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https://issues.apache.org/jira/browse/SOLR-8561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15104972#comment-15104972
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Adrien Grand commented on SOLR-8561:
------------------------------------

Thank you Varun!

> Add fallback to ZkController.getLeaderProps for a mixed 5.4-pre-5.4 
> deployments
> -------------------------------------------------------------------------------
>
>                 Key: SOLR-8561
>                 URL: https://issues.apache.org/jira/browse/SOLR-8561
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>            Reporter: Shai Erera
>            Assignee: Shai Erera
>         Attachments: SOLR-8561.patch, SOLR-8561.patch
>
>
> See last comments in SOLR-7844. The latter changed the structure of the 
> leader path in ZK such that upgrading from pre-5.4 to 5.4 is impossible, 
> unless all nodes are taken down. This issue adds a fallback logic to look for 
> the leader properties on the old ZK node, as discussed.



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