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2261 Views 2 Replies Latest reply: Sep 19, 2011 2:00 PM by dpetzel RSS
dpetzel Rank: Brown Belt
dpetzel
1,141 posts since
Oct 17, 2010
Currently Being Moderated

Sep 17, 2011 9:14 PM

getRRDValues when datasource name contains a space

So I've been playing around with creating some time based reports as outlined in message/32004#32004 and message/60977#60977. I've managed to get it work, however I ran into a bump with a certain set of datasources I want to include. I have data sources that contain spaces in the names.

 

So take something like 'ServiceName HTTP totalServicedSum_totalServicedSum.rrd'

 

As a simple example I have:

print d.getRRDValues(['ServiceName HTTP totalServicedSum'],

                         start=startDate, end=endDate, function=how)

 

It results in a traceback:

 

ERROR:RenderServer:Failed while generating summary

Traceback (most recent call last):

  File "/opt/zenoss/Products/ZenRRD/RenderServer.py", line 346, in summary

    values = rrdtool.graph(*gopts)[2]

error: Cannot parse vname from 'DEF:ServiceName HTTP totalServicedSum_r=/opt/zenoss/perf/Devices/DeviceName/ServiceName HTTP totalServicedSum_totalServicedSum.rrd:ds0:AVERAGE'

WARNING:RenderServer:/dev/null DEF:ServiceName HTTP totalServicedSum_r=/opt/zenoss/perf/Devices/DeviceName/ServiceName HTTP totalServicedSum_totalServicedSum.rrd:ds0:AVERAGE CDEF:ServiceName HTTP totalServicedSum_c=ServiceName HTTP totalServicedSum_r VDEF:ServiceName HTTP totalServicedSum=ServiceName HTTP totalServicedSum_c,MAXIMUM PRINT:ServiceName HTTP totalServicedSum:%.2lf --start=1316203200 --end=1316206800

ERROR:zen.RRDView:Cannot parse vname from 'DEF:ServiceName HTTP totalServicedSum_r=/opt/zenoss/perf/Devices/DeviceName/ServiceName HTTP totalServicedSum_totalServicedSum.rrd:ds0:AVERAGE'

Traceback (most recent call last):

  File "/opt/zenoss/Products/ZenModel/RRDView.py", line 167, in getRRDValues

    vals = perfServer.performanceCustomSummary(gopts)

  File "/opt/zenoss/Products/ZenModel/PerformanceConf.py", line 400, in performanceCustomSummary

    return server.summary(gopts)

  File "/opt/zenoss/Products/ZenRRD/RenderServer.py", line 346, in summary

    values = rrdtool.graph(*gopts)[2]

error: Cannot parse vname from 'DEF:ServiceName HTTP totalServicedSum_r=/opt/zenoss/perf/Devices/DeviceName/ServiceName HTTP totalServicedSum_totalServicedSum.rrd:ds0:AVERAGE'

 

Based on http://oss.oetiker.ch/rrdtool/doc/rrdgraph_data.en.html

Variable names (vname) must be made up strings of the following characters A-Z, a-z, 0-9, -,_and a maximum length of 255 characters.

 

So it would appear that when its trying to generate the VDEF name, it contains illegal characters in the form of the spaces.

 

Anyone have any ideas, on how I could get this to work?

  • dpetzel Rank: Brown Belt
    dpetzel
    1,141 posts since
    Oct 17, 2010
    Currently Being Moderated
    1. Sep 18, 2011 10:33 PM (in response to dpetzel)
    Re: getRRDValues when datasource name contains a space

    So I managed to get this to work on a test system, but I'm fairly certain my approach would be frowned upon, and probably not the greastest idea on my production system.

     

    I've hacked an updated to RRDView.py

     

    Starting on line 155 of $ZENHOME/Products/ZenModel/RRDView.py

     

    From:

    gopts.append("DEF:%s_r=%s:ds0:AVERAGE" % (dsname,filename))

    gopts.append("CDEF:%s_c=%s_r%s" % (dsname,dsname,rpn))

    gopts.append("VDEF:%s=%s_c,%s" % (dsname,dsname,function))

    gopts.append("PRINT:%s:%s" % (dsname, format))

     

    To:

    gopts.append("DEF:%s_r=%s:ds0:AVERAGE" % (dsname.replace(" ","_"),filename))

    gopts.append("CDEF:%s_c=%s_r%s" % (dsname.replace(" ","_"),dsname.replace(" ","_"),rpn))

    gopts.append("VDEF:%s=%s_c,%s" % (dsname.replace(" ","_"),dsname.replace(" ","_"),function))

    gopts.append("PRINT:%s:%s" % (dsname.replace(" ","_"), format))

     

    After doing this, I can seem to fetch data from data sources that have spaces in the name. I have no idea how much other damage it might do though.

  • dpetzel Rank: Brown Belt
    dpetzel
    1,141 posts since
    Oct 17, 2010
    Currently Being Moderated
    2. Sep 19, 2011 2:00 PM (in response to dpetzel)
    Re: getRRDValues when datasource name contains a space

    So I managed to get this working thanks to some guidance from rmatte in IRC, via a slightly different approach. Pasting a small sample in case it helps someone else, or myself when i need to do this again.. Obvious variable, resolution, cfunc replaces apply as needed

     

    dps_to_collect = ['Service HTTP totalServicedSum_totalServicedSum']

    for d in dmd.Devices.getOrganizer("/").getSubDevices():

        for dp in d.getRRDDataPoints():

            if dp.name() in dps_to_collect:

                print d.fetchRRDValue(dp.name(), "MAX", 3600, start=slot_start, end=slot_end)

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