[xymon] hobbitgraph.cgi: Attempting to reuse 'mysqlht'

Tue Nov 30 10:34:34 CET 2010

Thank you for helpful explanation, after I removed FNPATTERN and replaced
@RRDFN@ with mysql.rrd - the graph appeared for the second machine too.

And no, I neither have other mysql*.rrd file in the
/var/lib/hobbit/rrd/HOSTNAME/ directory, nor any of the existing ones had
keys starting with "mysql" string.

--
Arie

On Mon, Nov 29, 2010 at 23:54, Henrik Størner <henrik at hswn.dk> wrote:

> On Sun, 28 Nov 2010 16:30:39 +0200, Arie Skliarouk wrote:
>
> > On Thu, Nov 25, 2010 at 17:59, Henrik Størner <henrik at hswn.dk> wrote:
> >
> >> On Wed, 24 Nov 2010 16:12:07 +0200, Arie Skliarouk wrote:
> >>
> >> > I created a custom mysql parameters check that shows graphs on one
> >> > server, but not on the other. hobbitgraph.sh (hobbitgraph.cgi?) kept
> >> > sending following error instead of the actual image:
> >> > <html><head><title>Invalid request</title></head> <body>Attempting to
> >> > reuse 'mysqlht'</body></html>
> >>
> >> This is an error from the rrdtool library. So I would suspect something
> >> dodgy with the graph-definition in hobbit-graphs.cfg, or the RRD file
> >> data is not as you would expect.
> >>
> >> Could you show us the graph definition you use ?
> >
> >
> > See attached.
>
> OK, the interesting part of your graph definition looks like this:
>
> [mysql]
>    FNPATTERN mysql.rrd
>    TITLE MySQL
>    YAXIS Number
>    DEF:mysqlht=@RRDFN@:mysqlht:AVERAGE
>    DEF:mysqlhs=@RRDFN@:mysqlhs:AVERAGE
>    DEF:mysqlhq=@RRDFN@:mysqlhq:AVERAGE
>    LINE2:mysqlht#00CCCC:MySQL threads
>    LINE2:mysqlhs#ff0000:Slow queries
>    LINE2:mysqlhq#ff00ff:Queries per sec
>
> The problem occurs because you're using an FNPATTERN definition, but you
> only expect one file to match. I'll bet that the problem host has another
> RRD file present which matches "mysql.rrd" - there is no anchor in the
> pattern, so a file "blablamysql.rrd" will also match this pattern. Or
> even "mysql.rrd.old".
>
> When you have multiple files that match FNPATTERN, the rest of the
> definition is repeated for each file when Xymon tells RRDtool how to
> generate the graph. So you'll end up with two DEF lines that define a
> "mysqlht" variable - one for each file that matches FNPATTERN. That
> is not allowed, and causes RRDtool to complain with the error you see.
>
> If you only want to use one specific RRD file, don't use FNPATTERN.
> Instead, put the filename where you have "@RRDFN@" now:
>
> [mysql]
>    TITLE MySQL
>    YAXIS Number
>    DEF:mysqlht=mysql.rrd:mysqlht:AVERAGE
>    DEF:mysqlhs=mysql.rrd:mysqlhs:AVERAGE
>    DEF:mysqlhq=mysql.rrd:mysqlhq:AVERAGE
>    LINE2:mysqlht#00CCCC:MySQL threads
>    LINE2:mysqlhs#ff0000:Slow queries
>    LINE2:mysqlhq#ff00ff:Queries per sec
>
> Just for the record, if you DO want to match multiple files, then you
> must include the index-number in the DEF and GPRINT definition. E.g.
>
> [mysql]
>    FNPATTERN mysql.rrd
>    TITLE MySQL
>    YAXIS Number
>    DEF:mysqlht at RRDIDX@=@RRDFN@:mysqlht:AVERAGE
>    DEF:mysqlhs at RRDIDX@=@RRDFN@:mysqlhs:AVERAGE
>    DEF:mysqlhq at RRDIDX@=@RRDFN@:mysqlhq:AVERAGE
>    LINE2:mysqlht at RRDIDX@#@COLOR@:@RRDPARAM@ MySQL threads
>
> See e.g. the [la] and [disk] definitions in the standard graphs.cfg /
> hobbitgraph.cfg file.
>
>
> Regards,
> Henrik
>
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>
>
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