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From Bram Van Dam <>
Subject Re: ZooKeeper 3.4 end of life
Date Thu, 09 Apr 2020 14:03:24 GMT
Thanks, Erick. I'll give it a go this weekend and see how it behaves.
I'll report back so there's a record of my attempts in case anyone else
ends up asking the same question.

Some of our customers get a bit nervous when software goes out of
support, even if it works fine, so I try to be prepared ;-)

On 09/04/2020 13:50, Erick Erickson wrote:
> All it means is that there won’t be upgrades/improvements to
> ZK, 3.4 will still run. So there’s no need to move to 3.5 independent 
> of upgrading Solr just because that version of ZK is unsupported
> going forward.
> I haven’t personally tried to run 3.5 against an earlier version, but
> one thing you’ll probably want to do if you try it is whitelist
> “ruok”, “mntr”, and “conf” in your Zookeeper config, see the 
> Zookeeper documentation. NOTE: that is only necessary if you 
> want to see the Zookeeper status in the admin UI, those
> commands aren’t used by anything else in Solr.
> The JIRA (SOLR-8346) contains a _ton_ of changes, but the mostly
> fall in two categories: Using a file rather than strings in tests and
> trying to handle the whitelist programmatically, neither of which
> are relevant to just dropping a newer version of ZK in.

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