Tobi,
I have tracked this bug some more. In earlier versions of rrdtool (< 1.0.7)
or maybe earlier,
it seemed that these spikes, or invalid data occurred randomly, out of the
blue, in
rrd databases that didn't have limits established. Maybe they still do.
I know these spikes didn't occur
because of erroneous data. Also, I am fairly certain that the majority of the
databases
where these spikes occurred, did not have the "non-byte" boundary counter reset
or rollover
issues (I am using the COUNTER database type).
I have reproduced this bug. I've only been able to document one rrd that has
one piece of invalid data in it. It will occur whether the rrd has limits
established
or not.
Here are the instructions (or commands), I used to reproduce this bug. It
involves
the dump, restore, and tune commands. So far, I have only been able to
reproduce
the bug using the method I describe below. Nevertheless, I believe that this
problem
or bug can manifest itself in other ways.
I am using version 1.0.8 of rrdtool. I am including the data files I used to
reproduce
this problem. Here is the sequence of shell commands I ran:
rrdtool create my.rrd -b 946843500 -s 300 "DS:load:GAUGE:300:0:5000"
"DS:out_oct:COUNTER:300:0:1250000" "DS:drop_oct:COUNTER:300:0:U"
"DS:out_pkts:COUNTER:300:0:25000" "DS:drop_pkts:COUNTER:300:0:U"
"RRA:AVERAGE:0.5:1:864" "RRA:AVERAGE:0.5:3:1344" "RRA:AVERAGE:0.5:12:744"
"RRA:AVERAGE:0.5:288:91"
foreach i ( `cat file1`)
rrdtool update my.rrd $i
end
rrdtool dump my.rrd > db.out
rrdtool restore -r db.out my.rrd
rrdtool tune my.rrd -a out_oct:1250000 -a out_pkts:25000
foreach i ( `cat file2`)
rrdtool update my.rrd $i
end
Now, examine the rrd at this point, and you will find invalid data:
rrdtool dump my.rrd > db.out
rrdtool restore -r db.out db.xml
out of range found [ds: 3], [value : 1.9991590274e+37]
Steve Bishop
Developer
Verio, Inc.
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