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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/**
* Copyright (C) 2015 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include "mongo/db/catalog/drop_database.h"
#include <algorithm>
#include "mongo/db/background.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/client.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/op_observer.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/service_context.h"
#include "mongo/db/write_concern_options.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
namespace {
// This is used to wait for the collection drops to replicate to a majority of the replica set.
// Note: Even though we're setting UNSET here, kMajority implies JOURNAL if journaling is supported
// by mongod and writeConcernMajorityJournalDefault is set to true in the ReplSetConfig.
const WriteConcernOptions kDropDatabaseWriteConcern(WriteConcernOptions::kMajority,
WriteConcernOptions::SyncMode::UNSET,
Minutes(10));
/**
* Removes database from catalog and writes dropDatabase entry to oplog.
*/
Status _finishDropDatabase(OperationContext* opCtx, const std::string& dbName, Database* db) {
// If Database::dropDatabase() fails, we should reset the drop-pending state on Database.
auto dropPendingGuard = MakeGuard([db, opCtx] { db->setDropPending(opCtx, false); });
Database::dropDatabase(opCtx, db);
dropPendingGuard.Dismiss();
log() << "dropDatabase " << dbName << " - finished";
WriteUnitOfWork wunit(opCtx);
getGlobalServiceContext()->getOpObserver()->onDropDatabase(opCtx, dbName);
wunit.commit();
return Status::OK();
}
} // namespace
Status dropDatabase(OperationContext* opCtx, const std::string& dbName) {
uassert(ErrorCodes::IllegalOperation,
"Cannot drop a database in read-only mode",
!storageGlobalParams.readOnly);
// TODO (Kal): OldClientContext legacy, needs to be removed
{
CurOp::get(opCtx)->ensureStarted();
stdx::lock_guard<Client> lk(*opCtx->getClient());
CurOp::get(opCtx)->setNS_inlock(dbName);
}
auto replCoord = repl::ReplicationCoordinator::get(opCtx);
std::size_t numCollectionsToDrop = 0;
// We have to wait for the last drop-pending collection to be removed if there are no
// collections to drop.
repl::OpTime latestDropPendingOpTime;
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
Lock::GlobalWrite lk(opCtx);
AutoGetDb autoDB(opCtx, dbName, MODE_X);
Database* const db = autoDB.getDb();
if (!db) {
return Status(ErrorCodes::NamespaceNotFound,
str::stream() << "Could not drop database " << dbName
<< " because it does not exist");
}
bool userInitiatedWritesAndNotPrimary =
opCtx->writesAreReplicated() && !replCoord->canAcceptWritesForDatabase(opCtx, dbName);
if (userInitiatedWritesAndNotPrimary) {
return Status(ErrorCodes::NotMaster,
str::stream() << "Not primary while dropping database " << dbName);
}
log() << "dropDatabase " << dbName << " - starting";
db->setDropPending(opCtx, true);
// If Database::dropCollectionEventIfSystem() fails, we should reset the drop-pending state
// on Database.
auto dropPendingGuard = MakeGuard([&db, opCtx] { db->setDropPending(opCtx, false); });
for (auto collection : *db) {
const auto& nss = collection->ns();
if (nss.isDropPendingNamespace() && replCoord->isReplEnabled() &&
opCtx->writesAreReplicated()) {
log() << "dropDatabase " << dbName << " - found drop-pending collection: " << nss;
latestDropPendingOpTime = std::max(
latestDropPendingOpTime, uassertStatusOK(nss.getDropPendingNamespaceOpTime()));
continue;
}
if (replCoord->isOplogDisabledFor(opCtx, nss) || nss.isSystemDotIndexes()) {
continue;
}
log() << "dropDatabase " << dbName << " - dropping collection: " << nss;
WriteUnitOfWork wunit(opCtx);
fassertStatusOK(40476, db->dropCollectionEvenIfSystem(opCtx, nss));
wunit.commit();
numCollectionsToDrop++;
}
dropPendingGuard.Dismiss();
// If there are no collection drops to wait for, we complete the drop database operation.
if (numCollectionsToDrop == 0U && latestDropPendingOpTime.isNull()) {
return _finishDropDatabase(opCtx, dbName, db);
}
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(opCtx, "dropDatabase_collection", dbName);
// If waitForWriteConcern() returns an error or throws an exception, we should reset the
// drop-pending state on Database.
auto dropPendingGuardWhileAwaitingReplication = MakeGuard([dbName, opCtx] {
Lock::GlobalWrite lk(opCtx);
AutoGetDb autoDB(opCtx, dbName, MODE_X);
if (auto db = autoDB.getDb()) {
db->setDropPending(opCtx, false);
}
});
if (numCollectionsToDrop > 0U) {
auto status =
replCoord->awaitReplicationOfLastOpForClient(opCtx, kDropDatabaseWriteConcern).status;
if (!status.isOK()) {
return Status(status.code(),
str::stream() << "dropDatabase " << dbName << " failed waiting for "
<< numCollectionsToDrop
<< " collection drops to replicate: "
<< status.reason());
}
log() << "dropDatabase " << dbName << " - successfully dropped " << numCollectionsToDrop
<< " collections. dropping database";
} else {
invariant(!latestDropPendingOpTime.isNull());
auto status =
replCoord->awaitReplication(opCtx, latestDropPendingOpTime, kDropDatabaseWriteConcern)
.status;
if (!status.isOK()) {
return Status(
status.code(),
str::stream()
<< "dropDatabase "
<< dbName
<< " failed waiting for pending collection drops (most recent drop optime: "
<< latestDropPendingOpTime.toString()
<< ") to replicate: "
<< status.reason());
}
log() << "dropDatabase " << dbName
<< " - pending collection drops completed. dropping database";
}
dropPendingGuardWhileAwaitingReplication.Dismiss();
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
Lock::GlobalWrite lk(opCtx);
AutoGetDb autoDB(opCtx, dbName, MODE_X);
if (auto db = autoDB.getDb()) {
return _finishDropDatabase(opCtx, dbName, db);
}
return Status(ErrorCodes::NamespaceNotFound,
str::stream() << "Could not drop database " << dbName
<< " because it does not exist after dropping "
<< numCollectionsToDrop
<< " collection(s).");
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(opCtx, "dropDatabase_database", dbName);
MONGO_UNREACHABLE;
}
} // namespace mongo
|
