On Mon, May 23, 2016 at 1:42 PM, Jonathan Moules <
jonathan-li...@lightpear.com> wrote:
> Hi Andrea,
>
> Just a thought, but what about implementing a timeout on the pool tokens,
> and/or allowing one to be configured?
>
> That way if one request in a while goes astray, after n-seconds
> control-flow will assume things broke and the token will be returned to the
> pool. That way you don't end up with a situation of the pool getting slowly
> smaller over time as the odd erroneous-in-a-certain-way query makes tokens
> disappears gradually.
>
Yes, this idea has been discussed but I'm fiercely resisting it for a
couple of reasons:
- It is not entirely trivial to implement
- It makes control-flow completely useless under heavy load, when all
the requests end up taking a lot of time, and by allowing more to get it
due to the timeout, which in the end make things works as requests will
take even longer, allowing more tokens to reach the timeout and thus allow
even more requests in.
Long story short, imho, if I cannot trust control-flow to limit concurrent
access under heavy load, it's useless and it's better to run without. I
want to fix it instead of allowing it to degrade into no-control
Cheers
Andrea
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