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
|
/**
* 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/exec/requires_collection_stage.h"
#include "mongo/db/catalog/collection_catalog.h"
namespace mongo {
template <typename CollectionT>
void RequiresCollectionStageBase<CollectionT>::doSaveState() {
doSaveStateRequiresCollection();
// A stage may not access storage while in a saved state.
_collection = nullptr;
}
template <typename CollectionT>
void RequiresCollectionStageBase<CollectionT>::doRestoreState() {
invariant(!_collection);
// We should be holding a lock associated with the name of the collection prior to yielding,
// even if the collection was renamed during yield.
dassert(getOpCtx()->lockState()->isCollectionLockedForMode(_nss, MODE_IS));
const CollectionCatalog& catalog = CollectionCatalog::get(getOpCtx());
auto newNss = catalog.lookupNSSByUUID(_collectionUUID);
uassert(ErrorCodes::QueryPlanKilled,
str::stream() << "collection dropped. UUID " << _collectionUUID,
newNss);
// TODO SERVER-31695: Allow queries to survive collection rename, rather than throwing here when
// a rename has happened during yield.
uassert(ErrorCodes::QueryPlanKilled,
str::stream() << "collection renamed from '" << _nss << "' to '" << *newNss
<< "'. UUID " << _collectionUUID,
*newNss == _nss);
// At this point we know that the collection name has not changed, and therefore we have
// restored locks on the correct name. It is now safe to restore the Collection pointer. The
// collection must exist, since we already successfully looked up the namespace string by UUID
// under the correct lock manager locks.
_collection = catalog.lookupCollectionByUUID(_collectionUUID);
invariant(_collection);
uassert(ErrorCodes::QueryPlanKilled,
str::stream()
<< "Database epoch changed due to a database-level event such as 'restartCatalog'.",
getDatabaseEpoch(_collection) == _databaseEpoch);
doRestoreStateRequiresCollection();
}
template class RequiresCollectionStageBase<const Collection*>;
template class RequiresCollectionStageBase<Collection*>;
} // namespace mongo
|
