[rrd-developers] rrd_fetch seek issue

Tobias Oetiker tobi at oetiker.ch
Thu Nov 27 11:57:23 CET 2008

Hi Daniel,

(I have not yet looked at the code).

I just tried to reproduce the problem here and it did not work.

I guess you are hitting some sort of a corner case ... can you
create a little demo script ...


Daniel.Pocock at barclayscapital.com wrote:

> If an RRD hasn't been updated recently, and I try to invoke rrd_fetch
> for a more recent time interval, it tries to seek on the file anyway - I
> only discovered this issue when the RRD hadn't updated for over 2 hours,
> and it tried to seek beyond the end of the file, causing this "seek
> error in RRA" from rrd_fetch.c:
>     /* fill the gap at the start if needs be */
>     if (start_offset <= 0)
>         rra_pointer = rrd.rra_ptr[chosen_rra].cur_row + 1;
>     else
>         rra_pointer = rrd.rra_ptr[chosen_rra].cur_row + 1 +
> start_offset;
>     if (rrd_seek(rrd_file, (rra_base + (rra_pointer * (*ds_cnt)
>                                         * sizeof(rrd_value_t))),
>                  SEEK_SET) != 0) {
>         rrd_set_error("seek error in RRA");
>         goto err_free_data;
> This suggests more range checking is needed on both the start and finish
> times and how they relate to the last_update time for the RRD.
> 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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