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
