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From andrzej <awankow...@gmail.com>
Subject Re: [users@httpd] lbmethods in mod_proxy_balancer
Date Fri, 30 May 2008 13:20:13 GMT
Jim Jagielski pisze:
> 
> On May 29, 2008, at 5:38 PM, andrzej wrote:
> 
>> Hi,
>>
>> module mod_proxy_balancer can make decision basing on volume of 
>> traffic or number of requests. How, for example, this volume is 
>> counted? Is it counted from the time server starts (hope not) or maybe 
>> it is counted in 10 minutes period (after 10 minutes values read and 
>> transfered are reset  and counted from zero)? Where/how can I change 
>> this time?
>>
> 
> It is counted after each request... that each, the counters are
> updated with info after each request.
> 
> They are not "reset" or "aged" for a number of reasons:
> 
>   1. The overhead associated with it. Esp something like what
>      is done in mod_jk...
>   2. Validity: LBs try to maintain an overall average. If
>      you occasionally "reset" then you lose knowledge of
>      the past and so you are only averaging over smaller
>      time-periods... It's like the difference in tracking
>      stocks short-term rather than long-term. LB is a long
>      term action.
> 
> The only reason I can see for some kind of "reset" is to
> avoid overflow, but even then you don't want to "reset" to
> 0 but rather do a uniform normalization.
> 
> Why is the current behavior bad and why do you want to change
> it?
> 
> 
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> 

Hi,

thanks for answer. This behavior isn't bad. I'm writing my MSc project 
and when I've told my DSc that this counters are not reseting he ordered 
me to better known the software. I don't know how I convince him, he was 
so sure that this values are measured in periods...

Regards
Andrew

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