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
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
|
/**
* 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/coll_mod.h"
#include <boost/optional.hpp>
#include <memory>
#include "mongo/bson/simple_bsonelement_comparator.h"
#include "mongo/db/background.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/collection_catalog_entry.h"
#include "mongo/db/catalog/collection_options.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/index_catalog.h"
#include "mongo/db/client.h"
#include "mongo/db/commands/feature_compatibility_version_command_parser.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/recovery_unit.h"
#include "mongo/db/views/view_catalog.h"
#include "mongo/s/catalog/type_collection.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/sharding_initialization.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
struct CollModRequest {
const IndexDescriptor* idx = nullptr;
BSONElement indexExpireAfterSeconds = {};
BSONElement viewPipeLine = {};
std::string viewOn = {};
BSONElement collValidator = {};
std::string collValidationAction = {};
std::string collValidationLevel = {};
BSONElement usePowerOf2Sizes = {};
BSONElement noPadding = {};
};
StatusWith<CollModRequest> parseCollModRequest(OperationContext* opCtx,
const NamespaceString& nss,
Collection* coll,
const BSONObj& cmdObj,
BSONObjBuilder* oplogEntryBuilder) {
bool isView = !coll;
CollModRequest cmr;
BSONForEach(e, cmdObj) {
const auto fieldName = e.fieldNameStringData();
if (Command::isGenericArgument(fieldName)) {
continue; // Don't add to oplog builder.
} else if (fieldName == "collMod") {
// no-op
} else if (fieldName == "index" && !isView) {
BSONObj indexObj = e.Obj();
StringData indexName;
BSONObj keyPattern;
BSONElement nameElem = indexObj["name"];
BSONElement keyPatternElem = indexObj["keyPattern"];
if (nameElem && keyPatternElem) {
return Status(ErrorCodes::InvalidOptions,
"Cannot specify both key pattern and name.");
}
if (!nameElem && !keyPatternElem) {
return Status(ErrorCodes::InvalidOptions,
"Must specify either index name or key pattern.");
}
if (nameElem) {
if (nameElem.type() != BSONType::String) {
return Status(ErrorCodes::InvalidOptions, "Index name must be a string.");
}
indexName = nameElem.valueStringData();
}
if (keyPatternElem) {
if (keyPatternElem.type() != BSONType::Object) {
return Status(ErrorCodes::InvalidOptions, "Key pattern must be an object.");
}
keyPattern = keyPatternElem.embeddedObject();
}
cmr.indexExpireAfterSeconds = indexObj["expireAfterSeconds"];
if (cmr.indexExpireAfterSeconds.eoo()) {
return Status(ErrorCodes::InvalidOptions, "no expireAfterSeconds field");
}
if (!cmr.indexExpireAfterSeconds.isNumber()) {
return Status(ErrorCodes::InvalidOptions,
"expireAfterSeconds field must be a number");
}
if (!indexName.empty()) {
cmr.idx = coll->getIndexCatalog()->findIndexByName(opCtx, indexName);
if (!cmr.idx) {
return Status(ErrorCodes::IndexNotFound,
str::stream() << "cannot find index " << indexName << " for ns "
<< nss.ns());
}
} else {
std::vector<IndexDescriptor*> indexes;
coll->getIndexCatalog()->findIndexesByKeyPattern(
opCtx, keyPattern, false, &indexes);
if (indexes.size() > 1) {
return Status(ErrorCodes::AmbiguousIndexKeyPattern,
str::stream() << "index keyPattern " << keyPattern << " matches "
<< indexes.size()
<< " indexes,"
<< " must use index name. "
<< "Conflicting indexes:"
<< indexes[0]->infoObj()
<< ", "
<< indexes[1]->infoObj());
} else if (indexes.empty()) {
return Status(ErrorCodes::IndexNotFound,
str::stream() << "cannot find index " << keyPattern << " for ns "
<< nss.ns());
}
cmr.idx = indexes[0];
}
BSONElement oldExpireSecs = cmr.idx->infoObj().getField("expireAfterSeconds");
if (oldExpireSecs.eoo()) {
return Status(ErrorCodes::InvalidOptions, "no expireAfterSeconds field to update");
}
if (!oldExpireSecs.isNumber()) {
return Status(ErrorCodes::InvalidOptions,
"existing expireAfterSeconds field is not a number");
}
} else if (fieldName == "validator" && !isView) {
MatchExpressionParser::AllowedFeatureSet allowedFeatures =
MatchExpressionParser::kBanAllSpecialFeatures;
if (!serverGlobalParams.validateFeaturesAsMaster.load() ||
(serverGlobalParams.featureCompatibility.getVersion() ==
ServerGlobalParams::FeatureCompatibility::Version::kFullyUpgradedTo36)) {
// Note that we don't enforce this restriction on the secondary or on backup
// instances, as indicated by !validateFeaturesAsMaster.
allowedFeatures |= MatchExpressionParser::kJSONSchema;
allowedFeatures |= MatchExpressionParser::kExpr;
}
auto statusW = coll->parseValidator(opCtx, e.Obj(), allowedFeatures);
if (!statusW.isOK()) {
if (statusW.getStatus().code() == ErrorCodes::QueryFeatureNotAllowed) {
// The default error message for disallowed $jsonSchema and $expr is not
// descriptive enough, so we rewrite it here.
return {ErrorCodes::QueryFeatureNotAllowed,
str::stream() << "The featureCompatibilityVersion must be 3.6 to add a "
"collection validator using 3.6 query features. See "
<< feature_compatibility_version::kDochubLink
<< "."};
} else {
return statusW.getStatus();
}
}
cmr.collValidator = e;
} else if (fieldName == "validationLevel" && !isView) {
auto statusW = coll->parseValidationLevel(e.String());
if (!statusW.isOK())
return statusW.getStatus();
cmr.collValidationLevel = e.String();
} else if (fieldName == "validationAction" && !isView) {
auto statusW = coll->parseValidationAction(e.String());
if (!statusW.isOK())
return statusW.getStatus();
cmr.collValidationAction = e.String();
} else if (fieldName == "pipeline") {
if (!isView) {
return Status(ErrorCodes::InvalidOptions,
"'pipeline' option only supported on a view");
}
if (e.type() != mongo::Array) {
return Status(ErrorCodes::InvalidOptions, "not a valid aggregation pipeline");
}
cmr.viewPipeLine = e;
} else if (fieldName == "viewOn") {
if (!isView) {
return Status(ErrorCodes::InvalidOptions,
"'viewOn' option only supported on a view");
}
if (e.type() != mongo::String) {
return Status(ErrorCodes::InvalidOptions, "'viewOn' option must be a string");
}
cmr.viewOn = e.str();
} else {
if (isView) {
return Status(ErrorCodes::InvalidOptions,
str::stream() << "option not supported on a view: " << fieldName);
}
// As of SERVER-17312 we only support these two options. When SERVER-17320 is
// resolved this will need to be enhanced to handle other options.
typedef CollectionOptions CO;
if (fieldName == "usePowerOf2Sizes")
cmr.usePowerOf2Sizes = e;
else if (fieldName == "noPadding")
cmr.noPadding = e;
else
return Status(ErrorCodes::InvalidOptions,
str::stream() << "unknown option to collMod: " << fieldName);
}
oplogEntryBuilder->append(e);
}
return {std::move(cmr)};
}
/**
* Set a collection option flag for 'UsePowerOf2Sizes' or 'NoPadding'. Appends both the new and
* old flag setting to the given 'result' builder.
*/
void setCollectionOptionFlag(OperationContext* opCtx,
Collection* coll,
BSONElement& collOptionElement,
BSONObjBuilder* result) {
const StringData flagName = collOptionElement.fieldNameStringData();
int flag;
if (flagName == "usePowerOf2Sizes") {
flag = CollectionOptions::Flag_UsePowerOf2Sizes;
} else if (flagName == "noPadding") {
flag = CollectionOptions::Flag_NoPadding;
} else {
flag = 0;
}
CollectionCatalogEntry* cce = coll->getCatalogEntry();
const int oldFlags = cce->getCollectionOptions(opCtx).flags;
const bool oldSetting = oldFlags & flag;
const bool newSetting = collOptionElement.trueValue();
result->appendBool(flagName.toString() + "_old", oldSetting);
result->appendBool(flagName.toString() + "_new", newSetting);
const int newFlags = newSetting ? (oldFlags | flag) // set flag
: (oldFlags & ~flag); // clear flag
// NOTE we do this unconditionally to ensure that we note that the user has
// explicitly set flags, even if they are just setting the default.
cce->updateFlags(opCtx, newFlags);
const CollectionOptions newOptions = cce->getCollectionOptions(opCtx);
invariant(newOptions.flags == newFlags);
invariant(newOptions.flagsSet);
}
Status _collModInternal(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& cmdObj,
BSONObjBuilder* result,
bool upgradeUUID,
OptionalCollectionUUID uuid) {
StringData dbName = nss.db();
AutoGetDb autoDb(opCtx, dbName, MODE_X);
Database* const db = autoDb.getDb();
Collection* coll = db ? db->getCollection(opCtx, nss) : nullptr;
// May also modify a view instead of a collection.
boost::optional<ViewDefinition> view;
if (db && !coll) {
const auto sharedView = db->getViewCatalog()->lookup(opCtx, nss.ns());
if (sharedView) {
// We copy the ViewDefinition as it is modified below to represent the requested state.
view = {*sharedView};
}
}
// This can kill all cursors so don't allow running it while a background operation is in
// progress.
BackgroundOperation::assertNoBgOpInProgForNs(nss);
// If db/collection/view does not exist, short circuit and return.
if (!db || (!coll && !view)) {
return Status(ErrorCodes::NamespaceNotFound, "ns does not exist");
}
OldClientContext ctx(opCtx, nss.ns());
bool userInitiatedWritesAndNotPrimary = opCtx->writesAreReplicated() &&
!repl::getGlobalReplicationCoordinator()->canAcceptWritesFor(opCtx, nss);
if (userInitiatedWritesAndNotPrimary) {
return Status(ErrorCodes::NotMaster,
str::stream() << "Not primary while setting collection options on "
<< nss.ns());
}
BSONObjBuilder oplogEntryBuilder;
auto statusW = parseCollModRequest(opCtx, nss, coll, cmdObj, &oplogEntryBuilder);
if (!statusW.isOK()) {
return statusW.getStatus();
}
CollModRequest cmr = statusW.getValue();
WriteUnitOfWork wunit(opCtx);
// Handle collMod on a view and return early. The View Catalog handles the creation of oplog
// entries for modifications on a view.
if (view) {
if (!cmr.viewPipeLine.eoo())
view->setPipeline(cmr.viewPipeLine);
if (!cmr.viewOn.empty())
view->setViewOn(NamespaceString(dbName, cmr.viewOn));
ViewCatalog* catalog = db->getViewCatalog();
BSONArrayBuilder pipeline;
for (auto& item : view->pipeline()) {
pipeline.append(item);
}
auto errorStatus =
catalog->modifyView(opCtx, nss, view->viewOn(), BSONArray(pipeline.obj()));
if (!errorStatus.isOK()) {
return errorStatus;
}
wunit.commit();
return Status::OK();
}
// In order to facilitate the replication rollback process, which makes a best effort attempt to
// "undo" a set of oplog operations, we store a snapshot of the old collection options to
// provide to the OpObserver. TTL index updates aren't a part of collection options so we
// save the relevant TTL index data in a separate object.
CollectionOptions oldCollOptions = coll->getCatalogEntry()->getCollectionOptions(opCtx);
boost::optional<TTLCollModInfo> ttlInfo;
// Handle collMod operation type appropriately.
// TTLIndex
if (!cmr.indexExpireAfterSeconds.eoo()) {
BSONElement& newExpireSecs = cmr.indexExpireAfterSeconds;
BSONElement oldExpireSecs = cmr.idx->infoObj().getField("expireAfterSeconds");
if (SimpleBSONElementComparator::kInstance.evaluate(oldExpireSecs != newExpireSecs)) {
result->appendAs(oldExpireSecs, "expireAfterSeconds_old");
// Change the value of "expireAfterSeconds" on disk.
coll->getCatalogEntry()->updateTTLSetting(
opCtx, cmr.idx->indexName(), newExpireSecs.safeNumberLong());
// Notify the index catalog that the definition of this index changed.
cmr.idx = coll->getIndexCatalog()->refreshEntry(opCtx, cmr.idx);
result->appendAs(newExpireSecs, "expireAfterSeconds_new");
}
// Save previous TTL index expiration.
ttlInfo = TTLCollModInfo{Seconds(newExpireSecs.safeNumberLong()),
Seconds(oldExpireSecs.safeNumberLong()),
cmr.idx->indexName()};
}
// Validator
if (!cmr.collValidator.eoo())
coll->setValidator(opCtx, cmr.collValidator.Obj()).transitional_ignore();
// ValidationAction
if (!cmr.collValidationAction.empty())
coll->setValidationAction(opCtx, cmr.collValidationAction).transitional_ignore();
// ValidationLevel
if (!cmr.collValidationLevel.empty())
coll->setValidationLevel(opCtx, cmr.collValidationLevel).transitional_ignore();
// UsePowerof2Sizes
if (!cmr.usePowerOf2Sizes.eoo())
setCollectionOptionFlag(opCtx, coll, cmr.usePowerOf2Sizes, result);
// NoPadding
if (!cmr.noPadding.eoo())
setCollectionOptionFlag(opCtx, coll, cmr.noPadding, result);
// Modify collection UUID if we are upgrading or downgrading. This is a no-op if we have
// already upgraded or downgraded. As we don't assign UUIDs to system.indexes (SERVER-29926),
// don't implicitly upgrade them on collMod either.
if (upgradeUUID && !nss.isSystemDotIndexes()) {
if (uuid && !coll->uuid()) {
CollectionCatalogEntry* cce = coll->getCatalogEntry();
cce->addUUID(opCtx, uuid.get(), coll);
} else if (!uuid && coll->uuid()) {
CollectionCatalogEntry* cce = coll->getCatalogEntry();
cce->removeUUID(opCtx);
}
coll->refreshUUID(opCtx);
}
// Only observe non-view collMods, as view operations are observed as operations on the
// system.views collection.
getGlobalServiceContext()->getOpObserver()->onCollMod(
opCtx, nss, coll->uuid(), oplogEntryBuilder.obj(), oldCollOptions, ttlInfo);
wunit.commit();
return Status::OK();
}
void _updateDatabaseUUIDSchemaVersion(OperationContext* opCtx,
const std::string& dbname,
std::map<std::string, UUID>& collToUUID,
bool needUUIDAdded) {
// Iterate through all collections of database dbname and make necessary UUID changes.
std::vector<NamespaceString> collNamespaceStrings;
{
AutoGetDb autoDb(opCtx, dbname, MODE_X);
Database* const db = autoDb.getDb();
// If the database no longer exists, we're done with upgrading.
if (!db) {
return;
}
for (auto collectionIt = db->begin(); collectionIt != db->end(); ++collectionIt) {
Collection* coll = *collectionIt;
collNamespaceStrings.push_back(coll->ns());
}
}
for (auto& collNSS : collNamespaceStrings) {
// Skip system.namespaces until SERVER-30095 is addressed.
if (collNSS.coll() == "system.namespaces") {
continue;
}
// Skip all non-replicated collections.
if (collNSS.db() == "local" || collNSS.coll() == "system.profile") {
continue;
}
AutoGetDb autoDb(opCtx, dbname, MODE_X);
Database* const db = autoDb.getDb();
Collection* coll = db ? db->getCollection(opCtx, collNSS) : nullptr;
// If the collection no longer exists, skip it.
if (!coll) {
continue;
}
BSONObjBuilder collModObjBuilder;
collModObjBuilder.append("collMod", coll->ns().coll());
BSONObj collModObj = collModObjBuilder.done();
OptionalCollectionUUID uuid = boost::none;
if (needUUIDAdded) {
if (collToUUID.find(collNSS.coll().toString()) != collToUUID.end()) {
// This is a sharded collection. Use the UUID generated by the config server.
uuid = collToUUID[collNSS.coll().toString()];
} else {
// This is an unsharded collection. Generate a UUID.
uuid = UUID::gen();
}
}
if ((needUUIDAdded && !coll->uuid()) || (!needUUIDAdded && coll->uuid())) {
uassertStatusOK(collModForUUIDUpgrade(opCtx, coll->ns(), collModObj, uuid));
}
}
}
Status _updateDatabaseUUIDSchemaVersionNonReplicated(OperationContext* opCtx,
const std::string& dbname,
bool needUUIDAdded) {
// Iterate through all collections if we're in the "local" database.
std::vector<NamespaceString> collNamespaceStrings;
if (dbname == "local") {
AutoGetDb autoDb(opCtx, dbname, MODE_X);
Database* const db = autoDb.getDb();
if (!db) {
return Status(ErrorCodes::NamespaceNotFound,
str::stream() << "database " << dbname << " does not exist");
}
for (auto collectionIt = db->begin(); collectionIt != db->end(); ++collectionIt) {
Collection* coll = *collectionIt;
collNamespaceStrings.push_back(coll->ns());
}
} else {
// If we're not in the "local" database, the only non-replicated collection
// is system.profile, if present.
collNamespaceStrings.push_back(NamespaceString(dbname, "system.profile"));
}
for (auto& collNSS : collNamespaceStrings) {
// Skip system.namespaces until SERVER-30095 is addressed.
if (collNSS.coll() == "system.namespaces") {
continue;
}
AutoGetDb autoDb(opCtx, dbname, MODE_X);
Database* const db = autoDb.getDb();
Collection* coll = db ? db->getCollection(opCtx, collNSS) : nullptr;
if (!coll) {
// If the collection or database was dropped, or if we incorrectly assumed there was
// a system.profile collection present, continue.
continue;
}
BSONObjBuilder collModObjBuilder;
collModObjBuilder.append("collMod", coll->ns().coll());
BSONObj collModObj = collModObjBuilder.done();
OptionalCollectionUUID uuid = boost::none;
if (needUUIDAdded) {
uuid = UUID::gen();
}
if ((needUUIDAdded && !coll->uuid()) || (!needUUIDAdded && coll->uuid())) {
BSONObjBuilder resultWeDontCareAbout;
auto collModStatus = _collModInternal(
opCtx, coll->ns(), collModObj, &resultWeDontCareAbout, /*upgradeUUID*/ true, uuid);
if (!collModStatus.isOK()) {
return collModStatus;
}
}
}
return Status::OK();
}
} // namespace
Status collMod(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& cmdObj,
BSONObjBuilder* result) {
return _collModInternal(
opCtx, nss, cmdObj, result, /*upgradeUUID*/ false, /*UUID*/ boost::none);
}
Status collModForUUIDUpgrade(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& cmdObj,
OptionalCollectionUUID uuid) {
BSONObjBuilder resultWeDontCareAbout;
// Update all non-replicated collection UUIDs.
if (nss.ns() == "admin.system.version") {
auto schemaStatus = updateUUIDSchemaVersionNonReplicated(opCtx, !!uuid);
if (!schemaStatus.isOK()) {
return schemaStatus;
}
}
return _collModInternal(opCtx, nss, cmdObj, &resultWeDontCareAbout, /*upgradeUUID*/ true, uuid);
}
void updateUUIDSchemaVersion(OperationContext* opCtx, bool upgrade) {
if (!enableCollectionUUIDs) {
return;
}
// A map of the form { db1: { collB: UUID, collA: UUID, ... }, db2: { ... } }
std::map<std::string, std::map<std::string, UUID>> dbToCollToUUID;
if (upgrade && ShardingState::get(opCtx)->enabled()) {
log() << "obtaining UUIDs for pre-existing sharded collections from config server";
// Get UUIDs for all existing sharded collections from the config server. Since the sharded
// collections are not stored per-database in config.collections, it's more efficient to
// read all the collections at once than to read them by database.
auto shardedColls =
uassertStatusOK(
Grid::get(opCtx)->shardRegistry()->getConfigShard()->exhaustiveFindOnConfig(
opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
repl::ReadConcernLevel::kMajorityReadConcern,
NamespaceString(CollectionType::ConfigNS),
BSON("dropped" << false), // query
BSONObj(), // sort
boost::none // limit
))
.docs;
for (const auto& coll : shardedColls) {
auto collType = uassertStatusOK(CollectionType::fromBSON(coll));
uassert(ErrorCodes::InternalError,
str::stream() << "expected entry " << coll << " in config.collections for "
<< collType.getNs().ns()
<< " to have a UUID, but it did not",
collType.getUUID());
dbToCollToUUID[collType.getNs().db().toString()][collType.getNs().coll().toString()] =
*collType.getUUID();
}
}
// Update UUIDs on all collections of all databases.
std::vector<std::string> dbNames;
StorageEngine* storageEngine = opCtx->getServiceContext()->getGlobalStorageEngine();
{
Lock::GlobalLock lk(opCtx, MODE_IS, UINT_MAX);
storageEngine->listDatabases(&dbNames);
}
for (auto it = dbNames.begin(); it != dbNames.end(); ++it) {
auto dbName = *it;
_updateDatabaseUUIDSchemaVersion(opCtx, dbName, dbToCollToUUID[dbName], upgrade);
}
const WriteConcernOptions writeConcern(WriteConcernOptions::kMajority,
WriteConcernOptions::SyncMode::UNSET,
/*timeout*/ INT_MAX);
repl::getGlobalReplicationCoordinator()->awaitReplicationOfLastOpForClient(opCtx, writeConcern);
}
Status updateUUIDSchemaVersionNonReplicated(OperationContext* opCtx, bool upgrade) {
if (!enableCollectionUUIDs) {
return Status::OK();
}
// Update UUIDs on all collections of all non-replicated databases.
std::vector<std::string> dbNames;
StorageEngine* storageEngine = opCtx->getServiceContext()->getGlobalStorageEngine();
{
Lock::GlobalLock lk(opCtx, MODE_IS, UINT_MAX);
storageEngine->listDatabases(&dbNames);
}
for (auto it = dbNames.begin(); it != dbNames.end(); ++it) {
auto dbName = *it;
auto schemaStatus = _updateDatabaseUUIDSchemaVersionNonReplicated(opCtx, dbName, upgrade);
if (!schemaStatus.isOK()) {
return schemaStatus;
}
}
return Status::OK();
}
} // namespace mongo
|