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Re: [pcp] pcp updates

To: kenj@xxxxxxxxxxxxxxxx
Subject: Re: [pcp] pcp updates
From: Nathan Scott <nathans@xxxxxxxxxx>
Date: Mon, 9 May 2011 15:34:26 +1000 (EST)
Cc: pcp@xxxxxxxxxxx
In-reply-to: <1304912814.2463.16.camel@xxxxxxxxxxxxxxxx>
----- Original Message -----
> Ouch. Sorry had not considered this. I'll undo those changes and leave
> the hinv metrics alone.
> 
> Special cases in QA is better than special cases in pmlogextract.
> 
> We probably need to think more carefully about how metadata changes
> could be made in general for established metrics ... at some point
> someone will want to promote a metric from 32-bit to 64-bit, or Bytes
> to
> Mbytes, or ... so the problem is a latent one that will come back at
> some point in the future.

*nod* ... its not a future problem, happens semi-regularly... someone
adds an application metric with incorrect metadata, someone else fixes
it ... next app upgrade, *boom*.  And if not picked up within the log
rotation/culling window, data is lost (a whole day).

I would love to see "harmless" metadata changes - like the 32/64 bit
upgrades, this count vs none, maybe one or two others? automatically
handled by logextract ... it goes beyond just this (good imo) change
you have here, to a more general issue.

cheers.

-- 
Nathan

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