[GSA-RG] Minutes GSA-RG Telecon Nov 17, 2006

[Thomas Röblitz]

Hi all,

  I've a few comments on the negotiation protocol.

> - Negotiation Protocol
>   o the protocol will support the gathering of time availability information
>     specific for a request.

There exist several approaches for this. For example, a mechanism developed within the Askalon system (paper at SC'06), work on placements of reservations (by Krzysztof Rzadca, me and other colleagues at ZIB; papers in CPE and @EuroPar-2006), and more (by Ramin?).


>   o two-phase commit, extended state-diagram for pre-reservation (to support e.g. co-allocation)
>   o problem: failure of brokers during comittment in pre-reservation
>     currently not further investigated,
>     for a later stage: "Paxos" seems like a suitable protocol to deal with reliable committments (see work by Jon MacLaren)

I don't think 2PC or Paxos is sufficient. Paxos might help you if a broker crashes, but not if one of the selected resources is not responding. What you need is a decision within a certain period of time? If you're interested in our (TU Berlin & ZIB) findings, we could discuss this (on 27th Nov.).

Cheers,

  Thomas

> Attached are some minutes from today's telecon.
> Can also be found here:
> http://forge.gridforum.org/sf/go/doc14029?nav=1
>
> Philipp, I do not know whether you also took notes.
> Feel free to update the minutes.
>
>
> Ramin
>
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