maytasm commented on a change in pull request #11601:
URL: https://github.com/apache/druid/pull/11601#discussion_r690361461



##########
File path: services/src/main/java/org/apache/druid/cli/CliCoordinator.java
##########
@@ -353,4 +370,76 @@ public static boolean isOverlord(Properties properties)
   {
     return Boolean.parseBoolean(properties.getProperty(AS_OVERLORD_PROPERTY));
   }
+
+  private static class CoordinatorCustomDutyGroupsProvider implements 
Provider<CoordinatorCustomDutyGroups>
+  {
+    private Properties props;
+    private JsonConfigurator configurator;
+    private ObjectMapper jsonMapper;
+
+    @Inject
+    public void inject(Properties props, JsonConfigurator configurator, 
ObjectMapper jsonMapper)
+    {
+      this.props = props;
+      this.configurator = configurator;
+      this.jsonMapper = jsonMapper;
+    }
+
+    @Override
+    public CoordinatorCustomDutyGroups get()

Review comment:
       There is no unit test since it is difficult to setup all the 
modules/injectors. However, this is test in the Integration test. The 
integration tests (`common-custom-coordinator-duties`) set the following 
config: 
   ```
   druid.coordinator.dutyGroups=["cleanupMetadata"]
   druid.coordinator.cleanupMetadata.duties=["killSupervisors"]
   druid.coordinator.cleanupMetadata.duty.killSupervisors.retainDuration=PT0M
   druid.coordinator.cleanupMetadata.period=PT10S
   ``` 
   and verify that the custom "killSupervisors" is created correctly and does 
its intended duty successfully. 




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