murblanc commented on a change in pull request #2199:
URL: https://github.com/apache/lucene-solr/pull/2199#discussion_r559742269



##########
File path: 
solr/core/src/java/org/apache/solr/cloud/api/collections/DeleteCollectionCmd.java
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@@ -92,6 +98,19 @@ public void call(ClusterState state, ZkNodeProps message, 
@SuppressWarnings({"ra
       collection = extCollection;
     }
 
+    PlacementPlugin placementPlugin = 
ocmh.overseer.getCoreContainer().getPlacementPluginFactory().createPluginInstance();

Review comment:
       Didn't dig into the details here, but when we delete a collection, we 
should just check if there's another collection that defines `withCollection` 
on it and refuse the delete based on that, no?
   Just starting to look at the PR so maybe there's a reason for doing it this 
way (in which case maybe adding a comment?)




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