[rrd-developers] [PATCH] rrd_open and rrdcached

Tobias Oetiker tobi at oetiker.ch
Wed Oct 22 14:21:26 CEST 2008

Kevin ?


Today Daniel.Pocock at barclayscapital.com wrote:

> rrdcached makes some calls to access and stat, which don't work for my
> virtual filesystem abstraction.
> This patch:
> - provides implementations of rrd_stat and rrd_access, invoking the C
> library methods by default
> - modify rrdcached to use the rrd_open API for these methods
> - update Makefile.am so that rrdcached links with the rrd_open API
> I'm not sure whether rrdcached is meant to link with rrd_open.  The
> alternative: update the rrdtool C API to include some higher level
> functions that can be called from rrdcached and other RRD-based apps.
> This may even mean that some of the logic from rrdcached has to be moved
> into such functions.
> I'm also coming up against similar issues with Ganglia - gmetad wants to
> know if the RRD files already exist on disk, even though they only exist
> in my virtual back-end.  To deal with that, I'm thinking of adding some
> methods to the RRD API so that applications can do things like browsing
> the directory of RRDs.
> Regards,
> Daniel
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Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900

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