Red Hat Bugzilla – Bug 471507
Grid - Default Scheduler statistics update timing
Last modified: 2015-11-15 19:06:05 EST
Description of problem:
Can we examine the timing on the Scheduler statistics page? This page is really important but seems to have a default of 5 minutes. That seems a bit long, no?
Version-Release number of selected component (if applicable):
Steps to Reproduce:
The Scheduler publishes every 5 minutes by default. That does not mean that the graph should only be updated every 5 minute. Watching the line move to the left is disconcerting.
This may be a duplicate of BZ470614
I think the chart is just being honest and forthright. What I think may address this is to make the default timespan for scheduler stats not 10 mins but an hour.
I made just such a change at revision 2944.
Mathew Farellee wrote:
> Watching the line move to the left is disconcerting.
This was not addressed yet - the graph still moves while having
no data, so the line moves to left leaving a blank space meanwhile
there is no update (best visible at '10 minutes' resolution).
See the attachments...
Created attachment 327219 [details]
Created attachment 327220 [details]
This bug has a lot to do with 470286, so I recommend pushing it for 1.1.1.
I've talked this over with a few people, and I am emboldened my original conclusion. Drawing the data points you have, and only those, is correct. It shouldn't be disconcerting that the chart moves to the left: it's displaying all that data it has since the present moment.
The two ways to hide the gap that naturally shows up are both unattractive options:
1. Add a made-up value, same as the most recent value we have, at zero time. This creates little disappearing data "plateaus".
2. Don't update the chart until we get a new sample. This has the problem of making the time axis a lie, since zero time is no longer approximately now.
Given these options, I prefer things as they are, and I don't think this is a defect.