[collectd] "uc_update: Value too old" error

[Richard Elling]

> 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 <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 <mailto: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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