AMashenkov commented on a change in pull request #336:
URL: https://github.com/apache/ignite-3/pull/336#discussion_r714593956



##########
File path: 
modules/configuration/src/main/java/org/apache/ignite/internal/configuration/ConfigurationNode.java
##########
@@ -17,24 +17,27 @@
 
 package org.apache.ignite.internal.configuration;
 
-import java.util.Collections;
+import java.util.Collection;
 import java.util.List;
 import java.util.NoSuchElementException;
 import java.util.Objects;
-import java.util.concurrent.CopyOnWriteArrayList;
+import org.apache.ignite.configuration.ConfigurationListenOnlyException;
 import org.apache.ignite.configuration.ConfigurationProperty;
 import org.apache.ignite.configuration.RootKey;
 import org.apache.ignite.configuration.notifications.ConfigurationListener;
 import org.apache.ignite.internal.configuration.tree.TraversableTreeNode;
 import org.apache.ignite.internal.configuration.util.ConfigurationUtil;
 import org.apache.ignite.internal.configuration.util.KeyNotFoundException;
 
+import static java.util.Collections.unmodifiableCollection;
+import static java.util.concurrent.ConcurrentHashMap.newKeySet;
+
 /**
  * Super class for dynamic configuration tree nodes. Has all common data and 
value retrieving algorithm in it.
  */
 public abstract class ConfigurationNode<VIEW, CHANGE> implements 
ConfigurationProperty<VIEW, CHANGE> {
     /** Listeners of property update. */
-    protected final List<ConfigurationListener<VIEW>> updateListeners = new 
CopyOnWriteArrayList<>();
+    protected final Collection<ConfigurationListener<VIEW>> updateListeners = 
newKeySet();

Review comment:
       ```suggestion
       protected final Collection<ConfigurationListener<VIEW>> updateListeners 
= ConcurrentHashMap.newKeySet();
   ```




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