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
|
/**
* 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 <cstdint>
#include <vector>
#include "mongo/bson/bsonobj.h"
#include "mongo/db/catalog/index_catalog_entry.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/storage/key_string.h"
#include "mongo/db/storage/temporary_record_store.h"
namespace mongo {
class IndexCatalogEntry;
/**
* Records keys that have violated duplicate key constraints on unique indexes. The keys are backed
* by a temporary table that is created and destroyed by this tracker.
*/
class DuplicateKeyTracker {
DuplicateKeyTracker(const DuplicateKeyTracker&) = delete;
DuplicateKeyTracker& operator=(const DuplicateKeyTracker&) = delete;
public:
/**
* Creates a temporary table in which to store any duplicate key constraint violations.
*/
DuplicateKeyTracker(OperationContext* opCtx, const IndexCatalogEntry* indexCatalogEntry);
/**
* Finds the temporary table associated with storing any duplicate key constraint violations for
* this index build. Only used when resuming an index build and the temporary table already
* exists on disk.
*/
DuplicateKeyTracker(OperationContext* opCtx,
const IndexCatalogEntry* indexCatalogEntry,
StringData ident);
/**
* Keeps the temporary table for the duplicate key constraint violations.
*/
void keepTemporaryTable();
/**
* Given a duplicate key, insert it into the key constraint table.
*/
Status recordKey(OperationContext* opCtx, const KeyString::Value& key);
/**
* Returns Status::OK if all previously recorded duplicate key constraint violations have been
* resolved for the index. Returns a DuplicateKey error if there are still duplicate key
* constraint violations on the index.
*
* Must not be in a WriteUnitOfWork.
*/
Status checkConstraints(OperationContext* opCtx) const;
std::string getTableIdent() const {
return _keyConstraintsTable->rs()->getIdent();
}
private:
const IndexCatalogEntry* _indexCatalogEntry;
AtomicWord<long long> _duplicateCounter{0};
// This temporary record store is owned by the duplicate key tracker and dropped along with it.
std::unique_ptr<TemporaryRecordStore> _keyConstraintsTable;
};
} // namespace mongo
|
