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Type:
Task
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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Service Arch
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Fully Compatible
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Service Arch 2023-10-02, Service Arch 2023-10-16, Service Arch 2023-10-30, Service Arch 2023-11-13, Service Arch 2023-11-27, Service Arch 2023-12-11, Service Arch 2023-12-25, Service Arch 2024-01-08, Service Arch 2024-01-22, Service Arch 2024-02-05
There are several calls to BSONObj::getField that are made by functions called by ExecCommandDatabase::_initiateCommand and ExecCommandDatabase::run.
They come from the following places:
- Multiple calls to OpMsgRequest::getDbName
- _extractReadConcern
- commandSpecifiesWriteConcern
- searches for "shardVersion" and "databaseVersion"
- ReadPreferenceSetting::fromInnerBSON
- VectorClock::PlainComponentFormat::in and VectorClock::SignedComponentFormat::in
Additionally, there are two manual loops over BSONOjb fields:
- readRequestMetadata
- ExecCommandDatabase::_initiateCommand
Finally, we invoke 2 IDL parser in addition to the one for the command
- APIParametersFromClient
- OperationSessionInfoFromClient
Example of the request fields that can be consolidated in an IDL definition:
structs:
CommonRequestArgs:
description: TODO
strict: false
unsafe_dangerous_disable_extra_field_duplicate_checks: true
chained_structs:
APIParametersFromClient: APIParametersFromClient
OperationSessionInfoFromClientBase: OperationSessionInfoFromClientBase
ClusterTimesCommon: ClusterTimesCommon
fields:
readConcern:
type: object
optional: true
databaseVersion:
type: database_version
optional: true
shardVersion:
type: shard_version
optional: true
writeConcern:
type: IDLAnyType
optional: true
$readPreference:
type: IDLAnyType
cpp_name: readPreference
optional: true
$client:
type: IDLAnyType
cpp_name: clientMetadata
optional: true
tracking_info:
type: IDLAnyType
optional: true
$audit:
cpp_name: impersonation
type: IDLAnyType
optional: true
clientOperationKey:
type: uuid
optional: true
mayBypassWriteBlocking:
type: IDLAnyType
optional: true
maxTimeMS:
type: maxTimeMS
optional: true
validator: { gte: 0 }
maxTimeMSOpOnly:
type: maxTimeMS
optional: true
validator: { gte: 0 }
help:
type: safeBool
optional: true
comment:
type: IDLAnyType
optional: true
$maxTimeMS:
type: IDLAnyType
cpp_name: queryOptionMaxTimeMS
optional: true
Note: There may be opportunity to align with the request fields defined in src/mongo/idl/generic_argument.idl. On the other hand, a more narrow parser for this error handling will be better then a wider parser handling all generic request fields.
POC: https://github.com/markbenvenuto/mongo/tree/tiger_perf_bson
- related to
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- Closed
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SERVER-85791 Only parse command request once in command processing path
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- In Progress
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