Hi, I had made the same experience. And it not only happens in a cluster. We had two standalone installations and it happened there too. We then switched to a 3 node cluster and can still see some spikes in the response time but they are low enough so that it is negligible for us.
Best regards Mihael Mihael Schmidt Software Engineering Bauformat Küchen GmbH & Co. KG Kattwinkel 1 | 32584 Löhne | Deutschland Fon: +495732 102-379 Fax: +495732 102-300 Mail: mschm...@bauformat.de<mailto:mschm...@bauformat.de> Internet: www.bauformat.de<http://www.bauformat.de> [cid:Logo_BAUFORMAT_sw_130px_61b65919-4a79-4edc-a81a-8b84d76dc540.png] Umsatzsteuer-Identifikationsnummer: DE 124323068 - Steuer-Nr.: 310/5705/0461 / Finanzamt Bünde - Handelsregister Bad Oeynhausen HRA 1801 Komplementärin: Bauformat Küchen Verwaltungs GmbH - Handelsregister Bad Oeynhausen HRB 1465 Geschäftsführer: Michael Assner, Sabine Brockschnieder <https://www.bauformat.de>[cid:e-mailbanner_hausmesse2025_e4a6f417-48a3-4e15-ac78-362c2c6359f4.jpg]<https://hausmesse.bauformat.de/2025/de/> Wir erfüllen unsere Informationspflichten zum Datenschutz gem. Artt. 13-14 DS-GVO durch Veröffentlichung auf unserer Internetseite unter: www.bauformat.de/datenschutz<http://www.bauformat.de/datenschutz> oder durch Zusendung auf Ihre formlose Anfrage. ________________________________ Von: Antonio Nunziante <nunzia...@light-sf.com> Gesendet: Freitag, 08. August 2025 10:27 Bis: users@solr.apache.org <users@solr.apache.org> Betreff: Occasional very slow queries (120s) despite low average latency 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
