Hi, I apologize for connecting to this thread but I'm interested in this topic as well. I think we have a similar configuration: solr 4.8, standard master/slave replication, data is indexed on master and then replicated to slave. I'm investigating how to migrate to solr 5.*. Erick, you say that there is a full backward compatibility between 4.* and 5.* so, for example, we could migrate the slave (and it will continue to read old indexes), then migrate the master (and it could could even update old indexes without need for full reindex). It seems too simple... and I hope it will be so, but my experience of migrations is not so painless as you say...(I'm not referring to SOLR) Is there anyone who tried this approach on a production environment? What I should be more careful of? Is there any incompatibility in REST calls and responses? Thank you
Il giorno mar 26 gen 2016 alle ore 18:31 Erick Erickson < erickerick...@gmail.com> ha scritto: > Yes and Yes. The developers try very hard to make Solr > one major release backwards compatible. So 5x should be > able to read 4x just fine. > > Nothing has really changed in replication, so 5x supports > master/slave. It's just becoming less popular as SolrCloud > is significantly easier to operationalize. > > Note that as segments get written they will be transformed from 4x > format to 5x. And you can also use the index upgrade tool here: > > https://lucene.apache.org/core/5_0_0/core/org/apache/lucene/index/IndexUpgrader.html > > to transform your 4x to 5x > > Best, > Erick > > On Tue, Jan 26, 2016 at 7:51 AM, Midas A <test.mi...@gmail.com> wrote: > > I want migrate from solr 4.2.1 to 5.X version hten my question is > > > > - can i use same snapshot of 4.2.1 in 5.x.x > > > > Actually Indexing will take long time in my case then it would be > possible > > to do > > or we should not do this. > > > > > > next similar question is > > > > - can we replicate 4.2.1 master to slave 5.x.x solr >
