Hi Bernd, I did not look at the code, but I would guess never. Solr tends to keep file handle for each file that it uses and it keeps last N transaction logs. Transaction log file is flushed and new one is created when you issue hard commit - with or without open searcher. At that moment it will delete the oldest one, but the number of tlogs will remain the same.
Hope that someone more into transaction logs will jump in and correct me if I am wrong. HTH, Emir -- Monitoring - Log Management - Alerting - Anomaly Detection Solr & Elasticsearch Consulting Support Training - http://sematext.com/ > On 9 Oct 2017, at 09:21, Bernd Fehling <bernd.fehl...@uni-bielefeld.de> wrote: > > I'm trying to figure out when transaction logs are closing. > Unfortunately the docs and guides are not very clear about this. > > I tried any combination of commits with waitSearcher true/false, > expungeDeletes true/false, openSearcher true/false. > And also optimize with maxSegements=1. > > The stats of my updateHandler say > transaction_logs_total_number: 2 > transaction_logs_total_size: 59287641 > > A "lsof | grep tlog" reports still many open tlog files. > Actually there are only 2 tlog files but each java process has handles > open to tlog. > > But why they are not closing even after hard commit and optimize > with maxSegments=1 ? > There is no need to keep the tlogs open. Everything is flushed to disk, > optimized, all nodes are up, running and in sync. > > Can someone explain the rules when tlogs are closing? > > Regards > Bernd
