[bind10-dev] 转发: Should zonemgr refresh expired zones(Re: zonemgr / notify out questions)

[Stephen Morris]

On 14 Sep 2010, at 05:10, Jerry wrote:
> 
>> 19) Is random Refresh jitter defined in any specification? I see it
>> uses between (zone_refresh_time - ((1 * zone_refresh_time) / 4)) and
>> zone_refresh_time.
> I defined the refresh jitter value according to BIND9, which is suggested by
> jinmei. Maybe we can improve it.

I see there as being two alternatives.  If "r" is the refresh time and "j" the jitter value we could set it that the zone refreshes:

a) any time between r - j and r

or

b) any time between r - j and r + j

My own thought is that the latter is the most natural definition, as the term jitter tends to imply a deviation about a mean. 


Stephen