frostfs-s3-gw/docs/tree_service.md
Angira Kekteeva 5c8a927c36 [#559] Add Tree service docs
Signed-off-by: Angira Kekteeva <kira@nspcc.ru>
2022-07-22 15:19:16 +03:00

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Tree service

To get objects' metadata and system information, the S3 GW makes requests to the Tree service. This is a service in NeoFS storage that keeps different information as a tree structure.

Each node keeps one of the types of data as a set of key-value pairs:

  • Bucket settings: lock configuration and versioning mode
  • Bucket tagging
  • Object tagging
  • Object metadata: OID, name, creation time, system metadata
  • Object locking settings
  • Active multipart upload info

Some data takes up a lot of memory, so we store it in NeoFS nodes as an object with payload. But we keep these objects' metadata in the Tree service too:

  • Notification configuration
  • CORS
  • Metadata of parts of active multipart uploads