chatman commented on a change in pull request #1758:
URL: https://github.com/apache/lucene-solr/pull/1758#discussion_r473802780
##########
File path:
solr/core/src/java/org/apache/solr/cluster/events/ClusterSingleton.java
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@@ -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:
@sigram So long as concept of "triggers" is not a first class citizen in
solr-core, I'm +1 to the idea.
My understanding was that the autoscaling framework will introduce the
concept of "triggers" (with no traces in solr-core) and that framework will
also have first party trigger impls. Third party triggers can plug into the
framework as dependent packages.
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