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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 <string>
#include <vector>
#include "mongo/bson/util/bson_extract.h"
#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/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/s/split_chunk.h"
#include "mongo/logv2/log.h"
#include "mongo/s/catalog/type_chunk.h"
#include "mongo/util/str.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
namespace {
class SplitChunkCommand : public ErrmsgCommandDeprecated {
public:
SplitChunkCommand() : ErrmsgCommandDeprecated("splitChunk", "_shardsvrSplitChunk") {}
std::string help() const override {
return "internal command usage only\n"
"example:\n"
" { splitChunk:\"db.foo\" , keyPattern: {a:1} , min : {a:100} , max: {a:200} { "
"splitKeys : [ {a:150} , ... ]}";
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
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::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 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(DatabaseNameUtil::deserialize(boost::none, dbname), cmdObj));
// Check whether parameters passed to splitChunk are sound
BSONObj keyPatternObj;
{
BSONElement keyPatternElem;
auto keyPatternStatus =
bsonExtractTypedField(cmdObj, "keyPattern", Object, &keyPatternElem);
if (!keyPatternStatus.isOK()) {
errmsg = "need to specify the key pattern the collection is sharded over";
return false;
}
keyPatternObj = keyPatternElem.Obj();
}
auto chunkRange = uassertStatusOK(ChunkRange::fromBSON(cmdObj));
std::string shardName;
auto parseShardNameStatus = bsonExtractStringField(cmdObj, "from", &shardName);
uassertStatusOK(parseShardNameStatus);
LOGV2(22104,
"Received splitChunk request: {request}",
"Received splitChunk request",
"request"_attr = redact(cmdObj));
std::vector<BSONObj> splitKeys;
{
BSONElement splitKeysElem;
auto splitKeysElemStatus =
bsonExtractTypedField(cmdObj, "splitKeys", mongo::Array, &splitKeysElem);
if (!splitKeysElemStatus.isOK()) {
errmsg = "need to provide the split points to chunk over";
return false;
}
BSONObjIterator it(splitKeysElem.Obj());
while (it.more()) {
splitKeys.push_back(it.next().Obj().getOwned());
}
}
OID expectedCollectionEpoch;
uassertStatusOK(bsonExtractOIDField(cmdObj, "epoch", &expectedCollectionEpoch));
boost::optional<Timestamp> expectedCollectionTimestamp;
if (cmdObj["timestamp"]) {
expectedCollectionTimestamp.emplace();
uassertStatusOK(bsonExtractTimestampField(
cmdObj, "timestamp", expectedCollectionTimestamp.get_ptr()));
}
// Check that the preconditions for split chunk are met and throw StaleShardVersion
// otherwise.
{
onCollectionPlacementVersionMismatch(opCtx, nss, boost::none);
OperationShardingState::
unsetShardRoleForLegacyDDLOperationsSentWithShardVersionIfNeeded(opCtx, nss);
const auto [metadata, indexInfo] = checkCollectionIdentity(
opCtx, nss, expectedCollectionEpoch, expectedCollectionTimestamp);
checkShardKeyPattern(opCtx, nss, metadata, indexInfo, chunkRange);
checkChunkMatchesRange(opCtx, nss, metadata, indexInfo, chunkRange);
}
auto topChunk = uassertStatusOK(splitChunk(opCtx,
nss,
keyPatternObj,
chunkRange,
std::move(splitKeys),
shardName,
expectedCollectionEpoch,
expectedCollectionTimestamp));
// Otherwise, we want to check whether or not top-chunk optimization should be performed. If
// yes, then we should have a ChunkRange that was returned. Regardless of whether it should
// be performed, we will return true.
if (topChunk) {
result.append("shouldMigrate",
BSON("min" << topChunk->getMin() << "max" << topChunk->getMax()));
}
return true;
}
} cmdSplitChunk;
} // namespace
} // namespace mongo
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