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https://issues.apache.org/jira/browse/SOLR-8346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16888877#comment-16888877
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Shawn Heisey commented on SOLR-8346:
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[~michelwigbers] This issue is about upgrading the ZK clent code built into
Solr to 3.5.x. You're running a Solr version with the 3.4.x client against
3.5.x servers.
The most likely reason for the exception you're seeing is that your ZK servers
are not allowing Solr to use "four letter word" commands. The 3.5.x version of
the ZK server disallows all 4lw commands by default. You will need this in
your ZK server config:
4lw.commands.whitelist=mntr,conf,ruok
> Upgrade Zookeeper to version 3.5.5
> ----------------------------------
>
> Key: SOLR-8346
> URL: https://issues.apache.org/jira/browse/SOLR-8346
> Project: Solr
> Issue Type: Task
> Components: SolrCloud
> Reporter: Jan Høydahl
> Assignee: Shawn Heisey
> Priority: Major
> Labels: security, zookeeper
> Fix For: master (9.0), 8.2
>
> Attachments: SOLR-8346.patch, SOLR-8346.patch, SOLR-8346.patch,
> SOLR-8346.patch, SOLR-8346.patch, SOLR_8346.patch
>
>
> Investigate upgrading ZooKeeper to 3.5.x, once released. Primary motivation
> for this is SSL support. --Currently a 3.5.4-beta is released (2018-05-17).--
> Version 3.5.5 was released 2019-05-20
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