y axis log scale can't hangle zero values

[Geoff Flarity]

I realize the math issues, but it seems like there should be away to have a logarithmic scale with a zero value in the dataset. Maybe just ignore them?

[Michael Leinartas (mleinartas)]

Here's the error given when a dataset with 0 is used.

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/django/core/handlers/base.py", line 100, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.6/site-packages/graphite/render/views.py", line 171, in renderView
    image = doImageRender(requestOptions['graphClass'], graphOptions)
  File "/usr/lib/python2.6/site-packages/graphite/render/views.py", line 349, in doImageRender
    img = graphClass(**graphOptions)
  File "/usr/lib/python2.6/site-packages/graphite/render/glyph.py", line 178, in __init__
    self.drawGraph(**params)
  File "/usr/lib/python2.6/site-packages/graphite/render/glyph.py", line 610, in drawGraph
    self.setupYAxis()
  File "/usr/lib/python2.6/site-packages/graphite/render/glyph.py", line 974, in setupYAxis
    raise GraphError('Logarithmic scale specified with a dataset with a '
GraphError: Logarithmic scale specified with a dataset with a minimum value less than or equal to zero

[Nicholas Leskiw (nleskiw)]

tested r712, 0 values are ignored on log scale. If anyone can still cause an error, please reopen the bug.

[Mike Zupan (u6pb)]

I can re-create this problem with data we have.. if I set a graph to the last 6 hours.. it is fine.. anything more then that I get the

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/django/core/handlers/base.py", line 100, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/opt/graphite/webapp/graphite/render/views.py", line 166, in renderView
    image = doImageRender(requestOptions['graphClass'], graphOptions)
  File "/opt/graphite/webapp/graphite/render/views.py", line 338, in doImageRender
    img = graphClass(**graphOptions)
  File "/opt/graphite/webapp/graphite/render/glyph.py", line 174, in __init__
    self.drawGraph(**params)
  File "/opt/graphite/webapp/graphite/render/glyph.py", line 515, in drawGraph
    self.setupYAxis()
  File "/opt/graphite/webapp/graphite/render/glyph.py", line 824, in setupYAxis
    raise GraphError('Logarithmic scale specified with a dataset with a '
GraphError: Logarithmic scale specified with a dataset with a minimum value less than or equal to zero

[Michael Leinartas (mleinartas)]

Hmm, I'm somewhat unsure about making this change. Perhaps a solution would be to filter the series through removeBelowValue() first?

[Nicholas Leskiw (nleskiw)]

What are the retention rates on the datafile that errors out?
I'm wondering if this has to do with the aggregation boundary...

-Nick

On Fri, Apr 6, 2012 at 1:11 PM, Michael Leinartas <<email address hidden>
> wrote:

> Hmm, I'm somewhat unsure about making this change. Perhaps a solution
> would be to filter the series through removeBelowValue() first?
>
> --
> You received this bug notification because you are subscribed to
> Graphite.
> https://bugs.launchpad.net/bugs/925635
>
> Title:
> y axis log scale can't hangle zero values
>
> Status in Graphite - Enterprise scalable realtime graphing:
> Fix Committed
>
> Bug description:
> I realize the math issues, but it seems like there should be away to
> have a logarithmic scale with a zero value in the dataset. Maybe just
> ignore them?
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/graphite/+bug/925635/+subscriptions
>

[Nemo_bis (nemobis)]

Mike Zupan, how did you solve your problem, was it just about old data before the upgrade? The logbase had to be disabled in gdash.wikimedia.org (now using 0.9.12) for a graph with some zeros: https://gerrit.wikimedia.org/r/#/c/107367/
Nicholas Leskiw, sorry for the ignorance, what do you mean by aggregation boundary in this context? Can it be configured?