rahulgoswami commented on code in PR #4195: URL: https://github.com/apache/solr/pull/4195#discussion_r2972830093
########## solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-10.adoc: ########## @@ -285,3 +285,15 @@ Attention: * The `llm` module has been renamed to `language-models`. * The HNSW parameters `hnswMaxConnections` and `hnswBeamWidth` have been renamed to `hnswM` and `hnswEfConstruction`, respectively, so they must be updated accordingly in the schema.xml file. + +== Solr 10.1 + +=== Lucene Codec Change + +Solr 10.1 upgrades the underlying Lucene library from 10.3 to 10.4, which introduces a new index codec (`Lucene104`). +New index segments will be written using the `Lucene104` codec format. +Existing segments written with older codecs (e.g. `Lucene103`) will continue to be readable. + +WARNING: After upgrading to Solr 10.1, downgrading to an earlier Solr 10.0.x version may fail because the older version does not include the `Lucene104` codec needed to read the newly written segments. +If you require the ability to roll back, back up your indexes before upgrading. +A full reindex would be needed to downgrade after new segments have been written in Solr 10.1. Review Comment: I meant to communicate that IF there is no backup and you need to downgrade, a full reindex from source would be needed. Agree the missing "if no backup" pretext makes the sentence confusing. Will fix. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
