sigram commented on a change in pull request #2179:
URL: https://github.com/apache/lucene-solr/pull/2179#discussion_r552527986



##########
File path: 
solr/core/src/java/org/apache/solr/cluster/placement/plugins/AffinityPlacementFactory.java
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@@ -193,6 +195,22 @@ public PlacementPlan computePlacement(Cluster cluster, 
PlacementRequest request,
       Set<Node> nodes = request.getTargetNodes();
       SolrCollection solrCollection = request.getCollection();
 
+      final SolrCollection secondaryCollection;
+      String withCollection = 
solrCollection.getCustomProperty(CollectionAdminParams.WITH_COLLECTION);

Review comment:
       I think that we should probably completely disallow using aliases in 
this context... how would that work in practice? if you flip the alias that 
used to point to the secondary collection to some other collection then 
suddenly the co-location may be completely broken.




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