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[nspcc-dev#1483] metabase: Add VERSION.md
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
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| # Metabase versioning | ||
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| This file describes changes between the metabase versions. | ||
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| ## Version 0 | ||
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| - Container ID is encoded as base58 string | ||
| - Object ID is encoded as base58 string | ||
| - Address is encoded as container ID + "/" + object ID | ||
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| ### 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 | ||
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| ### 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 blobovniczas they are stored in | ||
| - Name: container ID + `_small` | ||
| - Key: object ID | ||
| - Value: blobovnicza ID | ||
| - Buckets for mapping parent object to the split info | ||
| - Name: container ID + `_root` | ||
| - Key: object ID | ||
| - Value: split info | ||
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| ### 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 | ||
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| ### 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 |