Hi Christophe,
Like William said the message "csngen_new_csn - Sequence rollover; local
offset updated." is not alarming and IMHO are likely related to the NTP
update.
The sequence number (seq_num) is a sub second counter increased for each
write operation. It can also jump ahead to a seq_num value of a received
replicated update. In short if a replica timestamps an update with a
high seq_num, this high seq_num will be propagated to the others replica.
It looks not realistic to process 65K updates in the same second. So the
only thing I can think of is a jump of system time (ahead and/or
backward) on one of the replica. This jump can be transient.
If such jump occurred, the next CSNs will be timestamped with the same
second but this timestamp will last longer than an actual second. In
such case we can process many writes, timestamped in the same second,
increasing only the sequence number.
The NTP update, likely triggered a jump. This jump was consumed by the
regular clock ticking. During this period, seq_num rollover several
times. Then when the jump was totally consumed, seq_num reset at each
change of second and no longer rollover.
best regards
thierry
On 2/6/20 1:09 AM, Christophe Trefois wrote:
Dear @William
Thank you a lot for this nice answer and explanations.
We did update and harmonise the ntp server of all 8 FreeIPA servers that we have and continued to see a lot of these errors above over the next couple weeks.
However, since 10 days ago, all messages of this sort stopped and have not yet returned.
Is there some catch up mechanism that somehow was able to "heal" ?
Thanks a lot for your insights,
Christophe
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