SP client-side session storage and originating IdP

[Cantor, Scott]

> Thanks, Scott. And the only way to cluster the reverse mappings today is with
> something like a database or memcache, right? Which defeats the purpose of
> client-side storage.

Yes, it just reduces the impact of a storage failure to breaking logout, which is why the StorageServiceLite option is in there to divert that set of storage calls to a separate back-end.

-- Scott