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From Jan Lehnardt <...@apache.org>
Subject Re: ACID vs BASE
Date Tue, 24 Feb 2009 16:11:49 GMT

On 24 Feb 2009, at 17:03, Zachary Zolton wrote:

> Thanks for the reply! It looks like they go into the more advanced
> Bayou consistency, and Byzantine failure modes, but I don't think I'll
> need to cover that soon...
>
> But a more important question:
>
> If I have two couch servers: A and B
>
> And, I want to load-balance users between them, would it be the
> responsibility of the web/app servers to ensure that a user session
> "sticks" to either A or B, after performing a write/update? At least
> until the data has had a chance to replicate between servers...?
>
> (I'm guessing this is what all the "monotonic updates discussion is  
> about...?)

That would be one solution*, yes. Another would be to employ a write- 
through
memcache.

* http://www.facebook.com/note.php?note_id=23844338919&id=9445547199&index=0

Cheers

Jan
--


>
> On Tue, Feb 24, 2009 at 9:54 AM, Jan Lehnardt <jan@apache.org> wrote:
>>
>> On 24 Feb 2009, at 16:49, Zachary Zolton wrote:
>>
>>> As a developer (without an advanced degree :^P) trying to understand
>>> Eventual Consistency, I happened upon these slides:
>>>
>>> http://www.cs.berkeley.edu/~istoica/classes/cs268/06/notes/20-BFTx2.pdf
>>>
>>> I know consistency models are a hot topic around here, so I thought
>>> I'd ask if this would make a good introductory text for me to  
>>> explain
>>> the techniques to some colleagues of mine. Or does anyone take
>>> theoretical issue with it contents?
>>
>> I skimmed the contents and it looks cool to me for an introduction.
>>
>> Cheers
>> Jan
>> --
>>
>>
>


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