Bug 471507 - Grid - Default Scheduler statistics update timing
Summary: Grid - Default Scheduler statistics update timing
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise MRG
Classification: Red Hat
Component: cumin
Version: 1.0
Hardware: All
OS: Linux
medium
high
Target Milestone: 1.1.1
: ---
Assignee: Justin Ross
QA Contact: Frantisek Reznicek
URL:
Whiteboard:
Depends On: 470286
Blocks:
TreeView+ depends on / blocked
 
Reported: 2008-11-14 01:20 UTC by William Henry
Modified: 2015-11-16 00:06 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2009-01-15 19:28:13 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)
hour-width graph (14.79 KB, image/png)
2008-12-17 10:22 UTC, Jan Sarenik
no flags Details
10minutes-wide graph (42.73 KB, image/png)
2008-12-17 10:22 UTC, Jan Sarenik
no flags Details

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):


How reproducible:


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Additional info:

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.


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