[erlang-questions] auto-syncing mnesia after a network split
Tue Dec 9 21:59:07 CET 2008
Claes Wikström <> writes:
> Jim McCoy wrote:
>> would be to add some complexity on the mechanics of the join mechanism
>> (e.g. a quorum system like paxos to decide membership and agreement
> A lot of the mnesia clusters only have 2 nodes - thus making
> quorums a no-goer. typical HA telcoms chassis systems have exactly
> two management blades.
i find it quite humorous that the telecoms industry is paying
thousands of people to work on solving this problem (how to reliably
rejoin a partitioned network consisting of two nodes); a problem
that has been proven (over 30 years ago) to have no solution.
30,000 man-years... that a chunk of change(*). certainly a lot more
expensive than adding a third node.
it's less humourous (at least to me) that i personally spent a few
of those man-years, when all I had to do was google on "leslie
(*) yes, i made that figure up. but i do believe it's the right
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