jihoonson commented on a change in pull request #9302: Not use for 
CoordinatorRuleManager.rules
URL: https://github.com/apache/druid/pull/9302#discussion_r375092308
 
 

 ##########
 File path: 
server/src/main/java/org/apache/druid/server/router/CoordinatorRuleManager.java
 ##########
 @@ -58,7 +57,7 @@
   private final ObjectMapper jsonMapper;
   private final Supplier<TieredBrokerConfig> config;
 
-  private final AtomicReference<ConcurrentHashMap<String, List<Rule>>> rules;
+  private final AtomicReference<Map<String, List<Rule>>> rules;
 
 Review comment:
   @zhenxiao would you consider @suneet-s's comment above? I think it would be 
nice to have. If you want to add them in this PR, I think you may need to 
create a new class, `CoordinatorRuleManagerTest`, and expose the `rules` via a 
method annotated with `@VisibleForTesting` to verify that the map inside the 
`AtomicRefence` is immutable. Another option could be creating an issue for 
adding those tests and doing in a follow-up PR. 
   
   @zhenxiao @suneet-s What do you think?

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