Hi, What's going on is Lucene doing merges of segments, and when it so does, all documents marked for deletion in the old segments are gone, freeing up space. I recommend planning for 2-3x more disk space than your minimum need, both for worst-case merge, future growth and flexibility (e.g. re-indexing to another collection). See more about merges in this article: https://lucidworks.com/post/solr-segment-merge-frees-wasted-space-caused-by-deleted-documents/
Jan > 3. nov. 2023 kl. 10:42 skrev Koen De Groote <kdg....@gmail.com>: > > Hello, > > I'm reading online that deleting items doesn't actually remove them from > disk, it merely marks them as "deleted". > > And that in order to free disk space by removing deleted items, I need to > do an "optimize" or "expungeDeletes" call. > > Having run a bunch of deletes on a collection, over a few hours, I noticed > the used disk space for this collection did indeed go down. Looking at > metrics, it seems every hour or so, a chunk of disk space was freed up. > > > So what's actually going on here? I was under the impression that nothing > would be freed up and I would need to call "optimize". > > > Regards, > Koen
