frostfs-node/pkg/local_object_storage/metabase/VERSION.md

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# Metabase versioning
This file describes changes between the metabase versions.
## Current
### Primary buckets
- Graveyard bucket
- Name: `_Graveyard`
- Key: object address
- Value: tombstone address
- Garbage bucket
- Name: `_Garbage`
- Key: object address
- Value: dummy value
- Bucket containing IDs of objects that are candidates for moving
to another shard.
- Name: `_ToMoveIt`
- Key: object address
- Value: dummy value
- Container volume bucket
- Name: `_ContainerSize`
- Key: container ID
- Value: container size in bytes as little-endian uint64
- Bucket for storing locked objects information
- Name: `_Locked`
- Key: container ID
- Value: bucket mapping objects locked to the list of corresponding LOCK objects
- Bucket containing auxilliary information. All keys are custom and are not connected to the container
- Name: `_i`
- Keys and values
- `id` -> shard id as bytes
- `version` -> metabase version as little-endian uint64
### Unique index buckets
- Buckets containing objects of REGULAR type
- Name: container ID
- Key: object ID
- Value: marshalled object
- Buckets containing objects of LOCK type
- Name: container ID + `_LOCKER`
- Key: object ID
- Value: marshalled object
- Buckets containing objects of STORAGEGROUP type
- Name: container ID + `_SG`
- Key: object ID
- Value: marshaled object
- Buckets containing objects of TOMBSTONE type
- Name: container ID + `_TS`
- Key: object ID
- Value: marshaled object
- Buckets mapping objects to the storage ID they are stored in
- Name: container ID + `_small`
- Key: object ID
- Value: storage ID
- Buckets for mapping parent object to the split info
- Name: container ID + `_root`
- Key: object ID
- Value: split info
### FKBT index buckets
- Buckets mapping owner to object IDs
- Name: containerID + `_ownerid`
- Key: owner ID as base58 string
- Value: bucket containing object IDs as keys
- Buckets containing objects attributes indexes
- Name: containerID + `_attr_` + attribute key
- Key: attribute value
- Value: bucket containing object IDs as keys
### List index buckets
- Buckets mapping payload hash to a list of object IDs
- Name: container ID + `_payloadhash`
- Key: payload hash
- Value: list of object IDs
- Buckets mapping parent ID to a list of children IDs
- Name: container ID + `_parent`
- Key: parent ID
- Value: list of children object IDs
- Buckets mapping split ID to a list of object IDs
- Name: container ID + `_splitid`
- Key: split ID
- Value: list of object IDs
# History
## Version 1
- Metabase now stores generic storage id instead of blobovnicza ID.
## Version 0
- Container ID is encoded as base58 string
- Object ID is encoded as base58 string
- Address is encoded as container ID + "/" + object ID