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https://issues.apache.org/jira/browse/SOLR-12823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17110592#comment-17110592
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Ilan Ginzburg commented on SOLR-12823:
--------------------------------------

[~dsmiley] SOLR-13942 might have been reverted since, I don't see ZkRead.java 
on master.

Also, it did not provide the same service as /admin/zookeeper that's used by 
the Admin UI.

It implemented a recursive dump of the ZK tree below a path. /admin/zookeeper 
returns what's needed to display the collection list + config and supports 
filtering and paging.

> remove clusterstate.json in Lucene/Solr 8.0
> -------------------------------------------
>
>                 Key: SOLR-12823
>                 URL: https://issues.apache.org/jira/browse/SOLR-12823
>             Project: Solr
>          Issue Type: Task
>            Reporter: Varun Thacker
>            Priority: Major
>
> clusterstate.json is an artifact of a pre 5.0 Solr release. We should remove 
> that in 8.0
> It stays empty unless you explicitly ask to create the collection with the 
> old "stateFormat" and there is no reason for one to create a collection with 
> the old stateFormat.
> We should also remove the "stateFormat" argument in create collection
> We should also remove MIGRATESTATEVERSION as well
>  
>  



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