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From Eric Hauser <ewhau...@gmail.com>
Subject Re: How reliable is cassandra?
Date Mon, 29 Mar 2010 20:14:55 GMT
Thanks to all that responded.  That was helpful information.


On Mon, Mar 29, 2010 at 3:45 PM, Jonathan Ellis <jbellis@gmail.com> wrote:

> On Mon, Mar 29, 2010 at 2:41 PM, Joe Stump <joe@joestump.net> wrote:
> > I know at least three Diggers patrol the list and one of them is a
> committer to Cassandra. Last I heard from my former coworkers at Digg was
> that ZooKeeper can be more overhead than wanted when doing locks in a high
> write environment.
>
> ZK basically does 2PC for each write, so all the ZK members need to be
> in the same datacenter.  Digg is operating 2 data centers now, so
> that's not a good fit -- either you have bad latency every time a
> client in the 2nd DC needs to access ZK or everyone has terrible write
> performance.
>
> ZK should be fine in a single datacenter though.
>
> -Jonathan
>

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