frostfs-api/proto-docs/storagegroup.md

Protocol Documentation

Table of Contents

• storagegroup/types.proto

  • Messages
    • StorageGroup

• Scalar Value Types

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storagegroup/types.proto

Message StorageGroup

StorageGroup keeps verification information for Data Audit sessions. Objects that require paid storage guarantees are gathered in StorageGroups with additional information used for the proof of storage. StorageGroup only contains objects from the same container.

Being an object payload, StorageGroup may have expiration Epoch set with __SYSTEM__EXPIRATION_EPOCH (__NEOFS__EXPIRATION_EPOCH is deprecated) well-known attribute. When expired, StorageGroup will be ignored by InnerRing nodes during Data Audit cycles and will be deleted by Storage Nodes.

Field	Type	Label	Description
validation_data_size	uint64		Total size of the payloads of objects in the storage group
validation_hash	neo.fs.v2.refs.Checksum		Homomorphic hash from the concatenation of the payloads of the storage group members. The order of concatenation is the same as the order of the members in the members field.
expiration_epoch	uint64		DEPRECATED. Last NeoFS epoch number of the storage group lifetime
members	neo.fs.v2.refs.ObjectID	repeated	Strictly ordered list of storage group member objects. Members MUST be unique

Scalar Value Types

.proto Type	Notes	C++ Type	Java Type	Python Type
double		double	double	float
float		float	float	float
int32	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.	int32	int	int
int64	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.	int64	long	int/long
uint32	Uses variable-length encoding.	uint32	int	int/long
uint64	Uses variable-length encoding.	uint64	long	int/long
sint32	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.	int32	int	int
sint64	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.	int64	long	int/long
fixed32	Always four bytes. More efficient than uint32 if values are often greater than 2^28.	uint32	int	int
fixed64	Always eight bytes. More efficient than uint64 if values are often greater than 2^56.	uint64	long	int/long
sfixed32	Always four bytes.	int32	int	int
sfixed64	Always eight bytes.	int64	long	int/long
bool		bool	boolean	boolean
string	A string must always contain UTF-8 encoded or 7-bit ASCII text.	string	String	str/unicode
bytes	May contain any arbitrary sequence of bytes.	string	ByteString	str