murblanc opened a new pull request #1528:
URL: https://github.com/apache/lucene-solr/pull/1528


   Remove all code dealing with Zookeeper's /clusterstate.json, remove 
Collection API's MIGRATESTATEVERSION, remove legacyCloud option.
   
   Notes:
   - org.apache.solr.cloud.autoscaling.sim is non functional, requires more 
work.
   - TestZkChroot requires more work
   - BasicZkTest requires more work (or better: be deleted)
   
   Also fixes SOLR-11877: DocCollection.getStateFormat is buggy
   
   # Description
   
   Remove all code dealing with /clusterstate.json in Zookeeper, remove 
MIGRATESTATEVERSION Collection API action and the notion of “legacyCloud”.
   
   Note this is a draft PR at this stage, need to fix the autoscale sim before 
it can be merged.
   
   # Solution
   
   Solr 9 will refuse to start if an existing /clusterstate.json in Zookeeper 
exists and is not empty.
   
   # Tests
   
   No new tests, but adapting old tests that were misbehaving.
   
   # Checklist
   
   Please review the following and check all that apply:
   
   - [X] I have reviewed the guidelines for [How to 
Contribute](https://wiki.apache.org/solr/HowToContribute) and my code conforms 
to the standards described there to the best of my ability.
   - [X] I have created a Jira issue and added the issue ID to my pull request 
title.
   - [X] I have given Solr maintainers 
[access](https://help.github.com/en/articles/allowing-changes-to-a-pull-request-branch-created-from-a-fork)
 to contribute to my PR branch. (optional but recommended)
   - [X] I have developed this patch against the `master` branch.
   - [X] I have run `ant precommit` and the appropriate test suite.
   - [ ] I have added tests for my changes.
   - [X] I have added documentation for the [Ref 
Guide](https://github.com/apache/lucene-solr/tree/master/solr/solr-ref-guide) 
(for Solr changes only).
   


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