MESSAGE quota resource implemention

[Greg Banks]

On 02/09/11 20:03, Bron Gondwana wrote:
> On Fri, Sep 02, 2011 at 07:36:20PM +1000, Greg Banks wrote:
> 
>> How's about this for a strategy?
>>
>> When a quota resource is first enabled, (i.e. the limit is changed from
>> UNLIMITED to some finite value), the usage is stored as some special
>> value which I'll call INDETERMINATE.
> 
> What about 'getquota'?  I don't support any solution which leaves getquota
> returning bogus values or failing to respond.  That's just icky and
> confusing.
> 
> I don't think you can avoid two passes, and I don't even think you can
> avoid two values during if you really want to be good about it.
> 
> [...]
> 
> There are pure ways to do this, that guarantee consistency. [...]
> 
> That's a real, robust solution.  But it's pretty heavy engineering.

After some thought, I agreed, decided it's quite doable, and decided to
start. I have an implementation coded, so far the hardest bit is testing it.



-- 
Greg.