Solr/Lucene are supposed to _always_ read one major version back. Thus your 4.10 should be able to read indexes produced all the way back to (and including) 3.x. Sometimes "experimental" formats are excepted.
In your case you should be fine since you're upgrading from 4.8.. As always, though, I'd recommend copying your indexes someplace just to be paranoid before upgrading. Best, Erick On Fri, Apr 17, 2015 at 10:28 AM, Vincenzo D'Amore <v.dam...@gmail.com> wrote: > Thanks for your answers, I looked at changes and we don't use > DocValuesFormat. > The question is, if I upgrade the SolrCloud version to 4.10, should I > reload entirely all documents? > Is there a binary compatibility between these two versions reading the > solar home? > > On Fri, Apr 17, 2015 at 7:04 PM, Erick Erickson <erickerick...@gmail.com> > wrote: > >> Look at CHANGES.txt for both Lucene and Solr, there's always an >> "upgrading" section for each release. >> >> Best, >> Erick >> >> On Fri, Apr 17, 2015 at 5:31 AM, Toke Eskildsen <t...@statsbiblioteket.dk> >> wrote: >> > Vincenzo D'Amore <v.dam...@gmail.com> wrote: >> >> I have a SolrCloud cluster with 3 server, I would like to use >> stats.facet, >> >> but this feature is available only if I upgrade to 4.10. >> > >> >> May I simply redeploy new solr cloud version in tomcat or should reload >> all >> >> the documents? >> >> There are other drawbacks? >> > >> > Support for the Disk-format for DocValues was removed after 4.8, so you >> should check if you use that: DocValuesFormat="Disk" for the field in the >> schema, if I remember correctly. >> > >> > - Toke Eskildsen >> > > > > -- > Vincenzo D'Amore > email: v.dam...@gmail.com > skype: free.dev > mobile: +39 349 8513251
