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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/sharding_util.h"
#include <fmt/format.h>
#include "mongo/db/commands.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/s/type_shard_collection.h"
#include "mongo/logv2/log.h"
#include "mongo/s/catalog/type_collection.h"
#include "mongo/s/request_types/flush_routing_table_cache_updates_gen.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
namespace sharding_util {
using namespace fmt::literals;
void tellShardsToRefreshCollection(OperationContext* opCtx,
const std::vector<ShardId>& shardIds,
const NamespaceString& nss,
const std::shared_ptr<executor::TaskExecutor>& executor) {
auto cmd = FlushRoutingTableCacheUpdatesWithWriteConcern(nss);
cmd.setSyncFromConfig(true);
cmd.setDbName(nss.db());
auto cmdObj = CommandHelpers::appendMajorityWriteConcern(cmd.toBSON({}));
sendCommandToShards(opCtx, NamespaceString::kAdminDb, cmdObj, shardIds, executor);
}
std::vector<AsyncRequestsSender::Response> sendCommandToShards(
OperationContext* opCtx,
StringData dbName,
const BSONObj& command,
const std::vector<ShardId>& shardIds,
const std::shared_ptr<executor::TaskExecutor>& executor) {
std::vector<AsyncRequestsSender::Request> requests;
for (const auto& shardId : shardIds) {
requests.emplace_back(shardId, command);
}
std::vector<AsyncRequestsSender::Response> responses;
if (!requests.empty()) {
// The _flushRoutingTableCacheUpdatesWithWriteConcern command will fail with a
// QueryPlanKilled error response if the config.cache.chunks collection is dropped
// concurrently. The config.cache.chunks collection is dropped by the shard when it detects
// the sharded collection's epoch having changed. We use kIdempotentOrCursorInvalidated so
// the ARS automatically retries in that situation.
AsyncRequestsSender ars(opCtx,
executor,
dbName,
requests,
ReadPreferenceSetting(ReadPreference::PrimaryOnly),
Shard::RetryPolicy::kIdempotentOrCursorInvalidated,
nullptr /* resourceYielder */);
while (!ars.done()) {
// Retrieve the responses and throw at the first failure.
auto response = ars.next();
const auto errorContext = "Failed command {} for database '{}' on shard '{}'"_format(
command.toString(), dbName, StringData{response.shardId});
auto shardResponse =
uassertStatusOKWithContext(std::move(response.swResponse), errorContext);
auto status = getStatusFromCommandResult(shardResponse.data);
uassertStatusOKWithContext(status, errorContext);
auto wcStatus = getWriteConcernStatusFromCommandResult(shardResponse.data);
uassertStatusOKWithContext(wcStatus, errorContext);
responses.push_back(std::move(response));
}
}
return responses;
}
void downgradeCollectionBalancingFieldsToPre53(OperationContext* opCtx) {
const NamespaceString collNss = [&]() {
if (serverGlobalParams.clusterRole == ClusterRole::ShardServer) {
return NamespaceString::kShardConfigCollectionsNamespace;
} else if (serverGlobalParams.clusterRole == ClusterRole::ConfigServer) {
return CollectionType::ConfigNS;
}
MONGO_UNREACHABLE;
}();
write_ops::UpdateCommandRequest updateOp(collNss);
updateOp.setUpdates({[&] {
write_ops::UpdateOpEntry entry;
BSONObjBuilder updateCmd;
BSONObjBuilder unsetBuilder(updateCmd.subobjStart("$unset"));
unsetBuilder.append(CollectionType::kMaxChunkSizeBytesFieldName, 0);
if (serverGlobalParams.clusterRole == ClusterRole::ConfigServer) {
unsetBuilder.append(CollectionType::kNoAutoSplitFieldName, 0);
} else {
unsetBuilder.append(ShardCollectionTypeBase::kAllowAutoSplitFieldName, 0);
}
unsetBuilder.doneFast();
entry.setQ({});
const BSONObj update = updateCmd.obj();
entry.setU(write_ops::UpdateModification::parseFromClassicUpdate(update));
entry.setUpsert(false);
entry.setMulti(true);
return entry;
}()});
DBDirectClient client(opCtx);
client.update(updateOp);
const WriteConcernOptions majorityWC{
WriteConcernOptions::kMajority, WriteConcernOptions::SyncMode::UNSET, Seconds(0)};
WriteConcernResult ignoreResult;
auto latestOpTime = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
uassertStatusOK(waitForWriteConcern(opCtx, latestOpTime, majorityWC, &ignoreResult));
}
} // namespace sharding_util
} // namespace mongo
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