murblanc commented on a change in pull request #2101:
URL: https://github.com/apache/lucene-solr/pull/2101#discussion_r536274851



##########
File path: 
solr/core/src/java/org/apache/solr/cluster/placement/plugins/MinimizeCoresPlacementFactory.java
##########
@@ -40,13 +40,23 @@
  *
  * <p>See {@link AffinityPlacementFactory} for a more realistic example and 
documentation.</p>
  */
-public class MinimizeCoresPlacementFactory implements PlacementPluginFactory {
+public class MinimizeCoresPlacementFactory implements 
PlacementPluginFactory<PlacementPluginFactory.NoConfig> {
 
   @Override
-  public PlacementPlugin createPluginInstance(PlacementPluginConfig config) {
+  public PlacementPlugin createPluginInstance() {
     return new MinimizeCoresPlacementPlugin();
   }
 
+  @Override
+  public void configure(NoConfig cfg) {
+    // no-op
+  }
+
+  @Override
+  public NoConfig getConfig() {

Review comment:
       Maybe similarly here, `PlacementPluginFactory` should provide a default 
implementation returning `NoConfig.INSTANCE` given that out of 4 
implementations of the interface, only one returns something else 
(`AffinityPlacementFactory`).




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