Feature #14199
Updated by Peter Amstutz over 5 years ago
Enable clients to reference blocks from remote clusters, and have those blocks automatically copied to the local cluster.
Design sketch:
* Feature to instruct keepstore to pull a block, save it, and return signed locator (variation on "proxy a block request")
* Controller instructs keepstore to pull each block with +R signature and rewrites the manifest with local signatures
* Because this could take a while, controller should return "202 Accepted" so the query doesn't time out
* Client needs be indicate it understands "202 Accepted" (probably a query parameter)
* If it is a POST request, how does the client know when the collection is ready? Do we create a new empty collection with a note "being populated", return the uuid, and then update it when the complete manifest is ready?
** If not, then it needs to return some other token that can be used to resolve the collection being downloaded by controller into the real collection when ready
** What happens if controller falls over while it is processing the collection?