[jira] [Reopened] (SOLR-13502) Investigate using something other than ZooKeeper's "4 letter words" for the admin UI status

["Jan Høydahl (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-13502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jan Høydahl reopened SOLR-13502:
--------------------------------
      Assignee:     (was: Erick Erickson)

I'm re-opening this, as I believe it is something that should be done, but it is not very urgent until people start migrating their ZKs to NIO transport with SSL, and disabling the old ports with 4lw. AdminServer is probably going to see more improvement and perhaps support in zk Java client? so hopefully implementing support for it will be easier in a future version of ZK.

> Investigate using something other than ZooKeeper's "4 letter words" for the admin UI status
> -------------------------------------------------------------------------------------------
>
>                 Key: SOLR-13502
>                 URL: https://issues.apache.org/jira/browse/SOLR-13502
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Erick Erickson
>            Priority: Major
>
> ZooKeeper 3.5.5 requires a whitelist of allowed "4 letter words". The only place I see on a quick look at the Solr code where 4lws are used is in the admin UI "ZK Status" link.
> In order to use the admin UI "ZK Status" link, users will have to modify their zoo.cfg file with
> {code}
> 4lw.commands.whitelist=mntr,conf,ruok
> {code}
> This JIRA is to see if there are alternatives to using 4lw for the admin UI.
> This depends on SOLR-8346. If we find an alternative, we need to remove the additions to the ref guide that mention changing zoo.cfg (just scan for 4lw in all the .adoc files) and remove SolrZkServer.ZK_WHITELIST_PROPERTY and all references to it (SolrZkServer and SolrTestCaseJ4).



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