Hi Antonio, maybe you are experiencing this issue due to garbage collection problems (not solr), have you tried to monitor the GC logs?
On Fri, Aug 8, 2025 at 10:29 AM Antonio Nunziante <nunzia...@light-sf.com> wrote: > Hello, > > > > we are experiencing an occasional performance issue with our Solr cluster. > > Normally, the average search time is around *50 ms*, but from time to > time we see a query taking *up to 120 seconds* to complete. > > This behavior is rare but concerning, especially because it sometimes > happens during *periods of very low traffic*. > > > > *Technical environment:* > > - Apache Solr 8.11.1 deployed in a 3-node cluster > - Red Hat, Inc. OpenJDK 64-Bit Server VM *11.0.25* (build > 11.0.25+9-LTS) > > > > We would like to understand: > > - What could cause such a sudden slowdown in otherwise fast searches? > - Which Solr metrics, logs, or debugging tools should we check to > pinpoint the root cause? > - Are there recommended practices for capturing detailed query > execution traces when these rare slowdowns occur? > > > > Any guidance or suggestions on how to monitor and diagnose this type of > sporadic latency would be greatly appreciated. > > > > Thank you, > Antonio > -- Vincenzo D'Amore
