Hi Team, We recently upgraded Solr from version 9.3 to 9.8.1 and have not observed any performance degradation with the following configurations in place:
Schema changes were applied to maintain backward compatibility with version 9.3, following the official upgrade guidelines https://solr.apache.org/guide/solr/latest/upgrade-notes/solr-upgrade-notes.html . *We retained the default settings introduced in recent versions:* DocValues enabled by default in Solr 9.7 Uninvertible fields disabled in Solr 9.8 We are using the SolrJ client version 9.8. Additionally, we made the following performance-related changes: *On the server side:* Enabled *-Dsolr.segment.threads=true* in the startup script. Set* indexSearcherExecutorThreads = -1* in the Solr configuration. *On the client side:* Set the *multiThreaded = true* parameter. We noticed significant performance degradation when this was not enabled. We would like to check if there are any plans to deprecate or remove the experimental multiThreaded parameter in future releases, as it currently plays a critical role in maintaining our performance benchmarks. Please keep us informed of any relevant updates or changes. Thanks, Sarita
