summaryrefslogtreecommitdiff
path: root/src/mongo/db/s/cleanup_orphaned_cmd.cpp
blob: 34851c208ba58bc45f14793966217d5ce5e519d7 (plain)
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
/**
 *    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 <boost/optional.hpp>

#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog_raii.h"
#include "mongo/db/commands.h"
#include "mongo/db/field_parser.h"
#include "mongo/db/s/collection_sharding_runtime.h"
#include "mongo/db/s/migration_util.h"
#include "mongo/db/s/shard_filtering_metadata_refresh.h"
#include "mongo/db/s/sharding_runtime_d_params_gen.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/service_context.h"
#include "mongo/logv2/log.h"

#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kCommand

namespace mongo {
namespace {

enum class CleanupResult { kDone, kContinue, kError };

/**
 * Waits for all possibly orphaned ranges on 'nss' to be cleaned up.
 *
 * @return CleanupResult::kDone if no orphaned ranges remain
 * @return CleanupResult::kError and 'errMsg' if an error occurred
 *
 * If the collection is not sharded, returns CleanupResult::kDone.
 */
CleanupResult cleanupOrphanedData(OperationContext* opCtx,
                                  const NamespaceString& ns,
                                  const BSONObj& startingFromKeyConst,
                                  std::string* errMsg) {
    boost::optional<ChunkRange> range;
    boost::optional<UUID> collectionUuid;
    {
        AutoGetCollection autoColl(opCtx, ns, MODE_IX);
        if (!autoColl.getCollection()) {
            LOGV2(4416000,
                  "cleanupOrphaned skipping waiting for orphaned data cleanup because "
                  "{namespace} does not exist",
                  "cleanupOrphaned skipping waiting for orphaned data cleanup because "
                  "collection does not exist",
                  logAttrs(ns));
            return CleanupResult::kDone;
        }
        collectionUuid.emplace(autoColl.getCollection()->uuid());

        const auto scopedCsr =
            CollectionShardingRuntime::assertCollectionLockedAndAcquireShared(opCtx, ns);
        auto optCollDescr = scopedCsr->getCurrentMetadataIfKnown();
        if (!optCollDescr || !optCollDescr->isSharded()) {
            LOGV2(4416001,
                  "cleanupOrphaned skipping waiting for orphaned data cleanup because "
                  "{namespace} is not sharded",
                  "cleanupOrphaned skipping waiting for orphaned data cleanup because "
                  "collection is not sharded",
                  logAttrs(ns));
            return CleanupResult::kDone;
        }
        range.emplace(optCollDescr->getMinKey(), optCollDescr->getMaxKey());

        // Though the 'startingFromKey' parameter is not used as the min key of the range to
        // wait for, we still validate that 'startingFromKey' in the same way as the original
        // cleanupOrphaned logic did if 'startingFromKey' is present.
        BSONObj keyPattern = optCollDescr->getKeyPattern();
        if (!startingFromKeyConst.isEmpty() && !optCollDescr->isValidKey(startingFromKeyConst)) {
            LOGV2_ERROR_OPTIONS(
                4416002,
                {logv2::UserAssertAfterLog(ErrorCodes::OrphanedRangeCleanUpFailed)},
                "Could not cleanup orphaned data because start key does not match shard key "
                "pattern",
                "startKey"_attr = redact(startingFromKeyConst),
                "shardKeyPattern"_attr = keyPattern);
        }
    }

    // We actually want to wait until there are no range deletion tasks for this namespace/UUID,
    // but we don't have a good way to wait for that event, so instead we wait for there to be
    // no tasks being processed in memory for this namespace/UUID.
    // However, it's possible this node has recently stepped up, and the stepup recovery task to
    // resubmit range deletion tasks for processing has not yet completed. In that case,
    // waitForClean will return though there are still tasks in config.rangeDeletions, so we
    // sleep for a short time and then try waitForClean again.
    while (auto numRemainingDeletionTasks =
               migrationutil::checkForConflictingDeletions(opCtx, *range, *collectionUuid)) {
        uassert(ErrorCodes::ResumableRangeDeleterDisabled,
                "Failing cleanupOrphaned because the disableResumableRangeDeleter server parameter "
                "is set to true and this shard contains range deletion tasks for the collection.",
                !disableResumableRangeDeleter.load());

        LOGV2(4416003,
              "cleanupOrphaned going to wait for range deletion tasks to complete",
              logAttrs(ns),
              "collectionUUID"_attr = *collectionUuid,
              "numRemainingDeletionTasks"_attr = numRemainingDeletionTasks);

        auto status = CollectionShardingRuntime::waitForClean(
            opCtx, ns, *collectionUuid, *range, Date_t::max());

        if (!status.isOK()) {
            *errMsg = status.reason();
            return CleanupResult::kError;
        }

        opCtx->sleepFor(Milliseconds(1000));
    }

    return CleanupResult::kDone;
}

/**
 * Called on a particular namespace, and if the collection is sharded will wait for the number of
 * range deletion tasks on the collection on this shard to reach zero.
 *
 * Since the sharding state may change after this call returns, there is no guarantee that orphans
 * won't re-appear as a result of migrations that commit after this call returns.
 *
 * Safe to call with the balancer on.
 */
class CleanupOrphanedCommand : public ErrmsgCommandDeprecated {
public:
    CleanupOrphanedCommand() : ErrmsgCommandDeprecated("cleanupOrphaned") {}

    AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
        return AllowedOnSecondary::kNever;
    }

    bool adminOnly() const override {
        return true;
    }

    Status checkAuthForOperation(OperationContext* opCtx,
                                 const DatabaseName&,
                                 const BSONObj&) const override {
        if (!AuthorizationSession::get(opCtx->getClient())
                 ->isAuthorizedForActionsOnResource(ResourcePattern::forClusterResource(),
                                                    ActionType::cleanupOrphaned)) {
            return Status(ErrorCodes::Unauthorized, "Not authorized for cleanupOrphaned command.");
        }
        return Status::OK();
    }

    bool supportsWriteConcern(const BSONObj& cmd) const override {
        return true;
    }

    // Input
    static BSONField<std::string> nsField;
    static BSONField<BSONObj> startingFromKeyField;

    bool errmsgRun(OperationContext* opCtx,
                   std::string const& db,
                   const BSONObj& cmdObj,
                   std::string& errmsg,
                   BSONObjBuilder& result) override {
        std::string ns;
        if (!FieldParser::extract(cmdObj, nsField, &ns, &errmsg)) {
            return false;
        }

        const NamespaceString nss(ns);
        uassert(ErrorCodes::InvalidNamespace,
                str::stream() << "Invalid namespace: " << nss.toStringForErrorMsg(),
                nss.isValid());

        BSONObj startingFromKey;
        if (!FieldParser::extract(cmdObj, startingFromKeyField, &startingFromKey, &errmsg)) {
            return false;
        }

        ShardingState* const shardingState = ShardingState::get(opCtx);

        if (!shardingState->enabled()) {
            errmsg = str::stream() << "server is not part of a sharded cluster or "
                                   << "the sharding metadata is not yet initialized.";
            return false;
        }

        onCollectionPlacementVersionMismatch(opCtx, nss, boost::none);

        CleanupResult cleanupResult = cleanupOrphanedData(opCtx, nss, startingFromKey, &errmsg);

        if (cleanupResult == CleanupResult::kError) {
            return false;
        }
        dassert(cleanupResult == CleanupResult::kDone);

        return true;
    }

} cleanupOrphanedCmd;

BSONField<std::string> CleanupOrphanedCommand::nsField("cleanupOrphaned");
BSONField<BSONObj> CleanupOrphanedCommand::startingFromKeyField("startingFromKey");

}  // namespace
}  // namespace mongo