Re: MDS unmatched rstat after upgrade hammer

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I fully understand, why it is just a comment :)

Can't wait for scrub.

Thanks!

On Thu, Apr 9, 2015 at 10:13 AM John Spray <john.spray@xxxxxxxxxx> wrote:


On 09/04/2015 17:09, Scottix wrote:
> Alright sounds good.
>
> Only one comment then:
> From an IT/ops perspective all I see is ERR and that raises red flags.
> So the exposure of the message might need some tweaking. In production
> I like to be notified of an issue but have reassurance it was fixed
> within the system.

Fair point.  Unfortunately, in general we can't distinguish between
inconsistencies we're fixing up due to a known software bug, and
inconsistencies that we're encountering for unknown reasons.  The reason
this is an error rather than a warning is that we handle this case by
arbitrarily trusting one statistic when it disagrees with another, so we
don't *know* that we've correctly repaired, we just hope.

Anyway: the solution is the forthcoming scrub functionality, which will
be able to unambiguously repair things like this, and give you a clearer
statement about what happened.

Cheers,
John
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