As of Solr 8.2, Solr is distributed with ZooKeeper 3.5.5 (will be 3.5.7 in Solr 8.6), which allows “dynamic reconfiguration”. If you’re running an earlier version of Zookeeper, then no you’ll have to restart to change ZK nodes.
WARNING: I have not personally tried dynamic reconfiguration with Solr, so I don’t have any advice on exactly how to make that work or any “gotchas”… Best, Erick > On Mar 23, 2020, at 5:42 AM, Bram Van Dam <[email protected]> wrote: > > Is it possible to change the ZK ensemble without restarting the entire > SolrCloud? Specifically adding or removing a ZK instance from the > ensemble. I'm assuming the answer is no, as far as I can tell the only > place where this is configured is the zkHost parameter, which is passed > to Solr as a JVM argument. > > But I figured I'd ask anyway. Thanks for any insights! > > - Bram
