We have been doing exactly that through several versions of Solr: we unpack the new version on one set of replicas, install empty directories for the core(s) we want to use, and create empty core.properties files in these. Then, we start the new replicas, using a (stand-alone) zookeeper for the configuration/synchronization management.
So yes, it is possible. On 01 Dec 2013, at 13:21 , adfel70 <adfe...@gmail.com> wrote: > I was wondering if there is a way to upgrade Solr version without downtime. > Theoretically it seems possible when every shard in the cluster has at least > 2 replicas - but Jetty does not refresh the web container until we delete > solr-webapp folder's content. > Can someone please share from his experience? > > > > -- > View this message in context: > http://lucene.472066.n3.nabble.com/Upgrading-Solr-cluster-without-downtime-tp4104223.html > Sent from the Solr - User mailing list archive at Nabble.com.
