[rrd-users] rrdcached updating too fast

[Hassan Noureddine]

Hi all,

I was debugging the root cause of getting a long list of rrdcached  log errors. like the on below. ( Illegal attempt to update in less than 1 sec. step).

[err] collectd[3565]:  rrdcached plugin: rrdc_update (/usr/var/.../df-root/df_complex-free.rrd, [1386607176:21342183424.000000], 1) failed with status -1.

The rrdcached is configured to update every 10 seconds, but when running scripts consuming  memory, and cpu usage, I can see single update for some RRDs happening very frequent, causing long list of error logs.

I added debug codes to display update time, once I ran the scripts, I see the updates occur much faster for some of the RRDs. I am listing son below.

rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215341 sec, 387199 usec
rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215351 sec, 387208 usec
rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215351 sec, 395156 usec
rrdcached plugin: rrdc_update (/usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd, [1398215351:36382], 1) failed with status -1.
rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215362 sec, 958488 usec
rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215371 sec, 393588 usec

rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd at 1398215341 sec, 387544 usec
rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd at 1398215351 sec, 387590 usec
rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd at 1398215351 sec, 488583 usec
rrdcached plugin: rrdc_update (/usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd, [1398215351:0], 1) failed with status -1.
rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd at 1398215362 sec, 958920 usec
rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd at 1398215371 sec, 393950 usec

Have this issue been addressed, and if not, which part of the code could be causing it.

Thanks.
 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.oetiker.ch/pipermail/rrd-users/attachments/20140422/ddee820c/attachment.htm