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Re: [dist-obj] Seven Fallacies Reference


A quick elaboration (since I liked this presentation, and now that
i've refreshed my memory):

Brewer used to talk about the "CAP" theorem, where CAP stands for
Consistency, Availability and tolerance to network Partitions:

Thm: "You can have *at most two* of the CAP properties in a shared-data
system"

So, any system has to forfeit at least one of these:

2-phase commit systems, Single-site dbs, xFS file systems, LDAP, etc.,
forfeit Partition-tolerance

Distributed dbs, distributed locking, majority protocols, etc. forfeit
availability

Coda, web caching, DNS, etc. forfeit Consistency

...and so on

pb

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