huaxingao commented on code in PR #14196:
URL: https://github.com/apache/iceberg/pull/14196#discussion_r2393011182
##########
open-api/rest-catalog-open-api.yaml:
##########
@@ -1903,6 +1926,39 @@ components:
schema:
type: string
+ idempotency-key:
+ name: Idempotency-Key
+ in: header
+ required: false
+ schema:
+ type: string
+ format: uuid
+ minLength: 36
+ maxLength: 36
+ example: "550e8400-e29b-41d4-a716-446655440000"
+ description: |
+ Optional client-provided idempotency key for safe request retries.
+
+ When present, the server ensures no additional effects for requests
that carry the same
+ Idempotency-Key within the same operation/resource scope. If a prior
request with this key
+ has been finalized, the server returns the previously finalized
response instead of
+ re-executing the mutation.
+
+ Finalization rules:
+ - Finalize & replay: 200, 201, 204, and deterministic terminal 4xx
+ - Do not finalize (not stored/replayed): 5xx, 409 request_in_progress
+
+ Key Requirements:
+ - Must be unique per client mutation operation (e.g., updateTable,
createTable)
+ - Key format: UUID (V7 preferred)
+ - Scoped to operation type and resource path
Review Comment:
I’m open to switching to global uniqueness for Idempotency-Key if that’s the
preferred direction.
If we switch, I’ll update the spec to:
- state that keys MUST be globally unique (no reuse across different
operations), and
- recommend servers validate that replays with the same key have the same
method, path, and body (reject otherwise).
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