tillrohrmann commented on a change in pull request #9512: 
[FLINK-13819][coordination] Introduce State for RpcEndpoint
URL: https://github.com/apache/flink/pull/9512#discussion_r317620693
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/rpc/RpcEndpoint.java
 ##########
 @@ -323,6 +355,15 @@ public void validateRunsInMainThread() {
                assert 
MainThreadValidatorUtil.isRunningInExpectedThread(currentMainThread.get());
        }
 
+       /**
+        * Rpc endpoint's state.
+        */
+       public enum State {
 
 Review comment:
   If we only expose `isRunning`, then we could simplify the state machine to 
`boolean isRunning` which is set to `true` in `doStart` and to `false` in 
`doStop`.

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