Hi, It's fairly well described in the reference guide https://solr.apache.org/guide/solr/latest/upgrade-notes/major-changes-in-solr-9.html
Normally we recommend not to "upgrade" your existing nodes on a major upgrade, but instead stand up a clean new 9.x cluster/server and do a full re-index. It could, given certain conditions, be possible to do an in-place / rolling upgrade of an 8.11 cluster to 9.x while keeping the index, but it only works if your 8.x index was first created with Solr 8, and there are some gotchas detailed in the upgrade notes. I'd go with a fresh install. And of course simulate the upgrade locally, then in a test environment etc. Feel free to ask more specific questions once you have decided on your strategy. Jan > 19. mars 2025 kl. 00:53 skrev AlvaradoAlonso, Francisco > <francisco.alvaradoalo...@gulfstream.com.INVALID>: > > Hello, > > Does anyone have the specific steps to upgrade from Solr 8.11 to 9.x? I've > seen that part of the process is extracting the new tgz/zip file into a new > location and copying over the configuration files and data files from current > 8.11 version, but I haven't found any official tutorial with these steps. > > We currently have the On-Prem version in some of our servers, one of them > with a single instance and the others are using leader/follower configuration. > > Thank you! > > Regards, > > Francisco Javier Alvarado Alonso > JAVA Apps Dev Sr - BT West > Gulfstream Aerospace > Mexicali, Baja California 21376 > Work Cellphone: +52 686 221 8824 > > This e-mail message, including all attachments, is for the sole use of the > intended recipient(s) and may contain Personal Information under General > Dynamics policy CP 07-105 and/or legally privileged and confidential > information. Any Personal Information can be accessed only by authorized > personnel of General Dynamics and its approved service providers and may be > used only as permitted by General Dynamics and its policies. Contractual > restrictions apply to third parties. If you are not an intended recipient, > you are hereby notified that you have either received this message in error > or through interception, and that any review, use, distribution, copying or > disclosure of this message or its attachments is strictly prohibited and is > subject to criminal and civil penalties. All personal messages express solely > the sender's views and not those of Gulfstream Aerospace Corporation. If you > received this message in error, please contact the sender by reply e-mail and > destroy all copies of the original message.
