Roller uses Lucene for search and Lucene stores its search index on disk. So, if you have multiple Roller instances running you can either 1) have both Lucene instances write to the same disk file which will fail 2) have two inconsistent search indexes which will be extremely irritating or 3) turn off Roller's build-in search and use some external spider.
For those who are not happy with those choices, I offer this proposal to use a) Apache Solr and b) some improvements to Roller's plug-in infrastructure to enable a cluster-able search implementation in Roller. http://cwiki.apache.org/confluence/x/_5kB Feedback is welcome. - Dave
