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

    https://github.com/apache/flink/pull/5168#discussion_r157482818
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/dispatcher/Dispatcher.java 
---
    @@ -357,6 +362,28 @@ public void start() throws Exception {
                return 
CompletableFuture.completedFuture(jobManagerServices.blobServer.getPort());
        }
     
    +   @Override
    +   public CompletableFuture<Either<Throwable, 
SerializedJobExecutionResult>> getJobExecutionResult(
    --- End diff --
    
    I'm actually wondering why we are differentiating between execution success 
and failure that much. Also in the failure case we should have a net runtime 
and accumulator values. The only difference is that in the failure case we have 
an additional `SerializedThrowable`.
    
    We could for example have a common base class with a 
`JobExecutionResultSuccess` and `JobExecutionResultFailure` specialization 
(maybe also `JobExecutionResultCancelled` as a sub class of 
`JobExecutionResultFailure`). What do you think?


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