[DAS2] tiled queries for performance

[Lincoln Stein]

One thing to do is to add to the spec a note that the server is free to return 
features from a range larger than requested. This way the server is free to 
expand the range to the 1k boundaries.

My preference, however, would be for the server to implement a filter that 
removes from the precalculated tiled XML output all features that are outside 
the range. This would be completely transparent to the client.

Lincoln

On Friday 25 November 2005 06:43 pm, Andrew Dalke wrote:
> Asim Siddiqui
>
> > I think this is a great idea.
> >
> > I don't see this as a big change to the DAS/2 spec or requiring much in
> > the way of additional smarts on the client side.
>
> I agree with Allen on this - in some sense there's no effect on the
> spec.  It ends up being an agreement among the clients to request
> aligned data, by rounding up/down to the nearest, say, kilobase and
> for the server implementers to cache those requests.
>
> > The change is simply that instead of the client getting exactly what it
> > asks for, it may get more.
>
> While that's another matter - the client makes a request
> and the server is free to expand the range to something it can handle
> a bit better.  Allen?  Were you suggesting this instead?
>
> In this case there is a change to the spec, and all clients must
> be able to filter or otherwise ignore extra results.
>
> I personally think it's an implementation issue related to performance
> and there are ways to make the results be generated fast enough.
>
> 					Andrew
> 					dalke at dalkescientific.com
>
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-- 
Lincoln D. Stein
Cold Spring Harbor Laboratory
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