tillrohrmann commented on a change in pull request #9105: 
[FLINK-13241][Yarn/Mesos] Fix Yarn/MesosResourceManager setting managed memory 
size into wrong configuration instance.
URL: https://github.com/apache/flink/pull/9105#discussion_r306378649
 
 

 ##########
 File path: 
flink-yarn-tests/src/test/java/org/apache/flink/yarn/YarnConfigurationITCase.java
 ##########
 @@ -208,4 +215,12 @@ private boolean 
hasTaskManagerConnectedAndReportedSlots(Collection<TaskManagerIn
                        return taskManagerInfo.getNumberSlots() > 0;
                }
        }
+
+       private static int calculateManagedMemorySizeMB(Configuration 
originalConfiguration, int numSlotsPerTaskManager) {
+               Configuration configuration = new 
Configuration(originalConfiguration); // copy, because we alter the config
 
 Review comment:
   It is a bit weird that we have to do something like this in a test. This 
might indicate a design flaw of the 
`YarnResourceManager#updateTaskManagerConfigAndCreateWorkerSlotProfiles` method.

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