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Bug 471507

Summary: Grid - Default Scheduler statistics update timing
Product: Red Hat Enterprise MRG Reporter: William Henry <whenry>
Component: cuminAssignee: Justin Ross <jross>
Status: CLOSED NOTABUG QA Contact: Frantisek Reznicek <freznice>
Severity: high Docs Contact:
Priority: medium    
Version: 1.0CC: esammons, gsim, jsarenik, matt
Target Milestone: 1.1.1   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2009-01-15 19:28:13 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 470286    
Bug Blocks:    
Attachments:
Description Flags
hour-width graph
none
10minutes-wide graph none

Description William Henry 2008-11-14 01:20:56 UTC 
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):


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Comment 1 Matthew Farrellee 2008-11-14 01:43:02 UTC 
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
Comment 2 Justin Ross 2008-12-05 15:04:47 UTC 
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.
Comment 3 Justin Ross 2008-12-05 22:09:18 UTC 
I made just such a change at revision 2944.
Comment 5 Jan Sarenik 2008-12-17 10:21:10 UTC 
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...
Comment 6 Jan Sarenik 2008-12-17 10:22:08 UTC 
Created attachment 327219 [details]
hour-width graph
Comment 7 Jan Sarenik 2008-12-17 10:22:45 UTC 
Created attachment 327220 [details]
10minutes-wide graph
Comment 8 Jan Sarenik 2008-12-18 08:09:20 UTC 
This bug has a lot to do with 470286, so I recommend pushing it for 1.1.1.
Comment 9 Justin Ross 2009-01-15 19:28:13 UTC 
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.