Hi Lars,
On 20 April 2010 03:32, Lars Kellogg-Stedman <[email protected]> wrote:
>
> Are you running the version of check_ganglia from exchange.nagios.org
> (http://bit.ly/akp88N)? This includes a mode that uses the query
> server provided by gmetad to only grab the XML for a specific host
> rather than dumping the entire tree. I haven't used this particular
> plugin myself (I've written my own), but it looks like the invocation
> would be something like:
>
> check_ganglia -H localhost -P 8652 \
> -O hostcheck \
> --cluster 'My Cluster Name' \
> -T my.target.host
>
> In experiments with my own code, using the gmetad query interface is
> substantially (3x to 4x) faster -- and this is with a small (< 50) set
> of monitored hosts.
>
>
I wasn't aware of this interface when I wrote my plugin; certainly I can see
the advantages of this approach. I did look at the perl plugin you mentioned
but it has a few dependencies, one of which is not distributed with RH
(DateTime) and is a pain to install and maintain (thanks in large part to
Build.PL). In the end it was easier for me to write a shell script to get
the information I want and the result is quick enough. From there it was
easy to convert to a python script (the only dependency being the RRD python
module), which is even quicker.
> This should compare favorably with the overhead of polling a RRD file
> (and seems like a cleaner solution).
>
I take your point. I may have a look at implementing an XML variant as well
for comparison's sake. From what I can see, though, GMetad uses the same RRD
libraries as the python module and the rrdtool command line, with a similar
mechanism for identifying which database to interrogate, so I kinda hope
that the performance will be equivalent :).
Malcolm.
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