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 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?
>
>
>
> --
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