Re: [Dime] [dime] #46: Bad normative advice on not letting overload reports expire

[<[e-mail]>]

+1

-----Message d'origine-----
De : DiME [mailto:[e-mail]] De la part de Jouni Korhonen
Envoyé : mardi 25 mars 2014 14:49
À : Steve Donovan
Cc : [e-mail]
Objet : Re: [Dime] [dime] #46: Bad normative advice on not letting overload reports expire


Fine with me.

On Mar 24, 2014, at 10:38 PM, Steve Donovan <[e-mail]> wrote:

> Here's some proposed wording that will hopefully let us close this issue:
> 
> Regards,
> 
> Steve
> 
> -----
> 
> Section 4.5., paragraph 3 - 
> 
> Current -02 wording:
> 
> As a general guidance for implementations it is RECOMMENDED never to
>    let any overload report to timeout.  Following to this rule, an
>    overload endpoint should explicitly signal the end of overload
>    condition and not rely on the expiration of the validity time of the
>    overload report in the reacting node.  This is achieved by sending an
>    updated overload report (meaning it must contain a new sequence
>    number) with the OC-Validity-Duration AVP value set to zero ("0").
> 
> Proposed wording:
> 
>    A reporting node SHOULD explicitly signal the end of overload
>    condition in a timely manner.  This is achieved by sending an
>    updated overload report (meaning the OLR contains a new sequence
>    number) with the OC-Validity-Duration AVP value set to zero ("0").
> 
>   A reacting node MUST invalidate and remove an overload report that
>   expires without an explicit overload report containing an OC-Validity-Duration
>   value set to zero ("0").
> 
> 
> On 2/11/14 4:31 PM, Jouni Korhonen wrote:
>> Fine with me.
>> 
>> - Jouni
>> 
>> On Feb 11, 2014, at 12:24 PM, Maria Cruz Bartolome 
>> <[e-mail]>
>>  wrote:
>> 
>> 
>>> Ben, Nirav,
>>> 
>>> I follow same argumentation.
>>> Regards
>>> /MCruz
>>> 
>>> -----Original Message-----
>>> From: DiME [
>>> mailto:[e-mail]
>>> ] On Behalf Of Nirav Salot (nsalot)
>>> Sent: martes, 11 de febrero de 2014 11:23
>>> To: Ben Campbell; Jouni Korhonen
>>> Cc: 
>>> [e-mail] list; [e-mail]
>>> 
>>> Subject: Re: [Dime] [dime] #46: Bad normative advice on not letting overload reports expire
>>> 
>>> Ben,
>>> 
>>> I resonate with your thinking below.
>>> 
>>> Regards,
>>> Nirav.
>>> 
>>> -----Original Message-----
>>> From: DiME [
>>> mailto:[e-mail]
>>> ] On Behalf Of Ben Campbell
>>> Sent: Monday, February 10, 2014 9:54 PM
>>> To: Jouni Korhonen
>>> Cc: 
>>> [e-mail] list; [e-mail]
>>> 
>>> Subject: Re: [Dime] [dime] #46: Bad normative advice on not letting overload reports expire
>>> 
>>> 
>>> On Feb 10, 2014, at 5:16 AM, Jouni Korhonen 
>>> <[e-mail]>
>>>  wrote:
>>> 
>>> 
>>>> My reasoning for explicit termination was that knowing the 
>>>> implementation folks they will let overload conditions expire unless advised otherwise.
>>>> And having unnecessary stuff hanging around waiting for a cleanup is 
>>>> not a good thing in general. But I am open here for other options..
>>>> 
>>>> 
>>> I think it's reasonable to say that a reporting node should terminate an overload condition in a timely manner. But if it's about to expire anyway, then expiration might be just as timely as an explicit report. 
>>> 
>>> And of course, the definition of "timely" is somewhat a matter of policy. For example, I can imagine an deployment that had a large number of clients using fairly short validity durations, and _never_ explicitly signaling an end to an overload condition. This adds a bit of a "slow-start" to the recovery, since different clients will expire the overload condition at different times, and the load will ramp up gradually. I don't see anything wrong with that. Of course, it wouldn't work if one chose long validity durations, or if the signaling of overload to different clients happened in close synchronization.
>>> 
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> 
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