sigram commented on a change in pull request #2101:
URL: https://github.com/apache/lucene-solr/pull/2101#discussion_r535527148



##########
File path: 
solr/core/src/java/org/apache/solr/cluster/events/impl/ClusterEventProducerFactory.java
##########
@@ -149,21 +153,25 @@ public void deleted(ContainerPluginsRegistry.ApiInfo 
plugin) {
           ClusterEventListener listener = (ClusterEventListener) instance;
           clusterEventProducer.unregisterListener(listener);
         } else if (instance instanceof ClusterEventProducer) {
-          // replace the existing impl with NoOp
-          if (cc.getClusterEventProducer() instanceof 
DelegatingClusterEventProducer) {
-            ((DelegatingClusterEventProducer) cc.getClusterEventProducer())
-                .setDelegate(new NoOpProducer(cc));
+          if (ClusterEventProducer.PLUGIN_NAME.equals(plugin.getInfo().name)) {

Review comment:
       I debated whether to do it in this PR or separately... strictly speaking 
it's not a part of this PR, but I refactored a similar pattern in a listener 
that belongs to this PR ... so maybe I'll do it here :)




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