Etcd clock difference warning - can it be ignored and what is the recommendation?

[weikaipan]

Hi Etcd community,

I deployed an etcd cluster and one of the etcd member reports warnings due to high clock difference larger than 1 second
(specifically at this line of code:

plog.Warningf("the clock difference against peer %s is too high [%v > %v]", id, s.ClockDiff(), time.Second)

introduced by #3210

After some research it seems that Lease and TTL might be affected because of the high clock diff according to #9768

However, it seems that etcd is using monotonic time in lease -

#6888

#6700

So I wanted to confirm that

• Can I understand that 1 second is the tolerant clock difference according to the prober code above?
• Can we ignore the warning like 2 or 3 seconds clock diff (something that slightly higher than 1 second)?
• What is the system tolerant (such as tolerated maximum clock diff) clock difference?

Thank you.