google-code-export / objectify-appengine

Automatically exported from code.google.com/p/objectify-appengine
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Incorrect explanation of Monotonic class in comment #73

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago
The comment on the Monotonic.java class says:

"You also cannot use datestamps for time-ordering because clock skew among GAE 
instances is not guaranteed to fall within any particular bound; they could, in 
theory, be minutes off."

It is incorrect that the clocks could be minutes off because app engine's 
machines are NTP synchronized.  Their clocks should be within milliseconds of 
eachother.

See:
http://stackoverflow.com/questions/2604223/google-app-engine-is-there-a-way-to-g
et-some-sort-of-current-time-that-would-be

Original issue reported on code.google.com by kwste...@gmail.com on 21 Feb 2011 at 3:12

GoogleCodeExporter commented 9 years ago
You can ignore my above comment and this issue. Seems that other people are 
saying that there could be significant clock skew.

Original comment by kwste...@gmail.com on 21 Feb 2011 at 3:27

GoogleCodeExporter commented 9 years ago
There are anecdotal reports of some machines being minutes off :-(

Original comment by lhori...@gmail.com on 21 Feb 2011 at 6:33