Hi: I was testing master commit fb9150f and upgrade from sphinx 2.2 to 3.3.1. according to piler manual, I need to reindex everything. so I install a new machine. copy /var/piler and /var/lib/mysql to new machine and do procedure below: rm -f /var/piler/sphinx/* runuser -u piler -- indexer --all --config /etc/piler/sphinx.conf cd /var/piler/tmp runuser -u piler -- reindex -a (why this command didn't need to specify /etc/piler/sphinx.conf?) I found I can not understand what happened. the size at old system: /var/piler/sphinx => 300MB /var/lib/mysql/piler/sph_index.ibd => 22M the size at new system after reindex: /var/piler/sphinx => 89M, which didn't change at all at the reindex process /var/lib/mysql/piler/sph_index.ibd => become 1.9GB /var/piler/tmp => 17G, the same size as /var/piler/store so the whole process seems extract mails from /var/piler/store to /var/piler/tmp, and write to mysql. I don't know is this behavior correct? why reindex touch nothing at /var/piler/sphinx and why mysql db become so huge. I try to open piler web UI and do some mail search, it seems working fine, but I am still confused. thanks a lot for help!!