openstack team mailing list archive

[Doug Hellmann <doug.hellmann@xxxxxxxxxxxxx>]

On Tue, May 22, 2012 at 4:35 PM, James R Penick <penick@xxxxxxxxxxxxx>wrote:

> >>-> In addition to a signature, I think we would need a sequence number
> >>to be embedded by the agent for each message sent, so that loss of
> >>messages, or forgery of messages, can be detected by the collector and
> >>further audit process.
>
> >OK. We have a message id, but I assumed those would be used to eliminate
> >duplicates so this sounds like something different or new. It implies
> >that the agent knows its own id (not hard) and keeps up >with a sequence
> >counter (more difficult, though not impossible).
> >Did you have something in mind for how to implement that?
>
>
> If we're submitting messages every given node with a predictable
> frequency, we should be able to determine that a message was lost simply
> by noting a gap in the timestamps. Also, if we're sending cumulative
> statistics then the loss of a single message (or even a fair number of
> them) shouldn't impact our ability to meter too much.
>

I don't know if we have cumulative statistics. What does libvirt actually
give us?


>
> -James
>
>