bq. You will have to migrate your indexes from 4 to 5, then 5 to 6, and finally 6 to 7.
This actually has never been guaranteed. Lucene has guaranteed back-compat for 1 major version. Using the IndexUpgrader tool will rewrite the X-1 format in version X format, but cannot synthesize data from thin air. So starting with X-2 -> X-1 -> X hasn't failed to run, it just hasn't necessarily worked like an index that was created entirely with version X. This has been formalized starting with Lucene 6. A marker has been written in each segment that is preserved across all merges and will refuse to open indexes with a marker from X-2. If you merge two segments, one created with X-1 and one created with X, the X-1 marker is preserved. If you try to use Solr 8 on an index that has segments that have _ever_ been touched by Lucene 6, Lucene will refuse to open the index. And anyway, the IndexUpgraderTool just optimizes down to 1 segment, which has its own problems. It's best to plan on re-indexing into a fresh collection... Best, Erick On Tue, Dec 11, 2018 at 9:30 AM Emmanuel Keller <[email protected]> wrote: > > About the migration strategy, you may have to choose between reindexing all > the data or migrating your current indexes. > > the IndexUpgrader tool will be able to handle that. > You will have to migrate your indexes from 4 to 5, then 5 to 6, and finally > 6 to 7. > https://lucene.apache.org/solr/guide/7_6/indexupgrader-tool.html > > If you still have your original data, then the reindexing option is better. > And even more if you plan to use the new field options available, which means > changing the schema. > > If it can help :D > > > > On 11 Dec 2018, at 17:08, Cassandra Targett <[email protected]> wrote: > > The Solr Ref Guide also has extensive sections (particularly for upgrading to > Solr 6 and 7) describing summarizing major changes for various releases. > Start at https://lucene.apache.org/solr/guide/solr-upgrade-notes.html and > note the child pages from there. > > Cassandra > On Dec 11, 2018, 10:30 AM -0600, Erick Erickson <[email protected]>, > wrote: > > The CHANGES.txt file in both the Solr and Lucene directories have a > section listing the differences between every Solr version, major and > minor that you could review. The reference guide has an upgrade > section as well that will be informative. > > That said, there are many changes. Lot and lots and lots. What I'd do > is plan on starting with a fresh Solr 7x setup, migrate your > configurations (as in make similar changes in the 7x configs, do not > just copy/paste). and start testing after indexing fresh. You haven't > said whether you have any custom code and the like, so that is an > unknown. > > Best, > Erick > On Tue, Dec 11, 2018 at 6:28 AM hello hello <[email protected]> wrote: > > > Bonjour , > > I am a project manager at La Poste française , I am managing a national > project using SORL 4.9 and I want to migrate to SOLR 7 . > Can you give me a summary of all the spots that need to be done to make this > migration? Thank oyu your for help Fred > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
