Github user mxm commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1236#discussion_r41617830
  
    --- Diff: 
flink-runtime/src/main/scala/org/apache/flink/runtime/jobmanager/JobManager.scala
 ---
    @@ -536,6 +536,11 @@ class JobManager(
             )
           )
     
    +    case RequestTaskManagerInstance(instanceID) =>
    +      sender ! decorateMessage(
    +        
TaskManagerInstance(instanceManager.getRegisteredInstanceById(instanceID))
    +      )
    +
    --- End diff --
    
    Wouldn't it be better to return an InstanceNotFound message instead of a 
null instance?


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