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
