Hi, following up on Charlie's detailed response I would recommend carefully assess the code you are using to interact with Apache Solr (on top of the Solr changes themselves). Assuming you are using some sort of client, it's extremely important to fully understand both the syntax and semantic of each call. I saw a lot of "compiling ok" search-api migrations that were ok syntactically but doing a disaster from the semantic perspective (missing important parameters ect).
In case you have plugins to maintain this would be even more complicated than just make them compile. Regards -------------------------- Alessandro Benedetti Apache Lucene/Solr Committer Director, R&D Software Engineer, Search Consultant www.sease.io On Tue, 9 Feb 2021 at 11:01, Charlie Hull <ch...@opensourceconnections.com> wrote: > Hi Lulu, > > I'm afraid you're going to have to recognise that Solr 5.2.1 is very > out-of-date and the changes between this version and the current 8.x > releases are significant. A direct jump is I think the only sensible > option. > > Although you could take the current configuration and attempt to upgrade > it to work with 8.x, I recommend that you should take the chance to look > at your whole infrastructure (from data ingestion through to query > construction) and consider what needs upgrading/redesigning for both > performance and future-proofing. You shouldn't just attempt a > lift-and-shift of the current setup - some things just won't work and > some may lock you into future issues. If you're running at large scale > (I've talked to some people at the BL before and I know you have some > huge indexes there!) then a redesign may be necessary for scalability > reasons (cost and feasibility). You should also consider your skills > base and how the team can stay up to date with Solr changes and modern > search practice. > > Hope this helps - this is a common situation which I've seen many times > before, you're certainly not the oldest version of Solr running I've > seen recently either! > > best > > Charlie > > On 09/02/2021 01:14, Paul, Lulu wrote: > > Hi SOLR team, > > > > Please may I ask for advice regarding upgrading the SOLR version (our > project currently running on solr-5.2.1) to the latest version? > > What are the steps, breaking changes and potential issues ? Could this > be done as an incremental version upgrade or a direct jump to the newest > version? > > > > Much appreciate the advice, Thank you! > > > > Best Wishes > > Lulu > > > > > > > ****************************************************************************************************************** > > Experience the British Library online at www.bl.uk<http://www.bl.uk/> > > The British Library's latest Annual Report and Accounts : > www.bl.uk/aboutus/annrep/index.html< > http://www.bl.uk/aboutus/annrep/index.html> > > Help the British Library conserve the world's knowledge. Adopt a Book. > www.bl.uk/adoptabook<http://www.bl.uk/adoptabook> > > The Library's St Pancras site is WiFi - enabled > > > ***************************************************************************************************************** > > The information contained in this e-mail is confidential and may be > legally privileged. It is intended for the addressee(s) only. If you are > not the intended recipient, please delete this e-mail and notify the > postmas...@bl.uk<mailto:postmas...@bl.uk> : The contents of this e-mail > must not be disclosed or copied without the sender's consent. > > The statements and opinions expressed in this message are those of the > author and do not necessarily reflect those of the British Library. The > British Library does not take any responsibility for the views of the > author. > > > ***************************************************************************************************************** > > Think before you print > > > > -- > Charlie Hull - Managing Consultant at OpenSource Connections Limited > <www.o19s.com> > Founding member of The Search Network <https://thesearchnetwork.com/> > and co-author of Searching the Enterprise > <https://opensourceconnections.com/about-us/books-resources/> > tel/fax: +44 (0)8700 118334 > mobile: +44 (0)7767 825828 >
