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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 "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/catalog_raii.h"
#include "mongo/db/commands.h"
#include "mongo/db/field_parser.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/s/active_migrations_registry.h"
#include "mongo/db/s/chunk_operation_precondition_checks.h"
#include "mongo/db/s/collection_sharding_runtime.h"
#include "mongo/db/s/operation_sharding_state.h"
#include "mongo/db/s/shard_filtering_metadata_refresh.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/vector_clock.h"
#include "mongo/logv2/log.h"
#include "mongo/s/catalog/type_chunk.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/request_types/merge_chunk_request_gen.h"
#include "mongo/util/str.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
namespace {
Shard::CommandResponse commitMergeOnConfigServer(OperationContext* opCtx,
const NamespaceString& nss,
const OID& epoch,
const boost::optional<Timestamp>& timestamp,
const ChunkRange& chunkRange,
const CollectionMetadata& metadata) {
auto const shardingState = ShardingState::get(opCtx);
ConfigSvrMergeChunks request{nss, shardingState->shardId(), metadata.getUUID(), chunkRange};
request.setEpoch(epoch);
request.setTimestamp(timestamp);
auto cmdResponse =
uassertStatusOK(Grid::get(opCtx)->shardRegistry()->getConfigShard()->runCommand(
opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
DatabaseName::kAdmin.toString(),
request.toBSON(BSON(WriteConcernOptions::kWriteConcernField
<< ShardingCatalogClient::kMajorityWriteConcern.toBSON())),
Shard::RetryPolicy::kIdempotent));
return cmdResponse;
}
void mergeChunks(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& minKey,
const BSONObj& maxKey,
const OID& expectedEpoch,
const boost::optional<Timestamp>& expectedTimestamp) {
auto scopedSplitOrMergeChunk(
uassertStatusOK(ActiveMigrationsRegistry::get(opCtx).registerSplitOrMergeChunk(
opCtx, nss, ChunkRange(minKey, maxKey))));
ChunkRange chunkRange(minKey, maxKey);
// Check that the preconditions for merge chunks are met and throw StaleShardVersion otherwise.
const auto metadataBeforeMerge = [&]() {
onCollectionPlacementVersionMismatch(opCtx, nss, boost::none);
OperationShardingState::unsetShardRoleForLegacyDDLOperationsSentWithShardVersionIfNeeded(
opCtx, nss);
const auto [metadata, indexInfo] =
checkCollectionIdentity(opCtx, nss, expectedEpoch, expectedTimestamp);
checkShardKeyPattern(opCtx, nss, metadata, indexInfo, chunkRange);
checkRangeOwnership(opCtx, nss, metadata, indexInfo, chunkRange);
return metadata;
}();
auto cmdResponse = commitMergeOnConfigServer(
opCtx, nss, expectedEpoch, expectedTimestamp, chunkRange, metadataBeforeMerge);
auto chunkVersionReceived = [&]() -> boost::optional<ChunkVersion> {
// Old versions might not have the shardVersion field
if (cmdResponse.response[ChunkVersion::kChunkVersionField]) {
return ChunkVersion::parse(cmdResponse.response[ChunkVersion::kChunkVersionField]);
}
return boost::none;
}();
onCollectionPlacementVersionMismatch(opCtx, nss, std::move(chunkVersionReceived));
uassertStatusOKWithContext(cmdResponse.commandStatus, "Failed to commit chunk merge");
uassertStatusOKWithContext(cmdResponse.writeConcernStatus, "Failed to commit chunk merge");
}
class MergeChunksCommand : public ErrmsgCommandDeprecated {
public:
MergeChunksCommand() : ErrmsgCommandDeprecated("mergeChunks", "_shardsvrMergeChunks") {}
std::string help() const override {
return "Internal command to merge a contiguous range of chunks.\n"
"Usage: { mergeChunks: <ns>, epoch: <epoch>, bounds: [<min key>, <max key>] }";
}
Status checkAuthForOperation(OperationContext* opCtx,
const DatabaseName&,
const BSONObj&) const override {
if (!AuthorizationSession::get(opCtx->getClient())
->isAuthorizedForActionsOnResource(ResourcePattern::forClusterResource(),
ActionType::internal)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
NamespaceString parseNs(const DatabaseName& dbName, const BSONObj& cmdObj) const override {
return NamespaceStringUtil::parseNamespaceFromRequest(
dbName.tenantId(), CommandHelpers::parseNsFullyQualified(cmdObj));
}
bool adminOnly() const override {
return true;
}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kNever;
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
static BSONField<std::string> nsField;
static BSONField<std::vector<BSONObj>> boundsField;
static BSONField<OID> epochField;
static BSONField<Timestamp> timestampField;
bool errmsgRun(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj,
std::string& errmsg,
BSONObjBuilder& result) override {
uassertStatusOK(ShardingState::get(opCtx)->canAcceptShardedCommands());
const NamespaceString nss(parseNs({boost::none, dbname}, cmdObj));
std::vector<BSONObj> bounds;
if (!FieldParser::extract(cmdObj, boundsField, &bounds, &errmsg)) {
return false;
}
if (bounds.size() == 0) {
errmsg = "no bounds were specified";
return false;
}
if (bounds.size() != 2) {
errmsg = "only a min and max bound may be specified";
return false;
}
BSONObj minKey = bounds[0];
BSONObj maxKey = bounds[1];
if (minKey.isEmpty()) {
errmsg = "no min key specified";
return false;
}
if (maxKey.isEmpty()) {
errmsg = "no max key specified";
return false;
}
OID epoch;
if (!FieldParser::extract(cmdObj, epochField, &epoch, &errmsg)) {
return false;
}
boost::optional<Timestamp> timestamp;
if (cmdObj[timestampField()]) {
timestamp.emplace();
if (!FieldParser::extract(cmdObj, timestampField, timestamp.get_ptr(), &errmsg)) {
return false;
}
}
mergeChunks(opCtx, nss, minKey, maxKey, epoch, timestamp);
return true;
}
} mergeChunksCmd;
BSONField<std::string> MergeChunksCommand::nsField("mergeChunks");
BSONField<std::vector<BSONObj>> MergeChunksCommand::boundsField("bounds");
BSONField<OID> MergeChunksCommand::epochField("epoch");
BSONField<Timestamp> MergeChunksCommand::timestampField("timestamp");
} // namespace
} // namespace mongo
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