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/**
* 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
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