noexcept final {}
Mutex* _getMutex() noexcept final {
return &_mutex;
}
Mutex _mutex = MONGO_MAKE_LATCH("TenantOplogBatcher::_mutex");
// All member variables are labeled with one of the following codes indicating the
// synchronization rules for accessing them.
//
// (R) Read-only in concurrent operation; no synchronization required.
// (S) Self-synchronizing; access according to class's own rules.
// (M) Reads and writes guarded by _mutex
// (X) Access only allowed from the main flow of control called from run() or constructor.
RandomAccessOplogBuffer* _oplogBuffer; // (S)
bool _batchRequested = false; // (M)
std::shared_ptr<executor::TaskExecutor> _executor; // (R)
const Timestamp _resumeBatchingTs; // (R)
const OpTime _beginApplyingAfterOpTime; // (R)
};
} // namespace repl
} // namespace mongo
|
