2022-06-28 07:05:51 +00:00
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# Tree service
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2023-03-24 12:49:23 +00:00
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To get objects' metadata and system information, the S3 GW makes requests to the Tree service.
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This is a service in FrostFS storage that keeps different information as a tree structure.
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2022-06-28 07:05:51 +00:00
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Each node keeps one of the types of data as a set of **key-value pairs**:
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2023-03-24 12:49:23 +00:00
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* Bucket settings: lock configuration and versioning mode
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2022-06-28 07:05:51 +00:00
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* Bucket tagging
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* Object tagging
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* Object metadata: OID, name, creation time, system metadata
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* Object locking settings
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* Active multipart upload info
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2023-03-24 12:49:23 +00:00
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Some data takes up a lot of memory, so we store it in FrostFS nodes as an object with payload.
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2022-06-28 07:05:51 +00:00
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But we keep these objects' metadata in the Tree service too:
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* CORS
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* Metadata of parts of active multipart uploads
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