[erlang-questions] Re: Conceptual questions on key-value databases for RDBMs users

[Icarus Alive]

On Tue, Nov 9, 2010 at 7:08 PM, Edmond Begumisa
<ebegumisa@REDACTED> wrote:
>
>> - KV stores scale easily
>
> Largely true. But sometimes it's not as easy as they promise. Some things
> work well locally and break when you replicate. And you only realise this
> when you try and scale out. There is some element of false advertising when
> NoSQL folk promise simple scaling, there should be a big red disclaimer
> attached.

That's quite a revelation, for someone (me) whose exposure to NoSQL
(KV stores) is purely theoretical so far. To me that promise of
"scaling easily" was the single biggest motivation, i.e. scaling out
in a large distributed cluster environment. Could you elaborate on
that point, and share some instances, scenarios, examples of what may
be the scaling pitfalls ?