From 633b4e7d2dbb0f895c0c193a0d76ffc670e06f0b Mon Sep 17 00:00:00 2001 From: Evgenii Stratonikov Date: Thu, 16 Jun 2022 17:10:14 +0300 Subject: [PATCH] [#1483] metabase: Add VERSION.md Signed-off-by: Evgenii Stratonikov --- pkg/local_object_storage/metabase/VERSION.md | 87 ++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 pkg/local_object_storage/metabase/VERSION.md diff --git a/pkg/local_object_storage/metabase/VERSION.md b/pkg/local_object_storage/metabase/VERSION.md new file mode 100644 index 000000000..d66c0a628 --- /dev/null +++ b/pkg/local_object_storage/metabase/VERSION.md @@ -0,0 +1,87 @@ +# Metabase versioning + +This file describes changes between the metabase versions. + +## Version 0 + +- Container ID is encoded as base58 string +- Object ID is encoded as base58 string +- Address is encoded as container ID + "/" + object ID + +### 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 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 + +### 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