On 11/24/2016 3:12 AM, Novin Novin wrote: > I found in solr docs that "Solr currently uses Apache ZooKeeper > v3.4.6". Can I use higher version or I have to use 3.4.6 zookeeper.
Solr should be fine working with zookeeper servers running any 3.4.x version. I believe 3.4.9 is the highest stable version currently available. It looks like Zookeeper does not follow the same release philosophy that Solr does. In Solr, changes in the third version number are bugfix-only releases. Zookeeper does appear to add new features when the third version number changes. They haven't had a minor release in quite a while, but Solr makes minor releases frequently. So far, there are only alpha releases of Zookeeper version 3.5. One of the big features in that version is the ability to dynamically change the zookeeper cluster by adding or removing servers. I have no idea whether current Solr versions will work out of the box with a 3.5 server cluster ... but even if it does work, it won't handle the new dynamic membership feature. Some time after Zookeeper releases a stable 3.5 version, Solr will be updated to use it. Thanks, Shawn
