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

    https://github.com/apache/flink/pull/934#discussion_r35635297
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/ExecutionGraph.java
 ---
    @@ -599,14 +694,18 @@ public ExecutionContext getExecutionContext() {
         * @return an Array containing the StringifiedAccumulatorResult objects
         */
        public StringifiedAccumulatorResult[] 
getAccumulatorResultsStringified() {
    +           Map<String, Accumulator<?, ?>> smallAccumulatorMap = 
aggregateSmallUserAccumulators();
    +           Map<String, List<BlobKey>> largeAccumulatorMap = 
aggregateLargeUserAccumulatorBlobKeys();
     
    -           Map<String, Accumulator<?, ?>> accumulatorMap = 
aggregateUserAccumulators();
    +           // get the total number of (unique) accumulators
    +           Set<String> uniqAccumulators = new HashSet<String>();
    --- End diff --
    
    unique


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