Hi All,
We are testing the RRDCached plugin but are seeing a number of errors in syslog
from collectd servers:
rrdcached[14880]: queue_thread_main: rrd_update_r
(/var/lib/rrdcached/db/collectd/xxxxxxxxx/disk-dm-0/disk_time.rrd) failed with
status -1. (/var/lib/rrdcached/db/collectd/xxxxxxxxxxx/disk-dm-0/disk_time.rrd:
illegal attempt to update using time 1367363996 when last update time is
1367364056 (minimum one second step))
collectd[32487]: uc_update: Value too old: name = xxxxxxxxxxx/cpu-3/cpu-user;
value time = 1367364236.000; last cache update = 1367364236.000;
rrdcached plugin: rrdc_update
(/var/lib/rrdcached/db/collectd/xxxxxxxxxxx/df/df-root.rrd,
[1367364236:98146201600.000000:1892331495424.000000], 1) failed with status -1.
The RRDCached plugin configurations is as follows:
<Plugin rrdcached>
DaemonAddress "unix:/var/run/rrdcached.sock"
DataDir "/var/lib/rrdcached/db/collectd"
CollectStatistics true
</Plugin>
<Plugin rrdtool>
DataDir "/var/lib/rrdcached/db/collectd"
CacheTimeout 60
CacheFlush 3600
WritesPerSecond 1800
RandomTimeout 30
</Plugin>
We do see that the RRD files (at least some or most of them) are being updated
(with new timestamps).
The rrdcached process seems to have 6 threads:
25379 root 20 0 148m 1236 464 S 0 0.0 0:00.11 rrdcached
25380 root 20 0 148m 1236 464 S 0 0.0 0:00.00 rrdcached
25381 root 20 0 148m 1236 464 S 0 0.0 0:00.00 rrdcached
25382 root 20 0 148m 1236 464 S 0 0.0 0:00.00 rrdcached
25383 root 20 0 148m 1236 464 S 0 0.0 0:00.00 rrdcached
25384 root 20 0 148m 1236 464 S 0 0.0 0:00.00 rrdcached
Any suggestions on what we did wrong?
Thanks.
Yuantai
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