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From David Boreham <>
Subject Re: [Replication] Using time offsets instead of absolute time
Date Tue, 20 Jan 2009 03:29:05 GMT
It's 2009 not 1989. Systems need correct time anyway. Many other 
replication systems require
synchronized clocks. Don't attempt to solve this problem yourself, use NTP.

Alex Karasulu wrote:
> Hi all,
> The first thread on replication after Emmanuel's comments started 
> taking a turn towards the question of time synchronization across 
> replicating servers.  Time synchronization is very nice to have and 
> forget about while writing the code around replication.  And yes we do 
> not have control over it since administrators can fudge this up.
> Another alternative would be to have all the servers in the cluster 
> communicate with one another on occasion to share their current time 
> to establish offsets.  These offsets (differences in time) between 
> servers in replication agreements can be used to correct for any time 
> variance we might encounter.  Furthermore if the time is adjusted on 
> the hosts, the cluster can adjust to time changes.
> Alex

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