[GitHub] QiuMM commented on a change in pull request #6898: Prohibit assigning concurrent maps into Map-typed variables and fields and fix a race condition in CoordinatorRuleManager

[GitBox <gi...@apache.org>]

QiuMM commented on a change in pull request #6898: Prohibit assigning concurrent maps into Map-typed variables and fields and fix a race condition in CoordinatorRuleManager
URL: https://github.com/apache/incubator-druid/pull/6898#discussion_r249658722
 
 

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 File path: server/src/main/java/org/apache/druid/curator/discovery/CuratorDruidNodeDiscoveryProvider.java
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 @@ -67,7 +67,7 @@
 
   private ExecutorService listenerExecutor;
 
-  private final Map<NodeType, NodeTypeWatcher> nodeTypeWatchers = new ConcurrentHashMap<>();
+  private final ConcurrentHashMap<NodeType, NodeTypeWatcher> nodeTypeWatchers = new ConcurrentHashMap<>();
 
 Review comment:
   Same, change `ConcurrentHashMap` to `ConcurrentMap`.

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