On 11/28/2016 11:06 AM, Walter Underwood wrote: > Worst case: > 1. Disable merging. > 2. Delete all the documents. > 3. Add all the documents. > 4. Enable merging. > > After step 3, you have two copies of everything, one deleted copy and one new > copy. > The merge makes a third copy.
Just getting around to replying to this REALLY old thread. What you've described doesn't really triple the size of the index at the optimize/forceMerge step. While it's true that the index is temporarily three times it's *final* size, it is not three times the pre-optimize size -- in fact, it would only get 50 percent larger. Does this mean that the recommendation saying "need 3x the space for normal operation" is not in fact true? The Lucene folks seem to be pretty adamant in their assertion that a merge to one segment can triple the index size, although I've never seen it actually happen. Disabling and re-enabling merging is not what I would call "normal." Thanks, Shawn
