On 5/9/2018 1:51 PM, Andy C wrote: > According to the 7.3 release notes I should be using Zookeeper 3.4.11 with > Solr 7.3.
The release notes don't make any specific recommendation about the version of ZK that you should use for your server. The information in the release notes that mentions 3.4.11 is only talking about which version of ZK is included inside Solr. Typically you should use the latest stable release for your servers, or possibly the latest release in the same minor version as the client. > However it appears that Zookeeper has pulled Zookeeper 3.4.11 from their > mirror sites (this appears to be due to a serious bug in ZK 3.4.11 - > ZOOKEEPER-2960) <https://issues.apache.org/jira/browse/ZOOKEEPER-2960> . > Only 3.4.10 and 3.4.12 are available. > > Not quite sure how to proceed. Can I use ZK 3.4.10 or 3.4.12 with Solr 7.3? > Or should I try to find an archived version of ZK 3.4.11 somewhere? Use 3.4.12. And if a newer 3.4.x version gets released, consider upgrading your ZK servers. All 3.4.x clients SHOULD work with all 3.4.x versions of the server, and would probably also work with 3.5.x servers (which are alpha and beta at this time, not stable). You can still download 3.4.11 if you REALLY want to, from the Apache archive: https://archive.apache.org/dist/zookeeper/ 7.3.1 is still using ZK 3.4.11. At this time, ZK isn't upgraded in the stable branch that will eventually be 7.4. That might happen before 7.4 is released, but I can't be sure. The only time the bug in 3.4.11 would matter for Solr itself is when using the embedded zookeeper -- which we do NOT recommend using in production. The incorrect directories should not actually cause any problem for the embedded ZK unless an upgrade is attempted while keeping the same ZK data. The files would need to be moved or the embedded ZK reconfigured before a newer version could successfully find them. Thanks, Shawn
