Hi rrdtool users! As part of my google summer of code project with Ganglia I'm developing an R package that imports the values from an RRD file into vectors in R (without exporting to csv, xml or other intermediate format first). I'm using the rrdfetch api to do this. Here is a working prototype:
https://github.com/pldimitrov/Rrd Wnile this seems to work fairly well, it struck me that in a scenario when I'm only interested in reading one row at a time (e.g. to compare values from many RRDs simultaneously) , the rrdfetch code would need to go through all error/sanity checks, find the RRA we want and seek to the desired location in the file at each iteration. I know the use of the internal rrd_read, rrd_seek, rrd_open, etc... functions is not encouraged so I'm wondering what might be a good solution. Ideally, it would be useful to have something that iterates one row at a time, reads and caches the data. Does anything like this already exist? Would you agree it makes sense to have this in addition to rrdfetch? Regards, Plamen
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