[Tilesathome] Dissappearing tiles.

[Brent Easton]

*********** REPLY SEPARATOR  ***********

On 5/11/2007 at 11:25 PM Dirk-Lüder Kreie  wrote:

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>spaetz schrieb:
>>>> They are not being thrown away, they will still be uploaded once they
>get
>>>> a slot in the upload queue.
>>> Sloppy language on my part, sorry.
>> 
>
>>> Technically you are correct, but in reality, what is happening is
>>> that 1 tile request is being processed in full by up to 6 different
>>> clients,
>> 
>> Yes, that could happen, but only something like 30 hours after the
>> first job has been handed out. These 30 hours would only apply if all
>> our job queues were empty (in which case some redundancy wouldn't
>> hurt). If queues are longer (as is the case now) a failed job will
>> effectively be requeued, so it will take much longer until a rerender
>> request is reissued. And if the upload happens while the rerender
>> request is still in the pending queue it will be deleted.
>> 
>> So yes, while some redundancy can occur, I think it is not as bad, as
>> a rerender request will sit and wait in our queue for quite some
>> time, giving the uploaded tile some more time.
>
>As far as I understand the upload will then remove the "redundant"
>request from the queue so it wouldn't get handed out a second time anyway?

It may already have been handed out again to more clients before the upload takes place

____________________________________________________________
Brent Easton                       
Analyst/Programmer                               
University of Western Sydney                                   
Email: b.easton at uws.edu.au