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
|
/**
* 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kQuery
#include "mongo/platform/basic.h"
#include "mongo/db/pipeline/process_interface_shardsvr.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/catalog/document_validation.h"
#include "mongo/db/catalog/uuid_catalog.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/ops/write_ops_exec.h"
#include "mongo/db/ops/write_ops_gen.h"
#include "mongo/db/pipeline/sharded_agg_helpers.h"
#include "mongo/db/query/query_knobs_gen.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/transaction_participant.h"
#include "mongo/s/catalog_cache.h"
#include "mongo/s/cluster_commands_helpers.h"
#include "mongo/s/grid.h"
#include "mongo/s/query/document_source_merge_cursors.h"
#include "mongo/s/write_ops/cluster_write.h"
#include "mongo/util/log.h"
namespace mongo {
using boost::intrusive_ptr;
using std::shared_ptr;
using std::string;
using std::unique_ptr;
using write_ops::Insert;
using write_ops::Update;
using write_ops::UpdateOpEntry;
namespace {
// Attaches the write concern to the given batch request. If it looks like 'writeConcern' has
// been default initialized to {w: 0, wtimeout: 0} then we do not bother attaching it.
void attachWriteConcern(BatchedCommandRequest* request, const WriteConcernOptions& writeConcern) {
if (!writeConcern.wMode.empty() || writeConcern.wNumNodes > 0) {
request->setWriteConcern(writeConcern.toBSON());
}
}
} // namespace
void MongoInterfaceShardServer::checkRoutingInfoEpochOrThrow(
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& nss,
ChunkVersion targetCollectionVersion) const {
auto catalogCache = Grid::get(expCtx->opCtx)->catalogCache();
return catalogCache->checkEpochOrThrow(nss, targetCollectionVersion);
}
std::pair<std::vector<FieldPath>, bool>
MongoInterfaceShardServer::collectDocumentKeyFieldsForHostedCollection(OperationContext* opCtx,
const NamespaceString& nss,
UUID uuid) const {
invariant(serverGlobalParams.clusterRole == ClusterRole::ShardServer);
const auto metadata = [opCtx, &nss]() -> ScopedCollectionMetadata {
Lock::DBLock dbLock(opCtx, nss.db(), MODE_IS);
Lock::CollectionLock collLock(opCtx->lockState(), nss.ns(), MODE_IS);
return CollectionShardingState::get(opCtx, nss)->getCurrentMetadata();
}();
if (!metadata->isSharded() || !metadata->uuidMatches(uuid)) {
// An unsharded collection can still become sharded so is not final. If the uuid doesn't
// match the one stored in the ScopedCollectionMetadata, this implies that the collection
// has been dropped and recreated as sharded. We don't know what the old document key fields
// might have been in this case so we return just _id.
return {{"_id"}, false};
}
// Unpack the shard key. Collection is now sharded so the document key fields will never change,
// mark as final.
return {_shardKeyToDocumentKeyFields(metadata->getKeyPatternFields()), true};
}
void MongoInterfaceShardServer::insert(const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& ns,
std::vector<BSONObj>&& objs,
const WriteConcernOptions& wc,
boost::optional<OID> targetEpoch) {
BatchedCommandResponse response;
BatchWriteExecStats stats;
BatchedCommandRequest insertCommand(
buildInsertOp(ns, std::move(objs), expCtx->bypassDocumentValidation));
// If applicable, attach a write concern to the batched command request.
attachWriteConcern(&insertCommand, wc);
ClusterWriter::write(expCtx->opCtx, insertCommand, &stats, &response, targetEpoch);
// TODO SERVER-35403: Add more context for which shard produced the error.
uassertStatusOKWithContext(response.toStatus(), "Insert failed: ");
}
void MongoInterfaceShardServer::update(const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& ns,
std::vector<BSONObj>&& queries,
std::vector<BSONObj>&& updates,
const WriteConcernOptions& wc,
bool upsert,
bool multi,
boost::optional<OID> targetEpoch) {
BatchedCommandResponse response;
BatchWriteExecStats stats;
BatchedCommandRequest updateCommand(buildUpdateOp(ns,
std::move(queries),
std::move(updates),
upsert,
multi,
expCtx->bypassDocumentValidation));
// If applicable, attach a write concern to the batched command request.
attachWriteConcern(&updateCommand, wc);
ClusterWriter::write(expCtx->opCtx, updateCommand, &stats, &response, targetEpoch);
// TODO SERVER-35403: Add more context for which shard produced the error.
uassertStatusOKWithContext(response.toStatus(), "Update failed: ");
}
unique_ptr<Pipeline, PipelineDeleter> MongoInterfaceShardServer::attachCursorSourceToPipeline(
const boost::intrusive_ptr<ExpressionContext>& expCtx, Pipeline* ownedPipeline) {
std::unique_ptr<Pipeline, PipelineDeleter> pipeline(ownedPipeline,
PipelineDeleter(expCtx->opCtx));
invariant(pipeline->getSources().empty() ||
!dynamic_cast<DocumentSourceMergeCursors*>(pipeline->getSources().front().get()));
// $lookup on a sharded collection is not allowed in a transaction. We assume that if we're in
// a transaction, the foreign collection is unsharded. Otherwise, we may access the catalog
// cache, and attempt to do a network request while holding locks.
// TODO: SERVER-39162 allow $lookup in sharded transactions.
auto txnParticipant = TransactionParticipant::get(expCtx->opCtx);
const bool inTxn = txnParticipant && txnParticipant.inMultiDocumentTransaction();
const bool isSharded = [&]() {
if (inTxn || !ShardingState::get(expCtx->opCtx)->enabled()) {
// Sharding isn't enabled or we're in a transaction. In either case we assume it's
// unsharded.
return false;
} else if (expCtx->ns.db() == "local") {
// This may be a change stream examining the oplog. We know the oplog (or any local
// collections for that matter) will never be sharded.
return false;
}
return uassertStatusOK(getCollectionRoutingInfoForTxnCmd(expCtx->opCtx, expCtx->ns)).cm() !=
nullptr;
}();
if (isSharded) {
const bool foreignShardedAllowed =
getTestCommandsEnabled() && internalQueryAllowShardedLookup.load();
if (foreignShardedAllowed) {
// For a sharded collection we may have to establish cursors on a remote host.
return sharded_agg_helpers::targetShardsAndAddMergeCursors(expCtx, pipeline.release());
}
uasserted(51069, "Cannot run $lookup with sharded foreign collection");
}
// Perform a "local read", the same as if we weren't a shard server.
// TODO SERVER-39015 we should do a shard version check here after we acquire a lock within
// this function, to be sure the collection didn't become sharded between the time we checked
// whether it's sharded and the time we took the lock.
return MongoInterfaceStandalone::attachCursorSourceToPipeline(expCtx, pipeline.release());
}
} // namespace mongo
|