findByRequestId

The stream committed for requestId by the aggregate ref, or by another aggregate of its type and tenant that an append of ref would meet, if any: facts only. This is the stream an append of the request to ref would find already committed. A log whose request key is narrower than the aggregate type, such as MongoDB's, unique within a partition, reads only what that append meets; by default the type's lookup. The kernel's dedup pre-check and its settling of a conflict call it.

The stream committed for requestId within tenantId in aggregate type type, if any: facts only. It reads that type's storage alone, every partition of it. Admission calls it for a creation command that names no aggregate; a caller that knows the aggregate calls the overload taking its AggregateRef.