I have also asked this question in stackoverflow. 

http://stackoverflow.com/questions/30808294/middleware-to-limit-the-amount-of-requests-downloaded-by-scrapy

On Friday, June 12, 2015 at 6:42:49 PM UTC+2, Leonardo Casanova wrote:
>
> Hi,
>
> As the title says my problem is that I need to limit the amount of parse 
> callbacks being processed concurrently as the are quite memory intensive 
> (some of them create a selenium instance). 
> To avoid this I want to prevent scrapy from downloading new requests while 
> parse callbacks are still being processed.
>
> I have written this middleware to reschedule requests if they exceed a 
> certain limit. 
> However at some point the scraping seems to stop and no new requests are 
> made. 
> Can you help me check if I missed something?
>
> Best Regards
> Leo
>

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