106 lines
3.2 KiB
Markdown
106 lines
3.2 KiB
Markdown
# Metabase versioning
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This file describes changes between the metabase versions.
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## Current
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### Primary buckets
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- Graveyard bucket
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- Name: `_Graveyard`
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- Key: object address
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- Value: tombstone address
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- Garbage bucket
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- Name: `_Garbage`
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- Key: object address
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- Value: dummy value
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- Bucket containing IDs of objects that are candidates for moving
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to another shard.
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- Name: `_ToMoveIt`
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- Key: object address
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- Value: dummy value
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- Container volume bucket
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- Name: `_ContainerSize`
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- Key: container ID
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- Value: container size in bytes as little-endian uint64
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- Bucket for storing locked objects information
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- Name: `_Locked`
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- Key: container ID
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- Value: bucket mapping objects locked to the list of corresponding LOCK objects
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- Bucket containing auxilliary information. All keys are custom and are not connected to the container
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- Name: `_i`
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- Keys and values
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- `id` -> shard id as bytes
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- `version` -> metabase version as little-endian uint64
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- `phy_counter` -> shard's physical object counter as little-endian uint64
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- `logic_counter` -> shard's logical object counter as little-endian uint64
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### Unique index buckets
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- Buckets containing objects of REGULAR type
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- Name: container ID
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- Key: object ID
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- Value: marshalled object
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- Buckets containing objects of LOCK type
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- Name: container ID + `_LOCKER`
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- Key: object ID
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- Value: marshalled object
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- Buckets containing objects of STORAGEGROUP type
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- Name: container ID + `_SG`
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- Key: object ID
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- Value: marshaled object
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- Buckets containing objects of TOMBSTONE type
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- Name: container ID + `_TS`
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- Key: object ID
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- Value: marshaled object
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- Buckets mapping objects to the storage ID they are stored in
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- Name: container ID + `_small`
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- Key: object ID
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- Value: storage ID
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- Buckets for mapping parent object to the split info
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- Name: container ID + `_root`
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- Key: object ID
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- Value: split info
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### FKBT index buckets
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- Buckets mapping owner to object IDs
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- Name: containerID + `_ownerid`
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- Key: owner ID as base58 string
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- Value: bucket containing object IDs as keys
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- Buckets containing objects attributes indexes
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- Name: containerID + `_attr_` + attribute key
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- Key: attribute value
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- Value: bucket containing object IDs as keys
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### List index buckets
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- Buckets mapping payload hash to a list of object IDs
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- Name: container ID + `_payloadhash`
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- Key: payload hash
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- Value: list of object IDs
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- Buckets mapping parent ID to a list of children IDs
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- Name: container ID + `_parent`
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- Key: parent ID
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- Value: list of children object IDs
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- Buckets mapping split ID to a list of object IDs
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- Name: container ID + `_splitid`
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- Key: split ID
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- Value: list of object IDs
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# History
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## Version 2
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- Container ID is encoded as 32-byte slice
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- Object ID is encoded as 32-byte slice
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- Object ID is encoded as 64-byte slice, container ID + object ID
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- Bucket naming scheme is changed:
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- container ID + suffix -> 1-byte prefix + container ID
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## Version 1
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- Metabase now stores generic storage id instead of blobovnicza ID.
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## Version 0
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- Container ID is encoded as base58 string
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- Object ID is encoded as base58 string
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- Address is encoded as container ID + "/" + object ID
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