Alex van den Bogaerdt wrote: >> I am developing NMS with ability to store variables (interface counters, >> temperature, environment, etc) in RRD. Due to heavy load >> (hundreds of thousands values stored in RRD per minute) I use some sort of >> buffering - counters from hardware with timestamps >> temporary stored in memory queues and periodically entire queue that relates >> to given RRD file stored into this file by separate >> thread using single command like that: >> >> ::Rrd::update file_path --template In:Out 1187065338:12345:6789 >> 1187065358:123456:67890 ... > > Sounds good. > > >> But sometimes such updates fails with error like that: >> >> RRD Error: illegal attempt to update using time 1187065338 when last update >> time is 1187065682 (minimum one second step) >> >> This error occures with different RRD files with different structures. I >> added debugging output regarding this problem, and this >> debug shows that before this error was no attempt to update this RRD file >> using timestamp 1187065682 at all, and failed command also >> does not contain argument with this timestamp. > > I understand what you are saying, but I don't agree 100%. What you have > shown is that you believe there is no such update. See below. > >> How this can happen ? Any ideas ? I have only one idea - sometimes RRD >> file's last update time is time of real update, and not the >> latest timestamp from rrdupdate's data arguments, and if previous update >> happened later than the first counter value appears in >> memory queue, than such error will encounter on the next update. > > This sounds reasonable however it would mean a bug in RRDtool, one which > only manifests itself once in a while. > > If you can reproduce the problem by replaying your logged updates, > some bughunting is necessary. But before this, I think it is fair > to at least consider the possibility that you overlooked something.
Hmm... It seems that this error appears when I tried to update just created empty RRD file with record that have timestamp in the past (RRD files created on-the-fly when necessary), so this is documented situation and I should use --start parameter for rrdcreate command to avoid this. -- Oleg Derevenetz <[EMAIL PROTECTED]> OOD3-RIPE Phone: +7 4732 539880 Fax: +7 4732 531415 http://www.vsi.ru CenterTelecom Voronezh ISP http://isp.vsi.ru _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
