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Re: [Rtg-yang-coord] Clearing all stats in a container

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Thu, 05 March 2015 07:45 UTC

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Date: Thu, 5 Mar 2015 08:45:29 +0100
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Mahesh Jethanandani <mjethanandani@gmail.com>
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Subject: Re: [Rtg-yang-coord] Clearing all stats in a container
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On Wed, Mar 04, 2015 at 10:30:37PM -0800, Mahesh Jethanandani wrote:
> Assuming one has defined stat counters in one container, like ietf-interfaces has done with its statistics, does anyone have suggestions on how one can essentially clear (reset to 0) all the counters in that container.
>

Resetting counters is a bad idea. Once you have more than one
application trying to reset counters you get into trouble. Note
this RFC 6991 (lifted from RFC 2578):

       Counters have no defined 'initial' value, and thus, a
       single value of a counter has (in general) no information
       content.

Applications have to read a counter C at time t0 and then again at
time t1 and then calculate the difference C(t1) - C(t0). This allows
applications to obtain statistics at different time granularities
without stepping on each other.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>

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