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[Bug 1345821] pmlogger records unrequested instances

To: pcp@xxxxxxxxxxx
Subject: [Bug 1345821] pmlogger records unrequested instances
From: bugzilla@xxxxxxxxxx
Date: Wed, 28 Sep 2016 13:20:30 +0000
Auto-submitted: auto-generated
Delivered-to: pcp@xxxxxxxxxxx
In-reply-to: <bug-1345821-355098@xxxxxxxxxxxxxxxxxxx>
References: <bug-1345821-355098@xxxxxxxxxxxxxxxxxxx>
https://bugzilla.redhat.com/show_bug.cgi?id=1345821



--- Comment #3 from Frank Ch. Eigler <fche@xxxxxxxxxx> ---
(In reply to Ken McDonell from comment #1)

> The instance domain records the fact that there are other instances that
> were available, but not requested in the pmlogger configuration.

But this fact was not requested by the client/user, and represents only
wasted disk space.  Luckily, the indom is only dumped once in this case.


> Trimming the instance domain in the archive to match only the instances in
> the archive (not the instances that are available) might be possible, but
> this changes the semantics

It would change behaviour, but I've never seen any documentation that would
lead people to believe that pmlogger does this, nor that archive files are
supposed to represent the complete theoretical indom even when pmResult 
records only refer to one of them, nor any code with this presumption.
If so, I'd call this more of an implementation accident (bug) than a feature
worth preserving.

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