I recently upgraded from 4.x to 5.5 -- it was a pain to figure it out, but it turns out to be fairly straightforward...
Caveat: Because I run all my data into Kafka first, I was able to easily re-create my collections by running a microservice that pulls from Kafka and dumps into Solr. I have a rough draft document for how to "upgrade by replacement" in this way - basically, throw away the older Solr, build a new /chroot in Zookeeper and issue a few command line commands to upload configs (from the 4.x version) and create new collections in the 5.x version. If this is what you mean by "bootstrap" (Upgrade to 5.x but use your index/collection/core from a previous version) then perhaps I can help. There were instructions on the Solr wiki for the differences between 4.x and 5.x... But before I go into a lot more detail, please drop us a line and let me know if that's what you need... For reference you can look at this, but I have more refined instructions now: http://stackoverflow.com/questions/34909909/how-to-correctly-add-additional-solr-5-vm-nodes-to-solr-cloud?rq=1 On Wed, Apr 6, 2016 at 7:01 AM, Shawn Heisey <apa...@elyograg.org> wrote: > On 4/5/2016 3:08 PM, Anuj Lal wrote: > > I am new to solr. Need some advice from more experienced solr team > members > > > > I am upgrading 4.4 solr cluster to 5.5 > > > > One of the step I am doing for upgrade is to bootstrap from existing 4.4 > solr home ( after upgrading solr installation to 5.5) > > We'll need a lot more detail about *exactly* what "bootstrap" means > here. The fact that you chose the word "bootstrap" to describe your > process sets off a red flag in my mind, and might mean that you're doing > this upgrade in a way that won't work like you're expecting it to. > > One particular question I'd like to have answered: Are you upgrading > each server in place using the exact same zkHost string as the 4.4 > install was using, or are you trying to build up a new ZK > chroot/database using the existing Solr home? > > I have not actually performed one of these SolrCloud upgrades, but I > would expect that if you don't connect to the existing zookeeper > database, it would probably behave exactly like you've described. If > I'm completely wrong about how this should be done, somebody please let > me know. > > Going from 4.4 to 5.5 is a significant upgrade (including one major > release, 10 minor releases, and 10 bugfix releases) and you might find > that the two versions won't coexist very well. The devs do try to make > different versions compatible, but SolrCloud is evolving at an extremely > rapid pace, so this cannot be guaranteed when the version difference is > so large. > > Assuming I have a correct mental picture of how you got to where you > are, there might be some things you could do to get it back on track, > but that would require significant manual fiddling, and no guarantee of > success. > > Thanks, > Shawn > >
