Clustering 3.x or 4.x

[divine_comedy]

We are thinking of taking the plunge (clustering our servers).

Should we wait until the 4.0 version is available. We are currently on
3.2.3 ? It was painful to upgrade from 2.4.4 to 3.0 and basically I want to do it right once.

[monocongo]

I'm running 3.2.5 with clustering, and it was relatively painless to move from 3.2.3.

--James