I recall reading somewhere that, due to global time differences across servers, we cannot rely on timestamps to draw certain conclusions about GAE data e.g. operation sequence, etc.
Time synchronisation is a critical issue in any distributed app yet I have been unable to get hard facts and figures on how well Google synchronises its servers globally. I assume some form of NTP syncing is performed so I would expect that steady state drift will be of the order of milliseconds across the globe. But what if a server is rebooted or added to the Google network? Will this server be disabled until it has reached a certain sync level. In a nutshell, a few questions... 1. How accurate are Google server clocks re: some global standard? 2. What is the maximum drift between servers? 3. Is tighter synchronisation guaranteed between servers in a local data centre servicing entity groups TIA, rvjcallanan --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
