Re: How to make Ruby _THE_ scripting language of choice, fold in SQLite

On Saturday 27 September 2008 20:34:32 Clifford Heath wrote:
David Masover wrote:
Again, it's difficult to argue against this when you haven't told me which
ones aren't supported, and why.

DVCS exists because isolation isn't needed, since tools like patch
can often resolve conflicts and when they can't, a human can.

DVCS does, in fact, provide isolation (most checkouts are not public until
pushed to a public server).

And tools like patch are severely limited by not actually knowing much about
the application at hand. Most newer VCSes are much smarter about resolving
conflicts, but at a certain point, since the VCS doesn't actually know what a
certain line of code does, it can't necessarily know which version of that
line is the correct one -- it can only guess from context.

Compare this to application-specific conflict resolution -- it's quite
possible that simply examining the two conflicting states is enough to decide
which is correct.


I'll go read the Dynamo paper again, then...

From <http://www.allthingsdistributed.com/2007/10/amazons_dynamo.html>:
"To achieve this level of availability, Dynamo sacrifices consistency under
certain failure scenarios."

From the same article:

"Dynamo is used to manage the state of services that have very high
reliability requirements and need tight control over the tradeoffs between
availability, consistency, cost-effectiveness and performance."

But you're right here, and I withdraw any claim of solid ACID properties of
Dynamo. I do agree with this, though:

"Experience at Amazon has shown that data stores that provide ACID guarantees
tend to have poor availability. This has been widely acknowledged by both the
industry and academia."

.

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