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/**
* Copyright (C) 2021-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 "mongo/platform/basic.h"
#include "mongo/db/s/move_primary_coordinator.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/s/move_primary_source_manager.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/write_block_bypass.h"
#include "mongo/logv2/log.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/shard_id.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
MovePrimaryCoordinator::MovePrimaryCoordinator(ShardingDDLCoordinatorService* service,
const BSONObj& initialState)
: ShardingDDLCoordinator(service, initialState),
_doc(MovePrimaryCoordinatorDocument::parse(
IDLParserErrorContext("MovePrimaryCoordinatorDocument"), initialState)) {}
boost::optional<BSONObj> MovePrimaryCoordinator::reportForCurrentOp(
MongoProcessInterface::CurrentOpConnectionsMode connMode,
MongoProcessInterface::CurrentOpSessionsMode sessionMode) noexcept {
BSONObjBuilder cmdBob;
if (const auto& optComment = getForwardableOpMetadata().getComment()) {
cmdBob.append(optComment.get().firstElement());
}
cmdBob.append("request", BSON(_doc.kToShardIdFieldName << _doc.getToShardId()));
BSONObjBuilder bob;
bob.append("type", "op");
bob.append("desc", "MovePrimaryCoordinator");
bob.append("op", "command");
bob.append("ns", nss().toString());
bob.append("command", cmdBob.obj());
bob.append("active", true);
return bob.obj();
}
void MovePrimaryCoordinator::checkIfOptionsConflict(const BSONObj& doc) const {
// If we have two shard collections on the same namespace, then the arguments must be the same.
const auto otherDoc = MovePrimaryCoordinatorDocument::parse(
IDLParserErrorContext("MovePrimaryCoordinatorDocument"), doc);
uassert(
ErrorCodes::ConflictingOperationInProgress,
"Another move primary with different arguments is already running for the same namespace",
_doc.getToShardId() == otherDoc.getToShardId());
}
ExecutorFuture<void> MovePrimaryCoordinator::_runImpl(
std::shared_ptr<executor::ScopedTaskExecutor> executor,
const CancellationToken& token) noexcept {
return ExecutorFuture<void>(**executor)
.then([this, anchor = shared_from_this()] {
auto opCtxHolder = cc().makeOperationContext();
auto* opCtx = opCtxHolder.get();
getForwardableOpMetadata().setOn(opCtx);
// Any error should terminate the coordinator, even if it is a retryable error, this way
// we have a movePrimary with a similar behavior of the previous one.
_completeOnError = true;
auto const shardRegistry = Grid::get(opCtx)->shardRegistry();
// Make sure we're as up-to-date as possible with shard information. This catches the
// case where we might have changed a shard's host by removing/adding a shard with the
// same name.
shardRegistry->reload(opCtx);
const auto& dbName = nss().db();
const auto& toShard =
uassertStatusOK(shardRegistry->getShard(opCtx, _doc.getToShardId()));
const auto& selfShardId = ShardingState::get(opCtx)->shardId();
if (selfShardId == toShard->getId()) {
LOGV2(5275803,
"Database already on the requested primary shard",
"db"_attr = dbName,
"shardId"_attr = _doc.getToShardId());
// The database primary is already the `to` shard
return;
}
// Enable write blocking bypass to allow cloning and droping the stale collections even
// if user writes are currently disallowed.
WriteBlockBypass::get(opCtx).set(true);
ShardMovePrimary movePrimaryRequest(nss(), _doc.getToShardId().toString());
auto primaryId = selfShardId;
auto toId = toShard->getId();
MovePrimarySourceManager movePrimarySourceManager(
opCtx, movePrimaryRequest, dbName, primaryId, toId);
uassertStatusOK(movePrimarySourceManager.clone(opCtx));
uassertStatusOK(movePrimarySourceManager.enterCriticalSection(opCtx));
uassertStatusOK(movePrimarySourceManager.commitOnConfig(opCtx));
uassertStatusOK(movePrimarySourceManager.cleanStaleData(opCtx));
})
.onError([this, anchor = shared_from_this()](const Status& status) {
LOGV2_ERROR(5275804,
"Error running move primary",
"database"_attr = nss().db(),
"to"_attr = _doc.getToShardId(),
"error"_attr = redact(status));
return status;
});
}
} // namespace mongo
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