: For full reindexes (DIH full-import), I use build cores, then swap them with : the live cores. I don't do this for performance reasons, I do it because I : want to continue making incremental updates to the live cores while the : rebuild is underway. The rebuild takes four hours.
that's kind of a special case though -- the OP mentioned that the entire reason he does full rebuilds is because he has no way of inrementally tracking changes to his source data, so he's clearly not going to be making incremental updates to a "live" core. in the simpler case of "rebuild the full index ever N hours, never to incremental updates" a simple master/slave setup is probably the easiest -- with a single "snappull" command being triggered once you know the full index is build. If you only have one machine to work with, then another simple appropach is just use a single solr core, and rebuild ontop of your existing data every N hours. You can use a "timestamp" field to keep track of when documents were added and do a deleteByQuery on the timestamp field at the end of teh "rebuild" to remove any old documents (ie: things no longer in your source data) as long as you don't commit until the end of your "rebuild" you don't need to worry about inconsistent data, and you should wind up using less resources then the core swapping approach. -Hoss
