As I pointed out in my response, you should distinguish hard and soft
failures. If one machine fails even catastrophically, you can provide a new
machine to replace it, thus converting a hard failure into a soft one.
The conclusion is the same. Three machines is vastly better than one or
On Wed, Mar 31, 2010 at 1:12 PM, Henry Robinson <he...@cloudera.com> wrote:
> With majority-based quorums, a 2 node ensemble will fail if either machine
> fails. This is the same as a 1 node ensemble - if one machine fails, the
> ensemble fails.
> But with the 2 nodes, you have (roughly) double the probability of
> experiencing a single failure, with the same failure profile.