I can't seem to find a definitive answer. I have ten threads doing my indexing and I block all the threads when one is ready to do a commit so no adds are done until the commit finishes. Is this still required in SOLR 1.4 or could I take it out? I tried testing this on a separate small index where I set autocommit in solrconfig and seem to have no issues just continuously adding documents from multiple threads to it despite its commit activity. I'd like to do the same in my big main index, is it safe?
Also, is there any difference in behavior between autocommits and explicit commits in this regard?
