[collectd] "uc_update: Value too old" error

[Andreas Schuldei]

this is still an issue for me.
apt-cache policy collectd
collectd:
  Installed: 5.4.1-6+deb8u1

did anything happen regarding this issue? Should i file a bug somewhere?


On Fri, Oct 30, 2015 at 9:10 PM Giovanni Torres <giovanni.torres at gmail.com>
wrote:

My guess is if the message goes away when WriteThreads is 1, then it is
probably not entirely thread safe.

On Fri, Oct 30, 2015, 4:02 PM Richard Elling <
richard.elling at richardelling.com> wrote:

On Oct 30, 2015, at 12:06 PM, Giovanni Torres <giovanni.torres at gmail.com>
wrote:

Looks like setting WriteThreads to 1 stops these messages; see
https://github.com/collectd/collectd/issues/987


Seems like a race. I added nanosecond resolution to the timestamp and have
been collecting
data for a while. We're usually < 25 us off. I think we can add some margin
to the conditional
or at least stop spamming the log when this occurs.

[2015-10-30 15:23:15] uc_update: Value too old: name =
zambezi/vminfo-all/gauge-freemem;value time = 1446218595.580
(1446218595580220672); last cache update = 1446218595.580
(1446218595580231936);

Thoughts?
 -- richard


On Thu, Oct 15, 2015 at 5:31 PM Andreas Schuldei <andreas at schuldei.org>
wrote:

i read the FAQ "I get frequent errors that a “value is too old”. What's
this about?" section.

my collectd runs on my server, no network transmission of data, just local
operation. only one collecd is running:

root     18951  0.0  0.2   1752  1072 ?        Ss   22:50   0:00
/usr/sbin/collectdmon -P /var/run/collectd.pid -- -C
/etc/collectd/collectd.conf
root     18952  1.5  5.5 130352 28732 ?        Sl   22:50   0:08 collectd
-C /etc/collectd/collectd.conf -f

i get lots of those:

Oct 15 23:01:49 david collectd[18952]: uc_update: Value too old: name =
kessel0001.fritz.box/biosmart/gauge-Füllraumtür; value time =
1444942909.000; last cache update = 1444942909.000;

where the "last cache update" increases every 10 sec by 10sec. :-)

i restarted collectd to no avail. since this is an embedded system with
limited disk space i disabled the syslog plugin in collectd.conf, to
prevent syslog from exploding - not the right fix but a bad (temporary)
one.

collectd seems to work fine, the rrd files get updated and all.

how can i fix this properly?
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