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

[Philipp Wieder]

Dear Thomas,

thank you for your comments.

Just to make it clear: What we are discussing at the moment targets
interoperability of schedulers. We would like to start with a simple
example and actually implement the necessary things for different
schedulers. This implies that certain requirements, like for example the
one regarding a sophisticated negotiation protocol, are not our primary
focus or are postponed to be discussed later.

Nevertheless I would be interested in discussing your views and
experiences, which we definitely can do in Siphia Antipolis.

Best regards, Philipp.



Thomas Röblitz wrote:
> 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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