chatman commented on a change in pull request #1758:
URL: https://github.com/apache/lucene-solr/pull/1758#discussion_r472948399



##########
File path: 
solr/core/src/java/org/apache/solr/cluster/events/ClusterSingleton.java
##########
@@ -0,0 +1,14 @@
+package org.apache.solr.cluster.events;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Intended for {@link org.apache.solr.core.CoreContainer} plugins that should 
be
+ * enabled only one instance per cluster.
+ * <p>Implementation detail: currently these plugins are instantiated on the
+ * Overseer leader, and closed when the current node loses its leadership.</p>
+ */
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ClusterSingleton {

Review comment:
       I think you're totally misunderstanding what I'm saying here.
   
   > I'd rather have such code be in lucene-solr and not be loaded when not in 
use,
   
   I'm not opposed to such code staying in official Solr repository. Even the 
autoscaling framework will be there. But, I am opposed to having such 
coordination in "solr-core" module of the repository. It should be a separate 
package/jar, that depends on "solr-core".




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