keith-turner commented on code in PR #5692:
URL: https://github.com/apache/accumulo/pull/5692#discussion_r2178395473


##########
minicluster/src/main/java/org/apache/accumulo/miniclusterImpl/MiniAccumuloClusterControl.java:
##########
@@ -213,16 +215,20 @@ public synchronized void start(ServerType server, 
Map<String,String> configOverr
           Map<String,Integer> compactorGroups =
               
cluster.getConfig().getClusterServerConfiguration().getCompactorConfiguration();
           for (Entry<String,Integer> e : compactorGroups.entrySet()) {
+            final String rg = e.getKey();

Review Comment:
   
   Could do something like the following in MiniAccumuloConfigImpl to support 
setting per RG.
   
   ```java
    // this function allows most existing code to stay the same.
     private final EnumMap<ServerType,Function<String, Class<?>>> 
serverTypeClasses;
     public MiniAccumuloConfigImpl setServerClass(ServerType type, Class<?> 
serverClass) {
       return setServerClass(type, resourceGroup -> serverClass);
     }
   
     public MiniAccumuloConfigImpl setServerClass(ServerType type, 
Function<String, Class<?>> serverClassfunction) {
       serverTypeClasses.put(type, Objects.requireNonNull(serverClassfunction));
       return this;
     }
   ```
   
   Then in a test class could do the followin.  Then its no longer hidden, 
someone looking at the test code can see what is happening.
   
   ```
   cfg.setServerClass(ServerType.COMPACTOR, rg->rg.equals("default") ? 
Compactor.class : ExternalDoNothingCompactor.class);
   ```
   
   



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