[AFS3-std] Standardization of GetCapabilties RPCs for AFS3 client and services

[Chaskiel M Grundman]

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--On Friday, February 24, 2006 18:16:39 -0500 Jeffrey Altman=20
<jaltman@secure-endpoints.com> wrote:

>
> (4) Instead of extending functionality by issuing a new RPC and then
>     supporting both the old and new forms, RPCs should be extended by
>     adding the new functions to the existing RPC and specifying a
>     Capability flag.
The usual reason to add a new RPC is because the arguments or argument=20
types differ, not just the semantics. given the current rxgen-generated=20
stubs, an rx client or server cannot provide different wire encodings to=20
different peers based on capabilities. FetchStatus has not had to evolve=20
(yet) as the changes made to it have not resulted in an on-wire change,=20
only a change in semantics of previously reserved fields.

> (5) In addition to advertising new functionality, the Capabilities flags
>     can be used to provide hints to the caller of behavior the server
>     may desire.  For example, a file server may prefer that client not
>     request make SetLock requests even though the functionality is
>     supported.  These hints would not be mandatory and would simply be
>     a method by which desired policy can be distributed from server to
>     client.

Why is it a good idea to put client policy configuration in the server?


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