Thanks for a detailed and clear answer. wunder Walter Underwood wun...@wunderwood.org http://observer.wunderwood.org/ (my blog)
> On May 23, 2018, at 8:20 AM, Shawn Heisey <apa...@elyograg.org> wrote: > > On 5/22/2018 10:44 AM, Walter Underwood wrote: >> Is anybody running Zookeeper 3.4.12 with Solr 6.6.2? Is that a recommended >> combination? Not recommended? > > Solr 6.6.2 shipped with ZK 3.4.10, which the ZK project released > 2017-Mar-30. > > I asked the zk mailing list about any gotchas they're aware of when > running mismatched versions, assuming the server is running a newer > version than the client. They replied with a document discussing their > backward compatibility goals (scroll to the end): > > https://cwiki.apache.org/confluence/display/ZOOKEEPER/ReleaseManagement > > Solr 4.0.0 (the first stable version with Cloud mode) shipped with ZK > 3.3.6. In 4.1.0, that was upgraded to ZK 3.4.5. Solr 7.4.0 will most > likely ship with ZK 3.4.12. (SOLR-12346) > > ALL versions of SolrCloud should work with 3.4.12 on the ZK server side. > > If you upgrade your ZK servers to the 3.5 beta, then no guarantees can > be made for Solr 4.0, but 4.1 and later should work. > > Thanks, > Shawn >
