Clustering question (Roller 2.0)

[Bryan Field-Elliot]

We have two instances of Roller running, backed by the same database,
same file uploads directory, same Lucene search engine directory, etc. I
just wanted to double check that this should be fine, no gotchas with
file contention etc? I'm particularly curious about the Lucene search
index directory, is it going to be just fine when shared across multiple
running instances who may try to add to the index at the same time?