[erlang-questions] auto-syncing mnesia after a network split
Tue Dec 2 22:30:36 CET 2008
On Tuesday, December 02, 2008, Joel Reymont wrote:
> On Dec 2, 2008, at 8:24 PM, David Mercer wrote:
> > How do you handle unsynched clocks on the two nodes?
> I don't know. Should they go out of sync during the split if the split
> is short?
Aren't clocks always out of synch? I thought it was impossible to perfectly
synch clocks due to signal transmission times, at least over a standard
network. Even if the clocks were precisely in-synch, same problem if the
same transaction is received by the two nodes a microsecond apart: they'll
have different timestamps. I wonder if adding some sort of GUID would solve
the problem... Maybe a client-generated ID.
Another thought is that two transactions can be received by different nodes
in different order, resulting in different vnums for the same transactions
on different nodes.
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