Re: User-serviceable snapshots design

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> Attached is a basic write-up of the user-serviceable snapshot feature
> design (Avati's). Please take a look and let us know if you have
> questions of any sort...

A few.

The design creates a new type of daemon: snapview-server.

* Where is it started?  One server (selected how) or all?

* How do clients find it?  Are we dynamically changing the client
  side graph to add new protocol/client instances pointing to new
  snapview-servers, or is snapview-client using RPC directly?  Are
  the snapview-server ports managed through the glusterd portmapper
  interface, or patched in some other way?

* Since a snap volume will refer to multiple bricks, we'll need
  more brick daemons as well.  How are *those* managed?

* How does snapview-server manage user credentials for connecting
  to snap bricks?  What if multiple users try to use the same
  snapshot at the same time?  How does any of this interact with
  on-wire or on-disk encryption?

I'm sure I'll come up with more later.  Also, next time it might
be nice to use the upstream feature proposal template *as it was
designed* to make sure that questions like these get addressed
where the whole community can participate in a timely fashion.
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