Re: [Stellarium-pubdevel] Image serving

[Mike S. <oop...@gm...>]

On Sun, Jan 18, 2009 at 7:55 PM, Rob Spearman
<ro...@di...> wrote:
>
> Regarding DSS or other image hosting, I think it would be relatively
> easy to get this donated.  I don't think it's something we want to run
> if we can help it, better to spend our time/resources elsewhere.

Whom specifically should we ask? A server farm, a university, a
research organization? Google, Facebook (they mirror some open-source
projects), Microsoft, Novell? I'm just throwing out ideas.

Mike

> Is there a written license now?  That was the hang up last time I looked
> into this.  The host would want some kind of mention.
>
> Thanks,
>
> Rob
>
>
> On Sun, 2009-01-18 at 17:48 -0600, Mike Storm wrote:
>> > I thought of using a peer to peer system at first, but it seems that
>> > it's difficult to avoid huge latencies. In Stellarium, we need very
>> > low latency for getting a lot of small images as fast as possible.
>>
>> I was thinking only a few constantly-connected, high-speed clients
>> would be doing the sharing. For example, my friend down the hall has a
>> custom-built gaming box that's always connected to the university
>> network. He could even choose to run some sort of daemon, if he
>> doesn't want Stellarium open all the time. These clients would be
>> equivalent to supernodes in the Gnutella network, which I'm fairly
>> familiar with. (Nobody actually uses a pure peer-to-peer network
>> anymore, due to those latency problems you're worried about.)
>>
>> Perhaps a mixed system - when requesting an image tile, the leaf (end
>> user) 1) queries its own cache, 2) queries the supernodes, 3) queries
>> the master server. If in step 2 the supernodes don't ping back within,
>> say, 50ms, go to step 3 and ask the master server. I think that this
>> would eliminate our latency problems and substantially reduce load on
>> the master server. Even if none of the supernodes respond, nobody's
>> going to notice the 1/20th of a second it took to ask them. And
>> end-users will never need to know that this is going on, unless they
>> choose to be a supernode. Does this all make sense?
>>
>> I think I can prototype this. Thoughts?
>>
>> >
>> > But I am not an expert for these questions though, any thoughs
>> > welcome. In the mean time, we have enough money  from donations to set
>> > up at least 1 server for a couple of years.
>>
>> Wow! I didn't know that. By the way, what's the size of the entire DSS
>> catalog we're using? And do we have any estimate of the bandwidth that
>> it's going to take?
>>
>> Mike
>>
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