On 12/7/2017 6:55 AM, Gilcan Machado wrote: > I have a Solr 4 in production (+ Drupal). > > And I want to migrate Solr to versoin 7 (at the end). > > But I guess it's more safe to migrate from 4 to 5 first. > > Anyway, I'm searching a lot and I couldn't find a documentation that shows > how to pick a Solr 4 (in full production) and upgrade to a Solr 5.
The approach that I personally would use for this scenario is to create a new config/schema for 7.x (either based on the 7.x examples, or received from whoever wrote the Solr plugin for Drupal), upgrade directly to the final version, and reindex from scratch into a fresh index. Compared to version 4, version 7 is a VERY significant upgrade, and it is likely that at some point in the 4>5>6>7 upgrade process that you're going to want to change something that's going to require a reindex anyway. There's even a good chance that you'll be FORCED to do a reindex, because something in your config/schema might not work in a newer version. Whether you're forced into a reindex would depend on how your indexes are configured. In three major versions, a lot of older functionality gets removed, so many 4.x configs will not work in 7.x. Many of the changes that are required to successfully upgrade are NOT compatible with an existing index. I have never used Drupal, but their Solr plugin probably has an option to reindex the entire database for situations where the old index is missing or doesn't have the right info in it. Thanks, Shawn
